Tendermint阅读XI

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func NewNode(config *cfg.Config,
	privValidator types.PrivValidator,
	nodeKey *p2p.NodeKey,
	clientCreator proxy.ClientCreator,
	genesisDocProvider GenesisDocProvider,
	dbProvider DBProvider,
	metricsProvider MetricsProvider,
	logger log.Logger) (*Node, error) {

	// 获取我们一个区块存储的对象，我们在blockchain模块提到了这个功能
	blockStoreDB, err := dbProvider(&DBContext{"blockstore", config})
	if err != nil {
		return nil, err
	}
	blockStore := bc.NewBlockStore(blockStoreDB)

	// 系统状态的数据库
	stateDB, err := dbProvider(&DBContext{"state", config})
	if err != nil {
		return nil, err
	}

	// 默认的创始区块信息
	genDoc, err := loadGenesisDoc(stateDB)
	if err != nil {
		genDoc, err = genesisDocProvider()
		if err != nil {
			return nil, err
		}
		// save genesis doc to prevent a certain class of user errors (e.g. when it
		// was changed, accidentally or not). Also good for audit trail.
		saveGenesisDoc(stateDB, genDoc)
	}

    // 读取系统状态，这个我们在state模块提到了本功能
	state, err := sm.LoadStateFromDBOrGenesisDoc(stateDB, genDoc)
	if err != nil {
		return nil, err
	}

	// 和abci通信的程序
	proxyApp := proxy.NewAppConns(clientCreator)
	proxyApp.SetLogger(logger.With("module", "proxy"))
	if err := proxyApp.Start(); err != nil {
		return nil, fmt.Errorf("Error starting proxy app connections: %v", err)
	}

	// 会在proxyApp.start中调用handshake，进行区块重放进行APPHASH的校验
	consensusLogger := logger.With("module", "consensus")
	handshaker := cs.NewHandshaker(stateDB, state, blockStore, genDoc)
	handshaker.SetLogger(consensusLogger)
	if err := handshaker.Handshake(proxyApp); err != nil {
		return nil, fmt.Errorf("Error during handshake: %v", err)
	}

	// 重新加载一下区块的状态
	state = sm.LoadState(stateDB)

	// Log the version info.
	logger.Info("Version info",
		"software", version.TMCoreSemVer,
		"block", version.BlockProtocol,
		"p2p", version.P2PProtocol,
	)

	// If the state and software differ in block version, at least log it.
	if state.Version.Consensus.Block != version.BlockProtocol {
		logger.Info("Software and state have different block protocols",
			"software", version.BlockProtocol,
			"state", state.Version.Consensus.Block,
		)
	}

	// 创建一个验证角色，并且和其他的validator能够通信
	if config.PrivValidatorListenAddr != "" {
		// If an address is provided, listen on the socket for a connection from an
		// external signing process.
		// FIXME: we should start services inside OnStart
		privValidator, err = createAndStartPrivValidatorSocketClient(config.PrivValidatorListenAddr, logger)
		if err != nil {
			return nil, errors.Wrap(err, "Error with private validator socket client")
		}
	}

	// Decide whether to fast-sync or not
	// We don't fast-sync when the only validator is us.
	fastSync := config.FastSync
	if state.Validators.Size() == 1 {
		addr, _ := state.Validators.GetByIndex(0)
		if bytes.Equal(privValidator.GetAddress(), addr) {
			fastSync = false
		}
	}

	// Log whether this node is a validator or an observer
	if state.Validators.HasAddress(privValidator.GetAddress()) {
		consensusLogger.Info("This node is a validator", "addr", privValidator.GetAddress(), "pubKey", privValidator.GetPubKey())
	} else {
		consensusLogger.Info("This node is not a validator", "addr", privValidator.GetAddress(), "pubKey", privValidator.GetPubKey())
	}

	csMetrics, p2pMetrics, memplMetrics, smMetrics := metricsProvider()

	// 创建内存池
	mempool := mempl.NewMempool(
		config.Mempool,
		proxyApp.Mempool(),
		state.LastBlockHeight,
		mempl.WithMetrics(memplMetrics),
		mempl.WithPreCheck(sm.TxPreCheck(state)),
		mempl.WithPostCheck(sm.TxPostCheck(state)),
	)
	mempoolLogger := logger.With("module", "mempool")
	mempool.SetLogger(mempoolLogger)
	if config.Mempool.WalEnabled() {
		mempool.InitWAL() // no need to have the mempool wal during tests
	}
	mempoolReactor := mempl.NewMempoolReactor(config.Mempool, mempool)
	mempoolReactor.SetLogger(mempoolLogger)

	if config.Consensus.WaitForTxs() {
		mempool.EnableTxsAvailable()
	}

	// 创建证据Reactor
	evidenceDB, err := dbProvider(&DBContext{"evidence", config})
	if err != nil {
		return nil, err
	}
	evidenceLogger := logger.With("module", "evidence")
	evidenceStore := evidence.NewEvidenceStore(evidenceDB)
	evidencePool := evidence.NewEvidencePool(stateDB, evidenceStore)
	evidencePool.SetLogger(evidenceLogger)
	evidenceReactor := evidence.NewEvidenceReactor(evidencePool)
	evidenceReactor.SetLogger(evidenceLogger)

	blockExecLogger := logger.With("module", "state")
	// make block executor for consensus and blockchain reactors to execute blocks
	blockExec := sm.NewBlockExecutor(
		stateDB,
		blockExecLogger,
		proxyApp.Consensus(),
		mempool,
		evidencePool,
		sm.BlockExecutorWithMetrics(smMetrics),
	)

	// 方便后面我们的ApplyBlock
	bcReactor := bc.NewBlockchainReactor(state.Copy(), blockExec, blockStore, fastSync)
	bcReactor.SetLogger(logger.With("module", "blockchain"))

	// 创建共识的reactor
	consensusState := cs.NewConsensusState(
		config.Consensus,
		state.Copy(),
		blockExec,
		blockStore,
		mempool,
		evidencePool,
		cs.StateMetrics(csMetrics),
	)
	consensusState.SetLogger(consensusLogger)
	if privValidator != nil {
		consensusState.SetPrivValidator(privValidator)
	}
	consensusReactor := cs.NewConsensusReactor(consensusState, fastSync, cs.ReactorMetrics(csMetrics))
	consensusReactor.SetLogger(consensusLogger)

	eventBus := types.NewEventBus()
	eventBus.SetLogger(logger.With("module", "events"))

	// services which will be publishing and/or subscribing for messages (events)
	// consensusReactor will set it on consensusState and blockExecutor
	consensusReactor.SetEventBus(eventBus)

	// 交易索引的服务
	var txIndexer txindex.TxIndexer
	switch config.TxIndex.Indexer {
	case "kv":
		store, err := dbProvider(&DBContext{"tx_index", config})
		if err != nil {
			return nil, err
		}
		if config.TxIndex.IndexTags != "" {
			txIndexer = kv.NewTxIndex(store, kv.IndexTags(splitAndTrimEmpty(config.TxIndex.IndexTags, ",", " ")))
		} else if config.TxIndex.IndexAllTags {
			txIndexer = kv.NewTxIndex(store, kv.IndexAllTags())
		} else {
			txIndexer = kv.NewTxIndex(store)
		}
	default:
		txIndexer = &null.TxIndex{}
	}

	indexerService := txindex.NewIndexerService(txIndexer, eventBus)
	indexerService.SetLogger(logger.With("module", "txindex"))

	p2pLogger := logger.With("module", "p2p")
	nodeInfo, err := makeNodeInfo(
		config,
		nodeKey.ID(),
		txIndexer,
		genDoc.ChainID,
		p2p.NewProtocolVersion(
			version.P2PProtocol, // global
			state.Version.Consensus.Block,
			state.Version.Consensus.App,
		),
	)
	if err != nil {
		return nil, err
	}

	// Setup Transport.
	var (
		mConnConfig = p2p.MConnConfig(config.P2P)
		transport   = p2p.NewMultiplexTransport(nodeInfo, *nodeKey, mConnConfig)
		connFilters = []p2p.ConnFilterFunc{}
		peerFilters = []p2p.PeerFilterFunc{}
	)

	if !config.P2P.AllowDuplicateIP {
		connFilters = append(connFilters, p2p.ConnDuplicateIPFilter())
	}

	// Filter peers by addr or pubkey with an ABCI query.
	// If the query return code is OK, add peer.
	if config.FilterPeers {
		connFilters = append(
			connFilters,
			// ABCI query for address filtering.
			func(_ p2p.ConnSet, c net.Conn, _ []net.IP) error {
				res, err := proxyApp.Query().QuerySync(abci.RequestQuery{
					Path: fmt.Sprintf("/p2p/filter/addr/%s", c.RemoteAddr().String()),
				})
				if err != nil {
					return err
				}
				if res.IsErr() {
					return fmt.Errorf("Error querying abci app: %v", res)
				}

				return nil
			},
		)

		peerFilters = append(
			peerFilters,
			// ABCI query for ID filtering.
			func(_ p2p.IPeerSet, p p2p.Peer) error {
				res, err := proxyApp.Query().QuerySync(abci.RequestQuery{
					Path: fmt.Sprintf("/p2p/filter/id/%s", p.ID()),
				})
				if err != nil {
					return err
				}
				if res.IsErr() {
					return fmt.Errorf("Error querying abci app: %v", res)
				}

				return nil
			},
		)
	}

	p2p.MultiplexTransportConnFilters(connFilters...)(transport)

	// Setup Switch.
	sw := p2p.NewSwitch(
		config.P2P,
		transport,
		p2p.WithMetrics(p2pMetrics),
		p2p.SwitchPeerFilters(peerFilters...),
	)
	sw.SetLogger(p2pLogger)
	// 把各种组件都添加进去，之前的模块都在这集合起来了
	sw.AddReactor("MEMPOOL", mempoolReactor)
	sw.AddReactor("BLOCKCHAIN", bcReactor)
	sw.AddReactor("CONSENSUS", consensusReactor)
	sw.AddReactor("EVIDENCE", evidenceReactor)
	sw.SetNodeInfo(nodeInfo)
	sw.SetNodeKey(nodeKey)

	p2pLogger.Info("P2P Node ID", "ID", nodeKey.ID(), "file", config.NodeKeyFile())

	// 地址信息，方便节点连接其他节点，发现其他节点
	addrBook := pex.NewAddrBook(config.P2P.AddrBookFile(), config.P2P.AddrBookStrict)

	// Add ourselves to addrbook to prevent dialing ourselves
	addrBook.AddOurAddress(nodeInfo.NetAddress())

	addrBook.SetLogger(p2pLogger.With("book", config.P2P.AddrBookFile()))
	if config.P2P.PexReactor {
		// TODO persistent peers ? so we can have their DNS addrs saved
		pexReactor := pex.NewPEXReactor(addrBook,
			&pex.PEXReactorConfig{
				Seeds:    splitAndTrimEmpty(config.P2P.Seeds, ",", " "),
				SeedMode: config.P2P.SeedMode,
			})
		pexReactor.SetLogger(logger.With("module", "pex"))
		sw.AddReactor("PEX", pexReactor)
	}

	sw.SetAddrBook(addrBook)

	// run the profile server
	profileHost := config.ProfListenAddress
	if profileHost != "" {
		go func() {
			logger.Error("Profile server", "err", http.ListenAndServe(profileHost, nil))
		}()
	}

	node := &Node{
		config:        config,
		genesisDoc:    genDoc,
		privValidator: privValidator,

		transport: transport,
		sw:        sw,
		addrBook:  addrBook,
		nodeInfo:  nodeInfo,
		nodeKey:   nodeKey,

		stateDB:          stateDB,
		blockStore:       blockStore,
		bcReactor:        bcReactor,
		mempoolReactor:   mempoolReactor,
		consensusState:   consensusState,
		consensusReactor: consensusReactor,
		evidencePool:     evidencePool,
		proxyApp:         proxyApp,
		txIndexer:        txIndexer,
		indexerService:   indexerService,
		eventBus:         eventBus,
	}
	node.BaseService = *cmn.NewBaseService(logger, "Node", node)
	return node, nil
}

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func (n *Node) OnStart() error {
	now := tmtime.Now()
	genTime := n.genesisDoc.GenesisTime
	if genTime.After(now) {
		n.Logger.Info("Genesis time is in the future. Sleeping until then...", "genTime", genTime)
		time.Sleep(genTime.Sub(now))
	}

	err := n.eventBus.Start()
	if err != nil {
		return err
	}

	// Add private IDs to addrbook to block those peers being added
	n.addrBook.AddPrivateIDs(splitAndTrimEmpty(n.config.P2P.PrivatePeerIDs, ",", " "))

	// Start the RPC server before the P2P server
	// so we can eg. receive txs for the first block
	if n.config.RPC.ListenAddress != "" {
		listeners, err := n.startRPC()
		if err != nil {
			return err
		}
		n.rpcListeners = listeners
	}

	if n.config.Instrumentation.Prometheus &&
		n.config.Instrumentation.PrometheusListenAddr != "" {
		n.prometheusSrv = n.startPrometheusServer(n.config.Instrumentation.PrometheusListenAddr)
	}

	// Start the transport.
	addr, err := p2p.NewNetAddressStringWithOptionalID(n.config.P2P.ListenAddress)
	if err != nil {
		return err
	}
	if err := n.transport.Listen(*addr); err != nil {
		return err
	}

	n.isListening = true

	// Start the switch (the P2P server).
	err = n.sw.Start()
	if err != nil {
		return err
	}

	// Always connect to persistent peers
	if n.config.P2P.PersistentPeers != "" {
		err = n.sw.DialPeersAsync(n.addrBook, splitAndTrimEmpty(n.config.P2P.PersistentPeers, ",", " "), true)
		if err != nil {
			return err
		}
	}

	// start tx indexer
	return n.indexerService.Start()
}