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" oracleEmitter "github.com/Secured-Finance/dione/contracts/oracleemitter" "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 *oracleEmitter.OracleEmitterNewOracleRequest) (*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) } bres := []byte(res) return &types.DioneTask{ OriginChain: event.OriginChain, RequestType: event.RequestType, RequestParams: event.RequestParams, Miner: m.address, MinerEth: m.ethAddress.Hex(), Ticket: ticket, ElectionProof: winner, BeaconEntries: beaconValues, Payload: bres, 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 }