func (r *nodeRPC) handleConn(conn net.Conn) { defer conn.Close() var req rpcRequest if err := api.Decode(&req, conn); err != nil { logrus.Errorf("error handling K/V RPC connection: %v", err) return } logrus.Debugf("Got: %s(%s)", req.Method, req.Args) var h rpcHandlerFunc switch req.Method { case addNode: h = r.addNode case removeNode: h = r.removeNode } if !r.r.IsLeader() { rpcProxyRequest(r.r.Leader(), &req, conn, r.r.tlsConfig) return } var res rpcResponse if err := h(&req); err != nil { res.Err = err.Error() } api.Encode(&res, conn) }
func (s *store) apply(ax *api.Request) error { if !s.r.IsLeader() { return s.forwardToLeader(ax) } buf := bytes.NewBuffer(nil) if err := api.Encode(ax, buf); err != nil { return err } return s.r.Apply(buf.Bytes()) }
// rpc is a helper function for performing RPC requests between nodes func rpc(addr string, msg *rpcRequest, tlsConfig *tls.Config) (*rpcResponse, error) { conn, err := api.Dial(addr, api.RPCMessage, defaultTimeout, tlsConfig, true) if err != nil { return nil, err } if err := api.Encode(msg, conn); err != nil { return nil, err } var res rpcResponse if err := api.Decode(&res, conn); err != nil { return nil, err } return &res, nil }
func (c *client) do(req *api.Request) (*api.Response, error) { conn, err := c.dial() if err != nil { return nil, err } defer conn.Close() if err := api.Encode(&req, conn); err != nil { return nil, err } var res api.Response if err := api.Decode(&res, conn); err != nil { return nil, fmt.Errorf("error decoding response: %v", err) } if res.Err != "" { return nil, fmt.Errorf("store error: %s", res.Err) } return &res, nil }
func (r *clientRPC) handleConn(conn net.Conn) { defer conn.Close() var req api.Request if err := api.Decode(&req, conn); err != nil { logrus.Errorf("error handling K/V RPC connection: %v", err) return } logrus.Debugf("Got: %s(%s)", req.Action, req.Key) var h clientRPCHandlerFn switch req.Action { case api.Get: h = r.Get case api.Put: h = r.Put } api.Encode(h(&req), conn) }
// rpcProxyRequest is a helper function to proxy an rpc request to another node func rpcProxyRequest(addr string, msg *rpcRequest, from io.ReadWriter, tlsConfig *tls.Config) error { conn, err := api.Dial(addr, api.RPCMessage, defaultTimeout, tlsConfig, true) if err != nil { return err } if err := api.Encode(msg, conn); err != nil { return err } chErr := make(chan error, 2) go func() { _, err := io.Copy(from, conn) chErr <- err }() go func() { _, err := io.Copy(conn, from) chErr <- err }() if err := <-chErr; err != nil { return err } return <-chErr }
func (s *storeFSM) Persist(sink raft.SnapshotSink) error { defer sink.Close() s.mu.Lock() defer s.mu.Unlock() return api.Encode(s.data, sink) }