Merge pull request #16 from Secured-Finance/feat/blockchain

Implement blockchain for Dione, fix most consensus issues

.gitignore

@@ -25,3 +25,5 @@ eth-contracts/node_modules
 /.dione-config-4.toml
 .bootstrap_privkey
 eth-contracts/build
+.db
+eth-contracts/secrets.json

beacon/beacon.go

@@ -4,9 +4,6 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/Secured-Finance/dione/lib"
-	"github.com/sirupsen/logrus"
-
 	"github.com/Secured-Finance/dione/types"
 )
 
@@ -17,7 +14,7 @@ type BeaconResult struct {
 
 type BeaconNetworks []BeaconNetwork
 
-func (bn BeaconNetworks) BeaconNetworkForRound(e types.DrandRound) BeaconAPI {
+func (bn BeaconNetworks) BeaconNetworkForRound(e uint64) BeaconAPI {
 	for i := len(bn) - 1; i >= 0; i-- {
 		bp := bn[i]
 		if e >= bp.Start {
@@ -28,7 +25,7 @@ func (bn BeaconNetworks) BeaconNetworkForRound(e types.DrandRound) BeaconAPI {
 }
 
 type BeaconNetwork struct {
-	Start  types.DrandRound
+	Start  uint64
 	Beacon BeaconAPI
 }
 
@@ -37,111 +34,18 @@ type BeaconNetwork struct {
 // valid for a specific chain epoch. Also to verify beacon entries that have
 // been posted on chain.
 type BeaconAPI interface {
-	Entry(context.Context, uint64) <-chan BeaconResult
+	Entry(context.Context, uint64) (types.BeaconEntry, error)
 	VerifyEntry(types.BeaconEntry, types.BeaconEntry) error
 	LatestBeaconRound() uint64
 }
 
-func ValidateTaskBeacons(beaconNetworks BeaconNetworks, t *types.DioneTask, prevEpoch types.DrandRound, prevEntry types.BeaconEntry) error {
-	parentBeacon := beaconNetworks.BeaconNetworkForRound(prevEpoch)
-	currBeacon := beaconNetworks.BeaconNetworkForRound(t.DrandRound)
-	if parentBeacon != currBeacon {
-		if len(t.BeaconEntries) != 2 {
-			return fmt.Errorf("expected two beacon entries at beacon fork, got %d", len(t.BeaconEntries))
-		}
-		err := currBeacon.VerifyEntry(t.BeaconEntries[1], t.BeaconEntries[0])
-		if err != nil {
-			return fmt.Errorf("beacon at fork point invalid: (%v, %v): %w",
-				t.BeaconEntries[1], t.BeaconEntries[0], err)
-		}
-		return nil
-	}
+// ValidateBlockBeacons is a function that verifies block randomness
+func (bn BeaconNetworks) ValidateBlockBeacons(beaconNetworks BeaconNetworks, curEntry, prevEntry types.BeaconEntry) error {
+	defaultBeacon := beaconNetworks.BeaconNetworkForRound(0)
 
-	// TODO: fork logic
-	bNetwork := beaconNetworks.BeaconNetworkForRound(t.DrandRound)
-	if uint64(t.DrandRound) == prevEntry.Round {
-		if len(t.BeaconEntries) != 0 {
-			return fmt.Errorf("expected not to have any beacon entries in this task, got %d", len(t.BeaconEntries))
-		}
-		return nil
-	}
-
-	if len(t.BeaconEntries) == 0 {
-		return fmt.Errorf("expected to have beacon entries in this task, but didn't find any")
-	}
-
-	last := t.BeaconEntries[len(t.BeaconEntries)-1]
-	if last.Round != uint64(t.DrandRound) {
-		return fmt.Errorf("expected final beacon entry in task to be at round %d, got %d", uint64(t.DrandRound), last.Round)
-	}
-
-	for i, e := range t.BeaconEntries {
-		if err := bNetwork.VerifyEntry(e, prevEntry); err != nil {
-			return fmt.Errorf("beacon entry %d (%d - %x (%d)) was invalid: %w", i, e.Round, e.Data, len(e.Data), err)
-		}
-		prevEntry = e
+	if err := defaultBeacon.VerifyEntry(curEntry, prevEntry); err != nil {
+		return fmt.Errorf("beacon entry was invalid: %w", err)
 	}
 
 	return nil
 }
-
-func BeaconEntriesForTask(ctx context.Context, beaconNetworks BeaconNetworks) ([]types.BeaconEntry, error) {
-	beacon := beaconNetworks.BeaconNetworkForRound(0)
-	round := beacon.LatestBeaconRound()
-
-	//prevBeacon := beaconNetworks.BeaconNetworkForRound(prevRound)
-	//currBeacon := beaconNetworks.BeaconNetworkForRound(round)
-	//if prevBeacon != currBeacon {
-	//	// Fork logic
-	//	round := currBeacon.LatestBeaconRound()
-	//	out := make([]types.BeaconEntry, 2)
-	//	rch := currBeacon.Entry(ctx, round-1)
-	//	res := <-rch
-	//	if res.Err != nil {
-	//		return nil, fmt.Errorf("getting entry %d returned error: %w", round-1, res.Err)
-	//	}
-	//	out[0] = res.Entry
-	//	rch = currBeacon.Entry(ctx, round)
-	//	res = <-rch
-	//	if res.Err != nil {
-	//		return nil, fmt.Errorf("getting entry %d returned error: %w", round, res.Err)
-	//	}
-	//	out[1] = res.Entry
-	//	return out, nil
-	//}
-
-	start := lib.Clock.Now()
-
-	//if round == prev.Round {
-	//	return nil, nil
-	//}
-	//
-	//// TODO: this is a sketchy way to handle the genesis block not having a beacon entry
-	//if prev.Round == 0 {
-	//	prev.Round = round - 1
-	//}
-
-	out := make([]types.BeaconEntry, 2)
-	rch := beacon.Entry(ctx, round-1)
-	res := <-rch
-	if res.Err != nil {
-		return nil, fmt.Errorf("getting entry %d returned error: %w", round-1, res.Err)
-	}
-	out[0] = res.Entry
-	rch = beacon.Entry(ctx, round)
-	res = <-rch
-	if res.Err != nil {
-		return nil, fmt.Errorf("getting entry %d returned error: %w", round, res.Err)
-	}
-	out[1] = res.Entry
-
-	logrus.Debugf("fetching beacon entries: took %v, count of entries: %v", lib.Clock.Since(start), len(out))
-	//reverse(out)
-	return out, nil
-}
-
-func reverse(arr []types.BeaconEntry) {
-	for i := 0; i < len(arr)/2; i++ {
-		arr[i], arr[len(arr)-(1+i)] = arr[len(arr)-(1+i)], arr[i]
-	}
-}

beacon/domain_separation_tag.go

@@ -0,0 +1,8 @@
+package beacon
+
+// RandomnessType specifies a type of randomness.
+type RandomnessType int64
+
+const (
+	RandomnessTypeElectionProofProduction RandomnessType = 1 + iota
+)

beacon/drand/drand.go

@@ -5,7 +5,8 @@ import (
 	"context"
 	"fmt"
 	"sync"
-	"time"
+
+	"github.com/asaskevich/EventBus"
 
 	"github.com/Secured-Finance/dione/beacon"
 	"github.com/drand/drand/chain"
@@ -30,31 +31,17 @@ var log = logrus.WithFields(logrus.Fields{
 	"subsystem": "drand",
 })
 
-// DrandResponse structure representing response from drand network
-type DrandResponse struct {
-	// PreviousSig is the previous signature generated
-	PreviousSig []byte
-	// Round is the round number this beacon is tied to
-	Round uint64
-	// Signature is the BLS deterministic signature over Round || PreviousRand
-	Signature []byte
-	// Randomness for specific round generated by Drand
-	Randomness []byte
-}
-
 type DrandBeacon struct {
-	DrandClient      client.Client
-	PublicKey        kyber.Point
-	Interval         time.Duration
-	chainGenesisTime uint64
-	chainRoundTime   uint64
-
-	drandGenesisTime uint64
-	cacheLock        sync.Mutex
-	localCache       map[uint64]types.BeaconEntry
+	DrandClient        client.Client
+	PublicKey          kyber.Point
+	drandResultChannel <-chan client.Result
+	cacheLock          sync.Mutex
+	localCache         map[uint64]types.BeaconEntry
+	latestDrandRound   uint64
+	bus                EventBus.Bus
 }
 
-func NewDrandBeacon(genesisTs, interval uint64, ps *pubsub.PubSub) (*DrandBeacon, error) {
+func NewDrandBeacon(ps *pubsub.PubSub, bus EventBus.Bus) (*DrandBeacon, error) {
 	cfg := config.NewDrandConfig()
 
 	drandChain, err := chain.InfoFromJSON(bytes.NewReader([]byte(cfg.ChainInfo)))
@@ -95,46 +82,69 @@ func NewDrandBeacon(genesisTs, interval uint64, ps *pubsub.PubSub) (*DrandBeacon
 	db := &DrandBeacon{
 		DrandClient: drandClient,
 		localCache:  make(map[uint64]types.BeaconEntry),
+		bus:         bus,
+		PublicKey:   drandChain.PublicKey,
 	}
 
-	db.PublicKey = drandChain.PublicKey
-	db.Interval = drandChain.Period
-	db.drandGenesisTime = uint64(drandChain.GenesisTime)
-	db.chainRoundTime = interval
-	db.chainGenesisTime = genesisTs
-
 	return db, nil
 }
 
-func (db *DrandBeacon) Entry(ctx context.Context, round uint64) <-chan beacon.BeaconResult {
-	out := make(chan beacon.BeaconResult, 1)
+func (db *DrandBeacon) Run(ctx context.Context) error {
+	db.drandResultChannel = db.DrandClient.Watch(ctx)
+	err := db.getLatestDrandResult()
+	if err != nil {
+		return err
+	}
+	go db.loop(ctx)
+
+	return nil
+}
+
+func (db *DrandBeacon) getLatestDrandResult() error {
+	latestDround, err := db.DrandClient.Get(context.TODO(), 0)
+	if err != nil {
+		log.Errorf("failed to get latest drand round: %v", err)
+		return err
+	}
+	db.cacheValue(newBeaconEntryFromDrandResult(latestDround))
+	db.updateLatestDrandRound(latestDround.Round())
+	return nil
+}
+
+func (db *DrandBeacon) loop(ctx context.Context) {
+	for {
+		select {
+		case <-ctx.Done():
+			{
+				logrus.Debug("Stopping watching new DRAND entries...")
+				return
+			}
+		case res := <-db.drandResultChannel:
+			{
+				db.cacheValue(newBeaconEntryFromDrandResult(res))
+				db.updateLatestDrandRound(res.Round())
+				db.bus.Publish("beacon:newEntry", types.NewBeaconEntry(res.Round(), res.Randomness(), map[string]interface{}{"signature": res.Signature()}))
+			}
+		}
+	}
+}
+
+func (db *DrandBeacon) Entry(ctx context.Context, round uint64) (types.BeaconEntry, error) {
 	if round != 0 {
 		be := db.getCachedValue(round)
 		if be != nil {
-			out <- beacon.BeaconResult{Entry: *be}
-			close(out)
-			return out
+			return *be, nil
 		}
 	}
 
-	go func() {
-		start := lib.Clock.Now()
-		log.Infof("start fetching randomness: round %v", round)
-		resp, err := db.DrandClient.Get(ctx, round)
-
-		var br beacon.BeaconResult
-		if err != nil {
-			br.Err = fmt.Errorf("drand failed Get request: %w", err)
-		} else {
-			br.Entry.Round = resp.Round()
-			br.Entry.Data = resp.Signature()
-		}
-		log.Infof("done fetching randomness: round %v, took %v", round, lib.Clock.Since(start))
-		out <- br
-		close(out)
-	}()
-
-	return out
+	start := lib.Clock.Now()
+	log.Infof("start fetching randomness: round %v", round)
+	resp, err := db.DrandClient.Get(ctx, round)
+	if err != nil {
+		return types.BeaconEntry{}, fmt.Errorf("drand failed Get request: %w", err)
+	}
+	log.Infof("done fetching randomness: round %v, took %v", round, lib.Clock.Since(start))
+	return newBeaconEntryFromDrandResult(resp), nil
 }
 func (db *DrandBeacon) cacheValue(res types.BeaconEntry) {
 	db.cacheLock.Lock()
@@ -152,6 +162,12 @@ func (db *DrandBeacon) getCachedValue(round uint64) *types.BeaconEntry {
 	return &v
 }
 
+func (db *DrandBeacon) updateLatestDrandRound(round uint64) {
+	db.cacheLock.Lock()
+	defer db.cacheLock.Unlock()
+	db.latestDrandRound = round
+}
+
 func (db *DrandBeacon) VerifyEntry(curr, prev types.BeaconEntry) error {
 	if prev.Round == 0 {
 		return nil
@@ -160,23 +176,21 @@ func (db *DrandBeacon) VerifyEntry(curr, prev types.BeaconEntry) error {
 		return nil
 	}
 	b := &chain.Beacon{
-		PreviousSig: prev.Data,
+		PreviousSig: prev.Metadata["signature"].([]byte),
 		Round:       curr.Round,
-		Signature:   curr.Data,
+		Signature:   curr.Metadata["signature"].([]byte),
 	}
-	err := chain.VerifyBeacon(db.PublicKey, b)
-	if err == nil {
-		db.cacheValue(curr)
-	}
-	return err
+	return chain.VerifyBeacon(db.PublicKey, b)
 }
 
 func (db *DrandBeacon) LatestBeaconRound() uint64 {
-	latestDround, err := db.DrandClient.Get(context.TODO(), 0)
-	if err != nil {
-		log.Errorf("failed to get latest drand round: %w", err)
-	}
-	return latestDround.Round()
+	db.cacheLock.Lock()
+	defer db.cacheLock.Unlock()
+	return db.latestDrandRound
+}
+
+func newBeaconEntryFromDrandResult(res client.Result) types.BeaconEntry {
+	return types.NewBeaconEntry(res.Round(), res.Randomness(), map[string]interface{}{"signature": res.Signature()})
 }
 
 var _ beacon.BeaconAPI = (*DrandBeacon)(nil)

beacon/utils.go

@@ -0,0 +1,29 @@
+package beacon
+
+import (
+	"encoding/binary"
+
+	"github.com/minio/blake2b-simd"
+	"golang.org/x/xerrors"
+)
+
+func DrawRandomness(rbase []byte, randomnessType RandomnessType, round uint64, entropy []byte) ([]byte, error) {
+	h := blake2b.New256()
+	if err := binary.Write(h, binary.BigEndian, int64(randomnessType)); err != nil {
+		return nil, xerrors.Errorf("deriving randomness: %v", err)
+	}
+	VRFDigest := blake2b.Sum256(rbase)
+	_, err := h.Write(VRFDigest[:])
+	if err != nil {
+		return nil, xerrors.Errorf("hashing VRFDigest: %w", err)
+	}
+	if err := binary.Write(h, binary.BigEndian, round); err != nil {
+		return nil, xerrors.Errorf("deriving randomness: %v", err)
+	}
+	_, err = h.Write(entropy)
+	if err != nil {
+		return nil, xerrors.Errorf("hashing entropy: %v", err)
+	}
+
+	return h.Sum(nil), nil
+}

beacon/vrf.go

@@ -0,0 +1,28 @@
+package beacon
+
+import (
+	"fmt"
+
+	"github.com/libp2p/go-libp2p-core/crypto"
+	"github.com/libp2p/go-libp2p-core/peer"
+)
+
+func ComputeVRF(privKey crypto.PrivKey, sigInput []byte) ([]byte, error) {
+	return privKey.Sign(sigInput)
+}
+
+func VerifyVRF(worker peer.ID, vrfBase, vrfproof []byte) error {
+	pk, err := worker.ExtractPublicKey()
+	if err != nil {
+		return err
+	}
+	ok, err := pk.Verify(vrfBase, vrfproof)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return fmt.Errorf("vrf was invalid")
+	}
+
+	return nil
+}

blockchain/blockchain.go

@@ -0,0 +1,434 @@
+package blockchain
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"os"
+	"sync"
+
+	drand2 "github.com/Secured-Finance/dione/beacon/drand"
+
+	"github.com/Secured-Finance/dione/beacon"
+
+	"github.com/Secured-Finance/dione/consensus/validation"
+	"github.com/Secured-Finance/dione/types"
+	"github.com/sirupsen/logrus"
+	"github.com/wealdtech/go-merkletree"
+	"github.com/wealdtech/go-merkletree/keccak256"
+
+	"github.com/asaskevich/EventBus"
+
+	"github.com/Secured-Finance/dione/blockchain/utils"
+
+	types2 "github.com/Secured-Finance/dione/blockchain/types"
+	"github.com/fxamacker/cbor/v2"
+
+	"github.com/ledgerwatch/lmdb-go/lmdb"
+)
+
+const (
+	DefaultBlockDataPrefix   = "blockdata_"
+	DefaultBlockHeaderPrefix = "header_"
+	DefaultMetadataIndexName = "metadata"
+	LatestBlockHeightKey     = "latest_block_height"
+)
+
+var (
+	ErrBlockNotFound   = errors.New("block isn't found")
+	ErrLatestHeightNil = errors.New("latest block height is nil")
+)
+
+type BlockChain struct {
+	// db-related
+	dbEnv         *lmdb.Env
+	db            lmdb.DBI
+	metadataIndex *utils.Index
+	heightIndex   *utils.Index
+
+	bus         EventBus.Bus
+	miner       *Miner
+	drandBeacon *drand2.DrandBeacon
+}
+
+func NewBlockChain(path string, bus EventBus.Bus, miner *Miner, db *drand2.DrandBeacon) (*BlockChain, error) {
+	chain := &BlockChain{
+		bus:         bus,
+		miner:       miner,
+		drandBeacon: db,
+	}
+
+	// configure lmdb env
+	env, err := lmdb.NewEnv()
+	if err != nil {
+		return nil, err
+	}
+
+	err = env.SetMaxDBs(1)
+	if err != nil {
+		return nil, err
+	}
+	err = env.SetMapSize(100 * 1024 * 1024 * 1024) // 100 GB
+	if err != nil {
+		return nil, err
+	}
+
+	err = os.MkdirAll(path, 0755)
+	if err != nil {
+		return nil, err
+	}
+
+	err = env.Open(path, 0, 0755)
+	if err != nil {
+		return nil, err
+	}
+
+	chain.dbEnv = env
+
+	var dbi lmdb.DBI
+	err = env.Update(func(txn *lmdb.Txn) error {
+		dbi, err = txn.OpenDBI("blocks", lmdb.Create)
+		return err
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	chain.db = dbi
+
+	// create index instances
+	metadataIndex := utils.NewIndex(DefaultMetadataIndexName, env, dbi)
+	heightIndex := utils.NewIndex("height", env, dbi)
+	chain.metadataIndex = metadataIndex
+	chain.heightIndex = heightIndex
+
+	return chain, nil
+}
+
+func (bc *BlockChain) setLatestBlockHeight(height uint64) error {
+	err := bc.metadataIndex.PutUint64([]byte(LatestBlockHeightKey), height)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (bc *BlockChain) GetLatestBlockHeight() (uint64, error) {
+	height, err := bc.metadataIndex.GetUint64([]byte(LatestBlockHeightKey))
+	if err != nil {
+		if err == utils.ErrIndexKeyNotFound {
+			return 0, ErrLatestHeightNil
+		}
+		return 0, err
+	}
+	return height, nil
+}
+
+func (bc *BlockChain) StoreBlock(block *types2.Block) error {
+	if exists, err := bc.HasBlock(block.Header.Hash); err != nil {
+		return err
+	} else if exists {
+		//return fmt.Errorf("block already exists in blockchain")
+		return nil
+	}
+
+	if block.Header.Height != 0 {
+		err := bc.ValidateBlock(block)
+		if err != nil {
+			return fmt.Errorf("failed to store block: %w", err)
+		}
+	}
+
+	err := bc.dbEnv.Update(func(txn *lmdb.Txn) error {
+		data, err := cbor.Marshal(block.Data)
+		if err != nil {
+			return err
+		}
+		headerData, err := cbor.Marshal(block.Header)
+		if err != nil {
+			return err
+		}
+		blockHash := hex.EncodeToString(block.Header.Hash)
+		err = txn.Put(bc.db, []byte(DefaultBlockDataPrefix+blockHash), data, 0)
+		if err != nil {
+			return err
+		}
+		err = txn.Put(bc.db, []byte(DefaultBlockHeaderPrefix+blockHash), headerData, 0) // store header separately for easy fetching
+		return err
+	})
+	if err != nil {
+		return err
+	}
+
+	// update index "height -> block hash"
+	heightBytes := make([]byte, 8)
+	binary.LittleEndian.PutUint64(heightBytes, block.Header.Height)
+	err = bc.heightIndex.PutBytes(heightBytes, block.Header.Hash)
+	if err != nil {
+		return err
+	}
+
+	// update latest block height
+	height, err := bc.GetLatestBlockHeight()
+	if err != nil && err != ErrLatestHeightNil {
+		return err
+	}
+
+	if err == ErrLatestHeightNil || block.Header.Height > height {
+		if err = bc.setLatestBlockHeight(block.Header.Height); err != nil {
+			return err
+		}
+		bc.bus.Publish("blockchain:latestBlockHeightUpdated", block)
+	}
+	bc.bus.Publish("blockchain:blockCommitted", block)
+	return nil
+}
+
+func (bc *BlockChain) HasBlock(blockHash []byte) (bool, error) {
+	var blockExists bool
+	err := bc.dbEnv.View(func(txn *lmdb.Txn) error {
+		h := hex.EncodeToString(blockHash)
+		_, err := txn.Get(bc.db, []byte(DefaultBlockHeaderPrefix+h)) // try to fetch block header
+		if err != nil {
+			if lmdb.IsNotFound(err) {
+				blockExists = false
+				return nil
+			}
+			return err
+		}
+		blockExists = true
+		return nil
+	})
+	if err != nil {
+		return false, err
+	}
+	return blockExists, nil
+}
+
+func (bc *BlockChain) FetchBlockData(blockHash []byte) ([]*types2.Transaction, error) {
+	var data []*types2.Transaction
+	err := bc.dbEnv.View(func(txn *lmdb.Txn) error {
+		h := hex.EncodeToString(blockHash)
+		blockData, err := txn.Get(bc.db, []byte(DefaultBlockDataPrefix+h))
+		if err != nil {
+			if lmdb.IsNotFound(err) {
+				return ErrBlockNotFound
+			}
+			return err
+		}
+		err = cbor.Unmarshal(blockData, &data)
+		return err
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return data, nil
+}
+
+func (bc *BlockChain) FetchBlockHeader(blockHash []byte) (*types2.BlockHeader, error) {
+	var blockHeader types2.BlockHeader
+	err := bc.dbEnv.View(func(txn *lmdb.Txn) error {
+		h := hex.EncodeToString(blockHash)
+		data, err := txn.Get(bc.db, []byte(DefaultBlockHeaderPrefix+h))
+		if err != nil {
+			if lmdb.IsNotFound(err) {
+				return ErrBlockNotFound
+			}
+			return err
+		}
+		err = cbor.Unmarshal(data, &blockHeader)
+		return err
+	})
+	if err != nil {
+		return nil, err
+	}
+	return &blockHeader, nil
+}
+
+func (bc *BlockChain) FetchBlock(blockHash []byte) (*types2.Block, error) {
+	var block types2.Block
+	header, err := bc.FetchBlockHeader(blockHash)
+	if err != nil {
+		return nil, err
+	}
+	block.Header = header
+
+	data, err := bc.FetchBlockData(blockHash)
+	if err != nil {
+		return nil, err
+	}
+	block.Data = data
+
+	return &block, nil
+}
+
+func (bc *BlockChain) FetchBlockByHeight(height uint64) (*types2.Block, error) {
+	var heightBytes = make([]byte, 8)
+	binary.LittleEndian.PutUint64(heightBytes, height)
+	blockHash, err := bc.heightIndex.GetBytes(heightBytes)
+	if err != nil {
+		if err == utils.ErrIndexKeyNotFound {
+			return nil, ErrBlockNotFound
+		}
+	}
+	block, err := bc.FetchBlock(blockHash)
+	if err != nil {
+		return nil, err
+	}
+	return block, nil
+}
+
+func (bc *BlockChain) FetchBlockHeaderByHeight(height uint64) (*types2.BlockHeader, error) {
+	var heightBytes = make([]byte, 8)
+	binary.LittleEndian.PutUint64(heightBytes, height)
+	blockHash, err := bc.heightIndex.GetBytes(heightBytes)
+	if err != nil {
+		if err == utils.ErrIndexKeyNotFound {
+			return nil, ErrBlockNotFound
+		}
+	}
+	blockHeader, err := bc.FetchBlockHeader(blockHash)
+	if err != nil {
+		return nil, err
+	}
+	return blockHeader, nil
+}
+
+func (bc *BlockChain) ValidateBlock(block *types2.Block) error {
+	// === verify block signature ===
+	pubkey, err := block.Header.Proposer.ExtractPublicKey()
+	if err != nil {
+		return fmt.Errorf("unable to extract public key from block proposer's peer id: %w", err)
+	}
+
+	ok, err := pubkey.Verify(block.Header.Hash, block.Header.Signature)
+	if err != nil {
+		return fmt.Errorf("failed to verify block signature: %w", err)
+	}
+	if !ok {
+		return fmt.Errorf("signature of block %x is invalid", block.Header.Hash)
+	}
+	/////////////////////////////////
+
+	// === check last hash merkle proof ===
+	latestHeight, err := bc.GetLatestBlockHeight()
+	if err != nil {
+		return err
+	}
+	previousBlockHeader, err := bc.FetchBlockHeaderByHeight(latestHeight)
+	if err != nil {
+		return err
+	}
+	if !bytes.Equal(block.Header.LastHash, previousBlockHeader.Hash) {
+		return fmt.Errorf("block header has invalid last block hash (expected: %x, actual %x)", previousBlockHeader.Hash, block.Header.LastHash)
+	}
+
+	verified, err := merkletree.VerifyProofUsing(previousBlockHeader.Hash, true, block.Header.LastHashProof, [][]byte{block.Header.Hash}, keccak256.New())
+	if err != nil {
+		return fmt.Errorf("failed to verify last block hash merkle proof: %w", err)
+	}
+	if !verified {
+		return fmt.Errorf("merkle hash of block doesn't contain hash of previous block")
+	}
+	/////////////////////////////////
+
+	// === verify election proof wincount preliminarily ===
+	if block.Header.ElectionProof.WinCount < 1 {
+		return fmt.Errorf("block proposer %s is not a winner", block.Header.Proposer.String())
+	}
+	/////////////////////////////////
+
+	// === verify miner's eligibility to propose this task ===
+	err = bc.miner.IsMinerEligibleToProposeBlock(block.Header.ProposerEth)
+	if err != nil {
+		return fmt.Errorf("block proposer is not eligible to propose block: %w", err)
+	}
+	/////////////////////////////////
+
+	// === verify election proof vrf ===
+	proposerBuf, err := block.Header.Proposer.MarshalBinary()
+	if err != nil {
+		return err
+	}
+
+	res, err := bc.drandBeacon.Entry(context.TODO(), block.Header.ElectionProof.RandomnessRound)
+	if err != nil {
+		return err
+	}
+	eproofRandomness, err := beacon.DrawRandomness(
+		res.Data,
+		beacon.RandomnessTypeElectionProofProduction,
+		block.Header.Height,
+		proposerBuf,
+	)
+	if err != nil {
+		return fmt.Errorf("failed to draw ElectionProof randomness: %w", err)
+	}
+
+	err = beacon.VerifyVRF(*block.Header.Proposer, eproofRandomness, block.Header.ElectionProof.VRFProof)
+	if err != nil {
+		return fmt.Errorf("failed to verify election proof vrf: %w", err)
+	}
+	//////////////////////////////////////
+
+	// === compute wincount locally and verify values ===
+	mStake, nStake, err := bc.miner.GetStakeInfo(block.Header.ProposerEth)
+	if err != nil {
+		return fmt.Errorf("failed to get miner stake: %w", err)
+	}
+
+	actualWinCount := block.Header.ElectionProof.ComputeWinCount(mStake, nStake)
+	if block.Header.ElectionProof.WinCount != actualWinCount {
+		return fmt.Errorf("locally computed wincount of block is not matching to the received value")
+	}
+	//////////////////////////////////////
+
+	// === validate block transactions ===
+	result := make(chan error)
+	var wg sync.WaitGroup
+	for _, v := range block.Data {
+		wg.Add(1)
+		go func(v *types2.Transaction, c chan error) {
+			defer wg.Done()
+			if err := utils.VerifyTx(block.Header, v); err != nil {
+				c <- fmt.Errorf("failed to verify tx: %w", err)
+				return
+			}
+
+			var task types.DioneTask
+			err = cbor.Unmarshal(v.Data, &task)
+			if err != nil {
+				c <- fmt.Errorf("failed to unmarshal transaction payload: %w", err)
+				return
+			}
+
+			if validationFunc := validation.GetValidationMethod(task.OriginChain, task.RequestType); validationFunc != nil {
+				if err := validationFunc(&task); err != nil {
+					c <- fmt.Errorf("payload validation has been failed: %w", err)
+					return
+				}
+			} else {
+				logrus.WithFields(logrus.Fields{
+					"originChain": task.OriginChain,
+					"requestType": task.RequestType,
+				}).Debug("This origin chain/request type doesn't have any payload validation!")
+			}
+		}(v, result)
+	}
+	go func() {
+		wg.Wait()
+		close(result)
+	}()
+	for err := range result {
+		if err != nil {
+			return err
+		}
+	}
+	/////////////////////////////////
+
+	return nil
+}

blockchain/miner.go

@@ -0,0 +1,199 @@
+package blockchain
+
+import (
+	"errors"
+	"fmt"
+	"math/big"
+
+	"github.com/libp2p/go-libp2p-core/host"
+
+	"github.com/asaskevich/EventBus"
+
+	"github.com/Secured-Finance/dione/beacon"
+	"github.com/Secured-Finance/dione/types"
+
+	"github.com/Secured-Finance/dione/blockchain/pool"
+
+	"github.com/libp2p/go-libp2p-core/crypto"
+
+	types2 "github.com/Secured-Finance/dione/blockchain/types"
+
+	"github.com/libp2p/go-libp2p-core/peer"
+
+	"github.com/Secured-Finance/dione/ethclient"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	ErrNoTxForBlock = fmt.Errorf("no transactions for including into block")
+)
+
+type Miner struct {
+	bus               EventBus.Bus
+	address           peer.ID
+	ethClient         *ethclient.EthereumClient
+	minerStake        *big.Int
+	networkStake      *big.Int
+	privateKey        crypto.PrivKey
+	mempool           *pool.Mempool
+	latestBlockHeader *types2.BlockHeader
+	blockchain        *BlockChain
+}
+
+func NewMiner(
+	h host.Host,
+	ethClient *ethclient.EthereumClient,
+	privateKey crypto.PrivKey,
+	mempool *pool.Mempool,
+	bus EventBus.Bus,
+) *Miner {
+	m := &Miner{
+		address:    h.ID(),
+		ethClient:  ethClient,
+		privateKey: privateKey,
+		mempool:    mempool,
+		bus:        bus,
+	}
+
+	return m
+}
+
+func (m *Miner) SetBlockchainInstance(b *BlockChain) {
+	m.blockchain = b
+
+	m.bus.SubscribeAsync("blockchain:latestBlockHeightUpdated", func(block *types2.Block) {
+		m.latestBlockHeader = block.Header
+	}, true)
+
+	height, _ := m.blockchain.GetLatestBlockHeight()
+	header, err := m.blockchain.FetchBlockHeaderByHeight(height)
+	if err != nil {
+		logrus.WithField("err", err.Error()).Fatal("Failed to initialize miner subsystem")
+	}
+	m.latestBlockHeader = header
+
+	logrus.Info("Mining subsystem has been initialized!")
+}
+
+func (m *Miner) UpdateCurrentStakeInfo() error {
+	mStake, err := m.ethClient.GetMinerStake(*m.ethClient.GetEthAddress())
+
+	if err != nil {
+		logrus.Warn("Can't get miner stake", err)
+		return err
+	}
+
+	nStake, err := m.ethClient.GetTotalStake()
+
+	if err != nil {
+		logrus.Warn("Can't get miner stake", err)
+		return err
+	}
+
+	m.minerStake = mStake
+	m.networkStake = nStake
+
+	return nil
+}
+
+func (m *Miner) GetStakeInfo(miner common.Address) (*big.Int, *big.Int, error) {
+	mStake, err := m.ethClient.GetMinerStake(miner)
+
+	if err != nil {
+		logrus.Warn("Can't get miner stake", err)
+		return nil, nil, err
+	}
+
+	nStake, err := m.ethClient.GetTotalStake()
+
+	if err != nil {
+		logrus.Warn("Can't get miner stake", err)
+		return nil, nil, err
+	}
+
+	return mStake, nStake, nil
+}
+
+func (m *Miner) MineBlock(randomness []byte, randomnessRound uint64) (*types2.Block, error) {
+	if m.latestBlockHeader == nil {
+		return nil, fmt.Errorf("latest block header is null")
+	}
+
+	logrus.WithField("height", m.latestBlockHeader.Height+1).Debug("Trying to mine new block...")
+
+	if err := m.UpdateCurrentStakeInfo(); err != nil {
+		return nil, fmt.Errorf("failed to update miner stake: %w", err)
+	}
+
+	winner, err := isRoundWinner(
+		m.latestBlockHeader.Height+1,
+		m.address,
+		randomness,
+		randomnessRound,
+		m.minerStake,
+		m.networkStake,
+		m.privateKey,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("failed to check if we winned in next round: %w", err)
+	}
+
+	if winner == nil {
+		logrus.WithField("height", m.latestBlockHeader.Height+1).Debug("Block is not mined because we are not leader in consensus round")
+		return nil, nil
+	}
+
+	logrus.WithField("height", m.latestBlockHeader.Height+1).Infof("We have been elected in the current consensus round")
+
+	txs := m.mempool.GetTransactionsForNewBlock()
+	if txs == nil {
+		return nil, ErrNoTxForBlock // skip new consensus round because there is no transaction for processing
+	}
+
+	newBlock, err := types2.CreateBlock(m.latestBlockHeader, txs, *m.ethClient.GetEthAddress(), m.privateKey, winner)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create new block: %w", err)
+	}
+
+	return newBlock, nil
+}
+
+func (m *Miner) IsMinerEligibleToProposeBlock(ethAddress common.Address) error {
+	mStake, err := m.ethClient.GetMinerStake(ethAddress)
+	if err != nil {
+		return err
+	}
+	if mStake.Cmp(big.NewInt(ethclient.MinMinerStake)) == -1 {
+		return errors.New("miner doesn't have enough staked tokens")
+	}
+	return nil
+}
+
+func isRoundWinner(round uint64,
+	worker peer.ID, randomness []byte, randomnessRound uint64, minerStake, networkStake *big.Int, privKey crypto.PrivKey) (*types.ElectionProof, error) {
+
+	buf, err := worker.MarshalBinary()
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal address: %w", err)
+	}
+
+	electionRand, err := beacon.DrawRandomness(randomness, beacon.RandomnessTypeElectionProofProduction, round, buf)
+	if err != nil {
+		return nil, fmt.Errorf("failed to draw randomness: %w", err)
+	}
+
+	vrfout, err := beacon.ComputeVRF(privKey, electionRand)
+	if err != nil {
+		return nil, fmt.Errorf("failed to compute VRF: %w", err)
+	}
+
+	ep := &types.ElectionProof{VRFProof: vrfout, RandomnessRound: randomnessRound}
+	j := ep.ComputeWinCount(minerStake, networkStake)
+	ep.WinCount = j
+	if j < 1 {
+		return nil, nil
+	}
+
+	return ep, nil
+}

blockchain/pool/mempool.go

@@ -0,0 +1,107 @@
+package pool
+
+import (
+	"encoding/hex"
+	"errors"
+	"sort"
+	"time"
+
+	"github.com/asaskevich/EventBus"
+
+	"github.com/sirupsen/logrus"
+
+	types2 "github.com/Secured-Finance/dione/blockchain/types"
+
+	"github.com/Secured-Finance/dione/consensus/policy"
+
+	"github.com/Secured-Finance/dione/cache"
+)
+
+const (
+	DefaultTxTTL    = 10 * time.Minute
+	DefaultTxPrefix = "tx_"
+)
+
+var (
+	ErrTxNotFound = errors.New("tx isn't found in mempool")
+)
+
+type Mempool struct {
+	cache cache.Cache
+	bus   EventBus.Bus
+}
+
+func NewMempool(bus EventBus.Bus) (*Mempool, error) {
+	mp := &Mempool{
+		cache: cache.NewInMemoryCache(), // here we need to use separate cache
+		bus:   bus,
+	}
+
+	return mp, nil
+}
+
+func (mp *Mempool) StoreTx(tx *types2.Transaction) error {
+	hashStr := hex.EncodeToString(tx.Hash)
+	err := mp.cache.StoreWithTTL(DefaultTxPrefix+hashStr, tx, DefaultTxTTL)
+	logrus.WithField("txHash", hex.EncodeToString(tx.Hash)).Info("Submitted new transaction in mempool")
+	mp.bus.Publish("mempool:transactionAdded", tx)
+	return err
+}
+
+func (mp *Mempool) DeleteTx(txHash []byte) error {
+	hashStr := hex.EncodeToString(txHash)
+	var tx types2.Transaction
+	err := mp.cache.Get(DefaultTxPrefix+hashStr, &tx)
+	if err != nil {
+		return err
+	}
+	mp.cache.Delete(DefaultTxPrefix + hashStr)
+	logrus.WithField("txHash", hex.EncodeToString(txHash)).Debugf("Deleted transaction from mempool")
+	mp.bus.Publish("mempool:transactionRemoved", tx)
+	return nil
+}
+
+func (mp *Mempool) GetTransactionsForNewBlock() []*types2.Transaction {
+	var txForBlock []*types2.Transaction
+	allTxs := mp.GetAllTransactions()
+	sort.Slice(allTxs, func(i, j int) bool {
+		return allTxs[i].Timestamp.Before(allTxs[j].Timestamp)
+	})
+
+	for i := 0; i < policy.BlockMaxTransactionCount; i++ {
+		if len(allTxs) == 0 {
+			break
+		}
+		tx := allTxs[0]     // get oldest tx
+		allTxs = allTxs[1:] // pop tx
+		txForBlock = append(txForBlock, tx)
+	}
+
+	return txForBlock
+}
+
+func (mp *Mempool) GetAllTransactions() []*types2.Transaction {
+	var allTxs []*types2.Transaction
+
+	for _, v := range mp.cache.Items() {
+		tx := v.(*types2.Transaction)
+		allTxs = append(allTxs, tx)
+	}
+	return allTxs
+}
+
+func (mp *Mempool) GetTransaction(hash []byte) (*types2.Transaction, error) {
+	hashStr := hex.EncodeToString(hash)
+	var tx types2.Transaction
+	err := mp.cache.Get(DefaultTxPrefix+hashStr, &tx)
+
+	if err != nil {
+		if errors.Is(err, cache.ErrNotFound) {
+			return nil, ErrTxNotFound
+		} else {
+			return nil, err
+		}
+	}
+
+	return &tx, nil
+}

blockchain/sync/sync_mgr.go

@@ -0,0 +1,278 @@
+package sync
+
+import (
+	"bytes"
+	"context"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"strings"
+	"sync"
+
+	"github.com/fxamacker/cbor/v2"
+
+	"github.com/asaskevich/EventBus"
+
+	"github.com/Secured-Finance/dione/blockchain/utils"
+
+	"github.com/Secured-Finance/dione/blockchain"
+
+	"github.com/Secured-Finance/dione/pubsub"
+
+	"github.com/Secured-Finance/dione/consensus/policy"
+
+	"github.com/wealdtech/go-merkletree/keccak256"
+
+	"github.com/wealdtech/go-merkletree"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/Secured-Finance/dione/node/wire"
+
+	"github.com/libp2p/go-libp2p-core/peer"
+
+	types2 "github.com/Secured-Finance/dione/blockchain/types"
+
+	"github.com/Secured-Finance/dione/blockchain/pool"
+	gorpc "github.com/libp2p/go-libp2p-gorpc"
+)
+
+type SyncManager interface {
+	Run()
+}
+
+type syncManager struct {
+	blockpool            *blockchain.BlockChain
+	mempool              *pool.Mempool
+	wg                   sync.WaitGroup
+	ctx                  context.Context
+	ctxCancelFunc        context.CancelFunc
+	initialSyncCompleted bool
+	bootstrapPeer        peer.ID
+	rpcClient            *gorpc.Client
+	psb                  *pubsub.PubSubRouter
+	bus                  EventBus.Bus
+}
+
+func NewSyncManager(bus EventBus.Bus, bc *blockchain.BlockChain, mp *pool.Mempool, p2pRPCClient *gorpc.Client, bootstrapPeer peer.ID, psb *pubsub.PubSubRouter) SyncManager {
+	ctx, cancelFunc := context.WithCancel(context.Background())
+	sm := &syncManager{
+		bus:                  bus,
+		blockpool:            bc,
+		mempool:              mp,
+		ctx:                  ctx,
+		ctxCancelFunc:        cancelFunc,
+		initialSyncCompleted: false,
+		bootstrapPeer:        bootstrapPeer,
+		rpcClient:            p2pRPCClient,
+		psb:                  psb,
+	}
+
+	return sm
+}
+
+func (sm *syncManager) Run() {
+	sm.psb.Hook(pubsub.NewTxMessageType, sm.onNewTransaction)
+	sm.psb.Hook(pubsub.NewBlockMessageType, sm.onNewBlock)
+
+	go func() {
+		if err := sm.initialSync(); err != nil {
+			logrus.Error(err)
+		}
+	}()
+}
+
+func (sm *syncManager) initialSync() error {
+	if err := sm.doInitialBlockPoolSync(); err != nil {
+		return err
+	}
+	if err := sm.doInitialMempoolSync(); err != nil {
+		return err
+	}
+	sm.bus.Publish("sync:initialSyncCompleted")
+	return nil
+}
+
+func (sm *syncManager) doInitialBlockPoolSync() error {
+	if sm.initialSyncCompleted {
+		return nil
+	}
+
+	ourLastHeight, _ := sm.blockpool.GetLatestBlockHeight()
+
+	if sm.bootstrapPeer == "" {
+		return nil // FIXME
+	}
+
+	var reply wire.LastBlockHeightReply
+	err := sm.rpcClient.Call(sm.bootstrapPeer, "NetworkService", "LastBlockHeight", nil, &reply)
+	if err != nil {
+		return err
+	}
+
+	if reply.Height > ourLastHeight {
+		heightCount := reply.Height - ourLastHeight
+		var from uint64
+		to := ourLastHeight
+		var receivedBlocks []types2.Block
+		for heightCount > 0 {
+			from = to + 1
+			var addedVal uint64
+			if heightCount < policy.MaxBlockCountForRetrieving {
+				addedVal = heightCount
+			} else {
+				addedVal = policy.MaxBlockCountForRetrieving
+			}
+			heightCount -= addedVal
+			to += addedVal
+			var getBlocksReply wire.GetRangeOfBlocksReply
+			arg := wire.GetRangeOfBlocksArg{From: from, To: to}
+			err = sm.rpcClient.Call(sm.bootstrapPeer, "NetworkService", "GetRangeOfBlocks", arg, &getBlocksReply)
+			if err != nil {
+				return err
+			}
+			receivedBlocks = append(receivedBlocks, getBlocksReply.Blocks...)
+			if len(getBlocksReply.FailedBlockHeights) != 0 {
+				logrus.Warnf("remote node is unable to retrieve block heights: %s", strings.Trim(strings.Join(strings.Fields(fmt.Sprint(getBlocksReply.FailedBlockHeights)), ", "), "[]"))
+				// FIXME we definitely need to handle it, because in that case our chain isn't complete!
+			}
+		}
+		for _, b := range receivedBlocks {
+			err := sm.processReceivedBlock(b) // it should process the block synchronously
+			if err != nil {
+				logrus.Warnf("unable to process block %d: %s", b.Header.Height, err.Error())
+				continue
+			}
+		}
+	} else {
+		// FIXME probably we need to pick up better peer for syncing, because chain of current peer can be out-of-date as well
+	}
+
+	return nil
+}
+
+func (sm *syncManager) doInitialMempoolSync() error {
+	if sm.bootstrapPeer == "" {
+		return nil // FIXME
+	}
+
+	var reply wire.InvMessage
+	err := sm.rpcClient.Call(sm.bootstrapPeer, "NetworkService", "Mempool", nil, &reply)
+	if err != nil {
+		return err
+	}
+
+	var txsToRetrieve [][]byte
+
+	for _, v := range reply.Inventory {
+		_, err = sm.mempool.GetTransaction(v.Hash)
+		if errors.Is(err, pool.ErrTxNotFound) {
+			txsToRetrieve = append(txsToRetrieve, v.Hash)
+		}
+	}
+
+	for {
+		var txHashes [][]byte
+
+		if len(txsToRetrieve) == 0 {
+			break
+		}
+
+		if len(txsToRetrieve) > policy.MaxTransactionCountForRetrieving {
+			txHashes = txsToRetrieve[:policy.MaxTransactionCountForRetrieving]
+			txsToRetrieve = txsToRetrieve[policy.MaxTransactionCountForRetrieving:]
+		} else {
+			txHashes = txsToRetrieve
+			txsToRetrieve = nil
+		}
+
+		getMempoolTxArg := wire.GetMempoolTxsArg{
+			Items: txHashes,
+		}
+		var getMempoolTxReply wire.GetMempoolTxsReply
+		err := sm.rpcClient.Call(sm.bootstrapPeer, "NetworkService", "GetMempoolTxs", getMempoolTxArg, &getMempoolTxReply)
+		if err != nil {
+			return err
+		}
+		for _, v := range getMempoolTxReply.Transactions {
+			err := sm.mempool.StoreTx(&v)
+			if err != nil {
+				logrus.Warnf(err.Error())
+			}
+		}
+		// TODO handle not found transactions
+	}
+
+	return nil
+}
+
+func (sm *syncManager) processReceivedBlock(block types2.Block) error {
+	// validate block
+	previousBlockHeader, err := sm.blockpool.FetchBlockHeaderByHeight(block.Header.Height - 1)
+	if err != nil {
+		return fmt.Errorf("failed to retrieve previous block %d", block.Header.Height-1)
+	}
+	if bytes.Compare(block.Header.LastHash, previousBlockHeader.Hash) != 0 {
+		return fmt.Errorf("block header has invalid last block hash")
+	}
+	verified, err := merkletree.VerifyProofUsing(previousBlockHeader.Hash, false, block.Header.LastHashProof, [][]byte{block.Header.Hash}, keccak256.New())
+	if err != nil {
+		return fmt.Errorf("failed to verify last block hash merkle proof: %w", err)
+	}
+	if !verified {
+		return fmt.Errorf("merkle hash of current block doesn't contain hash of previous block")
+	}
+
+	// check if hashes of block transactions are present in the block hash merkle tree
+	for _, tx := range block.Data { // FIXME we need to do something with rejected txs
+		if err := utils.VerifyTx(block.Header, tx); err != nil {
+			return err
+		}
+	}
+
+	err = sm.blockpool.StoreBlock(&block)
+	if err != nil {
+		return fmt.Errorf("failed to store block in blockpool: %s", err.Error())
+	}
+
+	return nil
+}
+
+func (sm *syncManager) onNewTransaction(message *pubsub.PubSubMessage) {
+	var tx types2.Transaction
+	err := cbor.Unmarshal(message.Payload, &tx)
+	if err != nil {
+		logrus.Errorf("failed to convert payload to transaction: %s", err.Error())
+		return
+	}
+
+	// TODO add more checks on tx
+	if !tx.ValidateHash() {
+		logrus.WithField("txHash", hex.EncodeToString(tx.Hash)).Warn("failed to validate transaction hash, rejecting it")
+		return
+	}
+
+	err = sm.mempool.StoreTx(&tx)
+	if err != nil {
+		logrus.Warnf("failed to store incoming transaction in mempool: %s", err.Error())
+	}
+}
+
+func (sm *syncManager) onNewBlock(message *pubsub.PubSubMessage) {
+	var block types2.Block
+
+	err := cbor.Unmarshal(message.Payload, &block)
+	if err != nil {
+		logrus.WithField("err", err.Error()).Error("failed to unmarshal payload of NewBlock message")
+		return
+	}
+
+	err = sm.blockpool.StoreBlock(&block)
+	if err != nil {
+		logrus.WithFields(logrus.Fields{
+			"err":       err.Error(),
+			"blockHash": fmt.Sprintf("%x", block.Header.Hash),
+		}).Error("failed to store block from NewBlock message")
+		return
+	}
+}

blockchain/types/block.go

@@ -0,0 +1,109 @@
+package types
+
+import (
+	"encoding/binary"
+	"time"
+
+	"github.com/Secured-Finance/dione/types"
+
+	"github.com/libp2p/go-libp2p-core/crypto"
+
+	"github.com/ethereum/go-ethereum/common"
+
+	"github.com/wealdtech/go-merkletree"
+	"github.com/wealdtech/go-merkletree/keccak256"
+
+	"github.com/libp2p/go-libp2p-core/peer"
+)
+
+type Block struct {
+	Header *BlockHeader
+	Data   []*Transaction
+}
+
+type BlockHeader struct {
+	Timestamp     int64
+	Height        uint64
+	Hash          []byte
+	LastHash      []byte
+	LastHashProof *merkletree.Proof
+	Proposer      *peer.ID
+	ProposerEth   common.Address
+	Signature     []byte
+	BeaconEntry   types.BeaconEntry
+	ElectionProof *types.ElectionProof
+}
+
+func GenesisBlock() *Block {
+	return &Block{
+		Header: &BlockHeader{
+			Timestamp: 1620845070,
+			Height:    0,
+			Hash:      []byte("DIMICANDUM"),
+		},
+		Data: []*Transaction{},
+	}
+}
+
+func CreateBlock(lastBlockHeader *BlockHeader, txs []*Transaction, minerEth common.Address, privateKey crypto.PrivKey, eproof *types.ElectionProof) (*Block, error) {
+	timestamp := time.Now().UnixNano()
+
+	// extract hashes from transactions
+	var merkleHashes [][]byte
+	for _, tx := range txs {
+		merkleHashes = append(merkleHashes, tx.Hash)
+	}
+	merkleHashes = append(merkleHashes, lastBlockHeader.Hash)
+	timestampBytes := make([]byte, 8)
+	binary.LittleEndian.PutUint64(timestampBytes, uint64(timestamp))
+	merkleHashes = append(merkleHashes, timestampBytes)
+
+	tree, err := merkletree.NewUsing(merkleHashes, keccak256.New(), true)
+	if err != nil {
+		return nil, err
+	}
+
+	// fetch merkle tree root hash (block hash)
+	blockHash := tree.Root()
+
+	// sign the block hash
+	s, err := privateKey.Sign(blockHash)
+	if err != nil {
+		return nil, err
+	}
+
+	lastHashProof, err := tree.GenerateProof(lastBlockHeader.Hash, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	proposer, err := peer.IDFromPrivateKey(privateKey)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, tx := range txs {
+		mp, err := tree.GenerateProof(tx.Hash, 0)
+		if err != nil {
+			return nil, err
+		}
+		tx.MerkleProof = mp
+	}
+
+	block := &Block{
+		Header: &BlockHeader{
+			Timestamp:     timestamp,
+			Height:        lastBlockHeader.Height + 1,
+			Proposer:      &proposer,
+			ProposerEth:   minerEth,
+			Signature:     s,
+			Hash:          blockHash,
+			LastHash:      lastBlockHeader.Hash,
+			LastHashProof: lastHashProof,
+			ElectionProof: eproof,
+		},
+		Data: txs,
+	}
+
+	return block, nil
+}

blockchain/types/transaction.go

@@ -0,0 +1,36 @@
+package types
+
+import (
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"time"
+
+	"github.com/wealdtech/go-merkletree"
+
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+type Transaction struct {
+	Hash        []byte
+	MerkleProof *merkletree.Proof // sets when transaction is added to block
+	Timestamp   time.Time
+	Data        []byte
+}
+
+func CreateTransaction(data []byte) *Transaction {
+	timestamp := time.Now()
+	encodedData := hex.EncodeToString(data)
+	hash := crypto.Keccak256([]byte(fmt.Sprintf("%s", encodedData)))
+	return &Transaction{
+		Hash:      hash,
+		Timestamp: timestamp,
+		Data:      data,
+	}
+}
+
+func (tx *Transaction) ValidateHash() bool {
+	encodedData := hex.EncodeToString(tx.Data)
+	h := crypto.Keccak256([]byte(fmt.Sprintf("%s", encodedData)))
+	return bytes.Equal(h, tx.Hash)
+}

blockchain/utils/index.go

@@ -0,0 +1,96 @@
+package utils
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"fmt"
+
+	"github.com/ledgerwatch/lmdb-go/lmdb"
+)
+
+const (
+	DefaultIndexPrefix = "indexes/"
+)
+
+var (
+	ErrIndexKeyNotFound = fmt.Errorf("key is not found in the index")
+)
+
+type Index struct {
+	name  string
+	dbEnv *lmdb.Env
+	db    lmdb.DBI
+}
+
+func NewIndex(name string, dbEnv *lmdb.Env, db lmdb.DBI) *Index {
+	return &Index{
+		name:  name,
+		db:    db,
+		dbEnv: dbEnv,
+	}
+}
+
+func (i *Index) PutUint64(key []byte, value uint64) error {
+	return i.dbEnv.Update(func(txn *lmdb.Txn) error {
+		data := make([]byte, 8)
+		binary.LittleEndian.PutUint64(data, value)
+		return txn.Put(i.db, i.constructIndexKey(key), data, 0)
+	})
+}
+
+func (i *Index) GetUint64(key []byte) (uint64, error) {
+	var num uint64
+	err := i.dbEnv.View(func(txn *lmdb.Txn) error {
+		data, err := txn.Get(i.db, i.constructIndexKey(key))
+		if err != nil {
+			if lmdb.IsNotFound(err) {
+				return ErrIndexKeyNotFound
+			}
+			return err
+		}
+		num = binary.LittleEndian.Uint64(data)
+		return nil
+	})
+	if err != nil {
+		return 0, err
+	}
+
+	return num, nil
+}
+
+func (i *Index) PutBytes(key []byte, value []byte) error {
+	return i.dbEnv.Update(func(txn *lmdb.Txn) error {
+		return txn.Put(i.db, i.constructIndexKey(key), value, 0)
+	})
+}
+
+func (i *Index) GetBytes(key []byte) ([]byte, error) {
+	var data []byte
+	err := i.dbEnv.View(func(txn *lmdb.Txn) error {
+		valueData, err := txn.Get(i.db, i.constructIndexKey(key))
+		if err != nil {
+			if lmdb.IsNotFound(err) {
+				return ErrIndexKeyNotFound
+			}
+			return err
+		}
+		data = valueData
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return data, nil
+}
+
+func (i *Index) Delete(key []byte) error {
+	return i.dbEnv.Update(func(txn *lmdb.Txn) error {
+		return txn.Del(i.db, i.constructIndexKey(key), nil)
+	})
+}
+
+func (i *Index) constructIndexKey(key []byte) []byte {
+	k := hex.EncodeToString(key)
+	return []byte(fmt.Sprintf("%s/%s/%s", DefaultIndexPrefix, i.name, k))
+}

blockchain/utils/verification.go

@@ -0,0 +1,27 @@
+package utils
+
+import (
+	"fmt"
+
+	"github.com/Secured-Finance/dione/blockchain/types"
+	"github.com/wealdtech/go-merkletree"
+	"github.com/wealdtech/go-merkletree/keccak256"
+)
+
+func VerifyTx(blockHeader *types.BlockHeader, tx *types.Transaction) error {
+	if tx.MerkleProof == nil {
+		return fmt.Errorf("block transaction doesn't have merkle proof")
+	}
+	txProofVerified, err := merkletree.VerifyProofUsing(tx.Hash, true, tx.MerkleProof, [][]byte{blockHeader.Hash}, keccak256.New())
+	if err != nil {
+		return fmt.Errorf("failed to verify tx hash merkle proof: %s", err.Error())
+	}
+	if !txProofVerified {
+		return fmt.Errorf("transaction doesn't present in block hash merkle tree")
+	}
+	if !tx.ValidateHash() {
+		return fmt.Errorf("transaction hash is invalid")
+	}
+
+	return nil
+}

cache/cache.go

@@ -0,0 +1,17 @@
+package cache
+
+import (
+	"errors"
+	"time"
+)
+
+var ErrNotFound = errors.New("key doesn't exist in cache")
+
+type Cache interface {
+	Store(key string, value interface{}) error
+	StoreWithTTL(key string, value interface{}, ttl time.Duration) error
+	Get(key string, value interface{}) error
+	Delete(key string)
+	Items() map[string]interface{}
+	Exists(key string) bool
+}

cache/event_cache_interface.go

@@ -1,9 +0,0 @@
-package cache
-
-import "github.com/Secured-Finance/dione/contracts/dioneOracle"
-
-type EventCache interface {
-	Store(key string, event interface{}) error
-	GetOracleRequestEvent(key string) (*dioneOracle.DioneOracleNewOracleRequest, error)
-	Delete(key string)
-}

cache/event_log_cache.go

@@ -1,50 +0,0 @@
-package cache
-
-import (
-	"github.com/Secured-Finance/dione/contracts/dioneOracle"
-	"github.com/VictoriaMetrics/fastcache"
-	"github.com/fxamacker/cbor/v2"
-)
-
-const (
-	// in megabytes
-	DefaultEventLogCacheCapacity = 32000000
-)
-
-type EventLogCache struct {
-	cache *fastcache.Cache
-}
-
-func NewEventLogCache() *EventLogCache {
-	return &EventLogCache{
-		cache: fastcache.New(DefaultEventLogCacheCapacity),
-	}
-}
-
-func (elc *EventLogCache) Store(key string, event interface{}) error {
-	mRes, err := cbor.Marshal(event)
-	if err != nil {
-		return err
-	}
-
-	elc.cache.SetBig([]byte(key), mRes)
-
-	return nil
-}
-
-func (elc *EventLogCache) GetOracleRequestEvent(key string) (*dioneOracle.DioneOracleNewOracleRequest, error) {
-	var mData []byte
-	mData = elc.cache.GetBig(mData, []byte(key))
-
-	var event *dioneOracle.DioneOracleNewOracleRequest
-	err := cbor.Unmarshal(mData, &event)
-	if err != nil {
-		return nil, err
-	}
-
-	return event, nil
-}
-
-func (elc *EventLogCache) Delete(key string) {
-	elc.cache.Del([]byte(key))
-}

cache/event_redis_cache.go

@@ -1,58 +0,0 @@
-package cache
-
-import (
-	"context"
-
-	"github.com/Secured-Finance/dione/config"
-	"github.com/Secured-Finance/dione/contracts/dioneOracle"
-	"github.com/fxamacker/cbor/v2"
-	"github.com/go-redis/redis/v8"
-)
-
-type EventRedisCache struct {
-	Client *redis.Client
-	ctx    context.Context
-}
-
-func NewEventRedisCache(config *config.Config) *EventRedisCache {
-	client := redis.NewClient(&redis.Options{
-		Addr:     config.Redis.Addr,
-		Password: config.Redis.Password,
-		DB:       config.Redis.DB,
-	})
-
-	return &EventRedisCache{
-		Client: client,
-		ctx:    context.Background(),
-	}
-}
-
-func (erc *EventRedisCache) Store(key string, event interface{}) error {
-	mRes, err := cbor.Marshal(event)
-	if err != nil {
-		return err
-	}
-
-	erc.Client.Set(erc.ctx, key, mRes, 0)
-
-	return nil
-}
-
-func (erc *EventRedisCache) GetOracleRequestEvent(key string) (*dioneOracle.DioneOracleNewOracleRequest, error) {
-	mData, err := erc.Client.Get(erc.ctx, key).Bytes()
-	if err != nil {
-		return nil, err
-	}
-
-	var event *dioneOracle.DioneOracleNewOracleRequest
-	err = cbor.Unmarshal(mData, &event)
-	if err != nil {
-		return nil, err
-	}
-
-	return event, nil
-}
-
-func (erc *EventRedisCache) Delete(key string) {
-	erc.Client.Del(erc.ctx, key)
-}

cache/inmemory_cache.go

@@ -0,0 +1,69 @@
+package cache
+
+import (
+	"fmt"
+	"reflect"
+	"time"
+
+	"github.com/patrickmn/go-cache"
+)
+
+const (
+	DefaultCacheExpiration = 5 * time.Minute
+	DefaultGCInterval      = 10 * time.Minute
+)
+
+type InMemoryCache struct {
+	cache *cache.Cache
+}
+
+func NewInMemoryCache() Cache {
+	return &InMemoryCache{
+		cache: cache.New(DefaultCacheExpiration, DefaultGCInterval),
+	}
+}
+
+func (imc *InMemoryCache) Store(key string, value interface{}) error {
+	imc.cache.Set(key, value, cache.NoExpiration)
+
+	return nil
+}
+
+func (imc *InMemoryCache) StoreWithTTL(key string, value interface{}, ttl time.Duration) error {
+	imc.cache.Set(key, value, ttl)
+	return nil
+}
+
+func (imc *InMemoryCache) Get(key string, value interface{}) error {
+	v, exists := imc.cache.Get(key)
+	if !exists {
+		return ErrNotFound
+	}
+	reflectedValue := reflect.ValueOf(value)
+	if reflectedValue.Kind() != reflect.Ptr {
+		return fmt.Errorf("value isn't a pointer")
+	}
+	if reflectedValue.IsNil() {
+		reflectedValue.Set(reflect.New(reflectedValue.Type().Elem()))
+	}
+	reflectedValue.Elem().Set(reflect.ValueOf(v).Elem())
+
+	return nil
+}
+
+func (imc *InMemoryCache) Delete(key string) {
+	imc.cache.Delete(key)
+}
+
+func (imc *InMemoryCache) Items() map[string]interface{} {
+	m := make(map[string]interface{})
+	for k, v := range imc.cache.Items() {
+		m[k] = v.Object
+	}
+	return m
+}
+
+func (imc *InMemoryCache) Exists(key string) bool {
+	_, exists := imc.cache.Get(key)
+	return exists
+}

cache/redis_cache.go

@@ -0,0 +1,98 @@
+package cache
+
+import (
+	"bytes"
+	"context"
+	"encoding/gob"
+	"errors"
+	"time"
+
+	"github.com/Secured-Finance/dione/config"
+	"github.com/go-redis/redis/v8"
+)
+
+type RedisCache struct {
+	Client *redis.Client
+	ctx    context.Context
+}
+
+func NewRedisCache(config *config.Config) *RedisCache {
+	client := redis.NewClient(&redis.Options{
+		Addr:     config.Redis.Addr,
+		Password: config.Redis.Password,
+		DB:       config.Redis.DB,
+	})
+
+	return &RedisCache{
+		Client: client,
+		ctx:    context.Background(),
+	}
+}
+
+func (rc *RedisCache) Store(key string, value interface{}) error {
+	data, err := gobMarshal(value)
+	if err != nil {
+		return err
+	}
+
+	rc.Client.Set(rc.ctx, key, data, 0)
+
+	return nil
+}
+
+func (rc *RedisCache) StoreWithTTL(key string, value interface{}, ttl time.Duration) error {
+	data, err := gobMarshal(value)
+	if err != nil {
+		return err
+	}
+	rc.Client.Set(rc.ctx, key, data, ttl)
+
+	return nil
+}
+
+func gobMarshal(val interface{}) ([]byte, error) {
+	buf := bytes.NewBuffer(nil)
+	enc := gob.NewEncoder(buf)
+	err := enc.Encode(val)
+	if err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+func gobUnmarshal(data []byte, val interface{}) error {
+	buf := bytes.NewBuffer(data)
+	dec := gob.NewDecoder(buf)
+	return dec.Decode(&val)
+}
+
+func (rc *RedisCache) Get(key string, value interface{}) error {
+	data, err := rc.Client.Get(rc.ctx, key).Bytes()
+	if err != nil {
+		if errors.Is(err, redis.Nil) {
+			return ErrNotFound
+		}
+		return err
+	}
+
+	return gobUnmarshal(data, &value)
+}
+
+func (rc *RedisCache) Delete(key string) {
+	rc.Client.Del(rc.ctx, key)
+}
+
+func (rc *RedisCache) Items() map[string]interface{} {
+	return nil // TODO
+}
+
+func (rc *RedisCache) Exists(key string) bool {
+	res := rc.Client.Exists(context.TODO(), key)
+	if res.Err() != nil {
+		return false
+	}
+	if res.Val() == 0 {
+		return false
+	}
+	return true
+}

config/config.go

@@ -7,18 +7,20 @@ import (
 )
 
 type Config struct {
-	ListenPort            int            `mapstructure:"listen_port"`
-	ListenAddr            string         `mapstructure:"listen_addr"`
-	IsBootstrap           bool           `mapstructure:"is_bootstrap"`
-	BootstrapNodes        []string       `mapstructure:"bootstrap_node_multiaddr"`
-	Rendezvous            string         `mapstructure:"rendezvous"`
-	Ethereum              EthereumConfig `mapstructure:"ethereum"`
-	Filecoin              FilecoinConfig `mapstructure:"filecoin"`
-	PubSub                PubSubConfig   `mapstructure:"pubSub"`
-	Store                 StoreConfig    `mapstructure:"store"`
-	ConsensusMinApprovals int            `mapstructure:"consensus_min_approvals"`
-	Redis                 RedisConfig    `mapstructure:"redis"`
-	CacheType             string         `mapstructure:"cache_type"`
+	ListenPort            int              `mapstructure:"listen_port"`
+	ListenAddr            string           `mapstructure:"listen_addr"`
+	IsBootstrap           bool             `mapstructure:"is_bootstrap"`
+	BootstrapNodes        []string         `mapstructure:"bootstrap_node_multiaddr"`
+	Rendezvous            string           `mapstructure:"rendezvous"`
+	Ethereum              EthereumConfig   `mapstructure:"ethereum"`
+	Filecoin              FilecoinConfig   `mapstructure:"filecoin"`
+	PubSub                PubSubConfig     `mapstructure:"pubsub"`
+	Store                 StoreConfig      `mapstructure:"store"`
+	ConsensusMinApprovals int              `mapstructure:"consensus_min_approvals"`
+	Redis                 RedisConfig      `mapstructure:"redis"`
+	CacheType             string           `mapstructure:"cache_type"`
+	Blockchain            BlockchainConfig `mapstructure:"blockchain"`
+	PrivateKeyPath        string           `mapstructure:"private_key_path"`
 }
 
 type EthereumConfig struct {
@@ -39,8 +41,7 @@ type FilecoinConfig struct {
 }
 
 type PubSubConfig struct {
-	ProtocolID       string `mapstructure:"protocolID"`
-	ServiceTopicName string `mapstructure:"serviceTopicName"`
+	ServiceTopicName string `mapstructure:"service_topic_name"`
 }
 
 type StoreConfig struct {
@@ -53,6 +54,10 @@ type RedisConfig struct {
 	DB       int    `mapstructure:"redis_db"`
 }
 
+type BlockchainConfig struct {
+	DatabasePath string `mapstructure:"database_path"`
+}
+
 // NewConfig creates a new config based on default values or provided .env file
 func NewConfig(configPath string) (*Config, error) {
 	dbName := "dione"
@@ -64,12 +69,12 @@ func NewConfig(configPath string) (*Config, error) {
 		ListenAddr:     "localhost",
 		ListenPort:     8000,
 		BootstrapNodes: []string{"/ip4/127.0.0.1/tcp/0"},
-		Rendezvous:     "filecoin-p2p-oracle",
+		Rendezvous:     "dione",
 		Ethereum: EthereumConfig{
 			PrivateKey: "",
 		},
 		PubSub: PubSubConfig{
-			ProtocolID: "p2p-oracle",
+			ServiceTopicName: "dione",
 		},
 		Store: StoreConfig{
 			DatabaseURL: dbURL,

config/drand.go

@@ -28,3 +28,5 @@ func NewDrandConfig() *DrandConfig {
 	}
 	return cfg
 }
+
+var DrandChainGenesisTime = uint64(1603603302)

config/tasks.go

@@ -1,9 +0,0 @@
-package config
-
-var ExpectedLeadersPerEpoch = int64(5)
-
-var TasksPerEpoch = uint64(ExpectedLeadersPerEpoch)
-
-var ChainGenesis = uint64(1603603302)
-
-var TaskEpochInterval = uint64(15)

config/win_config.go

@@ -0,0 +1,5 @@
+package config
+
+import "math/big"
+
+var ExpectedLeadersPerEpoch = big.NewInt(2)

consensus/consensus.go

@@ -1,169 +1,424 @@
 package consensus
 
 import (
+	"encoding/hex"
+	"errors"
+	"fmt"
 	"math/big"
-	"sync"
+	"sort"
+	"time"
 
-	"github.com/Secured-Finance/dione/cache"
+	drand2 "github.com/Secured-Finance/dione/beacon/drand"
+
+	"github.com/libp2p/go-libp2p-core/peer"
+
+	"github.com/fxamacker/cbor/v2"
+
+	"github.com/asaskevich/EventBus"
+
+	"github.com/Secured-Finance/dione/blockchain"
+
+	types3 "github.com/Secured-Finance/dione/blockchain/types"
+
+	"github.com/libp2p/go-libp2p-core/crypto"
+
+	"github.com/Secured-Finance/dione/blockchain/pool"
 
 	"github.com/Secured-Finance/dione/consensus/types"
+	types2 "github.com/Secured-Finance/dione/types"
 
 	"github.com/Secured-Finance/dione/ethclient"
 	"github.com/sirupsen/logrus"
 
 	"github.com/Secured-Finance/dione/pubsub"
-	types2 "github.com/Secured-Finance/dione/types"
+)
+
+var (
+	ErrNoAcceptedBlocks = errors.New("there is no accepted blocks")
 )
 
 type PBFTConsensusManager struct {
-	psb            *pubsub.PubSubRouter
-	minApprovals   int
-	privKey        []byte
-	msgLog         *MessageLog
-	validator      *ConsensusValidator
-	consensusMap   map[string]*Consensus
-	ethereumClient *ethclient.EthereumClient
-	miner          *Miner
-	eventCache     cache.EventCache
+	bus                 EventBus.Bus
+	psb                 *pubsub.PubSubRouter
+	privKey             crypto.PrivKey
+	validator           *ConsensusValidator
+	ethereumClient      *ethclient.EthereumClient
+	miner               *blockchain.Miner
+	consensusRoundPool  *ConsensusStatePool
+	mempool             *pool.Mempool
+	blockchain          *blockchain.BlockChain
+	address             peer.ID
+	stateChangeChannels map[string]map[State][]chan bool
 }
 
-type Consensus struct {
-	mutex                sync.Mutex
-	Finished             bool
-	IsCurrentMinerLeader bool
-	Task                 *types2.DioneTask
-}
+func NewPBFTConsensusManager(
+	bus EventBus.Bus,
+	psb *pubsub.PubSubRouter,
+	privKey crypto.PrivKey,
+	ethereumClient *ethclient.EthereumClient,
+	miner *blockchain.Miner,
+	bc *blockchain.BlockChain,
+	bp *ConsensusStatePool,
+	db *drand2.DrandBeacon,
+	mempool *pool.Mempool,
+	address peer.ID,
+) *PBFTConsensusManager {
+	pcm := &PBFTConsensusManager{
+		psb:                 psb,
+		miner:               miner,
+		validator:           NewConsensusValidator(miner, bc, db),
+		privKey:             privKey,
+		ethereumClient:      ethereumClient,
+		bus:                 bus,
+		consensusRoundPool:  bp,
+		mempool:             mempool,
+		blockchain:          bc,
+		address:             address,
+		stateChangeChannels: map[string]map[State][]chan bool{},
+	}
+
+	pcm.psb.Hook(pubsub.PrePrepareMessageType, pcm.handlePrePrepare)
+	pcm.psb.Hook(pubsub.PrepareMessageType, pcm.handlePrepare)
+	pcm.psb.Hook(pubsub.CommitMessageType, pcm.handleCommit)
+
+	pcm.bus.SubscribeAsync("beacon:newEntry", func(entry types2.BeaconEntry) {
+		pcm.onNewBeaconEntry(entry)
+	}, true)
+
+	pcm.bus.SubscribeAsync("consensus:newState", func(block *types3.Block, newStateNumber int) {
+		newState := State(newStateNumber) // hacky, because reflection panics if we pass int to a handler which has type-alias for int
+
+		consensusMessageType := types.ConsensusMessageTypeUnknown
+
+		switch newState {
+		case StateStatusPrePrepared:
+			{
+				logrus.WithField("blockHash", fmt.Sprintf("%x", block.Header.Hash)).Debugf("Entered into PREPREPARED state")
+				if *block.Header.Proposer == pcm.address {
+					return
+				}
+				consensusMessageType = types.ConsensusMessageTypePrepare
+				break
+			}
+		case StateStatusPrepared:
+			{
+				consensusMessageType = types.ConsensusMessageTypeCommit
+				logrus.WithField("blockHash", fmt.Sprintf("%x", block.Header.Hash)).Debugf("Entered into PREPARED state")
+				break
+			}
+		case StateStatusCommited:
+			{
+				logrus.WithField("blockHash", fmt.Sprintf("%x", block.Header.Hash)).Debugf("Entered into COMMITTED state")
+				break
+			}
+		}
+
+		if consensusMessageType == types.ConsensusMessageTypeUnknown {
+			return
+		}
+
+		message, err := NewMessage(&types.ConsensusMessage{
+			Type:      consensusMessageType,
+			Blockhash: block.Header.Hash,
+		}, pcm.privKey)
+		if err != nil {
+			logrus.Errorf("Failed to create consensus message: %v", err)
+			return
+		}
+		if err = pcm.psb.BroadcastToServiceTopic(message); err != nil {
+			logrus.Errorf("Failed to send consensus message: %s", err.Error())
+			return
+		}
+	}, true)
 
-func NewPBFTConsensusManager(psb *pubsub.PubSubRouter, minApprovals int, privKey []byte, ethereumClient *ethclient.EthereumClient, miner *Miner, evc cache.EventCache) *PBFTConsensusManager {
-	pcm := &PBFTConsensusManager{}
-	pcm.psb = psb
-	pcm.miner = miner
-	pcm.validator = NewConsensusValidator(evc, miner)
-	pcm.msgLog = NewMessageLog()
-	pcm.minApprovals = minApprovals
-	pcm.privKey = privKey
-	pcm.ethereumClient = ethereumClient
-	pcm.eventCache = evc
-	pcm.consensusMap = map[string]*Consensus{}
-	pcm.psb.Hook(types.MessageTypePrePrepare, pcm.handlePrePrepare)
-	pcm.psb.Hook(types.MessageTypePrepare, pcm.handlePrepare)
-	pcm.psb.Hook(types.MessageTypeCommit, pcm.handleCommit)
 	return pcm
 }
 
-func (pcm *PBFTConsensusManager) Propose(task types2.DioneTask) error {
-	pcm.createConsensusInfo(&task, true)
-
-	prePrepareMsg, err := CreatePrePrepareWithTaskSignature(&task, pcm.privKey)
+func (pcm *PBFTConsensusManager) propose(blk *types3.Block) error {
+	cmsg := &types.ConsensusMessage{
+		Type:      StateStatusPrePrepared,
+		Block:     blk,
+		Blockhash: blk.Header.Hash,
+		From:      pcm.address,
+	}
+	prePrepareMsg, err := NewMessage(cmsg, pcm.privKey)
 	if err != nil {
 		return err
 	}
-	pcm.psb.BroadcastToServiceTopic(prePrepareMsg)
+
+	time.Sleep(1 * time.Second) // wait until all nodes will commit previous blocks
+
+	if err = pcm.consensusRoundPool.InsertMessageIntoLog(cmsg); err != nil {
+		return err
+	}
+
+	if err = pcm.psb.BroadcastToServiceTopic(prePrepareMsg); err != nil {
+		return err
+	}
+
+	logrus.WithField("blockHash", fmt.Sprintf("%x", blk.Header.Hash)).Debugf("Entered into PREPREPARED state")
 	return nil
 }
 
-func (pcm *PBFTConsensusManager) handlePrePrepare(message *types.Message) {
-	if message.Payload.Task.Miner == pcm.miner.address {
-		return
-	}
-	if pcm.msgLog.Exists(*message) {
-		logrus.Debugf("received existing pre_prepare msg, dropping...")
-		return
-	}
-	if !pcm.validator.Valid(*message) {
-		logrus.Warn("received invalid pre_prepare msg, dropping...")
-		return
-	}
-
-	pcm.msgLog.AddMessage(*message)
-
-	prepareMsg, err := NewMessage(message, types.MessageTypePrepare)
+func (pcm *PBFTConsensusManager) handlePrePrepare(message *pubsub.PubSubMessage) {
+	var prePrepare types.PrePrepareMessage
+	err := cbor.Unmarshal(message.Payload, &prePrepare)
 	if err != nil {
-		logrus.Errorf("failed to create prepare message: %v", err)
+		logrus.Errorf("failed to convert payload to PrePrepare message: %s", err.Error())
+		return
 	}
 
-	pcm.createConsensusInfo(&message.Payload.Task, false)
+	if *prePrepare.Block.Header.Proposer == pcm.address {
+		return
+	}
 
-	pcm.psb.BroadcastToServiceTopic(&prepareMsg)
+	cmsg := &types.ConsensusMessage{
+		Type:      types.ConsensusMessageTypePrePrepare,
+		From:      message.From,
+		Block:     prePrepare.Block,
+		Blockhash: prePrepare.Block.Header.Hash,
+	}
+
+	if !pcm.validator.Valid(cmsg) {
+		logrus.WithField("blockHash", hex.EncodeToString(cmsg.Block.Header.Hash)).Warn("Received invalid PREPREPARE for block")
+		return
+	}
+
+	err = pcm.consensusRoundPool.InsertMessageIntoLog(cmsg)
+	if err != nil {
+		logrus.WithField("err", err.Error()).Warn("Failed to add PREPARE message to log")
+		return
+	}
+
+	logrus.WithFields(logrus.Fields{
+		"blockHash": fmt.Sprintf("%x", cmsg.Block.Header.Hash),
+		"from":      message.From.String(),
+	}).Debug("Received PREPREPARE message")
 }
 
-func (pcm *PBFTConsensusManager) handlePrepare(message *types.Message) {
-	if pcm.msgLog.Exists(*message) {
-		logrus.Debugf("received existing prepare msg, dropping...")
-		return
-	}
-	if !pcm.validator.Valid(*message) {
-		logrus.Warn("received invalid prepare msg, dropping...")
+func (pcm *PBFTConsensusManager) handlePrepare(message *pubsub.PubSubMessage) {
+	var prepare types.PrepareMessage
+	err := cbor.Unmarshal(message.Payload, &prepare)
+	if err != nil {
+		logrus.Errorf("failed to convert payload to Prepare message: %s", err.Error())
 		return
 	}
 
-	pcm.msgLog.AddMessage(*message)
+	cmsg := &types.ConsensusMessage{
+		Type:      types.ConsensusMessageTypePrepare,
+		From:      message.From,
+		Blockhash: prepare.Blockhash,
+		Signature: prepare.Signature,
+	}
 
-	if len(pcm.msgLog.GetMessagesByTypeAndConsensusID(types.MessageTypePrepare, message.Payload.Task.ConsensusID)) >= pcm.minApprovals {
-		commitMsg, err := NewMessage(message, types.MessageTypeCommit)
+	if !pcm.validator.Valid(cmsg) {
+		logrus.Warnf("received invalid prepare msg for block %x", cmsg.Blockhash)
+		return
+	}
+
+	err = pcm.consensusRoundPool.InsertMessageIntoLog(cmsg)
+	if err != nil {
+		logrus.WithField("err", err.Error()).Warn("Failed to add PREPARE message to log")
+		return
+	}
+
+	logrus.WithFields(logrus.Fields{
+		"blockHash": fmt.Sprintf("%x", cmsg.Blockhash),
+		"from":      message.From.String(),
+	}).Debug("Received PREPARE message")
+}
+
+func (pcm *PBFTConsensusManager) handleCommit(message *pubsub.PubSubMessage) {
+	var commit types.CommitMessage
+	err := cbor.Unmarshal(message.Payload, &commit)
+	if err != nil {
+		logrus.Errorf("failed to convert payload to Commit message: %s", err.Error())
+		return
+	}
+
+	cmsg := &types.ConsensusMessage{
+		Type:      types.ConsensusMessageTypeCommit,
+		From:      message.From,
+		Blockhash: commit.Blockhash,
+		Signature: commit.Signature,
+	}
+
+	if !pcm.validator.Valid(cmsg) {
+		logrus.Warnf("received invalid commit msg for block %x", cmsg.Blockhash)
+		return
+	}
+
+	err = pcm.consensusRoundPool.InsertMessageIntoLog(cmsg)
+	if err != nil {
+		logrus.WithField("err", err.Error()).Warn("Failed to add COMMIT message to log")
+		return
+	}
+
+	logrus.WithFields(logrus.Fields{
+		"blockHash": fmt.Sprintf("%x", cmsg.Blockhash),
+		"from":      message.From.String(),
+	}).Debug("Received COMMIT message")
+}
+
+func (pcm *PBFTConsensusManager) onNewBeaconEntry(entry types2.BeaconEntry) {
+	block, err := pcm.commitAcceptedBlocks()
+	height, _ := pcm.blockchain.GetLatestBlockHeight()
+	if err != nil {
+		if errors.Is(err, ErrNoAcceptedBlocks) {
+			logrus.WithFields(logrus.Fields{
+				"height": height + 1,
+			}).Infof("No accepted blocks in the current consensus round")
+		} else {
+			logrus.WithFields(logrus.Fields{
+				"height": height + 1,
+				"err":    err.Error(),
+			}).Errorf("Failed to select the block in the current consensus round")
+			return
+		}
+	}
+
+	if block != nil {
+		// broadcast new block
+		var newBlockMessage pubsub.PubSubMessage
+		newBlockMessage.Type = pubsub.NewBlockMessageType
+		blockSerialized, err := cbor.Marshal(block)
 		if err != nil {
-			logrus.Errorf("failed to create commit message: %w", err)
+			logrus.Errorf("Failed to serialize block %x for broadcasting!", block.Header.Hash)
+		} else {
+			newBlockMessage.Payload = blockSerialized
+			pcm.psb.BroadcastToServiceTopic(&newBlockMessage)
 		}
-		pcm.psb.BroadcastToServiceTopic(&commitMsg)
-	}
-}
 
-func (pcm *PBFTConsensusManager) handleCommit(message *types.Message) {
-	if pcm.msgLog.Exists(*message) {
-		logrus.Debugf("received existing commit msg, dropping...")
-		return
+		// if we are miner of this block
+		// then post dione tasks to target chains (currently, only Ethereum)
+		if block.Header.Proposer.String() == pcm.address.String() {
+			pcm.submitTasksFromBlock(block)
+		}
 	}
-	if !pcm.validator.Valid(*message) {
-		logrus.Warn("received invalid commit msg, dropping...")
+
+	for k, v := range pcm.stateChangeChannels {
+		for k1, j := range v {
+			for _, ch := range j {
+				ch <- true
+				close(ch)
+			}
+			delete(v, k1)
+		}
+		delete(pcm.stateChangeChannels, k)
+	}
+
+	minedBlock, err := pcm.miner.MineBlock(entry.Data, entry.Round)
+	if err != nil {
+		if errors.Is(err, blockchain.ErrNoTxForBlock) {
+			logrus.Info("Sealing skipped, no transactions in mempool")
+		} else {
+			logrus.Errorf("Failed to mine the block: %s", err.Error())
+		}
 		return
 	}
 
-	pcm.msgLog.AddMessage(*message)
-
-	consensusMsg := message.Payload
-	if len(pcm.msgLog.GetMessagesByTypeAndConsensusID(types.MessageTypeCommit, message.Payload.Task.ConsensusID)) >= pcm.minApprovals {
-		info := pcm.GetConsensusInfo(consensusMsg.Task.ConsensusID)
-		if info == nil {
-			logrus.Debugf("consensus doesn't exist in our consensus map - skipping...")
+	// if we are round winner
+	if minedBlock != nil {
+		err = pcm.propose(minedBlock)
+		if err != nil {
+			logrus.Errorf("Failed to propose the block: %s", err.Error())
 			return
 		}
-		info.mutex.Lock()
-		defer info.mutex.Unlock()
-		if info.Finished {
-			return
-		}
-		if info.IsCurrentMinerLeader {
-			logrus.Infof("Submitting on-chain result for consensus ID: %s", consensusMsg.Task.ConsensusID)
-			reqID, ok := new(big.Int).SetString(consensusMsg.Task.RequestID, 10)
-			if !ok {
-				logrus.Errorf("Failed to parse request ID: %v", consensusMsg.Task.RequestID)
-			}
-
-			err := pcm.ethereumClient.SubmitRequestAnswer(reqID, consensusMsg.Task.Payload)
-			if err != nil {
-				logrus.Errorf("Failed to submit on-chain result: %v", err)
-			}
-		}
-
-		info.Finished = true
 	}
 }
 
-func (pcm *PBFTConsensusManager) createConsensusInfo(task *types2.DioneTask, isLeader bool) {
-	if _, ok := pcm.consensusMap[task.ConsensusID]; !ok {
-		pcm.consensusMap[task.ConsensusID] = &Consensus{
-			IsCurrentMinerLeader: isLeader,
-			Task:                 task,
-			Finished:             false,
+func (pcm *PBFTConsensusManager) submitTasksFromBlock(block *types3.Block) {
+	for _, tx := range block.Data {
+		var task types2.DioneTask
+		err := cbor.Unmarshal(tx.Data, &task)
+		if err != nil {
+			logrus.WithFields(logrus.Fields{
+				"err":    err.Error(),
+				"txHash": hex.EncodeToString(tx.Hash),
+			}).Error("Failed to unmarshal transaction payload")
+			continue // FIXME
+		}
+		reqIDNumber, ok := big.NewInt(0).SetString(task.RequestID, 10)
+		if !ok {
+			logrus.WithFields(logrus.Fields{
+				"txHash": hex.EncodeToString(tx.Hash),
+			}).Error("Failed to parse request id number in Dione task")
+			continue // FIXME
+		}
+
+		err = pcm.ethereumClient.SubmitRequestAnswer(reqIDNumber, task.Payload)
+		if err != nil {
+			logrus.WithFields(logrus.Fields{
+				"err":    err.Error(),
+				"txHash": hex.EncodeToString(tx.Hash),
+				"reqID":  reqIDNumber.String(),
+			}).Error("Failed to submit task to ETH chain")
+			continue // FIXME
+		}
+		logrus.WithFields(logrus.Fields{
+			"txHash": hex.EncodeToString(tx.Hash),
+			"reqID":  reqIDNumber.String(),
+		}).Debug("Dione task has been sucessfully submitted to ETH chain (DioneOracle contract)")
+	}
+}
+
+func (pcm *PBFTConsensusManager) commitAcceptedBlocks() (*types3.Block, error) {
+	blocks := pcm.consensusRoundPool.GetAllBlocksWithCommit()
+	if blocks == nil {
+		return nil, ErrNoAcceptedBlocks
+	}
+	var selectedBlock *types3.Block
+
+	sort.Slice(blocks, func(i, j int) bool {
+		iStake, err := pcm.ethereumClient.GetMinerStake(blocks[i].Block.Header.ProposerEth)
+		if err != nil {
+			logrus.Error(err)
+			return false
+		}
+
+		jStake, err := pcm.ethereumClient.GetMinerStake(blocks[j].Block.Header.ProposerEth)
+		if err != nil {
+			logrus.Error(err)
+			return false
+		}
+
+		if iStake.Cmp(jStake) == -1 {
+			return false
+		} else if iStake.Cmp(jStake) == 1 {
+			return true
+		} else {
+			return blocks[i].Block.Header.Timestamp > blocks[j].Block.Header.Timestamp
+		}
+	})
+
+	selectedBlock = blocks[0].Block
+
+	stake, err := pcm.ethereumClient.GetMinerStake(selectedBlock.Header.ProposerEth)
+	if err != nil {
+		logrus.Error(err)
+		return nil, err
+	}
+
+	logrus.WithFields(logrus.Fields{
+		"winCount":      selectedBlock.Header.ElectionProof.WinCount,
+		"proposerStake": stake.String(),
+	}).Debug("Selected the block with maximal win count and proposer's stake.")
+
+	logrus.WithFields(logrus.Fields{
+		"hash":   hex.EncodeToString(selectedBlock.Header.Hash),
+		"height": selectedBlock.Header.Height,
+		"miner":  selectedBlock.Header.Proposer.String(),
+	}).Info("Committed new block")
+	pcm.consensusRoundPool.Prune()
+	for _, v := range selectedBlock.Data {
+		err := pcm.mempool.DeleteTx(v.Hash)
+		if err != nil {
+			logrus.WithFields(logrus.Fields{
+				"err": err.Error(),
+				"tx":  hex.EncodeToString(v.Hash),
+			}).Errorf("Failed to delete committed tx from mempool")
+			continue
 		}
 	}
-}
-
-func (pcm *PBFTConsensusManager) GetConsensusInfo(consensusID string) *Consensus {
-	c, ok := pcm.consensusMap[consensusID]
-	if !ok {
-		return nil
-	}
-
-	return c
+	return selectedBlock, pcm.blockchain.StoreBlock(selectedBlock)
 }

consensus/consensus_round_pool.go

@@ -0,0 +1,126 @@
+package consensus
+
+import (
+	"encoding/hex"
+	"fmt"
+	"sync"
+
+	types2 "github.com/Secured-Finance/dione/consensus/types"
+
+	"github.com/Secured-Finance/dione/blockchain/pool"
+
+	"github.com/asaskevich/EventBus"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/Secured-Finance/dione/blockchain/types"
+)
+
+type State uint8
+
+const (
+	StateStatusUnknown = iota
+
+	StateStatusPrePrepared
+	StateStatusPrepared
+	StateStatusCommited
+)
+
+// ConsensusStatePool is pool for blocks that isn't not validated or committed yet
+type ConsensusStatePool struct {
+	mempool          *pool.Mempool
+	consensusInfoMap map[string]*ConsensusInfo
+	mapMutex         sync.Mutex
+	bus              EventBus.Bus
+	minApprovals     int // FIXME
+}
+
+func NewConsensusRoundPool(mp *pool.Mempool, bus EventBus.Bus, minApprovals int) (*ConsensusStatePool, error) {
+	bp := &ConsensusStatePool{
+		consensusInfoMap: map[string]*ConsensusInfo{},
+		mempool:          mp,
+		bus:              bus,
+		minApprovals:     minApprovals,
+	}
+
+	return bp, nil
+}
+
+type ConsensusInfo struct {
+	Blockhash  []byte
+	Block      *types.Block
+	State      State
+	MessageLog *ConsensusMessageLog
+}
+
+func (crp *ConsensusStatePool) InsertMessageIntoLog(cmsg *types2.ConsensusMessage) error {
+	crp.mapMutex.Lock()
+	defer crp.mapMutex.Unlock()
+	consensusInfo, ok := crp.consensusInfoMap[hex.EncodeToString(cmsg.Blockhash)]
+	if !ok {
+		consensusInfo = &ConsensusInfo{
+			Block:      cmsg.Block,
+			Blockhash:  cmsg.Blockhash,
+			State:      StateStatusUnknown,
+			MessageLog: NewConsensusMessageLog(),
+		}
+		crp.consensusInfoMap[hex.EncodeToString(cmsg.Blockhash)] = consensusInfo
+	}
+
+	added := consensusInfo.MessageLog.AddMessage(cmsg)
+	if !added {
+		return fmt.Errorf("consensus message already exists in message log")
+	}
+
+	crp.maybeUpdateConsensusState(consensusInfo, cmsg)
+
+	return nil
+}
+
+func (crp *ConsensusStatePool) maybeUpdateConsensusState(ci *ConsensusInfo, cmsg *types2.ConsensusMessage) {
+	if ci.State == StateStatusUnknown && cmsg.Type == types2.ConsensusMessageTypePrePrepare && cmsg.Block != nil {
+		ci.Block = cmsg.Block
+		logrus.WithField("hash", fmt.Sprintf("%x", cmsg.Block.Header.Hash)).Debug("New block discovered")
+		ci.State = StateStatusPrePrepared
+		crp.bus.Publish("consensus:newState", ci.Block, StateStatusPrePrepared)
+	}
+
+	if len(ci.MessageLog.Get(types2.ConsensusMessageTypePrepare, cmsg.Blockhash)) >= crp.minApprovals-1 && ci.State == StateStatusPrePrepared { // FIXME approval across 2f nodes
+		ci.State = StateStatusPrepared
+		crp.bus.Publish("consensus:newState", ci.Block, StateStatusPrepared)
+	}
+
+	if len(ci.MessageLog.Get(types2.ConsensusMessageTypeCommit, cmsg.Blockhash)) >= crp.minApprovals && ci.State == StateStatusPrepared { // FIXME approval across 2f+1 nodes
+		ci.State = StateStatusCommited
+		crp.bus.Publish("consensus:newState", ci.Block, StateStatusCommited)
+	}
+}
+
+// Prune cleans known blocks list. It is called when new consensus round starts.
+func (crp *ConsensusStatePool) Prune() {
+	for k := range crp.consensusInfoMap {
+		delete(crp.consensusInfoMap, k)
+	}
+	crp.bus.Publish("blockpool:pruned")
+}
+
+func (crp *ConsensusStatePool) GetAllBlocksWithCommit() []*ConsensusInfo {
+	crp.mapMutex.Lock()
+	defer crp.mapMutex.Unlock()
+	var consensusInfos []*ConsensusInfo
+	for _, v := range crp.consensusInfoMap {
+		if v.State == StateStatusCommited {
+			consensusInfos = append(consensusInfos, v)
+		}
+	}
+	return consensusInfos
+}
+
+//func containsTx(s []*types.Transaction, e *types.Transaction) bool {
+//	for _, a := range s {
+//		if bytes.Equal(a.Hash, e.Hash) {
+//			return true
+//		}
+//	}
+//	return false
+//}

consensus/consensus_validator.go

@@ -1,156 +1,62 @@
 package consensus
 
 import (
-	"github.com/Secured-Finance/dione/cache"
-	types2 "github.com/Secured-Finance/dione/consensus/types"
-	"github.com/Secured-Finance/dione/consensus/validation"
-	"github.com/Secured-Finance/dione/types"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/filecoin-project/go-state-types/crypto"
+	"encoding/hex"
+
+	drand2 "github.com/Secured-Finance/dione/beacon/drand"
+
 	"github.com/sirupsen/logrus"
+
+	"github.com/Secured-Finance/dione/blockchain"
+	types2 "github.com/Secured-Finance/dione/consensus/types"
 )
 
 type ConsensusValidator struct {
-	validationFuncMap map[types2.MessageType]func(msg types2.Message) bool
-	eventCache        cache.EventCache
-	miner             *Miner
+	validationFuncMap map[types2.ConsensusMessageType]func(msg *types2.ConsensusMessage) bool
+	miner             *blockchain.Miner
+	beacon            *drand2.DrandBeacon
+	blockchain        *blockchain.BlockChain
 }
 
-func NewConsensusValidator(ec cache.EventCache, miner *Miner) *ConsensusValidator {
+func NewConsensusValidator(miner *blockchain.Miner, bc *blockchain.BlockChain, db *drand2.DrandBeacon) *ConsensusValidator {
 	cv := &ConsensusValidator{
-		eventCache: ec,
 		miner:      miner,
+		blockchain: bc,
+		beacon:     db,
 	}
 
-	cv.validationFuncMap = map[types2.MessageType]func(msg types2.Message) bool{
-		types2.MessageTypePrePrepare: func(msg types2.Message) bool {
-			// TODO here we need to do validation of tx itself
-			consensusMsg := msg.Payload
-
-			// === verify task signature ===
-			err := VerifyTaskSignature(consensusMsg.Task)
-			if err != nil {
-				logrus.Errorf("unable to verify signature: %v", err)
-				return false
-			}
-			/////////////////////////////////
-
-			// === verify if request exists in event log cache ===
-			requestEvent, err := cv.eventCache.GetOracleRequestEvent("request_" + consensusMsg.Task.RequestID)
-			if err != nil {
-				logrus.Errorf("the incoming request task event doesn't exist in the EVC, or is broken: %v", err)
-				return false
-			}
-			if requestEvent.OriginChain != consensusMsg.Task.OriginChain ||
-				requestEvent.RequestType != consensusMsg.Task.RequestType ||
-				requestEvent.RequestParams != consensusMsg.Task.RequestParams {
-
-				logrus.Errorf("the incoming task and cached request event don't match!")
-				return false
-			}
-			/////////////////////////////////
-
-			// === verify election proof wincount preliminarily ===
-			if consensusMsg.Task.ElectionProof.WinCount < 1 {
-				logrus.Error("miner isn't a winner!")
-				return false
-			}
-			/////////////////////////////////
-
-			// === verify miner's eligibility to propose this task ===
-			err = cv.miner.IsMinerEligibleToProposeTask(common.HexToAddress(consensusMsg.Task.MinerEth))
-			if err != nil {
-				logrus.Errorf("miner is not eligible to propose task: %v", err)
-				return false
-			}
-			/////////////////////////////////
-
-			// === verify election proof vrf ===
-			minerAddressMarshalled, err := consensusMsg.Task.Miner.MarshalBinary()
-			if err != nil {
-				logrus.Errorf("failed to marshal miner address: %v", err)
-				return false
-			}
-			electionProofRandomness, err := DrawRandomness(
-				consensusMsg.Task.BeaconEntries[1].Data,
-				crypto.DomainSeparationTag_ElectionProofProduction,
-				consensusMsg.Task.DrandRound,
-				minerAddressMarshalled,
-			)
-			if err != nil {
-				logrus.Errorf("failed to draw electionProofRandomness: %v", err)
-				return false
-			}
-			err = VerifyVRF(consensusMsg.Task.Miner, electionProofRandomness, consensusMsg.Task.ElectionProof.VRFProof)
-			if err != nil {
-				logrus.Errorf("failed to verify election proof vrf: %v", err)
-			}
-			//////////////////////////////////////
-
-			// === verify ticket vrf ===
-			ticketRandomness, err := DrawRandomness(
-				consensusMsg.Task.BeaconEntries[1].Data,
-				crypto.DomainSeparationTag_TicketProduction,
-				consensusMsg.Task.DrandRound-types.TicketRandomnessLookback,
-				minerAddressMarshalled,
-			)
-			if err != nil {
-				logrus.Errorf("failed to draw ticket electionProofRandomness: %v", err)
-				return false
-			}
-
-			err = VerifyVRF(consensusMsg.Task.Miner, ticketRandomness, consensusMsg.Task.Ticket.VRFProof)
-			if err != nil {
-				logrus.Errorf("failed to verify ticket vrf: %v", err)
-			}
-			//////////////////////////////////////
-
-			// === compute wincount locally and verify values ===
-			mStake, nStake, err := cv.miner.GetStakeInfo(common.HexToAddress(consensusMsg.Task.MinerEth))
-			if err != nil {
-				logrus.Errorf("failed to get miner stake: %v", err)
-				return false
-			}
-			actualWinCount := consensusMsg.Task.ElectionProof.ComputeWinCount(*mStake, *nStake)
-			if consensusMsg.Task.ElectionProof.WinCount != actualWinCount {
-				logrus.Errorf("locally computed wincount isn't matching received value!", err)
-				return false
-			}
-			//////////////////////////////////////
-
-			// === validate payload by specific-chain checks ===
-			if validationFunc := validation.GetValidationMethod(consensusMsg.Task.OriginChain, consensusMsg.Task.RequestType); validationFunc != nil {
-				err := validationFunc(consensusMsg.Task.Payload)
-				if err != nil {
-					logrus.Errorf("payload validation has failed: %v", err)
-					return false
-				}
-			} else {
-				logrus.Debugf("Origin chain [%v]/request type[%v] doesn't have any payload validation!", consensusMsg.Task.OriginChain, consensusMsg.Task.RequestType)
-			}
-			/////////////////////////////////
-
-			return true
-		},
-		types2.MessageTypePrepare: func(msg types2.Message) bool {
-			err := VerifyTaskSignature(msg.Payload.Task)
-			if err != nil {
-				return false
-			}
-			return true
-		},
-		types2.MessageTypeCommit: func(msg types2.Message) bool {
-			err := VerifyTaskSignature(msg.Payload.Task)
-			if err != nil {
+	cv.validationFuncMap = map[types2.ConsensusMessageType]func(msg *types2.ConsensusMessage) bool{
+		types2.ConsensusMessageTypePrePrepare: func(msg *types2.ConsensusMessage) bool {
+			if err := cv.blockchain.ValidateBlock(msg.Block); err != nil {
+				logrus.WithFields(logrus.Fields{
+					"blockHash": hex.EncodeToString(msg.Block.Header.Hash),
+					"err":       err.Error(),
+				}).Error("failed to validate block from PrePrepare message")
 				return false
 			}
 			return true
 		},
+		types2.ConsensusMessageTypePrepare: checkSignatureForBlockhash,
+		types2.ConsensusMessageTypeCommit:  checkSignatureForBlockhash,
 	}
 
 	return cv
 }
 
-func (cv *ConsensusValidator) Valid(msg types2.Message) bool {
+func (cv *ConsensusValidator) Valid(msg *types2.ConsensusMessage) bool {
 	return cv.validationFuncMap[msg.Type](msg)
 }
+
+func checkSignatureForBlockhash(msg *types2.ConsensusMessage) bool {
+	pubKey, err := msg.From.ExtractPublicKey()
+	if err != nil {
+		// TODO logging
+		return false
+	}
+	ok, err := pubKey.Verify(msg.Blockhash, msg.Signature)
+	if err != nil {
+		// TODO logging
+		return false
+	}
+	return ok
+}

consensus/dispute_manager.go

@@ -5,14 +5,21 @@ import (
 	"encoding/hex"
 	"time"
 
-	"math/big"
+	"github.com/ethereum/go-ethereum/event"
+
+	types2 "github.com/Secured-Finance/dione/blockchain/types"
+
+	"github.com/Secured-Finance/dione/types"
+	"github.com/fxamacker/cbor/v2"
+
+	"github.com/sirupsen/logrus"
+	"golang.org/x/crypto/sha3"
+
+	"github.com/Secured-Finance/dione/blockchain"
 
 	"github.com/Secured-Finance/dione/contracts/dioneDispute"
 	"github.com/Secured-Finance/dione/contracts/dioneOracle"
 	"github.com/Secured-Finance/dione/ethclient"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/sirupsen/logrus"
-	"golang.org/x/crypto/sha3"
 )
 
 type DisputeManager struct {
@@ -22,74 +29,83 @@ type DisputeManager struct {
 	submissionMap map[string]*dioneOracle.DioneOracleSubmittedOracleRequest
 	disputeMap    map[string]*dioneDispute.DioneDisputeNewDispute
 	voteWindow    time.Duration
+	blockchain    *blockchain.BlockChain
+
+	submissionChan         chan *dioneOracle.DioneOracleSubmittedOracleRequest
+	submissionSubscription event.Subscription
+
+	disputesChan         chan *dioneDispute.DioneDisputeNewDispute
+	disputesSubscription event.Subscription
 }
 
-func NewDisputeManager(ctx context.Context, ethClient *ethclient.EthereumClient, pcm *PBFTConsensusManager, voteWindow int) (*DisputeManager, error) {
-	newSubmittionsChan, submSubscription, err := ethClient.SubscribeOnNewSubmittions(ctx)
+func NewDisputeManager(ctx context.Context, ethClient *ethclient.EthereumClient, pcm *PBFTConsensusManager, voteWindow int, bc *blockchain.BlockChain) (*DisputeManager, error) {
+	submissionChan, submSubscription, err := ethClient.SubscribeOnNewSubmittions(ctx)
 	if err != nil {
 		return nil, err
 	}
 
-	newDisputesChan, dispSubscription, err := ethClient.SubscribeOnNewDisputes(ctx)
+	disputesChan, dispSubscription, err := ethClient.SubscribeOnNewDisputes(ctx)
 	if err != nil {
 		return nil, err
 	}
 
 	dm := &DisputeManager{
-		ethClient:     ethClient,
-		pcm:           pcm,
-		ctx:           ctx,
-		submissionMap: map[string]*dioneOracle.DioneOracleSubmittedOracleRequest{},
-		disputeMap:    map[string]*dioneDispute.DioneDisputeNewDispute{},
-		voteWindow:    time.Duration(voteWindow) * time.Second,
+		ethClient:              ethClient,
+		pcm:                    pcm,
+		ctx:                    ctx,
+		submissionMap:          map[string]*dioneOracle.DioneOracleSubmittedOracleRequest{},
+		disputeMap:             map[string]*dioneDispute.DioneDisputeNewDispute{},
+		voteWindow:             time.Duration(voteWindow) * time.Second,
+		blockchain:             bc,
+		submissionChan:         submissionChan,
+		submissionSubscription: submSubscription,
+		disputesChan:           disputesChan,
+		disputesSubscription:   dispSubscription,
 	}
 
+	return dm, nil
+}
+
+func (dm *DisputeManager) Run(ctx context.Context) {
 	go func() {
 		for {
 			select {
 			case <-ctx.Done():
 				{
-					submSubscription.Unsubscribe()
-					dispSubscription.Unsubscribe()
+					dm.disputesSubscription.Unsubscribe()
+					dm.disputesSubscription.Unsubscribe()
 					return
 				}
-			case s := <-newSubmittionsChan:
+			case s := <-dm.submissionChan:
 				{
 					dm.onNewSubmission(s)
 				}
-			case d := <-newDisputesChan:
+			case d := <-dm.disputesChan:
 				{
 					dm.onNewDispute(d)
 				}
 			}
 		}
 	}()
-
-	return dm, nil
 }
 
-func (dm *DisputeManager) onNewSubmission(submittion *dioneOracle.DioneOracleSubmittedOracleRequest) {
-	c := dm.pcm.GetConsensusInfo(submittion.ReqID.String())
-	if c == nil {
-		// todo: warn
+func (dm *DisputeManager) onNewSubmission(submission *dioneOracle.DioneOracleSubmittedOracleRequest) {
+	// find a block that contains the dione task with specified request id
+	task, block, err := dm.findTaskAndBlockWithRequestID(submission.ReqID.String())
+	if err != nil {
+		logrus.Error(err)
 		return
 	}
 
-	dm.submissionMap[submittion.ReqID.String()] = submittion
+	dm.submissionMap[submission.ReqID.String()] = submission
 
-	submHashBytes := sha3.Sum256(submittion.Data)
-	localHashBytes := sha3.Sum256(c.Task.Payload)
+	submHashBytes := sha3.Sum256(submission.Data)
+	localHashBytes := sha3.Sum256(task.Payload)
 	submHash := hex.EncodeToString(submHashBytes[:])
 	localHash := hex.EncodeToString(localHashBytes[:])
 	if submHash != localHash {
-		logrus.Debugf("submission of request id %s isn't valid - beginning dispute", c.Task.RequestID)
-		addr := common.HexToAddress(c.Task.MinerEth)
-		reqID, ok := big.NewInt(0).SetString(c.Task.RequestID, 10)
-		if !ok {
-			logrus.Errorf("cannot parse request id: %s", c.Task.RequestID)
-			return
-		}
-		err := dm.ethClient.BeginDispute(addr, reqID)
+		logrus.Debugf("submission of request id %s isn't valid - beginning dispute", submission.ReqID)
+		err := dm.ethClient.BeginDispute(block.Header.ProposerEth, submission.ReqID)
 		if err != nil {
 			logrus.Errorf(err.Error())
 			return
@@ -102,7 +118,7 @@ func (dm *DisputeManager) onNewSubmission(submittion *dioneOracle.DioneOracleSub
 					return
 				case <-disputeFinishTimer.C:
 					{
-						d, ok := dm.disputeMap[reqID.String()]
+						d, ok := dm.disputeMap[submission.ReqID.String()]
 						if !ok {
 							logrus.Error("cannot finish dispute: it doesn't exist in manager's dispute map!")
 							return
@@ -121,16 +137,45 @@ func (dm *DisputeManager) onNewSubmission(submittion *dioneOracle.DioneOracleSub
 	}
 }
 
+func (dm *DisputeManager) findTaskAndBlockWithRequestID(requestID string) (*types.DioneTask, *types2.Block, error) {
+	height, err := dm.blockchain.GetLatestBlockHeight()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	for {
+		block, err := dm.blockchain.FetchBlockByHeight(height)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		for _, v := range block.Data {
+			var task types.DioneTask
+			err := cbor.Unmarshal(v.Data, &task)
+			if err != nil {
+				logrus.Error(err)
+				continue
+			}
+
+			if task.RequestID == requestID {
+				return &task, block, nil
+			}
+		}
+
+		height--
+	}
+}
+
 func (dm *DisputeManager) onNewDispute(dispute *dioneDispute.DioneDisputeNewDispute) {
-	c := dm.pcm.GetConsensusInfo(dispute.RequestID.String())
-	if c == nil {
-		// todo: warn
+	task, _, err := dm.findTaskAndBlockWithRequestID(dispute.RequestID.String())
+	if err != nil {
+		logrus.Error(err)
 		return
 	}
 
 	subm, ok := dm.submissionMap[dispute.RequestID.String()]
 	if !ok {
-		// todo: warn
+		logrus.Warn("desired submission isn't found in map")
 		return
 	}
 
@@ -141,7 +186,7 @@ func (dm *DisputeManager) onNewDispute(dispute *dioneDispute.DioneDisputeNewDisp
 	}
 
 	submHashBytes := sha3.Sum256(subm.Data)
-	localHashBytes := sha3.Sum256(c.Task.Payload)
+	localHashBytes := sha3.Sum256(task.Payload)
 	submHash := hex.EncodeToString(submHashBytes[:])
 	localHash := hex.EncodeToString(localHashBytes[:])
 	if submHash == localHash {
@@ -152,7 +197,7 @@ func (dm *DisputeManager) onNewDispute(dispute *dioneDispute.DioneDisputeNewDisp
 		}
 	}
 
-	err := dm.ethClient.VoteDispute(dispute.Dhash, true)
+	err = dm.ethClient.VoteDispute(dispute.Dhash, true)
 	if err != nil {
 		logrus.Errorf(err.Error())
 		return

consensus/miner.go

@@ -1,187 +0,0 @@
-package consensus
-
-import (
-	"context"
-	"sync"
-
-	big2 "github.com/filecoin-project/go-state-types/big"
-
-	"github.com/Secured-Finance/dione/sigs"
-
-	"github.com/Secured-Finance/dione/rpc"
-
-	"github.com/Secured-Finance/dione/beacon"
-	"github.com/Secured-Finance/dione/contracts/dioneOracle"
-	"github.com/libp2p/go-libp2p-core/peer"
-
-	"github.com/Secured-Finance/dione/ethclient"
-	"github.com/Secured-Finance/dione/types"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/filecoin-project/go-state-types/crypto"
-	"github.com/sirupsen/logrus"
-	"golang.org/x/xerrors"
-)
-
-type Miner struct {
-	address      peer.ID
-	ethAddress   common.Address
-	mutex        sync.Mutex
-	beacon       beacon.BeaconNetworks
-	ethClient    *ethclient.EthereumClient
-	minerStake   types.BigInt
-	networkStake types.BigInt
-	privateKey   []byte
-}
-
-func NewMiner(
-	address peer.ID,
-	ethAddress common.Address,
-	beacon beacon.BeaconNetworks,
-	ethClient *ethclient.EthereumClient,
-	privateKey []byte,
-) *Miner {
-	return &Miner{
-		address:    address,
-		ethAddress: ethAddress,
-		beacon:     beacon,
-		ethClient:  ethClient,
-		privateKey: privateKey,
-	}
-}
-
-func (m *Miner) UpdateCurrentStakeInfo() error {
-	mStake, err := m.ethClient.GetMinerStake(m.ethAddress)
-
-	if err != nil {
-		logrus.Warn("Can't get miner stake", err)
-		return err
-	}
-
-	nStake, err := m.ethClient.GetTotalStake()
-
-	if err != nil {
-		logrus.Warn("Can't get miner stake", err)
-		return err
-	}
-
-	m.minerStake = *mStake
-	m.networkStake = *nStake
-
-	return nil
-}
-
-func (m *Miner) GetStakeInfo(miner common.Address) (*types.BigInt, *types.BigInt, error) {
-	mStake, err := m.ethClient.GetMinerStake(miner)
-
-	if err != nil {
-		logrus.Warn("Can't get miner stake", err)
-		return nil, nil, err
-	}
-
-	nStake, err := m.ethClient.GetTotalStake()
-
-	if err != nil {
-		logrus.Warn("Can't get miner stake", err)
-		return nil, nil, err
-	}
-
-	return mStake, nStake, nil
-}
-
-func (m *Miner) MineTask(ctx context.Context, event *dioneOracle.DioneOracleNewOracleRequest) (*types.DioneTask, error) {
-	beaconValues, err := beacon.BeaconEntriesForTask(ctx, m.beacon)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to get beacon entries: %w", err)
-	}
-	logrus.Debug("attempting to mine the task at epoch: ", beaconValues[1].Round)
-
-	randomBase := beaconValues[1]
-
-	if err := m.UpdateCurrentStakeInfo(); err != nil {
-		return nil, xerrors.Errorf("failed to update miner stake: %w", err)
-	}
-
-	ticket, err := m.computeTicket(&randomBase)
-	if err != nil {
-		return nil, xerrors.Errorf("scratching ticket failed: %w", err)
-	}
-
-	winner, err := IsRoundWinner(
-		types.DrandRound(randomBase.Round),
-		m.address,
-		randomBase,
-		m.minerStake,
-		m.networkStake,
-		func(id peer.ID, bytes []byte) (*types.Signature, error) {
-			return sigs.Sign(types.SigTypeEd25519, m.privateKey, bytes)
-		},
-	)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to check if we win next round: %w", err)
-	}
-
-	if winner == nil {
-		return nil, nil
-	}
-
-	rpcMethod := rpc.GetRPCMethod(event.OriginChain, event.RequestType)
-	if rpcMethod == nil {
-		return nil, xerrors.Errorf("invalid rpc method name/type")
-	}
-	res, err := rpcMethod(event.RequestParams)
-	if err != nil {
-		return nil, xerrors.Errorf("couldn't do rpc request: %w", err)
-	}
-
-	return &types.DioneTask{
-		OriginChain:   event.OriginChain,
-		RequestType:   event.RequestType,
-		RequestParams: event.RequestParams,
-		RequestID:     event.ReqID.String(),
-		ConsensusID:   event.ReqID.String(),
-		Miner:         m.address,
-		MinerEth:      m.ethAddress.Hex(),
-		Ticket:        ticket,
-		ElectionProof: winner,
-		BeaconEntries: beaconValues,
-		Payload:       res,
-		DrandRound:    types.DrandRound(randomBase.Round),
-	}, nil
-}
-
-func (m *Miner) computeTicket(brand *types.BeaconEntry) (*types.Ticket, error) {
-	buf, err := m.address.MarshalBinary()
-	if err != nil {
-		return nil, xerrors.Errorf("failed to marshal address: %w", err)
-	}
-
-	round := types.DrandRound(brand.Round)
-
-	input, err := DrawRandomness(brand.Data, crypto.DomainSeparationTag_TicketProduction, round-types.TicketRandomnessLookback, buf)
-	if err != nil {
-		return nil, err
-	}
-
-	vrfOut, err := ComputeVRF(func(id peer.ID, bytes []byte) (*types.Signature, error) {
-		return sigs.Sign(types.SigTypeEd25519, m.privateKey, bytes)
-	}, m.address, input)
-	if err != nil {
-		return nil, err
-	}
-
-	return &types.Ticket{
-		VRFProof: vrfOut,
-	}, nil
-}
-
-func (m *Miner) IsMinerEligibleToProposeTask(ethAddress common.Address) error {
-	mStake, err := m.ethClient.GetMinerStake(ethAddress)
-	if err != nil {
-		return err
-	}
-	ok := mStake.GreaterThanEqual(big2.NewInt(ethclient.MinMinerStake))
-	if !ok {
-		return xerrors.Errorf("miner doesn't have enough staked tokens")
-	}
-	return nil
-}

consensus/msg_log.go

@@ -1,40 +1,50 @@
 package consensus
 
 import (
+	"bytes"
+
 	types2 "github.com/Secured-Finance/dione/consensus/types"
 	mapset "github.com/Secured-Finance/golang-set"
 )
 
-type MessageLog struct {
-	messages          mapset.Set
-	maxLogSize        int
-	validationFuncMap map[types2.MessageType]func(message types2.Message)
+type ConsensusMessageLog struct {
+	messages mapset.Set
 }
 
-func NewMessageLog() *MessageLog {
-	msgLog := &MessageLog{
-		messages:   mapset.NewSet(),
-		maxLogSize: 0, // TODO
+func NewConsensusMessageLog() *ConsensusMessageLog {
+	msgLog := &ConsensusMessageLog{
+		messages: mapset.NewSet(),
 	}
 
 	return msgLog
 }
 
-func (ml *MessageLog) AddMessage(msg types2.Message) {
-	ml.messages.Add(msg)
+func (ml *ConsensusMessageLog) AddMessage(msg *types2.ConsensusMessage) bool {
+	return ml.messages.Add(msg)
 }
 
-func (ml *MessageLog) Exists(msg types2.Message) bool {
+func (ml *ConsensusMessageLog) Exists(msg *types2.ConsensusMessage) bool {
 	return ml.messages.Contains(msg)
 }
 
-func (ml *MessageLog) GetMessagesByTypeAndConsensusID(typ types2.MessageType, consensusID string) []types2.Message {
-	var result []types2.Message
+func (ml *ConsensusMessageLog) Get(typ types2.ConsensusMessageType, blockhash []byte) []*types2.ConsensusMessage {
+	var result []*types2.ConsensusMessage
 
 	for v := range ml.messages.Iter() {
-		msg := v.(types2.Message)
-		if msg.Type == typ && msg.Payload.Task.ConsensusID == consensusID {
-			result = append(result, msg)
+		msg := v.(*types2.ConsensusMessage)
+		if msg.Block != nil {
+
+		}
+		if msg.Type == typ {
+			var msgBlockHash []byte
+			if msg.Block != nil {
+				msgBlockHash = msg.Block.Header.Hash
+			} else {
+				msgBlockHash = msg.Blockhash
+			}
+			if bytes.Compare(msgBlockHash, blockhash) == 0 {
+				result = append(result, msg)
+			}
 		}
 	}
 

consensus/policy/policy.go

@@ -0,0 +1,7 @@
+package policy
+
+const (
+	BlockMaxTransactionCount         = 100
+	MaxBlockCountForRetrieving       = 500 // we do it just like in Bitcoin
+	MaxTransactionCountForRetrieving = 50000
+)

consensus/types/consensus_message.go

@@ -0,0 +1,25 @@
+package types
+
+import (
+	types3 "github.com/Secured-Finance/dione/blockchain/types"
+	"github.com/libp2p/go-libp2p-core/peer"
+)
+
+type ConsensusMessageType uint8
+
+const (
+	ConsensusMessageTypeUnknown = ConsensusMessageType(iota)
+
+	ConsensusMessageTypePrePrepare
+	ConsensusMessageTypePrepare
+	ConsensusMessageTypeCommit
+)
+
+// ConsensusMessage is common struct for various consensus message types. It is stored in consensus message log.
+type ConsensusMessage struct {
+	Type      ConsensusMessageType
+	Blockhash []byte
+	Signature []byte
+	Block     *types3.Block // it is optional, because not all message types have block included
+	From      peer.ID
+}

consensus/types/message.go

@@ -1,26 +1,16 @@
 package types
 
 import (
-	"github.com/Secured-Finance/dione/types"
-	"github.com/libp2p/go-libp2p-core/peer"
+	types2 "github.com/Secured-Finance/dione/blockchain/types"
 )
 
-type MessageType uint8
-
-const (
-	MessageTypeUnknown = MessageType(iota)
-
-	MessageTypePrePrepare
-	MessageTypePrepare
-	MessageTypeCommit
-)
-
-type ConsensusMessage struct {
-	Task types.DioneTask
+type PrePrepareMessage struct {
+	Block *types2.Block
 }
 
-type Message struct {
-	Type    MessageType
-	Payload ConsensusMessage
-	From    peer.ID `cbor:"-"`
+type PrepareMessage struct {
+	Blockhash []byte
+	Signature []byte
 }
+
+type CommitMessage PrepareMessage

consensus/utils.go

@@ -1,133 +1,70 @@
 package consensus
 
 import (
-	"encoding/binary"
 	"fmt"
 
+	"github.com/fxamacker/cbor/v2"
+
+	"github.com/Secured-Finance/dione/pubsub"
+
 	types2 "github.com/Secured-Finance/dione/consensus/types"
 
-	"github.com/mitchellh/hashstructure/v2"
-
-	"github.com/Secured-Finance/dione/sigs"
-	"github.com/minio/blake2b-simd"
-
-	"github.com/libp2p/go-libp2p-core/peer"
-
-	"github.com/Secured-Finance/dione/types"
-	"github.com/filecoin-project/go-state-types/crypto"
-	"golang.org/x/xerrors"
+	"github.com/libp2p/go-libp2p-core/crypto"
 )
 
-type SignFunc func(peer.ID, []byte) (*types.Signature, error)
-
-func ComputeVRF(sign SignFunc, worker peer.ID, sigInput []byte) ([]byte, error) {
-	sig, err := sign(worker, sigInput)
-	if err != nil {
-		return nil, err
+func NewMessage(cmsg *types2.ConsensusMessage, privKey crypto.PrivKey) (*pubsub.PubSubMessage, error) {
+	var message pubsub.PubSubMessage
+	switch cmsg.Type {
+	case types2.ConsensusMessageTypePrePrepare:
+		{
+			message.Type = pubsub.PrePrepareMessageType
+			msg := types2.PrePrepareMessage{
+				Block: cmsg.Block,
+			}
+			data, err := cbor.Marshal(msg)
+			if err != nil {
+				return nil, fmt.Errorf("failed to convert message to map: %s", err.Error())
+			}
+			message.Payload = data
+			break
+		}
+	case types2.ConsensusMessageTypePrepare:
+		{
+			message.Type = pubsub.PrepareMessageType
+			signature, err := privKey.Sign(cmsg.Blockhash)
+			if err != nil {
+				return nil, fmt.Errorf("failed to create signature: %v", err)
+			}
+			pm := types2.PrepareMessage{
+				Blockhash: cmsg.Blockhash,
+				Signature: signature,
+			}
+			data, err := cbor.Marshal(pm)
+			if err != nil {
+				return nil, fmt.Errorf("failed to convert message to map: %s", err.Error())
+			}
+			message.Payload = data
+			break
+		}
+	case types2.ConsensusMessageTypeCommit:
+		{
+			message.Type = pubsub.CommitMessageType
+			signature, err := privKey.Sign(cmsg.Blockhash)
+			if err != nil {
+				return nil, fmt.Errorf("failed to create signature: %v", err)
+			}
+			pm := types2.CommitMessage{
+				Blockhash: cmsg.Blockhash,
+				Signature: signature,
+			}
+			data, err := cbor.Marshal(pm)
+			if err != nil {
+				return nil, fmt.Errorf("failed to convert message to map: %s", err.Error())
+			}
+			message.Payload = data
+			break
+		}
 	}
 
-	if sig.Type != types.SigTypeEd25519 {
-		return nil, fmt.Errorf("miner worker address was not a Ed25519 key")
-	}
-
-	return sig.Data, nil
-}
-
-func VerifyVRF(worker peer.ID, vrfBase, vrfproof []byte) error {
-	err := sigs.Verify(&types.Signature{Type: types.SigTypeEd25519, Data: vrfproof}, []byte(worker), vrfBase)
-	if err != nil {
-		return xerrors.Errorf("vrf was invalid: %w", err)
-	}
-
-	return nil
-}
-
-func IsRoundWinner(round types.DrandRound,
-	worker peer.ID, brand types.BeaconEntry, minerStake, networkStake types.BigInt, sign SignFunc) (*types.ElectionProof, error) {
-
-	buf, err := worker.MarshalBinary()
-	if err != nil {
-		return nil, xerrors.Errorf("failed to marshal address: %w", err)
-	}
-
-	electionRand, err := DrawRandomness(brand.Data, crypto.DomainSeparationTag_ElectionProofProduction, round, buf)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to draw randomness: %w", err)
-	}
-
-	vrfout, err := ComputeVRF(sign, worker, electionRand)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to compute VRF: %w", err)
-	}
-
-	ep := &types.ElectionProof{VRFProof: vrfout}
-	j := ep.ComputeWinCount(minerStake, networkStake)
-	ep.WinCount = j
-	if j < 1 {
-		return nil, nil
-	}
-
-	return ep, nil
-}
-
-func DrawRandomness(rbase []byte, pers crypto.DomainSeparationTag, round types.DrandRound, entropy []byte) ([]byte, error) {
-	h := blake2b.New256()
-	if err := binary.Write(h, binary.BigEndian, int64(pers)); err != nil {
-		return nil, xerrors.Errorf("deriving randomness: %v", err)
-	}
-	VRFDigest := blake2b.Sum256(rbase)
-	_, err := h.Write(VRFDigest[:])
-	if err != nil {
-		return nil, xerrors.Errorf("hashing VRFDigest: %w", err)
-	}
-	if err := binary.Write(h, binary.BigEndian, round); err != nil {
-		return nil, xerrors.Errorf("deriving randomness: %v", err)
-	}
-	_, err = h.Write(entropy)
-	if err != nil {
-		return nil, xerrors.Errorf("hashing entropy: %v", err)
-	}
-
-	return h.Sum(nil), nil
-}
-
-func VerifyTaskSignature(task types.DioneTask) error {
-	cHash, err := hashstructure.Hash(task, hashstructure.FormatV2, nil)
-	if err != nil {
-		return err
-	}
-	err = sigs.Verify(
-		&types.Signature{Type: types.SigTypeEd25519, Data: task.Signature},
-		[]byte(task.Miner),
-		[]byte(fmt.Sprintf("%v", cHash)),
-	)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
-func NewMessage(msg *types2.Message, typ types2.MessageType) (types2.Message, error) {
-	var newMsg types2.Message
-	newMsg.Type = typ
-	newCMsg := msg.Payload
-	newMsg.Payload = newCMsg
-	return newMsg, nil
-}
-
-func CreatePrePrepareWithTaskSignature(task *types.DioneTask, privateKey []byte) (*types2.Message, error) {
-	var message types2.Message
-	message.Type = types2.MessageTypePrePrepare
-
-	cHash, err := hashstructure.Hash(task, hashstructure.FormatV2, nil)
-	if err != nil {
-		return nil, err
-	}
-	signature, err := sigs.Sign(types.SigTypeEd25519, privateKey, []byte(fmt.Sprintf("%v", cHash)))
-	if err != nil {
-		return nil, err
-	}
-	task.Signature = signature.Data
-	message.Payload = types2.ConsensusMessage{Task: *task}
 	return &message, nil
 }

consensus/validation/filecoin/filecoin.go

@@ -1,39 +1,40 @@
 package filecoin
 
 import (
-	"bytes"
+	"github.com/Secured-Finance/dione/types"
 
 	"github.com/Secured-Finance/dione/consensus/validation"
 	rtypes "github.com/Secured-Finance/dione/rpc/types"
-
-	ftypes "github.com/Secured-Finance/dione/rpc/filecoin/types"
-	"github.com/Secured-Finance/dione/sigs"
-	"github.com/sirupsen/logrus"
-	"golang.org/x/xerrors"
 )
 
-func ValidateGetTransaction(payload []byte) error {
-	var msg ftypes.SignedMessage
-	if err := msg.UnmarshalCBOR(bytes.NewReader(payload)); err != nil {
-		if err := msg.Message.UnmarshalCBOR(bytes.NewReader(payload)); err != nil {
-			return xerrors.Errorf("cannot unmarshal payload: %s", err.Error())
-		}
-	}
+func ValidateGetTransaction(task *types.DioneTask) error {
+	//var msg ftypes.SignedMessage
+	//if err := msg.UnmarshalCBOR(bytes.NewReader(payload)); err != nil {
+	//	if err := msg.Message.UnmarshalCBOR(bytes.NewReader(payload)); err != nil {
+	//		return xerrors.Errorf("cannot unmarshal payload: %s", err.Error())
+	//	}
+	//}
+	//
+	//if msg.Type == ftypes.MessageTypeSecp256k1 {
+	//	if err := sigs.Verify(&msg.Signature, msg.Message.From.Bytes(), msg.Message.Cid().Bytes()); err != nil {
+	//		logrus.Errorf("Couldn't verify transaction %v", err)
+	//		return xerrors.Errorf("Couldn't verify transaction: %v")
+	//	}
+	//	return nil
+	//} else {
+	//	// TODO: BLS Signature verification
+	//	return nil
+	//}
+	return validation.VerifyExactMatching(task)
+}
 
-	if msg.Type == ftypes.MessageTypeSecp256k1 {
-		if err := sigs.Verify(&msg.Signature, msg.Message.From.Bytes(), msg.Message.Cid().Bytes()); err != nil {
-			logrus.Errorf("Couldn't verify transaction %v", err)
-			return xerrors.Errorf("Couldn't verify transaction: %v")
-		}
-		return nil
-	} else {
-		// TODO: BLS Signature verification
-		return nil
-	}
+func ValidateGetBlock(task *types.DioneTask) error {
+	return validation.VerifyExactMatching(task)
 }
 
 func init() {
-	validation.RegisterValidation(rtypes.RPCTypeFilecoin, map[string]func([]byte) error{
+	validation.RegisterValidation(rtypes.RPCTypeFilecoin, map[string]func(*types.DioneTask) error{
 		"getTransaction": ValidateGetTransaction,
+		"getBlock":       ValidateGetBlock,
 	})
 }

consensus/validation/payload_validator.go

@@ -1,12 +1,14 @@
 package validation
 
-var validations = map[uint8]map[string]func([]byte) error{} // rpcType -> {rpcMethodName -> actual func var}
+import "github.com/Secured-Finance/dione/types"
 
-func RegisterValidation(typ uint8, methods map[string]func([]byte) error) {
+var validations = map[uint8]map[string]func(*types.DioneTask) error{} // rpcType -> {rpcMethodName -> actual func var}
+
+func RegisterValidation(typ uint8, methods map[string]func(*types.DioneTask) error) {
 	validations[typ] = methods
 }
 
-func GetValidationMethod(typ uint8, methodName string) func([]byte) error {
+func GetValidationMethod(typ uint8, methodName string) func(*types.DioneTask) error {
 	rpcMethods, ok := validations[typ]
 	if !ok {
 		return nil

consensus/validation/solana/solana.go

@@ -0,0 +1,17 @@
+package solana
+
+import (
+	"github.com/Secured-Finance/dione/consensus/validation"
+	rtypes "github.com/Secured-Finance/dione/rpc/types"
+	"github.com/Secured-Finance/dione/types"
+)
+
+func ValidateGetTransaction(task *types.DioneTask) error {
+	return validation.VerifyExactMatching(task)
+}
+
+func init() {
+	validation.RegisterValidation(rtypes.RPCTypeSolana, map[string]func(*types.DioneTask) error{
+		"getTransaction": ValidateGetTransaction,
+	})
+}

consensus/validation/utils.go

@@ -0,0 +1,24 @@
+package validation
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/Secured-Finance/dione/rpc"
+	"github.com/Secured-Finance/dione/types"
+)
+
+func VerifyExactMatching(task *types.DioneTask) error {
+	rpcMethod := rpc.GetRPCMethod(task.OriginChain, task.RequestType)
+	if rpcMethod == nil {
+		return fmt.Errorf("invalid RPC method")
+	}
+	res, err := rpcMethod(task.RequestParams)
+	if err != nil {
+		return fmt.Errorf("failed to invoke RPC method: %w", err)
+	}
+	if bytes.Compare(res, task.Payload) != 0 {
+		return fmt.Errorf("actual rpc response doesn't match with task's payload")
+	}
+	return nil
+}

drand/drand_test.go

@@ -1,23 +0,0 @@
-package drand
-
-import (
-	"context"
-	"encoding/hex"
-	"testing"
-
-	"github.com/Secured-Finance/dione/config"
-	drandClient "github.com/drand/drand/client/http"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestPrintGroupInfo(t *testing.T) {
-	cfg := config.NewDrandConfig()
-	ctx := context.Background()
-	drandServer := cfg.Servers[0]
-	client, err := drandClient.New(drandServer, nil, nil)
-	assert.NoError(t, err)
-	drandResult, err := client.Get(ctx, 266966)
-	assert.NoError(t, err)
-	stringSha256 := hex.EncodeToString(drandResult.Randomness())
-	assert.Equal(t, stringSha256, "cb67e13477cad0e54540980a3b621dfd9c5fcd7c92ed42626289a1de6f25c3d1")
-}

eth-contracts/.gitignore

@@ -4,3 +4,4 @@ cache
 dist
 coverage
 coverage.json
+scripts/private

eth-contracts/contracts/DioneOracle.sol

@@ -85,7 +85,7 @@ contract DioneOracle {
   function submitOracleRequest(uint256 _reqID, bytes memory _data) public onlyPendingRequest(_reqID) returns (bool) {
     require(pendingRequests[_reqID].deadline - int256(block.timestamp) >= 0, "submission has exceeded the deadline");
     delete pendingRequests[_reqID];
-    dioneStaking.mine(msg.sender);
+    dioneStaking.mineAndStake(msg.sender);
     pendingRequests[_reqID].callbackAddress.call(abi.encodeWithSelector(pendingRequests[_reqID].callbackMethodID, _reqID, _data));
     emit SubmittedOracleRequest(_reqID, _data);
     return true;

eth-contracts/hardhat.config.ts

@@ -1,30 +1,28 @@
-import { task } from "hardhat/config";
 import "@nomiclabs/hardhat-ethers";
 import "hardhat-tracer";
 import "@nomiclabs/hardhat-waffle";
 import "solidity-coverage";
 import "hardhat-gas-reporter";
-
-task("accounts", "Prints the list of accounts", async (args, hre) => {
-  const accounts = await hre.ethers.getSigners();
-
-  for (const account of accounts) {
-    console.log(await account.address);
-  }
-});
+import * as secrets from "./secrets.json";
+import "./hardhat.tasks";
+import "@nomiclabs/hardhat-etherscan";
 
 export default {
-  solidity: "0.8.3",
-  networks: {
-    geth: {
-      url: `http://localhost:8545`,
-      accounts: {
-        mnemonic: "test test test test test test test test test test test junk"
+  solidity: {
+    version: "0.8.3",
+    settings: {
+      optimizer: {
+        enabled: false,
+        runs: 200
       }
     }
   },
+  networks: secrets.networks,
   gasReporter: {
     currency: 'USD',
-    enabled: (process.env.REPORT_GAS) ? true : false
+    enabled: process.env.REPORT_GAS
+  },
+  etherscan: {
+    apiKey: secrets.etherscanApiKey
   }
 };

eth-contracts/hardhat.tasks.ts

@@ -0,0 +1,34 @@
+import { task } from "hardhat/config";
+import "@nomiclabs/hardhat-ethers";
+
+task("stake", "Prints an account's stake amount in DioneStaking contract")
+    .addParam("contract", "DioneStaking contract address")
+    .addParam("account", "The account's address")
+    .setAction(async (args, hre) => {
+        const DioneStaking = await hre.ethers.getContractFactory("DioneStaking");
+        const contract = DioneStaking.attach(args.contract);
+        const a = await contract.minerStake(args.account);
+        console.log("Stake amount:", a.div(hre.ethers.constants.WeiPerEther).toString());
+    });
+
+task("accounts", "Prints the list of accounts", async (args, hre) => {
+    const accounts = await hre.ethers.getSigners();
+      
+    for (const account of accounts) {
+        console.log(await account.address);
+    }
+});
+
+task("oracleRequest", "Makes oracle request to Mediator contract")
+    .addParam("contract", "Mediator contract address")
+    .addParam("chainid", "Chain ID from which need to request info")
+    .addParam("method", "Method name of requesting chain RPC")
+    .addParam("param", "Value of parameter for specified method")
+    .setAction(async (args, hre) => {
+        const Mediator = await hre.ethers.getContractFactory("Mediator");
+        const contract = Mediator.attach(args.contract);
+        const res = await contract.request(parseInt(args.chainid), args.method, args.param)
+        console.log("Request has successfully been sent.")
+        console.log("Transaction info:")
+        console.log(res)
+    })

eth-contracts/package-lock.json

@@ -13,6 +13,7 @@
       },
       "devDependencies": {
         "@nomiclabs/hardhat-ethers": "^2.0.2",
+        "@nomiclabs/hardhat-etherscan": "^2.1.4",
         "@nomiclabs/hardhat-waffle": "^2.0.1",
         "@types/chai": "^4.2.16",
         "@types/mocha": "^8.2.2",
@@ -1278,6 +1279,421 @@
         "hardhat": "^2.0.0"
       }
     },
+    "node_modules/@nomiclabs/hardhat-etherscan": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@nomiclabs/hardhat-etherscan/-/hardhat-etherscan-2.1.4.tgz",
+      "integrity": "sha512-KgFNTQv9gpioiTpQ9UlTysCAFfkcBonmEn9rVPTT22A7DRENFM1VTsVeGWF3AzRhd0mrASBF+o0gvbH30pSe0Q==",
+      "dev": true,
+      "dependencies": {
+        "@ethersproject/abi": "^5.1.2",
+        "@ethersproject/address": "^5.0.2",
+        "cbor": "^5.0.2",
+        "debug": "^4.1.1",
+        "fs-extra": "^7.0.1",
+        "node-fetch": "^2.6.0",
+        "semver": "^6.3.0"
+      },
+      "peerDependencies": {
+        "hardhat": "^2.0.4"
+      }
+    },
+    "node_modules/@nomiclabs/hardhat-etherscan/node_modules/@ethersproject/abi": {
+      "version": "5.4.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.4.0.tgz",
+      "integrity": "sha512-9gU2H+/yK1j2eVMdzm6xvHSnMxk8waIHQGYCZg5uvAyH0rsAzxkModzBSpbAkAuhKFEovC2S9hM4nPuLym8IZw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/address": "^5.4.0",
+        "@ethersproject/bignumber": "^5.4.0",
+        "@ethersproject/bytes": "^5.4.0",
+        "@ethersproject/constants": "^5.4.0",
+        "@ethersproject/hash": "^5.4.0",
+        "@ethersproject/keccak256": "^5.4.0",
+        "@ethersproject/logger": "^5.4.0",
+        "@ethersproject/properties": "^5.4.0",
+        "@ethersproject/strings": "^5.4.0"
+      }
+    },
+    "node_modules/@nomiclabs/hardhat-etherscan/node_modules/@ethersproject/abstract-provider": {
+      "version": "5.4.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/abstract-provider/-/abstract-provider-5.4.0.tgz",
+      "integrity": "sha512-vPBR7HKUBY0lpdllIn7tLIzNN7DrVnhCLKSzY0l8WAwxz686m/aL7ASDzrVxV93GJtIub6N2t4dfZ29CkPOxgA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/bignumber": "^5.4.0",
+        "@ethersproject/bytes": "^5.4.0",
+        "@ethersproject/logger": "^5.4.0",
+        "@ethersproject/networks": "^5.4.0",
+        "@ethersproject/properties": "^5.4.0",
+        "@ethersproject/transactions": "^5.4.0",
+        "@ethersproject/web": "^5.4.0"
+      }
+    },
+    "node_modules/@nomiclabs/hardhat-etherscan/node_modules/@ethersproject/abstract-signer": {
+      "version": "5.4.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/abstract-signer/-/abstract-signer-5.4.0.tgz",
+      "integrity": "sha512-AieQAzt05HJZS2bMofpuxMEp81AHufA5D6M4ScKwtolj041nrfIbIi8ciNW7+F59VYxXq+V4c3d568Q6l2m8ew==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/abstract-provider": "^5.4.0",
+        "@ethersproject/bignumber": "^5.4.0",
+        "@ethersproject/bytes": "^5.4.0",
+        "@ethersproject/logger": "^5.4.0",
+        "@ethersproject/properties": "^5.4.0"
+      }
+    },
+    "node_modules/@nomiclabs/hardhat-etherscan/node_modules/@ethersproject/address": {
+      "version": "5.4.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/address/-/address-5.4.0.tgz",
+      "integrity": "sha512-SD0VgOEkcACEG/C6xavlU1Hy3m5DGSXW3CUHkaaEHbAPPsgi0coP5oNPsxau8eTlZOk/bpa/hKeCNoK5IzVI2Q==",
+      "dev": true,
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+          }
+        },
+        "@ethersproject/constants": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/constants/-/constants-5.4.0.tgz",
+          "integrity": "sha512-tzjn6S7sj9+DIIeKTJLjK9WGN2Tj0P++Z8ONEIlZjyoTkBuODN+0VfhAyYksKi43l1Sx9tX2VlFfzjfmr5Wl3Q==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/bignumber": "^5.4.0"
+          }
+        },
+        "@ethersproject/hash": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/hash/-/hash-5.4.0.tgz",
+          "integrity": "sha512-xymAM9tmikKgbktOCjW60Z5sdouiIIurkZUr9oW5NOex5uwxrbsYG09kb5bMcNjlVeJD3yPivTNzViIs1GCbqA==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/abstract-signer": "^5.4.0",
+            "@ethersproject/address": "^5.4.0",
+            "@ethersproject/bignumber": "^5.4.0",
+            "@ethersproject/bytes": "^5.4.0",
+            "@ethersproject/keccak256": "^5.4.0",
+            "@ethersproject/logger": "^5.4.0",
+            "@ethersproject/properties": "^5.4.0",
+            "@ethersproject/strings": "^5.4.0"
+          }
+        },
+        "@ethersproject/keccak256": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/keccak256/-/keccak256-5.4.0.tgz",
+          "integrity": "sha512-FBI1plWet+dPUvAzPAeHzRKiPpETQzqSUWR1wXJGHVWi4i8bOSrpC3NwpkPjgeXG7MnugVc1B42VbfnQikyC/A==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/bytes": "^5.4.0",
+            "js-sha3": "0.5.7"
+          }
+        },
+        "@ethersproject/logger": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/logger/-/logger-5.4.0.tgz",
+          "integrity": "sha512-xYdWGGQ9P2cxBayt64d8LC8aPFJk6yWCawQi/4eJ4+oJdMMjEBMrIcIMZ9AxhwpPVmnBPrsB10PcXGmGAqgUEQ==",
+          "dev": true
+        },
+        "@ethersproject/networks": {
+          "version": "5.4.1",
+          "resolved": "https://registry.npmjs.org/@ethersproject/networks/-/networks-5.4.1.tgz",
+          "integrity": "sha512-8SvowCKz9Uf4xC5DTKI8+il8lWqOr78kmiqAVLYT9lzB8aSmJHQMD1GSuJI0CW4hMAnzocpGpZLgiMdzsNSPig==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/logger": "^5.4.0"
+          }
+        },
+        "@ethersproject/properties": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/properties/-/properties-5.4.0.tgz",
+          "integrity": "sha512-7jczalGVRAJ+XSRvNA6D5sAwT4gavLq3OXPuV/74o3Rd2wuzSL035IMpIMgei4CYyBdialJMrTqkOnzccLHn4A==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/logger": "^5.4.0"
+          }
+        },
+        "@ethersproject/rlp": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/rlp/-/rlp-5.4.0.tgz",
+          "integrity": "sha512-0I7MZKfi+T5+G8atId9QaQKHRvvasM/kqLyAH4XxBCBchAooH2EX5rL9kYZWwcm3awYV+XC7VF6nLhfeQFKVPg==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/bytes": "^5.4.0",
+            "@ethersproject/logger": "^5.4.0"
+          }
+        },
+        "@ethersproject/signing-key": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/signing-key/-/signing-key-5.4.0.tgz",
+          "integrity": "sha512-q8POUeywx6AKg2/jX9qBYZIAmKSB4ubGXdQ88l40hmATj29JnG5pp331nAWwwxPn2Qao4JpWHNZsQN+bPiSW9A==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/bytes": "^5.4.0",
+            "@ethersproject/logger": "^5.4.0",
+            "@ethersproject/properties": "^5.4.0",
+            "bn.js": "^4.11.9",
+            "elliptic": "6.5.4",
+            "hash.js": "1.1.7"
+          }
+        },
+        "@ethersproject/strings": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/strings/-/strings-5.4.0.tgz",
+          "integrity": "sha512-k/9DkH5UGDhv7aReXLluFG5ExurwtIpUfnDNhQA29w896Dw3i4uDTz01Quaptbks1Uj9kI8wo9tmW73wcIEaWA==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/bytes": "^5.4.0",
+            "@ethersproject/constants": "^5.4.0",
+            "@ethersproject/logger": "^5.4.0"
+          }
+        },
+        "@ethersproject/transactions": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/transactions/-/transactions-5.4.0.tgz",
+          "integrity": "sha512-s3EjZZt7xa4BkLknJZ98QGoIza94rVjaEed0rzZ/jB9WrIuu/1+tjvYCWzVrystXtDswy7TPBeIepyXwSYa4WQ==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/address": "^5.4.0",
+            "@ethersproject/bignumber": "^5.4.0",
+            "@ethersproject/bytes": "^5.4.0",
+            "@ethersproject/constants": "^5.4.0",
+            "@ethersproject/keccak256": "^5.4.0",
+            "@ethersproject/logger": "^5.4.0",
+            "@ethersproject/properties": "^5.4.0",
+            "@ethersproject/rlp": "^5.4.0",
+            "@ethersproject/signing-key": "^5.4.0"
+          }
+        },
+        "@ethersproject/web": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/@ethersproject/web/-/web-5.4.0.tgz",
+          "integrity": "sha512-1bUusGmcoRLYgMn6c1BLk1tOKUIFuTg8j+6N8lYlbMpDesnle+i3pGSagGNvwjaiLo4Y5gBibwctpPRmjrh4Og==",
+          "dev": true,
+          "requires": {
+            "@ethersproject/base64": "^5.4.0",
+            "@ethersproject/bytes": "^5.4.0",
+            "@ethersproject/logger": "^5.4.0",
+            "@ethersproject/properties": "^5.4.0",
+            "@ethersproject/strings": "^5.4.0"
+          }
+        },
+        "js-sha3": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/js-sha3/-/js-sha3-0.5.7.tgz",
+          "integrity": "sha1-DU/9gALVMzqrr0oj7tL2N0yfKOc=",
+          "dev": true
+        }
+      }
+    },
     "@nomiclabs/hardhat-waffle": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@nomiclabs/hardhat-waffle/-/hardhat-waffle-2.0.1.tgz",
@@ -22223,7 +22895,9 @@
       "resolved": "https://registry.npmjs.org/@typechain/ethers-v5/-/ethers-v5-2.0.0.tgz",
       "integrity": "sha512-0xdCkyGOzdqh4h5JSf+zoWx85IusEjDcPIwNEHP8mrWSnCae4rvrqB+/gtpdNfX7zjlFlZiMeePn2r63EI3Lrw==",
       "dev": true,
-      "requires": {}
+      "requires": {
+        "ethers": "^5.0.2"
+      }
     },
     "@types/bn.js": {
       "version": "4.11.6",
@@ -23064,6 +23738,16 @@
       "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
       "dev": true
     },
+    "cbor": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/cbor/-/cbor-5.2.0.tgz",
+      "integrity": "sha512-5IMhi9e1QU76ppa5/ajP1BmMWZ2FHkhAhjeVKQ/EFCgYSEaeVaoGtL7cxJskf9oCCk+XjzaIdc3IuU/dbA/o2A==",
+      "dev": true,
+      "requires": {
+        "bignumber.js": "^9.0.1",
+        "nofilter": "^1.0.4"
+      }
+    },
     "chai": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/chai/-/chai-4.3.4.tgz",
@@ -33148,7 +33832,9 @@
       "resolved": "https://registry.npmjs.org/hardhat-tracer/-/hardhat-tracer-1.0.0-alpha.5.tgz",
       "integrity": "sha512-25TZhzIrQgFyYs2oIZrdK6rU0XbK82nr759KYStyCzWklE6bxGlDO5niQugScAIo9aGAT/4vec/mxcJo1Ladpw==",
       "dev": true,
-      "requires": {}
+      "requires": {
+        "ethers": "^5.0.24"
+      }
     },
     "has": {
       "version": "1.0.3",
@@ -34565,6 +35251,12 @@
       "integrity": "sha512-MN6ZpzmfNCRM+3t57PTJHgHyw/h4OWnZ6mR8P5j/uZtqQr46RRuDE/P+g3n0YR/AiYXeWixZZzaip77gdICfRg==",
       "dev": true
     },
+    "nofilter": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/nofilter/-/nofilter-1.0.4.tgz",
+      "integrity": "sha512-N8lidFp+fCz+TD51+haYdbDGrcBWwuHX40F5+z0qkUjMJ5Tp+rdSuAkMJ9N9eoolDlEVTf6u5icM+cNKkKW2mA==",
+      "dev": true
+    },
     "nopt": {
       "version": "3.0.6",
       "resolved": "https://registry.npmjs.org/nopt/-/nopt-3.0.6.tgz",

eth-contracts/package.json

@@ -7,12 +7,13 @@
     "test": "TS_NODE_FILES=true npx hardhat test",
     "test:reportGas": "REPORT_GAS=1 TS_NODE_FILES=true npx hardhat test",
     "coverage": "TS_NODE_FILES=true npx hardhat coverage",
-    "deploy:local": "TS_NODE_FILES=true npx hardhat --network geth run scripts/deploy.ts"
+    "deploy:local": "TS_NODE_FILES=true npx hardhat --network local run scripts/deploy.ts"
   },
   "author": "",
   "license": "ISC",
   "devDependencies": {
     "@nomiclabs/hardhat-ethers": "^2.0.2",
+    "@nomiclabs/hardhat-etherscan": "^2.1.4",
     "@nomiclabs/hardhat-waffle": "^2.0.1",
     "@types/chai": "^4.2.16",
     "@types/mocha": "^8.2.2",

eth-contracts/test/DioneOracle.ts

@@ -5,7 +5,7 @@ import deploy from "../common/deployment";
 
 describe("DioneOracle", function () {
   let dioneOracle: Contract;
-  let dioneToken: Contract;
+  let dioneStaking: Contract;
 
   beforeEach(async function () {
     const contracts = await deploy({
@@ -20,11 +20,11 @@ describe("DioneOracle", function () {
       minStakeForDisputeVotes: 100
     });
     dioneOracle = contracts.dioneOracle;
-    dioneToken = contracts.dioneToken;
+    dioneStaking = contracts.dioneStaking;
   });
 
   it("should create request and cancel it", async function () {
-    const timestamp = 1625097600;
+    const timestamp = new Date().getTime();
     await ethers.provider.send("evm_setNextBlockTimestamp", [timestamp]);
     const requestDeadline = timestamp + 300;
     await expect(dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", "0x0000000000000000000000000000000000000000", "0x00000000"))
@@ -50,8 +50,8 @@ describe("DioneOracle", function () {
       .withArgs(1, BigNumber.from(0x8da5cb5b));
 
     // check if miner has received the reward
-    expect(await dioneToken.balanceOf(addr0.address))
-      .to.be.equal(ethers.constants.WeiPerEther.mul(100));
+    expect(await dioneStaking.minerStake(addr0.address))
+      .to.be.equal(ethers.constants.WeiPerEther.mul(9100));
   });
 
   it("should fail submission after request deadline", async function () {

eth-contracts/tsconfig.json

@@ -4,7 +4,8 @@
         "module": "commonjs",
         "strict": true,
         "esModuleInterop": true,
-        "outDir": "dist"
+        "outDir": "dist",
+        "resolveJsonModule": true
     },
     "include": ["./scripts", "./test", "./common"],
     "files": ["./hardhat.config.ts"]

ethclient/stake.go

@@ -1,7 +1,8 @@
 package ethclient
 
 import (
-	"github.com/Secured-Finance/dione/types"
+	"math/big"
+
 	"github.com/ethereum/go-ethereum/common"
 )
 
@@ -9,32 +10,22 @@ const (
 	MinMinerStake = 1000
 )
 
-// Getting total stake in DioneStaking contract, this function could
-// be used for storing the total stake and veryfing the stake tokens
-// on new tasks
-func (c *EthereumClient) GetTotalStake() (*types.BigInt, error) {
-	var b types.BigInt
+// GetTotalStake for getting total stake in DioneStaking contract
+func (c *EthereumClient) GetTotalStake() (*big.Int, error) {
 	totalStake, err := c.dioneStaking.TotalStake()
-
 	if err != nil {
 		return nil, err
 	}
 
-	b.Int = totalStake
-	return &b, nil
+	return totalStake, nil
 }
 
-// Getting miner stake in DioneStaking contract, this function could
-// be used for storing the miner's stake and veryfing the stake tokens
-// on new tasks
-func (c *EthereumClient) GetMinerStake(minerAddress common.Address) (*types.BigInt, error) {
-	var b types.BigInt
+// GetMinerStake for getting specified miner stake in DioneStaking contract
+func (c *EthereumClient) GetMinerStake(minerAddress common.Address) (*big.Int, error) {
 	minerStake, err := c.dioneStaking.MinerStake(minerAddress)
-
 	if err != nil {
 		return nil, err
 	}
 
-	b.Int = minerStake
-	return &b, nil
+	return minerStake, nil
 }

go.mod

@@ -1,13 +1,13 @@
 module github.com/Secured-Finance/dione
 
-go 1.14
+go 1.16
 
 require (
-	github.com/Secured-Finance/go-libp2p-pex v1.1.0
+	github.com/Secured-Finance/go-libp2p-pex v1.1.2
 	github.com/Secured-Finance/golang-set v1.8.0
-	github.com/VictoriaMetrics/fastcache v1.5.7
 	github.com/aristanetworks/goarista v0.0.0-20210308203447-b196d8410f1d // indirect
-	github.com/asaskevich/govalidator v0.0.0-20200907205600-7a23bdc65eef // indirect
+	github.com/asaskevich/EventBus v0.0.0-20200907212545-49d423059eef
+	github.com/btcsuite/btcd v0.22.0-beta // indirect
 	github.com/cespare/cp v1.1.1 // indirect
 	github.com/deckarep/golang-set v1.7.1 // indirect
 	github.com/dgrr/fastws v1.0.0
@@ -16,13 +16,11 @@ require (
 	github.com/ethereum/go-ethereum v1.9.25
 	github.com/filecoin-project/go-address v0.0.5
 	github.com/filecoin-project/go-crypto v0.0.0-20191218222705-effae4ea9f03
-	github.com/filecoin-project/go-state-types v0.1.0
 	github.com/filecoin-project/lotus v1.6.0
 	github.com/fjl/memsize v0.0.0-20190710130421-bcb5799ab5e5 // indirect
-	github.com/fxamacker/cbor/v2 v2.2.0
+	github.com/fxamacker/cbor/v2 v2.3.0
 	github.com/gballet/go-libpcsclite v0.0.0-20191108122812-4678299bea08 // indirect
 	github.com/go-kit/kit v0.10.0
-	github.com/go-ozzo/ozzo-validation v3.6.0+incompatible
 	github.com/go-redis/redis/v8 v8.7.0
 	github.com/gobwas/ws v1.0.4 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
@@ -30,20 +28,21 @@ require (
 	github.com/hashicorp/golang-lru v0.5.5-0.20210104140557-80c98217689d // indirect
 	github.com/huin/goupnp v1.0.1-0.20200620063722-49508fba0031 // indirect
 	github.com/ipfs/go-log v1.0.4
-	github.com/jmoiron/sqlx v1.2.0
+	github.com/ipfs/go-log/v2 v2.1.3 // indirect
 	github.com/karalabe/usb v0.0.0-20191104083709-911d15fe12a9 // indirect
-	github.com/klauspost/cpuid/v2 v2.0.6 // indirect
-	github.com/libp2p/go-libp2p v0.12.0
-	github.com/libp2p/go-libp2p-core v0.7.0
+	github.com/klauspost/cpuid/v2 v2.0.8 // indirect
+	github.com/ledgerwatch/lmdb-go v1.17.8
+	github.com/libp2p/go-libp2p v0.13.0
+	github.com/libp2p/go-libp2p-core v0.8.5
+	github.com/libp2p/go-libp2p-gorpc v0.1.3
 	github.com/libp2p/go-libp2p-pubsub v0.4.2-0.20210212194758-6c1addf493eb
-	github.com/mattn/go-sqlite3 v1.11.0
 	github.com/miguelmota/go-ethereum-hdwallet v0.0.0-20210314074952-8dd49aa599b9
 	github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1
-	github.com/mitchellh/hashstructure/v2 v2.0.1
 	github.com/mitchellh/mapstructure v1.3.3 // indirect
-	github.com/multiformats/go-multiaddr v0.3.1
+	github.com/multiformats/go-multiaddr v0.3.3
 	github.com/multiformats/go-multihash v0.0.15 // indirect
 	github.com/olekukonko/tablewriter v0.0.4 // indirect
+	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/raulk/clock v1.1.0
 	github.com/rjeczalik/notify v0.9.2 // indirect
 	github.com/rs/cors v1.7.0 // indirect
@@ -52,17 +51,18 @@ require (
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/spf13/viper v1.7.1
 	github.com/status-im/keycard-go v0.0.0-20200402102358-957c09536969 // indirect
-	github.com/stretchr/testify v1.7.0
 	github.com/tyler-smith/go-bip39 v1.1.0 // indirect
+	github.com/ugorji/go v1.2.6 // indirect
 	github.com/valyala/fasthttp v1.17.0
+	github.com/wealdtech/go-merkletree v1.0.1-0.20190605192610-2bb163c2ea2a
 	github.com/whyrusleeping/cbor-gen v0.0.0-20210219115102-f37d292932f2
-	github.com/xorcare/golden v0.6.1-0.20191112154924-b87f686d7542
-	go.uber.org/zap v1.16.0
-	golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b
+	go.uber.org/fx v1.13.1
+	go.uber.org/multierr v1.7.0 // indirect
+	go.uber.org/zap v1.17.0
+	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97
 	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
-	golang.org/x/net v0.0.0-20210428140749-89ef3d95e781 // indirect
-	golang.org/x/sys v0.0.0-20210426230700-d19ff857e887 // indirect
+	golang.org/x/net v0.0.0-20210614182718-04defd469f4e // indirect
+	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
-	honnef.co/go/tools v0.0.1-2020.1.3 // indirect
 	nhooyr.io/websocket v1.8.6 // indirect
 )

go.sum

@@ -44,6 +44,7 @@ github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbt
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/CurtisLusmore/ghp v0.0.0-20190131093722-04a23b486a62/go.mod h1:+iVlyn4r8pVe5rgooNlrYjuzDayoXL5H/JBMhemDs/I=
 github.com/DataDog/zstd v1.3.6-0.20190409195224-796139022798/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
 github.com/DataDog/zstd v1.4.1 h1:3oxKN3wbHibqx897utPC2LTQU4J+IHWWJO+glkAkpFM=
 github.com/DataDog/zstd v1.4.1/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
@@ -56,8 +57,8 @@ github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go
 github.com/Kubuxu/go-os-helper v0.0.1/go.mod h1:N8B+I7vPCT80IcP58r50u4+gEEcsZETFUpAzWW2ep1Y=
 github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
-github.com/Secured-Finance/go-libp2p-pex v1.1.0 h1:u+VQmzKmECZJTCkmUwQw0NGU1xHQIZjY7gYElLOxl0o=
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@@ -106,8 +107,8 @@ github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmV
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@@ -132,8 +133,9 @@ github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c/go.mod h1:3J08xEfcug
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@@ -178,7 +180,6 @@ github.com/cockroachdb/logtags v0.0.0-20190617123548-eb05cc24525f/go.mod h1:i/u9
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@@ -381,8 +382,9 @@ github.com/frankban/quicktest v1.11.3/go.mod h1:wRf/ReqHper53s+kmmSZizM8NamnL3IM
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@@ -949,8 +938,9 @@ github.com/libp2p/go-libp2p v0.8.3/go.mod h1:EsH1A+8yoWK+L4iKcbPYu6MPluZ+CHWI9El
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@@ -1010,8 +1000,8 @@ github.com/libp2p/go-libp2p-core v0.5.6/go.mod h1:txwbVEhHEXikXn9gfC7/UDDw7rkxuX
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@@ -1027,6 +1017,8 @@ github.com/libp2p/go-libp2p-discovery v0.3.0/go.mod h1:o03drFnz9BVAZdzC/QUQ+NeQO
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@@ -1047,8 +1039,10 @@ github.com/libp2p/go-libp2p-mplex v0.2.1/go.mod h1:SC99Rxs8Vuzrf/6WhmH41kNn13TiY
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@@ -1114,8 +1108,9 @@ github.com/libp2p/go-libp2p-swarm v0.2.4/go.mod h1:/xIpHFPPh3wmSthtxdGbkHZ0OET1h
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@@ -1123,8 +1118,9 @@ github.com/libp2p/go-libp2p-testing v0.0.4/go.mod h1:gvchhf3FQOtBdr+eFUABet5a4MB
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@@ -1145,8 +1142,10 @@ github.com/libp2p/go-libp2p-yamux v0.2.5/go.mod h1:Zpgj6arbyQrmZ3wxSZxfBmbdnWtbZ
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@@ -1157,8 +1156,9 @@ github.com/libp2p/go-mplex v0.0.4/go.mod h1:pK5yMLmOoBR1pNCqDlA2GQrdAVTMkqFalaTW
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@@ -1264,9 +1267,6 @@ github.com/mattn/go-runewidth v0.0.3/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzp
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@@ -1308,10 +1308,8 @@ github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh
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@@ -1332,8 +1330,9 @@ github.com/multiformats/go-multiaddr v0.2.0/go.mod h1:0nO36NvPpyV4QzvTLi/lafl2y9
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@@ -1453,6 +1452,8 @@ github.com/openzipkin/zipkin-go v0.2.1/go.mod h1:NaW6tEwdmWMaCDZzg8sh+IBNOxHMPnh
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@@ -1645,7 +1646,6 @@ github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94/go.mod h1:AZpEONHx3
 github.com/streadway/amqp v0.0.0-20190827072141-edfb9018d271/go.mod h1:AZpEONHx3DKn8O/DFsRAY58/XVQiIPMTMB1SddzLXVw=
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@@ -1682,11 +1682,15 @@ github.com/uber/jaeger-client-go v2.23.1+incompatible/go.mod h1:WVhlPFC8FDjOFMMW
 github.com/uber/jaeger-lib v1.5.1-0.20181102163054-1fc5c315e03c/go.mod h1:ComeNDZlWwrWnDv8aPp0Ba6+uUTzImX/AauajbLI56U=
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@@ -1708,6 +1712,8 @@ github.com/warpfork/go-wish v0.0.0-20180510122957-5ad1f5abf436/go.mod h1:x6AKhvS
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@@ -1778,7 +1784,6 @@ github.com/zondax/ledger-go v0.12.1/go.mod h1:KatxXrVDzgWwbssUWsF5+cOJHXPvzQ09YS
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@@ -1815,25 +1820,30 @@ go.uber.org/atomic v1.5.1/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
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-go4.org v0.0.0-20200411211856-f5505b9728dd h1:BNJlw5kRTzdmyfh5U8F93HA2OwkP7ZGwA51eJ/0wKOU=
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@@ -1842,6 +1852,7 @@ golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20181030102418-4d3f4d9ffa16/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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@@ -1876,8 +1887,8 @@ golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20201112155050-0c6587e931a9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
-golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b h1:7mWr3k41Qtv8XlltBkDkl8LoP3mpSgBW8BUoxtEdbXg=
-golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
+golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 h1:/UOmuWzQfxxo9UtlXMwuQU8CMgg1eZXqTRwkSQJWKOI=
+golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -1969,8 +1980,8 @@ golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb/go.mod h1:sp8m0HH+o8qH0wwXwY
 golang.org/x/net v0.0.0-20201209123823-ac852fbbde11/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20210428140749-89ef3d95e781 h1:DzZ89McO9/gWPsQXS/FVKAlG02ZjaQ6AlZRBimEYOd0=
-golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
+golang.org/x/net v0.0.0-20210614182718-04defd469f4e h1:XpT3nA5TvE525Ne3hInMh6+GETgn27Zfm9dxsThnX2Q=
+golang.org/x/net v0.0.0-20210614182718-04defd469f4e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181017192945-9dcd33a902f4/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181203162652-d668ce993890/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -2005,6 +2016,7 @@ golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190124100055-b90733256f2e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190204203706-41f3e6584952/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190219092855-153ac476189d/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -2073,8 +2085,9 @@ golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210303074136-134d130e1a04/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210309074719-68d13333faf2/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210426230700-d19ff857e887 h1:dXfMednGJh/SUUFjTLsWJz3P+TQt9qnR11GgeI3vWKs=
-golang.org/x/sys v0.0.0-20210426230700-d19ff857e887/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c h1:F1jZWGFhYfh0Ci55sIpILtKKK8p3i2/krTr0H1rg74I=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -2120,10 +2133,10 @@ golang.org/x/tools v0.0.0-20191030062658-86caa796c7ab/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20191108193012-7d206e10da11/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191112195655-aa38f8e97acc/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191113191852-77e3bb0ad9e7/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191114200427-caa0b0f7d508/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191115202509-3a792d9c32b2/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191125144606-a911d9008d1f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20191130070609-6e064ea0cf2d/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.0.0-20191216173652-a0e659d51361/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.0.0-20191227053925-7b8e75db28f4/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
@@ -2273,7 +2286,6 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -2282,8 +2294,6 @@ honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-honnef.co/go/tools v0.0.1-2020.1.3 h1:sXmLre5bzIR6ypkjXCDI3jHPssRhc8KD/Ome589sc3U=
-honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 howett.net/plist v0.0.0-20181124034731-591f970eefbb/go.mod h1:vMygbs4qMhSZSc4lCUl2OEE+rDiIIJAIdR4m7MiMcm0=
 modernc.org/cc v1.0.0 h1:nPibNuDEx6tvYrUAtvDTTw98rx5juGsa5zuDnKwEEQQ=
 modernc.org/cc v1.0.0/go.mod h1:1Sk4//wdnYJiUIxnW8ddKpaOJCF37yAdqYnkxUpaYxw=

node/flags.go

@@ -0,0 +1,6 @@
+package node
+
+type AppFlags struct {
+	ConfigPath string
+	Verbose    bool
+}

node/network_service.go

@@ -0,0 +1,95 @@
+package node
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/Secured-Finance/dione/blockchain"
+
+	gorpc "github.com/libp2p/go-libp2p-gorpc"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/Secured-Finance/dione/consensus/policy"
+	"github.com/Secured-Finance/dione/node/wire"
+
+	"github.com/Secured-Finance/dione/blockchain/pool"
+)
+
+type NetworkService struct {
+	blockchain *blockchain.BlockChain
+	mempool    *pool.Mempool
+	rpcClient  *gorpc.Client
+}
+
+func NewNetworkService(bc *blockchain.BlockChain, mp *pool.Mempool) *NetworkService {
+	return &NetworkService{
+		blockchain: bc,
+		mempool:    mp,
+	}
+}
+
+func (s *NetworkService) LastBlockHeight(ctx context.Context, arg struct{}, reply *wire.LastBlockHeightReply) error {
+	height, err := s.blockchain.GetLatestBlockHeight()
+	if err != nil {
+		return err
+	}
+	reply.Height = height
+	return nil
+}
+
+func (s *NetworkService) GetRangeOfBlocks(ctx context.Context, arg wire.GetRangeOfBlocksArg, reply *wire.GetRangeOfBlocksReply) error {
+	if arg.From > arg.To {
+		return fmt.Errorf("incorrect arguments: from > to")
+	}
+	if arg.To-arg.From > policy.MaxBlockCountForRetrieving {
+		return fmt.Errorf("incorrect arguments: count of block for retrieving is exceeded the limit")
+	}
+	for i := arg.From; i <= arg.To; i++ {
+		block, err := s.blockchain.FetchBlockByHeight(i)
+		if err != nil {
+			logrus.Warnf("failed to retrieve block from blockpool with height %d", i)
+			reply.FailedBlockHeights = append(reply.FailedBlockHeights, i)
+			continue
+		}
+		reply.Blocks = append(reply.Blocks, *block)
+	}
+	return nil
+}
+
+func (s *NetworkService) Mempool(ctx context.Context, arg struct{}, reply *wire.InvMessage) error {
+	txs := s.mempool.GetAllTransactions()
+
+	// extract hashes of txs
+	for _, v := range txs {
+		reply.Inventory = append(reply.Inventory, wire.InvItem{
+			Type: wire.TxInvType,
+			Hash: v.Hash,
+		})
+	}
+
+	return nil
+}
+
+func (s *NetworkService) GetMempoolTxs(ctx context.Context, arg wire.GetMempoolTxsArg, reply *wire.GetMempoolTxsReply) error {
+	if len(arg.Items) > policy.MaxTransactionCountForRetrieving {
+		pid, _ := gorpc.GetRequestSender(ctx)
+		logrus.Warnf("Max tx count limit exceeded for GetMempoolTxs request of node %s", pid)
+		return fmt.Errorf("max tx count limit exceeded")
+	}
+
+	for _, v := range arg.Items {
+		tx, err := s.mempool.GetTransaction(v)
+		if err != nil {
+			if errors.Is(err, pool.ErrTxNotFound) {
+				reply.NotFoundTxs = append(reply.NotFoundTxs, v)
+			} else {
+				return err
+			}
+		}
+		reply.Transactions = append(reply.Transactions, *tx)
+	}
+
+	return nil
+}

node/node.go

@@ -2,49 +2,37 @@ package node
 
 import (
 	"context"
-	"crypto/rand"
-	"flag"
-	"fmt"
-	"io/ioutil"
-	"os"
 	"time"
 
-	pex "github.com/Secured-Finance/go-libp2p-pex"
+	"github.com/Secured-Finance/dione/blockchain"
+
+	drand2 "github.com/Secured-Finance/dione/beacon/drand"
+
+	"github.com/Secured-Finance/dione/pubsub"
 
-	"github.com/Secured-Finance/dione/cache"
 	"github.com/Secured-Finance/dione/consensus"
 
-	pubsub "github.com/libp2p/go-libp2p-pubsub"
+	"github.com/Secured-Finance/dione/blockchain/sync"
 
-	"github.com/Secured-Finance/dione/drand"
+	"go.uber.org/fx"
 
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/libp2p/go-libp2p-core/peer"
+	"github.com/fxamacker/cbor/v2"
+
+	"github.com/Secured-Finance/dione/types"
+
+	types2 "github.com/Secured-Finance/dione/blockchain/types"
+
+	"github.com/Secured-Finance/dione/blockchain/pool"
 
 	"github.com/libp2p/go-libp2p-core/discovery"
 
 	"github.com/Secured-Finance/dione/rpc"
-	rtypes "github.com/Secured-Finance/dione/rpc/types"
-
-	solana2 "github.com/Secured-Finance/dione/rpc/solana"
-
-	"github.com/Secured-Finance/dione/rpc/filecoin"
-
-	"github.com/Secured-Finance/dione/types"
-
-	"github.com/Secured-Finance/dione/wallet"
 
 	"golang.org/x/xerrors"
 
-	"github.com/Secured-Finance/dione/beacon"
-
 	"github.com/Secured-Finance/dione/config"
 	"github.com/Secured-Finance/dione/ethclient"
-	pubsub2 "github.com/Secured-Finance/dione/pubsub"
-	"github.com/libp2p/go-libp2p"
-	crypto "github.com/libp2p/go-libp2p-core/crypto"
 	"github.com/libp2p/go-libp2p-core/host"
-	"github.com/multiformats/go-multiaddr"
 	"github.com/sirupsen/logrus"
 )
 
@@ -52,129 +40,58 @@ const (
 	DefaultPEXUpdateTime = 6 * time.Second
 )
 
-type Node struct {
-	Host             host.Host
-	PeerDiscovery    discovery.Discovery
-	PubSubRouter     *pubsub2.PubSubRouter
-	GlobalCtx        context.Context
-	GlobalCtxCancel  context.CancelFunc
-	Config           *config.Config
-	Ethereum         *ethclient.EthereumClient
-	ConsensusManager *consensus.PBFTConsensusManager
-	Miner            *consensus.Miner
-	Beacon           beacon.BeaconNetworks
-	Wallet           *wallet.LocalWallet
-	EventCache       cache.EventCache
-	DisputeManager   *consensus.DisputeManager
-}
+func runNode(
+	lc fx.Lifecycle,
+	cfg *config.Config,
+	disco discovery.Discovery,
+	ethClient *ethclient.EthereumClient,
+	h host.Host,
+	mp *pool.Mempool,
+	syncManager sync.SyncManager,
+	consensusManager *consensus.PBFTConsensusManager,
+	pubSubRouter *pubsub.PubSubRouter,
+	disputeManager *consensus.DisputeManager,
+	db *drand2.DrandBeacon,
+) {
+	lc.Append(fx.Hook{
+		OnStart: func(ctx context.Context) error {
+			err := runLibp2pAsync(context.TODO(), h, cfg, disco)
+			if err != nil {
+				return err
+			}
 
-func NewNode(config *config.Config, prvKey crypto.PrivKey, pexDiscoveryUpdateTime time.Duration) (*Node, error) {
-	n := &Node{
-		Config: config,
-	}
+			err = db.Run(context.TODO())
+			if err != nil {
+				return err
+			}
 
-	// initialize libp2p host
-	lhost, err := provideLibp2pHost(n.Config, prvKey, pexDiscoveryUpdateTime)
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	n.Host = lhost
-	logrus.Info("Started up Libp2p host!")
+			// Run pubsub router
+			pubSubRouter.Run()
 
-	// initialize ethereum client
-	ethClient, err := provideEthereumClient(n.Config)
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	n.Ethereum = ethClient
-	logrus.Info("Started up Ethereum client!")
+			// Subscribe on new requests event channel from Ethereum
+			err = subscribeOnEthContractsAsync(context.TODO(), ethClient, mp)
+			if err != nil {
+				return err
+			}
 
-	// initialize blockchain rpc clients
-	err = n.setupRPCClients()
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	logrus.Info("RPC clients has successfully configured!")
+			// Run blockchain sync manager
+			syncManager.Run()
 
-	// initialize pubsub subsystem
-	psb := providePubsubRouter(lhost, n.Config)
-	n.PubSubRouter = psb
-	logrus.Info("PubSub subsystem has initialized!")
+			// Run dispute manager
+			disputeManager.Run(context.TODO())
 
-	// initialize peer discovery
-	peerDiscovery, err := providePeerDiscovery(n.Config, lhost, pexDiscoveryUpdateTime)
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	n.PeerDiscovery = peerDiscovery
-	logrus.Info("Peer discovery subsystem has initialized!")
-
-	// get private key of libp2p host
-	rawPrivKey, err := prvKey.Raw()
-	if err != nil {
-		logrus.Fatal(err)
-	}
-
-	// initialize random beacon network subsystem
-	randomBeaconNetwork, err := provideBeacon(psb.Pubsub)
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	n.Beacon = randomBeaconNetwork
-	logrus.Info("Random beacon subsystem has initialized!")
-
-	// initialize mining subsystem
-	miner := provideMiner(n.Host.ID(), *n.Ethereum.GetEthAddress(), n.Beacon, n.Ethereum, rawPrivKey)
-	n.Miner = miner
-	logrus.Info("Mining subsystem has initialized!")
-
-	// initialize event log cache subsystem
-	eventCache := provideEventCache(config)
-	n.EventCache = eventCache
-	logrus.Info("Event cache subsystem has initialized!")
-
-	// initialize consensus subsystem
-	cManager := provideConsensusManager(psb, miner, ethClient, rawPrivKey, n.Config.ConsensusMinApprovals, eventCache)
-	n.ConsensusManager = cManager
-	logrus.Info("Consensus subsystem has initialized!")
-
-	// initialize dispute subsystem
-	disputeManager, err := provideDisputeManager(context.TODO(), ethClient, cManager, config)
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	n.DisputeManager = disputeManager
-	logrus.Info("Dispute subsystem has initialized!")
-
-	// initialize internal eth wallet
-	wallet, err := provideWallet(n.Host.ID(), rawPrivKey)
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	n.Wallet = wallet
-
-	return n, nil
-}
-
-func (n *Node) Run(ctx context.Context) error {
-	n.runLibp2pAsync(ctx)
-	n.subscribeOnEthContractsAsync(ctx)
-
-	for {
-		select {
-		case <-ctx.Done():
 			return nil
-		}
-	}
-
-	// return nil
+		},
+		OnStop: func(ctx context.Context) error {
+			// TODO
+			return nil
+		},
+	})
 }
 
-func (n *Node) runLibp2pAsync(ctx context.Context) error {
-	logrus.Info(fmt.Sprintf("[*] Your Multiaddress Is: /ip4/%s/tcp/%d/p2p/%s", n.Config.ListenAddr, n.Config.ListenPort, n.Host.ID().Pretty()))
-
+func runLibp2pAsync(ctx context.Context, h host.Host, cfg *config.Config, disco discovery.Discovery) error {
 	logrus.Info("Announcing ourselves...")
-	_, err := n.PeerDiscovery.Advertise(context.TODO(), n.Config.Rendezvous)
+	_, err := disco.Advertise(context.TODO(), cfg.Rendezvous)
 	if err != nil {
 		return xerrors.Errorf("failed to announce this node to the network: %v", err)
 	}
@@ -182,7 +99,7 @@ func (n *Node) runLibp2pAsync(ctx context.Context) error {
 
 	// Discover unbounded count of peers
 	logrus.Info("Searching for other peers...")
-	peerChan, err := n.PeerDiscovery.FindPeers(context.TODO(), n.Config.Rendezvous)
+	peerChan, err := disco.FindPeers(context.TODO(), cfg.Rendezvous)
 	if err != nil {
 		return xerrors.Errorf("failed to find new peers: %v", err)
 	}
@@ -197,15 +114,18 @@ func (n *Node) runLibp2pAsync(ctx context.Context) error {
 					if len(newPeer.Addrs) == 0 {
 						continue
 					}
-					if newPeer.ID.String() == n.Host.ID().String() {
+					if newPeer.ID.String() == h.ID().String() {
 						continue
 					}
-					logrus.Infof("Found peer: %s", newPeer)
+					logrus.WithField("peer", newPeer.ID).Info("Discovered new peer, connecting...")
 					// Connect to the peer
-					if err := n.Host.Connect(ctx, newPeer); err != nil {
-						logrus.Warn("Connection failed: ", err)
+					if err := h.Connect(ctx, newPeer); err != nil {
+						logrus.WithFields(logrus.Fields{
+							"peer": newPeer.ID,
+							"err":  err.Error(),
+						}).Warn("Connection with newly discovered peer has been failed")
 					}
-					logrus.Info("Connected to newly discovered peer: ", newPeer)
+					logrus.WithField("peer", newPeer.ID).Info("Connected to newly discovered peer")
 				}
 			}
 		}
@@ -213,10 +133,10 @@ func (n *Node) runLibp2pAsync(ctx context.Context) error {
 	return nil
 }
 
-func (n *Node) subscribeOnEthContractsAsync(ctx context.Context) {
-	eventChan, subscription, err := n.Ethereum.SubscribeOnOracleEvents(ctx)
+func subscribeOnEthContractsAsync(ctx context.Context, ethClient *ethclient.EthereumClient, mp *pool.Mempool) error {
+	eventChan, subscription, err := ethClient.SubscribeOnOracleEvents(ctx)
 	if err != nil {
-		logrus.Fatal("Couldn't subscribe on ethereum contracts, exiting... ", err)
+		return err
 	}
 
 	go func() {
@@ -225,222 +145,78 @@ func (n *Node) subscribeOnEthContractsAsync(ctx context.Context) {
 			select {
 			case event := <-eventChan:
 				{
-					err := n.EventCache.Store("request_"+event.ReqID.String(), event)
-					if err != nil {
-						logrus.Errorf("Failed to store new request event to event log cache: %v", err)
-					}
-
-					logrus.Info("Let's wait a little so that all nodes have time to receive the request and cache it")
-					time.Sleep(5 * time.Second)
-
-					task, err := n.Miner.MineTask(context.TODO(), event)
-					if err != nil {
-						logrus.Errorf("Failed to mine task: %v", err)
-					}
-					if task == nil {
+					rpcMethod := rpc.GetRPCMethod(event.OriginChain, event.RequestType)
+					if rpcMethod == nil {
+						logrus.Errorf("Invalid RPC method name/type %d/%s for oracle request %s", event.OriginChain, event.RequestType, event.ReqID.String())
 						continue
 					}
-					logrus.Infof("Proposed new Dione task with ID: %s", event.ReqID.String())
-					err = n.ConsensusManager.Propose(*task)
+					res, err := rpcMethod(event.RequestParams)
 					if err != nil {
-						logrus.Errorf("Failed to propose task: %w", err)
+						logrus.Errorf("Failed to invoke RPC method for oracle request %s: %s", event.ReqID.String(), err.Error())
+						continue
+					}
+					task := &types.DioneTask{
+						OriginChain:   event.OriginChain,
+						RequestType:   event.RequestType,
+						RequestParams: event.RequestParams,
+						Payload:       res,
+						RequestID:     event.ReqID.String(),
+					}
+					data, err := cbor.Marshal(task)
+					if err != nil {
+						logrus.Errorf("Failed to marshal RPC response for oracle request %s: %s", event.ReqID.String(), err.Error())
+						continue
+					}
+					tx := types2.CreateTransaction(data)
+					err = mp.StoreTx(tx)
+					if err != nil {
+						logrus.Errorf("Failed to store tx in mempool: %s", err.Error())
+						continue
 					}
 				}
 			case <-ctx.Done():
 				break EventLoop
-			case <-subscription.Err():
-				logrus.Fatal("Error with ethereum subscription, exiting... ", err)
+			case err := <-subscription.Err():
+				logrus.Fatalf("Error has occurred in subscription to Ethereum event channel: %s", err.Error())
 			}
 		}
 	}()
-}
-
-func provideEventCache(config *config.Config) cache.EventCache {
-	var backend cache.EventCache
-	switch config.CacheType {
-	case "in-memory":
-		backend = cache.NewEventLogCache()
-	case "redis":
-		backend = cache.NewEventRedisCache(config)
-	default:
-		backend = cache.NewEventLogCache()
-	}
-	return backend
-}
-
-func provideDisputeManager(ctx context.Context, ethClient *ethclient.EthereumClient, pcm *consensus.PBFTConsensusManager, cfg *config.Config) (*consensus.DisputeManager, error) {
-	return consensus.NewDisputeManager(ctx, ethClient, pcm, cfg.Ethereum.DisputeVoteWindow)
-}
-
-func provideMiner(peerID peer.ID, ethAddress common.Address, beacon beacon.BeaconNetworks, ethClient *ethclient.EthereumClient, privateKey []byte) *consensus.Miner {
-	return consensus.NewMiner(peerID, ethAddress, beacon, ethClient, privateKey)
-}
-
-func provideBeacon(ps *pubsub.PubSub) (beacon.BeaconNetworks, error) {
-	networks := beacon.BeaconNetworks{}
-	bc, err := drand.NewDrandBeacon(config.ChainGenesis, config.TaskEpochInterval, ps)
-	if err != nil {
-		return nil, fmt.Errorf("failed to setup drand beacon: %w", err)
-	}
-	networks = append(networks, beacon.BeaconNetwork{Start: types.DrandRound(config.ChainGenesis), Beacon: bc})
-	// NOTE: currently we use only one network
-	return networks, nil
-}
-
-// FIXME: do we really need this?
-func provideWallet(peerID peer.ID, privKey []byte) (*wallet.LocalWallet, error) {
-	// TODO make persistent keystore
-	kstore := wallet.NewMemKeyStore()
-	keyInfo := types.KeyInfo{
-		Type:       types.KTEd25519,
-		PrivateKey: privKey,
-	}
-
-	kstore.Put(wallet.KNamePrefix+peerID.String(), keyInfo)
-	w, err := wallet.NewWallet(kstore)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to setup wallet: %w", err)
-	}
-	return w, nil
-}
-
-func provideEthereumClient(config *config.Config) (*ethclient.EthereumClient, error) {
-	ethereum := ethclient.NewEthereumClient()
-	err := ethereum.Initialize(&config.Ethereum)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to initialize ethereum client: %v", err)
-	}
-	return ethereum, nil
-}
-
-func (n *Node) setupRPCClients() error {
-	fc := filecoin.NewLotusClient()
-	rpc.RegisterRPC(rtypes.RPCTypeFilecoin, map[string]func(string) ([]byte, error){
-		"getTransaction": fc.GetTransaction,
-		"getBlock":       fc.GetBlock,
-	})
-
-	sl := solana2.NewSolanaClient()
-	rpc.RegisterRPC(rtypes.RPCTypeSolana, map[string]func(string) ([]byte, error){
-		"getTransaction": sl.GetTransaction,
-	})
 
 	return nil
 }
 
-func providePubsubRouter(lhost host.Host, config *config.Config) *pubsub2.PubSubRouter {
-	return pubsub2.NewPubSubRouter(lhost, config.PubSub.ServiceTopicName, config.IsBootstrap)
-}
-
-func provideConsensusManager(psb *pubsub2.PubSubRouter, miner *consensus.Miner, ethClient *ethclient.EthereumClient, privateKey []byte, minApprovals int, evc cache.EventCache) *consensus.PBFTConsensusManager {
-	return consensus.NewPBFTConsensusManager(psb, minApprovals, privateKey, ethClient, miner, evc)
-}
-
-func provideLibp2pHost(config *config.Config, privateKey crypto.PrivKey, pexDiscoveryUpdateTime time.Duration) (host.Host, error) {
-	listenMultiAddr, err := multiaddr.NewMultiaddr(fmt.Sprintf("/ip4/%s/tcp/%d", config.ListenAddr, config.ListenPort))
-	if err != nil {
-		return nil, xerrors.Errorf("failed to parse multiaddress: %v", err)
-	}
-	host, err := libp2p.New(
-		context.TODO(),
-		libp2p.ListenAddrs(listenMultiAddr),
-		libp2p.Identity(privateKey),
-	)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to setup libp2p host: %v", err)
-	}
-
-	return host, nil
-}
-
-func providePeerDiscovery(config *config.Config, h host.Host, pexDiscoveryUpdateTime time.Duration) (discovery.Discovery, error) {
-	var bootstrapMaddrs []multiaddr.Multiaddr
-	for _, a := range config.BootstrapNodes {
-		maddr, err := multiaddr.NewMultiaddr(a)
-		if err != nil {
-			return nil, xerrors.Errorf("invalid multiaddress of bootstrap node: %v", err)
-		}
-		bootstrapMaddrs = append(bootstrapMaddrs, maddr)
-	}
-
-	if config.IsBootstrap {
-		bootstrapMaddrs = nil
-	}
-
-	pexDiscovery, err := pex.NewPEXDiscovery(h, bootstrapMaddrs, pexDiscoveryUpdateTime)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to setup pex pexDiscovery: %v", err)
-	}
-
-	return pexDiscovery, nil
-}
-
 func Start() {
-	configPath := flag.String("config", "", "Path to config")
-	verbose := flag.Bool("verbose", false, "Verbose logging")
-	flag.Parse()
-
-	if *configPath == "" {
-		logrus.Fatal("no config path provided")
-	}
-	cfg, err := config.NewConfig(*configPath)
-	if err != nil {
-		logrus.Fatalf("failed to load config: %v", err)
-	}
-
-	var privateKey crypto.PrivKey
-
-	if cfg.IsBootstrap {
-		if _, err := os.Stat(".bootstrap_privkey"); os.IsNotExist(err) {
-			privateKey, err = generatePrivateKey()
-			if err != nil {
-				logrus.Fatal(err)
-			}
-
-			f, _ := os.Create(".bootstrap_privkey")
-			r, _ := privateKey.Raw()
-			f.Write(r)
-		} else {
-			pkey, _ := ioutil.ReadFile(".bootstrap_privkey")
-			privateKey, _ = crypto.UnmarshalEd25519PrivateKey(pkey)
-		}
-	} else {
-		privateKey, err = generatePrivateKey()
-		if err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	node, err := NewNode(cfg, privateKey, DefaultPEXUpdateTime)
-	if err != nil {
-		logrus.Fatal(err)
-	}
-
-	// log
-	if *verbose {
-		logrus.SetLevel(logrus.DebugLevel)
-	} else {
-		logrus.SetLevel(logrus.DebugLevel)
-	}
-
-	//log.SetDebugLogging()
-
-	//ctx, ctxCancel := context.WithCancel(context.Background())
-	//node.GlobalCtx = ctx
-	//node.GlobalCtxCancel = ctxCancel
-
-	err = node.Run(context.TODO())
-	if err != nil {
-		logrus.Fatal(err)
-	}
-}
-
-func generatePrivateKey() (crypto.PrivKey, error) {
-	r := rand.Reader
-	// Creates a new RSA key pair for this host.
-	prvKey, _, err := crypto.GenerateKeyPairWithReader(crypto.Ed25519, 2048, r)
-	if err != nil {
-		return nil, err
-	}
-	return prvKey, nil
+	fx.New(
+		fx.Provide(
+			provideEventBus,
+			provideAppFlags,
+			provideConfig,
+			providePrivateKey,
+			provideLibp2pHost,
+			provideEthereumClient,
+			providePubsubRouter,
+			provideBootstrapAddrs,
+			providePeerDiscovery,
+			provideDrandBeacon,
+			provideMempool,
+			blockchain.NewMiner,
+			provideBlockChain,
+			provideBlockPool,
+			provideSyncManager,
+			provideNetworkRPCHost,
+			provideNetworkService,
+			provideDirectRPCClient,
+			provideConsensusManager,
+			provideDisputeManager,
+		),
+		fx.Invoke(
+			configureLogger,
+			configureDirectRPC,
+			configureForeignBlockchainRPC,
+			initializeBlockchain,
+			configureMiner,
+			runNode,
+		),
+		fx.NopLogger,
+	).Run()
 }

node/node_dep_providers.go

@@ -0,0 +1,413 @@
+package node
+
+import (
+	"context"
+	"crypto/rand"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+	"runtime"
+
+	types2 "github.com/Secured-Finance/dione/blockchain/types"
+
+	"github.com/Secured-Finance/dione/rpc"
+	"github.com/Secured-Finance/dione/rpc/filecoin"
+	solana2 "github.com/Secured-Finance/dione/rpc/solana"
+	rtypes "github.com/Secured-Finance/dione/rpc/types"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/asaskevich/EventBus"
+
+	"github.com/Secured-Finance/dione/blockchain"
+
+	drand2 "github.com/Secured-Finance/dione/beacon/drand"
+
+	"github.com/libp2p/go-libp2p-core/protocol"
+
+	gorpc "github.com/libp2p/go-libp2p-gorpc"
+
+	"github.com/Secured-Finance/dione/blockchain/sync"
+
+	"github.com/Secured-Finance/dione/blockchain/pool"
+
+	"github.com/Secured-Finance/dione/cache"
+	"github.com/Secured-Finance/dione/config"
+	"github.com/Secured-Finance/dione/consensus"
+	"github.com/Secured-Finance/dione/ethclient"
+	"github.com/Secured-Finance/dione/pubsub"
+	"github.com/Secured-Finance/dione/types"
+	"github.com/Secured-Finance/dione/wallet"
+	pex "github.com/Secured-Finance/go-libp2p-pex"
+	"github.com/libp2p/go-libp2p"
+	"github.com/libp2p/go-libp2p-core/crypto"
+	"github.com/libp2p/go-libp2p-core/discovery"
+	"github.com/libp2p/go-libp2p-core/host"
+	"github.com/libp2p/go-libp2p-core/peer"
+	"github.com/multiformats/go-multiaddr"
+	"golang.org/x/xerrors"
+)
+
+const (
+	DioneProtocolID = protocol.ID("/dione/1.0")
+)
+
+func provideCache(config *config.Config) cache.Cache {
+	var backend cache.Cache
+	switch config.CacheType {
+	case "in-memory":
+		backend = cache.NewInMemoryCache()
+	case "redis":
+		backend = cache.NewRedisCache(config)
+	default:
+		backend = cache.NewInMemoryCache()
+	}
+	return backend
+}
+
+func provideDisputeManager(ethClient *ethclient.EthereumClient, pcm *consensus.PBFTConsensusManager, cfg *config.Config, bc *blockchain.BlockChain) *consensus.DisputeManager {
+	dm, err := consensus.NewDisputeManager(context.TODO(), ethClient, pcm, cfg.Ethereum.DisputeVoteWindow, bc)
+	if err != nil {
+		logrus.Fatal(err)
+	}
+
+	logrus.Info("Dispute subsystem has been initialized!")
+
+	return dm
+}
+
+func provideDrandBeacon(ps *pubsub.PubSubRouter, bus EventBus.Bus) *drand2.DrandBeacon {
+	db, err := drand2.NewDrandBeacon(ps.Pubsub, bus)
+	if err != nil {
+		logrus.Fatalf("Failed to setup drand beacon: %s", err)
+	}
+	logrus.Info("DRAND beacon subsystem has been initialized!")
+	return db
+}
+
+// FIXME: do we really need this?
+func provideWallet(peerID peer.ID, privKey []byte) (*wallet.LocalWallet, error) {
+	// TODO make persistent keystore
+	kstore := wallet.NewMemKeyStore()
+	keyInfo := types.KeyInfo{
+		Type:       types.KTEd25519,
+		PrivateKey: privKey,
+	}
+
+	kstore.Put(wallet.KNamePrefix+peerID.String(), keyInfo)
+	w, err := wallet.NewWallet(kstore)
+	if err != nil {
+		return nil, xerrors.Errorf("failed to setup wallet: %w", err)
+	}
+	return w, nil
+}
+
+func provideEthereumClient(config *config.Config) *ethclient.EthereumClient {
+	ethereum := ethclient.NewEthereumClient()
+	err := ethereum.Initialize(&config.Ethereum)
+	if err != nil {
+		logrus.Fatal(err)
+	}
+
+	logrus.WithField("ethAddress", ethereum.GetEthAddress().Hex()).Info("Ethereum client has been initialized!")
+
+	return ethereum
+}
+
+func providePubsubRouter(lhost host.Host, config *config.Config) *pubsub.PubSubRouter {
+	psb := pubsub.NewPubSubRouter(lhost, config.PubSub.ServiceTopicName, config.IsBootstrap)
+	logrus.Info("PubSub subsystem has been initialized!")
+	return psb
+}
+
+func provideConsensusManager(
+	h host.Host,
+	bus EventBus.Bus,
+	psb *pubsub.PubSubRouter,
+	miner *blockchain.Miner,
+	bc *blockchain.BlockChain,
+	ethClient *ethclient.EthereumClient,
+	privateKey crypto.PrivKey,
+	bp *consensus.ConsensusStatePool,
+	db *drand2.DrandBeacon,
+	mp *pool.Mempool,
+) *consensus.PBFTConsensusManager {
+	c := consensus.NewPBFTConsensusManager(
+		bus,
+		psb,
+		privateKey,
+		ethClient,
+		miner,
+		bc,
+		bp,
+		db,
+		mp,
+		h.ID(),
+	)
+	logrus.Info("Consensus subsystem has been initialized!")
+	return c
+}
+
+func provideLibp2pHost(config *config.Config, privateKey crypto.PrivKey) host.Host {
+	listenMultiAddr, err := multiaddr.NewMultiaddr(fmt.Sprintf("/ip4/%s/tcp/%d", config.ListenAddr, config.ListenPort))
+	if err != nil {
+		logrus.Fatalf("Failed to parse multiaddress: %s", err.Error())
+	}
+	libp2pHost, err := libp2p.New(
+		context.TODO(),
+		libp2p.ListenAddrs(listenMultiAddr),
+		libp2p.Identity(privateKey),
+	)
+	if err != nil {
+		logrus.Fatal(err)
+	}
+
+	logrus.WithField(
+		"multiaddress",
+		fmt.Sprintf("/ip4/%s/tcp/%d/p2p/%s",
+			config.ListenAddr,
+			config.ListenPort,
+			libp2pHost.ID().Pretty(),
+		)).Info("Libp2p host has been initialized!")
+
+	return libp2pHost
+}
+
+func provideNetworkRPCHost(h host.Host) *gorpc.Server {
+	return gorpc.NewServer(h, DioneProtocolID)
+}
+
+func provideBootstrapAddrs(c *config.Config) []multiaddr.Multiaddr {
+	if c.IsBootstrap {
+		return nil
+	}
+
+	var bootstrapMaddrs []multiaddr.Multiaddr
+	for _, a := range c.BootstrapNodes {
+		maddr, err := multiaddr.NewMultiaddr(a)
+		if err != nil {
+			logrus.Fatalf("Invalid multiaddress of bootstrap node: %v", err)
+		}
+		bootstrapMaddrs = append(bootstrapMaddrs, maddr)
+	}
+
+	return bootstrapMaddrs
+}
+
+func providePeerDiscovery(baddrs []multiaddr.Multiaddr, h host.Host) discovery.Discovery {
+	pexDiscovery, err := pex.NewPEXDiscovery(h, baddrs, DefaultPEXUpdateTime)
+	if err != nil {
+		logrus.Fatalf("Failed to setup libp2p PEX discovery: %s", err.Error())
+	}
+
+	logrus.Info("Peer discovery subsystem has been initialized!")
+
+	return pexDiscovery
+}
+
+func provideBlockChain(config *config.Config, bus EventBus.Bus, miner *blockchain.Miner, db *drand2.DrandBeacon) *blockchain.BlockChain {
+	bc, err := blockchain.NewBlockChain(config.Blockchain.DatabasePath, bus, miner, db)
+	if err != nil {
+		logrus.Fatalf("Failed to initialize blockchain storage: %s", err.Error())
+	}
+	logrus.Info("Blockchain storage has been successfully initialized!")
+
+	return bc
+}
+
+func provideMempool(bus EventBus.Bus) *pool.Mempool {
+	mp, err := pool.NewMempool(bus)
+	if err != nil {
+		logrus.Fatalf("Failed to initialize mempool: %s", err.Error())
+	}
+
+	logrus.Info("Mempool has been successfully initialized!")
+
+	return mp
+}
+
+func provideSyncManager(
+	bus EventBus.Bus,
+	bp *blockchain.BlockChain,
+	mp *pool.Mempool,
+	c *gorpc.Client,
+	bootstrapAddresses []multiaddr.Multiaddr,
+	psb *pubsub.PubSubRouter,
+) sync.SyncManager {
+	bootstrapPeerID := peer.ID("")
+
+	if bootstrapAddresses != nil {
+		addr, err := peer.AddrInfoFromP2pAddr(bootstrapAddresses[0]) // FIXME
+		if err != nil {
+			logrus.Fatal(err)
+		}
+		bootstrapPeerID = addr.ID
+	}
+
+	sm := sync.NewSyncManager(bus, bp, mp, c, bootstrapPeerID, psb)
+	logrus.Info("Blockchain sync subsystem has been successfully initialized!")
+
+	return sm
+}
+
+func provideDirectRPCClient(h host.Host) *gorpc.Client {
+	return gorpc.NewClient(h, DioneProtocolID)
+}
+
+func provideNetworkService(bp *blockchain.BlockChain, mp *pool.Mempool) *NetworkService {
+	ns := NewNetworkService(bp, mp)
+	logrus.Info("Direct RPC has been successfully initialized!")
+	return ns
+}
+
+func provideBlockPool(mp *pool.Mempool, bus EventBus.Bus, config *config.Config) *consensus.ConsensusStatePool {
+	bp, err := consensus.NewConsensusRoundPool(mp, bus, config.ConsensusMinApprovals)
+	if err != nil {
+		logrus.Fatalf("Failed to initialize blockpool: %s", err.Error())
+	}
+	logrus.Info("Consensus state pool has been successfully initialized!")
+	return bp
+}
+
+func provideEventBus() EventBus.Bus {
+	return EventBus.New()
+}
+
+func provideAppFlags() *AppFlags {
+	var flags AppFlags
+
+	flag.StringVar(&flags.ConfigPath, "config", "", "Path to config")
+	flag.BoolVar(&flags.Verbose, "verbose", false, "Verbose logging")
+
+	flag.Parse()
+
+	return &flags
+}
+
+func provideConfig(flags *AppFlags) *config.Config {
+	if flags.ConfigPath == "" {
+		logrus.Fatal("no config path provided")
+
+	}
+
+	cfg, err := config.NewConfig(flags.ConfigPath)
+	if err != nil {
+		logrus.Fatalf("failed to load config: %v", err)
+	}
+
+	return cfg
+}
+
+func providePrivateKey(cfg *config.Config) crypto.PrivKey {
+	var privateKey crypto.PrivKey
+
+	if _, err := os.Stat(cfg.PrivateKeyPath); os.IsNotExist(err) {
+		privateKey, err = generatePrivateKey()
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		dirName := filepath.Dir(cfg.PrivateKeyPath)
+		if _, err := os.Stat(dirName); os.IsNotExist(err) {
+			err := os.MkdirAll(dirName, 0755)
+			if err != nil {
+				logrus.Fatalf("Cannot create private key file: %s", err.Error())
+			}
+		}
+
+		f, err := os.Create(cfg.PrivateKeyPath)
+		if err != nil {
+			logrus.Fatalf("Cannot create private key file: %s, ", err)
+		}
+
+		r, err := privateKey.Raw()
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		_, err = f.Write(r)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+	} else {
+		pkey, err := ioutil.ReadFile(cfg.PrivateKeyPath)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		privateKey, err = crypto.UnmarshalEd25519PrivateKey(pkey)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+	}
+
+	return privateKey
+}
+
+func generatePrivateKey() (crypto.PrivKey, error) {
+	r := rand.Reader
+	// Creates a new RSA key pair for this host.
+	prvKey, _, err := crypto.GenerateKeyPairWithReader(crypto.Ed25519, 2048, r)
+	if err != nil {
+		return nil, err
+	}
+	return prvKey, nil
+}
+
+func configureDirectRPC(rpcServer *gorpc.Server, ns *NetworkService) {
+	err := rpcServer.Register(ns)
+	if err != nil {
+		logrus.Fatal(err)
+	}
+}
+
+func configureLogger(flags *AppFlags) {
+	logrus.SetReportCaller(true)
+	logrus.SetFormatter(&logrus.TextFormatter{
+		FullTimestamp: true,
+		CallerPrettyfier: func(f *runtime.Frame) (string, string) {
+			filename := path.Base(f.File)
+			return "", fmt.Sprintf("%s:%d:", filename, f.Line)
+		},
+	})
+
+	if flags.Verbose {
+		logrus.SetLevel(logrus.DebugLevel)
+	} else {
+		logrus.SetLevel(logrus.InfoLevel)
+	}
+}
+
+func configureForeignBlockchainRPC() {
+	fc := filecoin.NewLotusClient()
+	rpc.RegisterRPC(rtypes.RPCTypeFilecoin, map[string]func(string) ([]byte, error){
+		"getTransaction": fc.GetTransaction,
+		"getBlock":       fc.GetBlock,
+	})
+
+	sl := solana2.NewSolanaClient()
+	rpc.RegisterRPC(rtypes.RPCTypeSolana, map[string]func(string) ([]byte, error){
+		"getTransaction": sl.GetTransaction,
+	})
+
+	logrus.Info("Foreign Blockchain RPC clients has been successfully configured!")
+}
+
+func configureMiner(m *blockchain.Miner, b *blockchain.BlockChain) {
+	m.SetBlockchainInstance(b)
+}
+
+func initializeBlockchain(bc *blockchain.BlockChain) {
+	_, err := bc.GetLatestBlockHeight()
+	if err == blockchain.ErrLatestHeightNil {
+		gBlock := types2.GenesisBlock()
+		err = bc.StoreBlock(gBlock) // commit genesis block
+		if err != nil {
+			logrus.Fatal(err)
+		}
+		logrus.Info("Committed genesis block")
+	}
+}

node/wire/get_mempool_tx.go

@@ -0,0 +1,12 @@
+package wire
+
+import "github.com/Secured-Finance/dione/blockchain/types"
+
+type GetMempoolTxsArg struct {
+	Items [][]byte
+}
+
+type GetMempoolTxsReply struct {
+	Transactions []types.Transaction
+	NotFoundTxs  [][]byte
+}

node/wire/get_range_of_blocks.go

@@ -0,0 +1,13 @@
+package wire
+
+import "github.com/Secured-Finance/dione/blockchain/types"
+
+type GetRangeOfBlocksArg struct {
+	From uint64
+	To   uint64
+}
+
+type GetRangeOfBlocksReply struct {
+	Blocks             []types.Block
+	FailedBlockHeights []uint64 // list of block heights the node was unable to retrieve
+}

node/wire/inv.go

@@ -0,0 +1,17 @@
+package wire
+
+type InvType int
+
+const (
+	InvalidInvType = iota
+	TxInvType
+)
+
+type InvMessage struct {
+	Inventory []InvItem
+}
+
+type InvItem struct {
+	Type InvType
+	Hash []byte
+}

node/wire/last_block_height.go

@@ -0,0 +1,5 @@
+package wire
+
+type LastBlockHeightReply struct {
+	Height uint64
+}

pubsub/handler.go

@@ -1,7 +0,0 @@
-package pubsub
-
-import (
-	"github.com/Secured-Finance/dione/consensus/types"
-)
-
-type Handler func(message *types.Message)

pubsub/message.go

@@ -0,0 +1,20 @@
+package pubsub
+
+import "github.com/libp2p/go-libp2p-core/peer"
+
+type PubSubMessageType int
+
+const (
+	UnknownMessageType = iota
+	PrePrepareMessageType
+	PrepareMessageType
+	CommitMessageType
+	NewTxMessageType
+	NewBlockMessageType
+)
+
+type PubSubMessage struct {
+	Type    PubSubMessageType
+	From    peer.ID `cbor:"-"`
+	Payload []byte
+}

pubsub/pubsub_router.go

@@ -2,14 +2,11 @@ package pubsub
 
 import (
 	"context"
-	"time"
 
 	"github.com/fxamacker/cbor/v2"
 
-	"github.com/Secured-Finance/dione/consensus/types"
-
-	host "github.com/libp2p/go-libp2p-core/host"
-	peer "github.com/libp2p/go-libp2p-core/peer"
+	"github.com/libp2p/go-libp2p-core/host"
+	"github.com/libp2p/go-libp2p-core/peer"
 	pubsub "github.com/libp2p/go-libp2p-pubsub"
 	"github.com/sirupsen/logrus"
 )
@@ -20,38 +17,41 @@ type PubSubRouter struct {
 	context             context.Context
 	contextCancel       context.CancelFunc
 	serviceSubscription *pubsub.Subscription
-	handlers            map[types.MessageType][]Handler
+	handlers            map[PubSubMessageType][]Handler
 	oracleTopicName     string
 	oracleTopic         *pubsub.Topic
 }
 
+type Handler func(message *PubSubMessage)
+
 func NewPubSubRouter(h host.Host, oracleTopic string, isBootstrap bool) *PubSubRouter {
 	ctx, ctxCancel := context.WithCancel(context.Background())
 
 	psr := &PubSubRouter{
-		node:          h,
-		context:       ctx,
-		contextCancel: ctxCancel,
-		handlers:      make(map[types.MessageType][]Handler),
+		node:            h,
+		context:         ctx,
+		contextCancel:   ctxCancel,
+		handlers:        make(map[PubSubMessageType][]Handler),
+		oracleTopicName: oracleTopic,
 	}
 
 	var pbOptions []pubsub.Option
 
 	if isBootstrap {
 		// turn off the mesh in bootstrappers -- only do gossip and PX
-		pubsub.GossipSubD = 0
-		pubsub.GossipSubDscore = 0
-		pubsub.GossipSubDlo = 0
-		pubsub.GossipSubDhi = 0
-		pubsub.GossipSubDout = 0
-		pubsub.GossipSubDlazy = 64
-		pubsub.GossipSubGossipFactor = 0.25
-		pubsub.GossipSubPruneBackoff = 5 * time.Minute
+		//pubsub.GossipSubD = 0
+		//pubsub.GossipSubDscore = 0
+		//pubsub.GossipSubDlo = 0
+		//pubsub.GossipSubDhi = 0
+		//pubsub.GossipSubDout = 0
+		//pubsub.GossipSubDlazy = 64
+		//pubsub.GossipSubGossipFactor = 0.25
+		//pubsub.GossipSubPruneBackoff = 5 * time.Minute
 		// turn on PX
-		pbOptions = append(pbOptions, pubsub.WithPeerExchange(true))
+		//pbOptions = append(pbOptions, pubsub.WithPeerExchange(true))
 	}
 
-	pb, err := pubsub.NewGossipSub(
+	pb, err := pubsub.NewFloodSub(
 		context.TODO(),
 		psr.node,
 		pbOptions...,
@@ -61,7 +61,6 @@ func NewPubSubRouter(h host.Host, oracleTopic string, isBootstrap bool) *PubSubR
 		logrus.Fatalf("Error occurred when initializing PubSub subsystem: %v", err)
 	}
 
-	psr.oracleTopicName = oracleTopic
 	topic, err := pb.Join(oracleTopic)
 	if err != nil {
 		logrus.Fatalf("Error occurred when subscribing to service topic: %v", err)
@@ -72,6 +71,10 @@ func NewPubSubRouter(h host.Host, oracleTopic string, isBootstrap bool) *PubSubR
 	psr.Pubsub = pb
 	psr.oracleTopic = topic
 
+	return psr
+}
+
+func (psr *PubSubRouter) Run() {
 	go func() {
 		for {
 			select {
@@ -79,7 +82,7 @@ func NewPubSubRouter(h host.Host, oracleTopic string, isBootstrap bool) *PubSubR
 				return
 			default:
 				{
-					msg, err := subscription.Next(psr.context)
+					msg, err := psr.serviceSubscription.Next(psr.context)
 					if err != nil {
 						logrus.Warnf("Failed to receive pubsub message: %v", err)
 					}
@@ -88,8 +91,6 @@ func NewPubSubRouter(h host.Host, oracleTopic string, isBootstrap bool) *PubSubR
 			}
 		}
 	}()
-
-	return psr
 }
 
 func (psr *PubSubRouter) handleMessage(p *pubsub.Message) {
@@ -102,16 +103,16 @@ func (psr *PubSubRouter) handleMessage(p *pubsub.Message) {
 	if senderPeerID == psr.node.ID() {
 		return
 	}
-	var message types.Message
+	var message PubSubMessage
 	err = cbor.Unmarshal(p.Data, &message)
 	if err != nil {
-		logrus.Warn("Unable to decode message data! " + err.Error())
+		logrus.Warn("Unable to decode pubsub message data! " + err.Error())
 		return
 	}
 	message.From = senderPeerID
 	handlers, ok := psr.handlers[message.Type]
 	if !ok {
-		logrus.Warn("Dropping message " + string(message.Type) + " because we don't have any handlers!")
+		logrus.Warnf("Dropping pubsub message with type %d because we don't have any handlers!", message.Type)
 		return
 	}
 	for _, v := range handlers {
@@ -119,7 +120,7 @@ func (psr *PubSubRouter) handleMessage(p *pubsub.Message) {
 	}
 }
 
-func (psr *PubSubRouter) Hook(messageType types.MessageType, handler Handler) {
+func (psr *PubSubRouter) Hook(messageType PubSubMessageType, handler Handler) {
 	_, ok := psr.handlers[messageType]
 	if !ok {
 		psr.handlers[messageType] = []Handler{}
@@ -127,7 +128,7 @@ func (psr *PubSubRouter) Hook(messageType types.MessageType, handler Handler) {
 	psr.handlers[messageType] = append(psr.handlers[messageType], handler)
 }
 
-func (psr *PubSubRouter) BroadcastToServiceTopic(msg *types.Message) error {
+func (psr *PubSubRouter) BroadcastToServiceTopic(msg *PubSubMessage) error {
 	data, err := cbor.Marshal(msg)
 	if err != nil {
 		return err

rpc/filecoin/filecoin.go

@@ -114,6 +114,6 @@ func (c *LotusClient) HandleRequest(method string, params []interface{}) ([]byte
 		return nil, err
 	}
 	bodyBytes := resp.Body()
-	logrus.Debugf("Filecoin RPC reply: %v", string(bodyBytes))
+	logrus.Tracef("Filecoin RPC reply: %v", string(bodyBytes))
 	return bodyBytes, nil
 }

store/stake.go

@@ -1,96 +0,0 @@
-package store
-
-import (
-	"time"
-
-	"github.com/Secured-Finance/dione/ethclient"
-	"github.com/Secured-Finance/dione/lib"
-	"github.com/Secured-Finance/dione/types"
-	"github.com/ethereum/go-ethereum/common"
-	validation "github.com/go-ozzo/ozzo-validation"
-)
-
-type DioneStakeInfo struct {
-	ID             int
-	MinerStake     *types.BigInt
-	TotalStake     *types.BigInt
-	MinerAddress   string
-	MinerEthWallet string
-	Timestamp      time.Time
-	Ethereum       *ethclient.EthereumClient
-}
-
-func NewDioneStakeInfo(minerStake, totalStake *types.BigInt, minerWallet, minerEthWallet string, ethereumClient *ethclient.EthereumClient) *DioneStakeInfo {
-	return &DioneStakeInfo{
-		MinerStake:     minerStake,
-		TotalStake:     totalStake,
-		MinerAddress:   minerWallet,
-		MinerEthWallet: minerEthWallet,
-		Ethereum:       ethereumClient,
-	}
-}
-
-func (d *DioneStakeInfo) UpdateMinerStake(minerEthAddress common.Address) error {
-	minerStake, err := d.Ethereum.GetMinerStake(minerEthAddress)
-	if err != nil {
-		return err
-	}
-
-	d.MinerStake = minerStake
-
-	return nil
-}
-
-func (d *DioneStakeInfo) UpdateTotalStake() error {
-	totalStake, err := d.Ethereum.GetTotalStake()
-	if err != nil {
-		return err
-	}
-
-	d.TotalStake = totalStake
-
-	return nil
-}
-
-// Put miner's staking information into the database
-func (s *Store) CreateDioneStakeInfo(stakeStore *DioneStakeInfo) error {
-
-	if err := stakeStore.Validate(); err != nil {
-		return err
-	}
-
-	now := lib.Clock.Now()
-
-	return s.db.QueryRow(
-		"INSERT INTO staking (miner_stake, total_stake, miner_address, miner_eth_wallet, timestamp) VALUES ($1, $2, $3, $4, $5) RETURNING id",
-		stakeStore.MinerStake,
-		stakeStore.TotalStake,
-		stakeStore.MinerAddress,
-		stakeStore.MinerEthWallet,
-		now,
-	).Scan(&stakeStore.ID)
-}
-
-func (s *Store) GetLastStakeInfo(wallet, ethWallet string) (*DioneStakeInfo, error) {
-	var stake *DioneStakeInfo
-	if err := s.db.Select(&stake,
-		`SELECT miner_stake, total_stake, miner_address, miner_eth_wallet, timestamp FROM staking ORDER BY TIMESTAMP DESC LIMIT 1 WHERE miner_address=$1, miner_eth_wallet=$2`,
-		wallet,
-		ethWallet,
-	); err != nil {
-		return nil, err
-	}
-
-	return stake, nil
-}
-
-// Before puting the data into the database validating all required fields
-func (s *DioneStakeInfo) Validate() error {
-	return validation.ValidateStruct(
-		s,
-		validation.Field(&s.MinerStake, validation.Required, validation.By(types.ValidateBigInt(s.MinerStake.Int))),
-		validation.Field(&s.TotalStake, validation.Required, validation.By(types.ValidateBigInt(s.TotalStake.Int))),
-		validation.Field(&s.MinerAddress, validation.Required),
-		validation.Field(&s.MinerEthWallet, validation.Required),
-	)
-}

store/store.go

@@ -1,46 +1,44 @@
 package store
 
-import (
-	"github.com/Secured-Finance/dione/node"
-	"github.com/jmoiron/sqlx"
-	_ "github.com/mattn/go-sqlite3"
-)
-
-type Store struct {
-	db           *sqlx.DB
-	node         *node.Node
-	genesisTs    uint64
-	StakeStorage DioneStakeInfo
-	// genesisTask *types.DioneTask
-}
-
-func NewStore(node *node.Node, genesisTs uint64) (*Store, error) {
-	db, err := newDB(node.Config.Store.DatabaseURL)
-	if err != nil {
-		return nil, err
-	}
-
-	defer db.Close()
-
-	return &Store{
-		db:        db,
-		node:      node,
-		genesisTs: genesisTs,
-	}, nil
-}
-
-func newDB(databaseURL string) (*sqlx.DB, error) {
-	db, err := sqlx.Connect("sqlite3", databaseURL)
-	if err != nil {
-		return nil, err
-	}
-
-	if err := db.Ping(); err != nil {
-		return nil, err
-	}
-
-	return db, nil
-}
-
+//import (
+//	"github.com/Secured-Finance/dione/node"
+//	"github.com/jmoiron/sqlx"
+//	_ "github.com/mattn/go-sqlite3"
+//)
+//
+//type Store struct {
+//	db        *sqlx.DB
+//	node      *node.Node
+//	genesisTs uint64
+//}
+//
+//func NewStore(node *node.Node, genesisTs uint64) (*Store, error) {
+//	db, err := newDB(node.Config.Store.DatabaseURL)
+//	if err != nil {
+//		return nil, err
+//	}
+//
+//	defer db.Close()
+//
+//	return &Store{
+//		db:        db,
+//		node:      node,
+//		genesisTs: genesisTs,
+//	}, nil
+//}
+//
+//func newDB(databaseURL string) (*sqlx.DB, error) {
+//	db, err := sqlx.Connect("sqlite3", databaseURL)
+//	if err != nil {
+//		return nil, err
+//	}
+//
+//	if err := db.Ping(); err != nil {
+//		return nil, err
+//	}
+//
+//	return db, nil
+//}
+//
 //	TODO: Discuss with ChronosX88 about using custom database to decrease I/O bound
-// 	specify the migrations for stake storage;
+//	specify the migrations for stake storage;

types/beacon.go

@@ -1,15 +1,15 @@
 package types
 
 type BeaconEntry struct {
-	Round uint64
-	Data  []byte
+	Round    uint64
+	Data     []byte
+	Metadata map[string]interface{}
 }
 
-type Randomness []byte
-
-func NewBeaconEntry(round uint64, data []byte) BeaconEntry {
+func NewBeaconEntry(round uint64, data []byte, metadata map[string]interface{}) BeaconEntry {
 	return BeaconEntry{
-		Round: round,
-		Data:  data,
+		Round:    round,
+		Data:     data,
+		Metadata: metadata,
 	}
 }

types/bigint.go

@@ -1,32 +0,0 @@
-package types
-
-import (
-	"errors"
-	"math/big"
-
-	big2 "github.com/filecoin-project/go-state-types/big"
-	validation "github.com/go-ozzo/ozzo-validation"
-)
-
-var EmptyInt = BigInt{}
-
-type BigInt = big2.Int
-
-func NewInt(i uint64) BigInt {
-	return BigInt{Int: big.NewInt(0).SetUint64(i)}
-}
-
-func BigFromBytes(b []byte) BigInt {
-	i := big.NewInt(0).SetBytes(b)
-	return BigInt{Int: i}
-}
-
-func ValidateBigInt(i *big.Int) validation.RuleFunc {
-	return func(value interface{}) error {
-		bigInt := i.IsInt64()
-		if !bigInt {
-			return errors.New("expected big integer")
-		}
-		return nil
-	}
-}

types/electionproof.go

@@ -8,8 +8,9 @@ import (
 )
 
 type ElectionProof struct {
-	WinCount int64
-	VRFProof []byte
+	WinCount        int64
+	VRFProof        []byte
+	RandomnessRound uint64
 }
 
 const precision = 256
@@ -99,13 +100,13 @@ func polyval(p []*big.Int, x *big.Int) *big.Int {
 
 // computes lambda in Q.256
 func lambda(power, totalPower *big.Int) *big.Int {
-	lam := new(big.Int).Mul(power, tasksPerEpoch.Int)    // Q.0
-	lam = lam.Lsh(lam, precision)                        // Q.256
-	lam = lam.Div(lam /* Q.256 */, totalPower /* Q.0 */) // Q.256
+	lam := new(big.Int).Mul(power, config.ExpectedLeadersPerEpoch) // Q.0
+	lam = lam.Lsh(lam, precision)                                  // Q.256
+	lam = lam.Div(lam /* Q.256 */, totalPower /* Q.0 */)           // Q.256
 	return lam
 }
 
-var MaxWinCount = 3 * int64(config.TasksPerEpoch)
+var MaxWinCount = 10 * config.ExpectedLeadersPerEpoch.Int64()
 
 type poiss struct {
 	lam  *big.Int
@@ -175,10 +176,10 @@ func (p *poiss) next() *big.Int {
 // ComputeWinCount uses VRFProof to compute number of wins
 // The algorithm is based on Algorand's Sortition with Binomial distribution
 // replaced by Poisson distribution.
-func (ep *ElectionProof) ComputeWinCount(power BigInt, totalPower BigInt) int64 {
+func (ep *ElectionProof) ComputeWinCount(power *big.Int, totalPower *big.Int) int64 {
 	h := blake2b.Sum256(ep.VRFProof)
 
-	lhs := BigFromBytes(h[:]).Int // 256bits, assume Q.256 so [0, 1)
+	lhs := big.NewInt(0).SetBytes(h[:]) // 256bits, assume Q.256 so [0, 1)
 
 	// We are calculating upside-down CDF of Poisson distribution with
 	// rate λ=power*E/totalPower
@@ -191,7 +192,7 @@ func (ep *ElectionProof) ComputeWinCount(power BigInt, totalPower BigInt) int64
 	//    rhs = 1 - pmf
 	//    for h(vrf) < rhs: j++; pmf = pmf * lam / j; rhs = rhs - pmf
 
-	lam := lambda(power.Int, totalPower.Int) // Q.256
+	lam := lambda(power, totalPower) // Q.256
 
 	p, rhs := newPoiss(lam)
 

types/electionproof_test.go

@@ -1,145 +0,0 @@
-package types
-
-import (
-	"bytes"
-	"fmt"
-	"math/big"
-	"os"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/xorcare/golden"
-)
-
-func TestPoissonFunction(t *testing.T) {
-	tests := []struct {
-		lambdaBase  uint64
-		lambdaShift uint
-	}{
-		{10, 10},      // 0.0097
-		{209714, 20},  // 0.19999885
-		{1036915, 20}, // 0.9888792038
-		{1706, 10},    // 1.6660
-		{2, 0},        // 2
-		{5242879, 20}, //4.9999990
-		{5, 0},        // 5
-	}
-
-	for _, test := range tests {
-		test := test
-		t.Run(fmt.Sprintf("lam-%d-%d", test.lambdaBase, test.lambdaShift), func(t *testing.T) {
-			b := &bytes.Buffer{}
-			b.WriteString("icdf\n")
-
-			lam := new(big.Int).SetUint64(test.lambdaBase)
-			lam = lam.Lsh(lam, precision-test.lambdaShift)
-			p, icdf := newPoiss(lam)
-
-			b.WriteString(icdf.String())
-			b.WriteRune('\n')
-
-			for i := 0; i < 15; i++ {
-				b.WriteString(p.next().String())
-				b.WriteRune('\n')
-			}
-			golden.Assert(t, b.Bytes())
-		})
-	}
-}
-
-func TestLambdaFunction(t *testing.T) {
-	tests := []struct {
-		power      string
-		totalPower string
-		target     float64
-	}{
-		{"10", "100", .1 * 5.},
-		{"1024", "2048", 0.5 * 5.},
-		{"2000000000000000", "100000000000000000", 0.02 * 5.},
-	}
-
-	for _, test := range tests {
-		test := test
-		t.Run(fmt.Sprintf("%s-%s", test.power, test.totalPower), func(t *testing.T) {
-			pow, ok := new(big.Int).SetString(test.power, 10)
-			assert.True(t, ok)
-			total, ok := new(big.Int).SetString(test.totalPower, 10)
-			assert.True(t, ok)
-			lam := lambda(pow, total)
-			assert.Equal(t, test.target, q256ToF(lam))
-			golden.Assert(t, []byte(lam.String()))
-		})
-	}
-}
-
-func TestExpFunction(t *testing.T) {
-	const N = 256
-
-	step := big.NewInt(5)
-	step = step.Lsh(step, 256) // Q.256
-	step = step.Div(step, big.NewInt(N-1))
-
-	x := big.NewInt(0)
-	b := &bytes.Buffer{}
-
-	b.WriteString("x, y\n")
-	for i := 0; i < N; i++ {
-		y := expneg(x)
-		fmt.Fprintf(b, "%s,%s\n", x, y)
-		x = x.Add(x, step)
-	}
-
-	golden.Assert(t, b.Bytes())
-}
-
-func q256ToF(x *big.Int) float64 {
-	deno := big.NewInt(1)
-	deno = deno.Lsh(deno, 256)
-	rat := new(big.Rat).SetFrac(x, deno)
-	f, _ := rat.Float64()
-	return f
-}
-
-func TestElectionLam(t *testing.T) {
-	p := big.NewInt(64)
-	tot := big.NewInt(128)
-	lam := lambda(p, tot)
-	target := 64. * 5. / 128.
-	if q256ToF(lam) != target {
-		t.Fatalf("wrong lambda: %f, should be: %f", q256ToF(lam), target)
-	}
-}
-
-var Res int64
-
-func BenchmarkWinCounts(b *testing.B) {
-	totalPower := NewInt(100)
-	power := NewInt(100)
-	ep := &ElectionProof{VRFProof: nil}
-	var res int64
-
-	b.ResetTimer()
-	b.ReportAllocs()
-	for i := 0; i < b.N; i++ {
-		ep.VRFProof = []byte{byte(i), byte(i >> 8), byte(i >> 16), byte(i >> 24), byte(i >> 32)}
-		j := ep.ComputeWinCount(power, totalPower)
-		res += j
-	}
-	Res += res
-}
-
-func TestWinCounts(t *testing.T) {
-	t.SkipNow()
-	totalPower := NewInt(100)
-	power := NewInt(30)
-
-	f, _ := os.Create("output.wins")
-	fmt.Fprintf(f, "wins\n")
-	ep := &ElectionProof{VRFProof: nil}
-	for i := uint64(0); i < 1000000; i++ {
-		i := i + 1000000
-		ep.VRFProof = []byte{byte(i), byte(i >> 8), byte(i >> 16), byte(i >> 24), byte(i >> 32)}
-		j := ep.ComputeWinCount(power, totalPower)
-		fmt.Fprintf(f, "%d\n", j)
-	}
-}

types/task.go

@@ -1,63 +1,12 @@
 package types
 
-import (
-	"strconv"
-
-	"github.com/libp2p/go-libp2p-core/peer"
-
-	"github.com/Secured-Finance/dione/config"
-)
-
-// DrandRound represents the round number in DRAND
-type DrandRound int64
-
-const TicketRandomnessLookback = DrandRound(1)
-
-func (e DrandRound) String() string {
-	return strconv.FormatInt(int64(e), 10)
-}
+const TicketRandomnessLookback = 1
 
 // DioneTask represents the values of task computation
 type DioneTask struct {
 	OriginChain   uint8
 	RequestType   string
 	RequestParams string
-	Miner         peer.ID
-	MinerEth      string
-	Ticket        *Ticket
-	ElectionProof *ElectionProof
-	BeaconEntries []BeaconEntry
-	DrandRound    DrandRound
 	Payload       []byte
 	RequestID     string
-	ConsensusID   string
-	Signature     []byte `hash:"-"`
 }
-
-func NewDioneTask(
-	originChain uint8,
-	requestType string,
-	requestParams string,
-	miner peer.ID,
-	ticket *Ticket,
-	electionProof *ElectionProof,
-	beacon []BeaconEntry,
-	drand DrandRound,
-	payload []byte,
-) *DioneTask {
-	return &DioneTask{
-		OriginChain:   originChain,
-		RequestType:   requestType,
-		RequestParams: requestParams,
-		Miner:         miner,
-		Ticket:        ticket,
-		ElectionProof: electionProof,
-		BeaconEntries: beacon,
-		DrandRound:    drand,
-		Payload:       payload,
-	}
-}
-
-var tasksPerEpoch = NewInt(config.TasksPerEpoch)
-
-const sha256bits = 256

types/ticket.go

@@ -1,21 +0,0 @@
-package types
-
-import (
-	"math/big"
-
-	"github.com/minio/blake2b-simd"
-)
-
-type Ticket struct {
-	VRFProof []byte
-}
-
-func (t *Ticket) Quality() float64 {
-	ticketHash := blake2b.Sum256(t.VRFProof)
-	ticketNum := BigFromBytes(ticketHash[:]).Int
-	ticketDenu := big.NewInt(1)
-	ticketDenu.Lsh(ticketDenu, 256)
-	tv, _ := new(big.Rat).SetFrac(ticketNum, ticketDenu).Float64()
-	tq := 1 - tv
-	return tq
-}

wallet/wallet.go

@@ -50,7 +50,7 @@ func KeyWallet(keys ...*Key) *LocalWallet {
 	}
 }
 
-func (w *LocalWallet) WalletSign(ctx context.Context, addr peer.ID, msg []byte) (*types.Signature, error) {
+func (w *LocalWallet) Sign(addr peer.ID, msg []byte) (*types.Signature, error) {
 	ki, err := w.findKey(addr)
 	if err != nil {
 		return nil, err
@@ -143,7 +143,7 @@ func (w *LocalWallet) GetDefault() (peer.ID, error) {
 	return k.Address, nil
 }
 
-func (w *LocalWallet) WalletNew(ctx context.Context, typ types.KeyType) (peer.ID, error) {
+func (w *LocalWallet) NewKey(typ types.KeyType) (peer.ID, error) {
 	w.lk.Lock()
 	defer w.lk.Unlock()