dione/consensus/consensus_round_pool.go

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package consensus
import (
"bytes"
"encoding/hex"
"fmt"
"time"
"github.com/Secured-Finance/dione/blockchain/pool"
"github.com/asaskevich/EventBus"
"github.com/sirupsen/logrus"
"github.com/Secured-Finance/dione/blockchain/types"
"github.com/Secured-Finance/dione/cache"
)
type State uint8
const (
StateStatusUnknown = iota
StateStatusPrePrepared
StateStatusPrepared
StateStatusCommited
)
// ConsensusRoundPool is pool for blocks that isn't not validated or committed yet
type ConsensusRoundPool struct {
mempool *pool.Mempool
consensusInfoStorage cache.Cache
bus EventBus.Bus
}
func NewConsensusRoundPool(mp *pool.Mempool, bus EventBus.Bus) (*ConsensusRoundPool, error) {
bp := &ConsensusRoundPool{
consensusInfoStorage: cache.NewInMemoryCache(),
mempool: mp,
bus: bus,
}
return bp, nil
}
type ConsensusInfo struct {
Block *types.Block
State State
}
func (crp *ConsensusRoundPool) AddConsensusInfo(block *types.Block) error {
encodedHash := hex.EncodeToString(block.Header.Hash)
if crp.consensusInfoStorage.Exists(encodedHash) {
return nil
}
err := crp.consensusInfoStorage.StoreWithTTL(encodedHash, &ConsensusInfo{
Block: block,
State: StateStatusPrePrepared,
}, 10*time.Minute)
if err != nil {
return err
}
logrus.WithField("hash", fmt.Sprintf("%x", block.Header.Hash)).Debug("New block discovered")
crp.bus.Publish("blockpool:knownBlockAdded", block)
return nil
}
func (crp *ConsensusRoundPool) UpdateConsensusState(blockhash []byte, newState State) error {
encodedHash := hex.EncodeToString(blockhash)
var consensusInfo ConsensusInfo
err := crp.consensusInfoStorage.Get(encodedHash, &consensusInfo)
if err != nil {
return err
}
if newState < consensusInfo.State {
return fmt.Errorf("attempt to set incorrect state")
}
consensusInfo.State = newState
crp.bus.Publish("blockpool:newConsensusState", blockhash, newState)
return crp.consensusInfoStorage.StoreWithTTL(encodedHash, &consensusInfo, 10*time.Minute)
}
func (crp *ConsensusRoundPool) GetConsensusInfo(blockhash []byte) (*ConsensusInfo, error) {
var consensusInfo ConsensusInfo
err := crp.consensusInfoStorage.Get(hex.EncodeToString(blockhash), &consensusInfo)
return &consensusInfo, err
}
// Prune cleans known blocks list. It is called when new consensus round starts.
func (crp *ConsensusRoundPool) Prune() {
for k := range crp.consensusInfoStorage.Items() {
crp.consensusInfoStorage.Delete(k)
}
crp.bus.Publish("blockpool:pruned")
}
func (crp *ConsensusRoundPool) GetAllBlocksWithCommit() []*ConsensusInfo {
var consensusInfos []*ConsensusInfo
for _, v := range crp.consensusInfoStorage.Items() {
ci := v.(*ConsensusInfo)
if ci.State == StateStatusCommited {
consensusInfos = append(consensusInfos, ci)
}
}
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
}