package master import ( "encoding/hex" "sync" "time" "github.com/pkg/errors" "go.uber.org/zap" "source.quilibrium.com/quilibrium/monorepo/node/config" "source.quilibrium.com/quilibrium/monorepo/node/consensus" "source.quilibrium.com/quilibrium/monorepo/node/execution" "source.quilibrium.com/quilibrium/monorepo/node/keys" "source.quilibrium.com/quilibrium/monorepo/node/p2p" "source.quilibrium.com/quilibrium/monorepo/node/protobufs" "source.quilibrium.com/quilibrium/monorepo/node/store" ) type SyncStatusType int const ( SyncStatusNotSyncing = iota SyncStatusAwaitingResponse SyncStatusSynchronizing ) type MasterClockConsensusEngine struct { frame uint64 difficulty uint32 logger *zap.Logger state consensus.EngineState pubSub p2p.PubSub keyManager keys.KeyManager lastFrameReceivedAt time.Time latestFrame *protobufs.ClockFrame frameChan chan uint64 executionEngines map[string]execution.ExecutionEngine filter []byte input []byte syncingStatus SyncStatusType syncingTarget []byte engineMx sync.Mutex seenFramesMx sync.Mutex historicFramesMx sync.Mutex seenFrames []*protobufs.ClockFrame historicFrames []*protobufs.ClockFrame clockStore store.ClockStore } var _ consensus.ConsensusEngine = (*MasterClockConsensusEngine)(nil) func NewMasterClockConsensusEngine( engineConfig *config.EngineConfig, logger *zap.Logger, clockStore store.ClockStore, keyManager keys.KeyManager, pubSub p2p.PubSub, ) *MasterClockConsensusEngine { if logger == nil { panic(errors.New("logger is nil")) } if engineConfig == nil { panic(errors.New("engine config is nil")) } if keyManager == nil { panic(errors.New("key manager is nil")) } if pubSub == nil { panic(errors.New("pubsub is nil")) } seed, err := hex.DecodeString(engineConfig.GenesisSeed) if err != nil { panic(errors.New("genesis seed is nil")) } e := &MasterClockConsensusEngine{ frame: 0, difficulty: 10000, logger: logger, state: consensus.EngineStateStopped, keyManager: keyManager, pubSub: pubSub, frameChan: make(chan uint64), executionEngines: map[string]execution.ExecutionEngine{}, input: seed, lastFrameReceivedAt: time.Time{}, syncingStatus: SyncStatusNotSyncing, clockStore: clockStore, } if e.filter, err = hex.DecodeString(engineConfig.Filter); err != nil { panic(errors.Wrap(err, "could not parse filter value")) } logger.Info("constructing consensus engine") return e } func (e *MasterClockConsensusEngine) Start() <-chan error { e.logger.Info("starting consensus engine") e.state = consensus.EngineStateStarting errChan := make(chan error) e.state = consensus.EngineStateLoading e.logger.Info("syncing last seen state") latestFrame, err := e.clockStore.GetLatestMasterClockFrame(e.filter) if err != nil && errors.Is(err, store.ErrNotFound) { latestFrame = e.createGenesisFrame() txn, err := e.clockStore.NewTransaction() if err != nil { panic(err) } if err = e.clockStore.PutMasterClockFrame(latestFrame, txn); err != nil { panic(err) } if err = txn.Commit(); err != nil { panic(err) } } else if err != nil { panic(err) } else { e.setFrame(latestFrame) } e.historicFrames = []*protobufs.ClockFrame{} if latestFrame.FrameNumber != 0 { min := uint64(0) if latestFrame.FrameNumber-255 > min { min = latestFrame.FrameNumber - 255 } iter, err := e.clockStore.RangeMasterClockFrames( e.filter, min, latestFrame.FrameNumber-1, ) if err != nil { panic(err) } for iter.First(); iter.Valid(); iter.Next() { frame, err := iter.Value() if err != nil { panic(err) } e.historicFrames = append(e.historicFrames, frame) } if err = iter.Close(); err != nil { panic(err) } } e.historicFrames = append(e.historicFrames, latestFrame) e.logger.Info("subscribing to pubsub messages") e.pubSub.Subscribe(e.filter, e.handleMessage, true) e.pubSub.Subscribe(e.pubSub.GetPeerID(), e.handleSync, true) e.state = consensus.EngineStateCollecting go func() { for { e.logger.Info( "peers in store", zap.Int("peer_store_count", e.pubSub.GetPeerstoreCount()), zap.Int("network_peer_count", e.pubSub.GetNetworkPeersCount()), ) time.Sleep(10 * time.Second) } }() go func() { for e.state < consensus.EngineStateStopping { var err error switch e.state { case consensus.EngineStateCollecting: if latestFrame, err = e.collect(latestFrame); err != nil { e.logger.Error("could not collect", zap.Error(err)) errChan <- err } case consensus.EngineStateProving: if latestFrame, err = e.prove(latestFrame); err != nil { e.logger.Error("could not prove", zap.Error(err)) errChan <- err } case consensus.EngineStatePublishing: if err = e.publishProof(latestFrame); err != nil { e.logger.Error("could not publish", zap.Error(err)) errChan <- err } } } }() go func() { errChan <- nil }() return errChan } func (e *MasterClockConsensusEngine) Stop(force bool) <-chan error { e.logger.Info("stopping consensus engine") e.state = consensus.EngineStateStopping errChan := make(chan error) wg := sync.WaitGroup{} wg.Add(len(e.executionEngines)) for name := range e.executionEngines { name := name go func(name string) { err := <-e.UnregisterExecutor(name, e.frame, force) if err != nil { errChan <- err } wg.Done() }(name) } e.logger.Info("waiting for execution engines to stop") wg.Wait() e.logger.Info("execution engines stopped") e.state = consensus.EngineStateStopped e.engineMx.Lock() defer e.engineMx.Unlock() go func() { errChan <- nil }() return errChan } func (e *MasterClockConsensusEngine) GetDifficulty() uint32 { return e.difficulty } func (e *MasterClockConsensusEngine) GetFrame() uint64 { return e.frame } func (e *MasterClockConsensusEngine) GetState() consensus.EngineState { return e.state } func (e *MasterClockConsensusEngine) GetFrameChannel() <-chan uint64 { return e.frameChan }