区块链教程Fabric1.0源代码分析流言算法Gossip服务端二

Fabric 1.0源代码笔记 之 gossip（流言算法） #GossipServer（Gossip服务端）

5.2、commImpl结构体方法

//conn.serviceConnection()，启动连接服务
func (c *commImpl) GossipStream(stream proto.Gossip_GossipStreamServer) error
//return &proto.Empty{}
func (c *commImpl) Ping(context.Context, *proto.Empty) (*proto.Empty, error)func (c *commImpl) GetPKIid() common.PKIidType
//向指定节点发送消息
func (c *commImpl) Send(msg *proto.SignedGossipMessage, peers ...*RemotePeer)
//探测远程节点是否有响应，_, err = cl.Ping(context.Background(), &proto.Empty{})
func (c *commImpl) Probe(remotePeer *RemotePeer) error
//握手验证远程节点，_, err = cl.Ping(context.Background(), &proto.Empty{})
func (c *commImpl) Handshake(remotePeer *RemotePeer) (api.PeerIdentityType, error)
func (c *commImpl) Accept(acceptor common.MessageAcceptor) <-chan proto.ReceivedMessage
func (c *commImpl) PresumedDead() <-chan common.PKIidType
func (c *commImpl) CloseConn(peer *RemotePeer)
func (c *commImpl) Stop()//创建并启动gRPC Server，以及注册GossipServer实例
func NewCommInstanceWithServer(port int, idMapper identity.Mapper, peerIdentity api.PeerIdentityType,
//将GossipServer实例注册至peerServer
func NewCommInstance(s *grpc.Server, cert *tls.Certificate, idStore identity.Mapper,
func extractRemoteAddress(stream stream) string
func readWithTimeout(stream interface{}, timeout time.Duration, address string) (*proto.SignedGossipMessage, error)
//创建gRPC Server，grpc.NewServer(serverOpts...)
func createGRPCLayer(port int) (*grpc.Server, net.Listener, api.PeerSecureDialOpts, []byte)//创建与服务端连接
func (c *commImpl) createConnection(endpoint string, expectedPKIID common.PKIidType) (*connection, error)
//向指定节点发送消息
func (c *commImpl) sendToEndpoint(peer *RemotePeer, msg *proto.SignedGossipMessage)
//return atomic.LoadInt32(&c.stopping) == int32(1)
func (c *commImpl) isStopping() bool
func (c *commImpl) emptySubscriptions()
func (c *commImpl) authenticateRemotePeer(stream stream) (*proto.ConnectionInfo, error)
func (c *commImpl) disconnect(pkiID common.PKIidType)
func (c *commImpl) createConnectionMsg(pkiID common.PKIidType, certHash []byte, cert api.PeerIdentityType, signer proto.Signer) (*proto.SignedGossipMessage, error)
//代码在gossip/comm/comm_impl.go

5.2.1、func NewCommInstanceWithServer(port int, idMapper identity.Mapper, peerIdentity api.PeerIdentityType,secureDialOpts api.PeerSecureDialOpts, dialOpts ...grpc.DialOption) (Comm, error)

创建并启动gRPC Server，以及注册GossipServer实例

func NewCommInstanceWithServer(port int, idMapper identity.Mapper, peerIdentity api.PeerIdentityType,secureDialOpts api.PeerSecureDialOpts, dialOpts ...grpc.DialOption) (Comm, error) {var ll net.Listenervar s *grpc.Servervar certHash []byteif len(dialOpts) == 0 {//peer.gossip.dialTimeout，gRPC连接拨号的超时dialOpts = []grpc.DialOption{grpc.WithTimeout(util.GetDurationOrDefault("peer.gossip.dialTimeout", defDialTimeout))}}if port > 0 {//创建gRPC Server，grpc.NewServer(serverOpts...)s, ll, secureDialOpts, certHash = createGRPCLayer(port)}commInst := &commImpl{selfCertHash:   certHash,PKIID:          idMapper.GetPKIidOfCert(peerIdentity),idMapper:       idMapper,logger:         util.GetLogger(util.LoggingCommModule, fmt.Sprintf("%d", port)),peerIdentity:   peerIdentity,opts:           dialOpts,secureDialOpts: secureDialOpts,port:           port,lsnr:           ll,gSrv:           s,msgPublisher:   NewChannelDemultiplexer(),lock:           &sync.RWMutex{},deadEndpoints:  make(chan common.PKIidType, 100),stopping:       int32(0),exitChan:       make(chan struct{}, 1),subscriptions:  make([]chan proto.ReceivedMessage, 0),}commInst.connStore = newConnStore(commInst, commInst.logger)if port > 0 {commInst.stopWG.Add(1)go func() {defer commInst.stopWG.Done()s.Serve(ll) //启动gRPC Server}()//commInst注册到gRPC Serverproto.RegisterGossipServer(s, commInst)}return commInst, nil
}//代码在gossip/comm/comm_impl.go

5.2.2、func NewCommInstance(s grpc.Server, cert tls.Certificate, idStore identity.Mapper,peerIdentity api.PeerIdentityType, secureDialOpts api.PeerSecureDialOpts,dialOpts ...grpc.DialOption) (Comm, error)

将GossipServer实例注册至peerServer

func NewCommInstance(s *grpc.Server, cert *tls.Certificate, idStore identity.Mapper,peerIdentity api.PeerIdentityType, secureDialOpts api.PeerSecureDialOpts,dialOpts ...grpc.DialOption) (Comm, error) {dialOpts = append(dialOpts, grpc.WithTimeout(util.GetDurationOrDefault("peer.gossip.dialTimeout", defDialTimeout)))//构造commImplcommInst, err := NewCommInstanceWithServer(-1, idStore, peerIdentity, secureDialOpts, dialOpts...)if cert != nil {inst := commInst.(*commImpl)inst.selfCertHash = certHashFromRawCert(cert.Certificate[0])}proto.RegisterGossipServer(s, commInst.(*commImpl))return commInst, nil
}//代码在gossip/comm/comm_impl.go

//创建与服务端连接

5.2.3、func (c commImpl) createConnection(endpoint string, expectedPKIID common.PKIidType) (connection, error)

func (c *commImpl) createConnection(endpoint string, expectedPKIID common.PKIidType) (*connection, error) {var err errorvar cc *grpc.ClientConnvar stream proto.Gossip_GossipStreamClientvar pkiID common.PKIidTypevar connInfo *proto.ConnectionInfovar dialOpts []grpc.DialOptiondialOpts = append(dialOpts, c.secureDialOpts()...)dialOpts = append(dialOpts, grpc.WithBlock())dialOpts = append(dialOpts, c.opts...)cc, err = grpc.Dial(endpoint, dialOpts...)cl := proto.NewGossipClient(cc)if _, err = cl.Ping(context.Background(), &proto.Empty{}); err != nil {cc.Close()return nil, err}ctx, cf := context.WithCancel(context.Background())stream, err = cl.GossipStream(ctx)connInfo, err = c.authenticateRemotePeer(stream)pkiID = connInfo.IDconn := newConnection(cl, cc, stream, nil)conn.pkiID = pkiIDconn.info = connInfoconn.logger = c.loggerconn.cancel = cfh := func(m *proto.SignedGossipMessage) {c.msgPublisher.DeMultiplex(&ReceivedMessageImpl{conn:                conn,lock:                conn,SignedGossipMessage: m,connInfo:            connInfo,})}conn.handler = hreturn conn, nil
}
//代码在gossip/comm/comm_impl.go

6、connectionStore和connection结构体及方法

6.1、connection结构体及方法

type connection struct {cancel       context.CancelFuncinfo         *proto.ConnectionInfooutBuff      chan *msgSendinglogger       *logging.Logger                 // loggerpkiID        common.PKIidType                // pkiID of the remote endpointhandler      handler                         // function to invoke upon a message receptionconn         *grpc.ClientConn                // gRPC connection to remote endpointcl           proto.GossipClient              // gRPC stub of remote endpointclientStream proto.Gossip_GossipStreamClient // client-side stream to remote endpointserverStream proto.Gossip_GossipStreamServer // server-side stream to remote endpointstopFlag     int32                           // indicates whether this connection is in process of stoppingstopChan     chan struct{}                   // a method to stop the server-side gRPC call from a different go-routinesync.RWMutex                                 // synchronizes access to shared variables
}//构造connection
func newConnection(cl proto.GossipClient, c *grpc.ClientConn, cs proto.Gossip_GossipStreamClient, ss proto.Gossip_GossipStreamServer) *connection
//关闭connection
func (conn *connection) close()
//atomic.LoadInt32(&(conn.stopFlag)) == int32(1)
func (conn *connection) toDie() bool
//conn.outBuff <- m，其中m为msgSending{envelope: msg.Envelope,onErr: onErr,}
func (conn *connection) send(msg *proto.SignedGossipMessage, onErr func(error))
//go conn.readFromStream(errChan, msgChan)、go conn.writeToStream()，同时msg := <-msgChan，conn.handler(msg)
func (conn *connection) serviceConnection() error
//循环不间断从conn.outBuff取数据，然后stream.Send(m.envelope)
func (conn *connection) writeToStream()
//循环不间断envelope, err := stream.Recv()、msg, err := envelope.ToGossipMessage()、msgChan <- msg
func (conn *connection) readFromStream(errChan chan error, msgChan chan *proto.SignedGossipMessage)
//获取conn.serverStream
func (conn *connection) getStream() stream
//代码在gossip/comm/conn.go

6.2、connectionStore结构体及方法

type connectionStore struct {logger           *logging.Logger          // loggerisClosing        bool                     // whether this connection store is shutting downconnFactory      connFactory              // creates a connection to remote peersync.RWMutex                              // synchronize access to shared variablespki2Conn         map[string]*connection   //connection map, key为pkiID，value为connectiondestinationLocks map[string]*sync.RWMutex //mapping between pkiIDs and locks,// used to prevent concurrent connection establishment to the same remote endpoint
}//构造connectionStore
func newConnStore(connFactory connFactory, logger *logging.Logger) *connectionStore
//从connection map中获取连接，如无则创建并启动连接，并写入connection map中
func (cs *connectionStore) getConnection(peer *RemotePeer) (*connection, error)
//连接数量
func (cs *connectionStore) connNum() int
//关闭指定连接
func (cs *connectionStore) closeConn(peer *RemotePeer)
//关闭所有连接
func (cs *connectionStore) shutdown()
func (cs *connectionStore) onConnected(serverStream proto.Gossip_GossipStreamServer, connInfo *proto.ConnectionInfo) *connection
//注册连接
func (cs *connectionStore) registerConn(connInfo *proto.ConnectionInfo, serverStream proto.Gossip_GossipStreamServer) *connection
//关闭指定连接
func (cs *connectionStore) closeByPKIid(pkiID common.PKIidType)
//代码在gossip/comm/conn.go

6.2.1、func (cs connectionStore) getConnection(peer RemotePeer) (*connection, error)

func (cs *connectionStore) getConnection(peer *RemotePeer) (*connection, error) {cs.RLock()isClosing := cs.isClosingcs.RUnlock()pkiID := peer.PKIIDendpoint := peer.Endpointcs.Lock()destinationLock, hasConnected := cs.destinationLocks[string(pkiID)]if !hasConnected {destinationLock = &sync.RWMutex{}cs.destinationLocks[string(pkiID)] = destinationLock}cs.Unlock()destinationLock.Lock()cs.RLock()//从connection map中获取conn, exists := cs.pki2Conn[string(pkiID)]if exists {cs.RUnlock()destinationLock.Unlock()return conn, nil}cs.RUnlock()//创建连接createdConnection, err := cs.connFactory.createConnection(endpoint, pkiID)destinationLock.Unlock()conn = createdConnectioncs.pki2Conn[string(createdConnection.pkiID)] = conngo conn.serviceConnection() //启动连接的消息接收处理、以及向对方节点发送消息return conn, nil
}
//代码在gossip/comm/conn.go

7、ChannelDeMultiplexer结构体及方法（多路复用器）

type ChannelDeMultiplexer struct {channels []*channellock     *sync.RWMutexclosed   int32
}//构造ChannelDeMultiplexer
func NewChannelDemultiplexer() *ChannelDeMultiplexer
//atomic.LoadInt32(&m.closed) == int32(1)
func (m *ChannelDeMultiplexer) isClosed() bool
//关闭
func (m *ChannelDeMultiplexer) Close()
//添加通道
func (m *ChannelDeMultiplexer) AddChannel(predicate common.MessageAcceptor) chan interface{}
//挨个通道发送消息
func (m *ChannelDeMultiplexer) DeMultiplex(msg interface{})