package consensus import ( "math/big" "sync" "github.com/Secured-Finance/dione/cache" "github.com/Secured-Finance/dione/consensus/types" "github.com/Secured-Finance/dione/ethclient" "github.com/sirupsen/logrus" "github.com/Secured-Finance/dione/pubsub" types2 "github.com/Secured-Finance/dione/types" ) type PBFTConsensusManager struct { psb *pubsub.PubSubRouter minApprovals int privKey []byte msgLog *MessageLog validator *ConsensusValidator consensusMap map[string]*Consensus ethereumClient *ethclient.EthereumClient miner *Miner cache cache.Cache } type Consensus struct { mutex sync.Mutex Finished bool IsCurrentMinerLeader bool Task *types2.DioneTask } func NewPBFTConsensusManager(psb *pubsub.PubSubRouter, minApprovals int, privKey []byte, ethereumClient *ethclient.EthereumClient, miner *Miner, evc cache.Cache) *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.cache = 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) if err != nil { return err } pcm.psb.BroadcastToServiceTopic(prePrepareMsg) 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) if err != nil { logrus.Errorf("failed to create prepare message: %v", err) } pcm.createConsensusInfo(&message.Payload.Task, false) pcm.psb.BroadcastToServiceTopic(&prepareMsg) } 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...") return } pcm.msgLog.AddMessage(*message) if len(pcm.msgLog.GetMessagesByTypeAndConsensusID(types.MessageTypePrepare, message.Payload.Task.ConsensusID)) >= pcm.minApprovals { commitMsg, err := NewMessage(message, types.MessageTypeCommit) if err != nil { logrus.Errorf("failed to create commit message: %w", err) } 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 !pcm.validator.Valid(*message) { logrus.Warn("received invalid commit msg, dropping...") 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...") 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) GetConsensusInfo(consensusID string) *Consensus { c, ok := pcm.consensusMap[consensusID] if !ok { return nil } return c }