Example #1
0
// getConn is used to get a connection from the pool
func (n *NetworkTransport) getConn(target net.Addr) (*netConn, error) {
	// Check for a pooled conn
	if conn := n.getPooledConn(target); conn != nil {
		return conn, nil
	}

	// Dial a new connection
	conn, err := n.stream.Dial(target.String(), n.timeout)
	if err != nil {
		return nil, err
	}

	// Wrap the conn
	netConn := &netConn{
		target: target,
		conn:   conn,
		r:      bufio.NewReader(conn),
		w:      bufio.NewWriter(conn),
	}

	// Setup encoder/decoders
	netConn.dec = codec.NewDecoder(netConn.r, &codec.MsgpackHandle{})
	netConn.enc = codec.NewEncoder(netConn.w, &codec.MsgpackHandle{})

	// Done
	return netConn, nil
}
Example #2
0
func MockDecoder(buf []byte) interface{} {
	out := new(MockData)
	err := codec.NewDecoder(bytes.NewReader(buf), msgpackHandle).Decode(out)
	if err != nil {
		panic(err)
	}
	return out
}
Example #3
0
func (m *MockFSM) Restore(inp io.ReadCloser) error {
	m.Lock()
	defer m.Unlock()
	defer inp.Close()
	hd := codec.MsgpackHandle{}
	dec := codec.NewDecoder(inp, &hd)

	m.logs = nil
	return dec.Decode(&m.logs)
}
Example #4
0
// decodeTags is used to decode a tag map
func (s *Serf) decodeTags(buf []byte) map[string]string {
	tags := make(map[string]string)

	// Backwards compatibility mode
	if len(buf) == 0 || buf[0] != tagMagicByte {
		tags["role"] = string(buf)
		return tags
	}

	// Decode the tags
	r := bytes.NewReader(buf[1:])
	dec := codec.NewDecoder(r, &codec.MsgpackHandle{})
	if err := dec.Decode(&tags); err != nil {
		s.logger.Printf("[ERR] serf: Failed to decode tags: %v", err)
	}
	return tags
}
Example #5
0
// handleConn is used to handle an inbound connection for its lifespan
func (n *NetworkTransport) handleConn(conn net.Conn) {
	defer conn.Close()
	r := bufio.NewReader(conn)
	w := bufio.NewWriter(conn)
	dec := codec.NewDecoder(r, &codec.MsgpackHandle{})
	enc := codec.NewEncoder(w, &codec.MsgpackHandle{})

	for {
		if err := n.handleCommand(r, dec, enc); err != nil {
			if err != io.EOF {
				n.logger.Printf("[ERR] raft-net: Failed to decode incoming command: %v", err)
			}
			return
		}
		if err := w.Flush(); err != nil {
			n.logger.Printf("[ERR] raft-net: Failed to flush response: %v", err)
			return
		}
	}
}
Example #6
0
// listen is a long running routine that listens for new clients
func (i *AgentRPC) listen() {
	for {
		conn, err := i.listener.Accept()
		if err != nil {
			if i.stop {
				return
			}
			i.logger.Printf("[ERR] agent.rpc: Failed to accept client: %v", err)
			continue
		}
		i.logger.Printf("[INFO] agent.rpc: Accepted client: %v", conn.RemoteAddr())

		// Wrap the connection in a client
		client := &rpcClient{
			name:   conn.RemoteAddr().String(),
			conn:   conn,
			reader: bufio.NewReader(conn),
			writer: bufio.NewWriter(conn),
		}
		client.dec = codec.NewDecoder(client.reader, msgpackHandle)
		client.enc = codec.NewEncoder(client.writer, msgpackHandle)
		if err != nil {
			i.logger.Printf("[ERR] agent.rpc: Failed to create decoder: %v", err)
			conn.Close()
			continue
		}

		// Register the client
		i.Lock()
		if !i.stop {
			i.clients[client.name] = client
			go i.handleClient(client)
		} else {
			conn.Close()
		}
		i.Unlock()
	}
}
Example #7
0
// NewRPCClient is used to create a new RPC client given the address.
// This will properly dial, handshake, and start listening
func NewRPCClient(addr string) (*RPCClient, error) {
	var conn net.Conn
	var err error

	if envAddr := os.Getenv("CONSUL_RPC_ADDR"); envAddr != "" {
		addr = envAddr
	}

	// Try to dial to agent
	mode := "tcp"
	if strings.HasPrefix(addr, "/") {
		mode = "unix"
	}
	if conn, err = net.Dial(mode, addr); err != nil {
		return nil, err
	}

	// Create the client
	client := &RPCClient{
		seq:        0,
		conn:       conn,
		reader:     bufio.NewReader(conn),
		writer:     bufio.NewWriter(conn),
		dispatch:   make(map[uint64]seqHandler),
		shutdownCh: make(chan struct{}),
	}
	client.dec = codec.NewDecoder(client.reader, msgpackHandle)
	client.enc = codec.NewEncoder(client.writer, msgpackHandle)
	go client.listen()

	// Do the initial handshake
	if err := client.handshake(); err != nil {
		client.Close()
		return nil, err
	}
	return client, err
}
Example #8
0
// decodeMsgPack is used to decode a MsgPack encoded object
func decodeMsgPack(buf []byte, out interface{}) error {
	return codec.NewDecoder(bytes.NewReader(buf), msgpackHandle).Decode(out)
}
Example #9
0
func (c *consulFSM) Restore(old io.ReadCloser) error {
	defer old.Close()

	// Create a temporary path for the state store
	tmpPath, err := ioutil.TempDir(c.path, "state")
	if err != nil {
		return err
	}

	// Create a new state store
	state, err := NewStateStorePath(c.gc, tmpPath, c.logOutput)
	if err != nil {
		return err
	}
	c.state.Close()
	c.state = state

	// Create a decoder
	dec := codec.NewDecoder(old, msgpackHandle)

	// Read in the header
	var header snapshotHeader
	if err := dec.Decode(&header); err != nil {
		return err
	}

	// Populate the new state
	msgType := make([]byte, 1)
	for {
		// Read the message type
		_, err := old.Read(msgType)
		if err == io.EOF {
			break
		} else if err != nil {
			return err
		}

		// Decode
		switch structs.MessageType(msgType[0]) {
		case structs.RegisterRequestType:
			var req structs.RegisterRequest
			if err := dec.Decode(&req); err != nil {
				return err
			}
			c.applyRegister(&req, header.LastIndex)

		case structs.KVSRequestType:
			var req structs.DirEntry
			if err := dec.Decode(&req); err != nil {
				return err
			}
			if err := c.state.KVSRestore(&req); err != nil {
				return err
			}

		case structs.SessionRequestType:
			var req structs.Session
			if err := dec.Decode(&req); err != nil {
				return err
			}
			if err := c.state.SessionRestore(&req); err != nil {
				return err
			}

		case structs.ACLRequestType:
			var req structs.ACL
			if err := dec.Decode(&req); err != nil {
				return err
			}
			if err := c.state.ACLRestore(&req); err != nil {
				return err
			}

		case structs.TombstoneRequestType:
			var req structs.DirEntry
			if err := dec.Decode(&req); err != nil {
				return err
			}
			if err := c.state.TombstoneRestore(&req); err != nil {
				return err
			}

		default:
			return fmt.Errorf("Unrecognized msg type: %v", msgType)
		}
	}

	return nil
}
Example #10
0
// Decode reverses the encode operation on a byte slice input
func decodeMsgPack(buf []byte, out interface{}) error {
	r := bytes.NewBuffer(buf)
	hd := codec.MsgpackHandle{}
	dec := codec.NewDecoder(r, &hd)
	return dec.Decode(out)
}
Example #11
0
func decodeMessage(buf []byte, out interface{}) error {
	var handle codec.MsgpackHandle
	return codec.NewDecoder(bytes.NewReader(buf), &handle).Decode(out)
}
Example #12
0
// recvRemoteState is used to read the remote state from a connection
func (m *Memberlist) readRemoteState(conn net.Conn) (bool, []pushNodeState, []byte, error) {
	// Setup a deadline
	conn.SetDeadline(time.Now().Add(m.config.TCPTimeout))

	// Created a buffered reader
	var bufConn io.Reader = bufio.NewReader(conn)

	// Read the message type
	buf := [1]byte{0}
	if _, err := bufConn.Read(buf[:]); err != nil {
		return false, nil, nil, err
	}
	msgType := messageType(buf[0])

	// Check if the message is encrypted
	if msgType == encryptMsg {
		if !m.config.EncryptionEnabled() {
			return false, nil, nil,
				fmt.Errorf("Remote state is encrypted and encryption is not configured")
		}

		plain, err := m.decryptRemoteState(bufConn)
		if err != nil {
			return false, nil, nil, err
		}

		// Reset message type and bufConn
		msgType = messageType(plain[0])
		bufConn = bytes.NewReader(plain[1:])
	} else if m.config.EncryptionEnabled() {
		return false, nil, nil,
			fmt.Errorf("Encryption is configured but remote state is not encrypted")
	}

	// Get the msgPack decoders
	hd := codec.MsgpackHandle{}
	dec := codec.NewDecoder(bufConn, &hd)

	// Check if we have a compressed message
	if msgType == compressMsg {
		var c compress
		if err := dec.Decode(&c); err != nil {
			return false, nil, nil, err
		}
		decomp, err := decompressBuffer(&c)
		if err != nil {
			return false, nil, nil, err
		}

		// Reset the message type
		msgType = messageType(decomp[0])

		// Create a new bufConn
		bufConn = bytes.NewReader(decomp[1:])

		// Create a new decoder
		dec = codec.NewDecoder(bufConn, &hd)
	}

	// Quit if not push/pull
	if msgType != pushPullMsg {
		err := fmt.Errorf("received invalid msgType (%d)", msgType)
		return false, nil, nil, err
	}

	// Read the push/pull header
	var header pushPullHeader
	if err := dec.Decode(&header); err != nil {
		return false, nil, nil, err
	}

	// Allocate space for the transfer
	remoteNodes := make([]pushNodeState, header.Nodes)

	// Try to decode all the states
	for i := 0; i < header.Nodes; i++ {
		if err := dec.Decode(&remoteNodes[i]); err != nil {
			return false, remoteNodes, nil, err
		}
	}

	// Read the remote user state into a buffer
	var userBuf []byte
	if header.UserStateLen > 0 {
		userBuf = make([]byte, header.UserStateLen)
		bytes, err := io.ReadAtLeast(bufConn, userBuf, header.UserStateLen)
		if err == nil && bytes != header.UserStateLen {
			err = fmt.Errorf(
				"Failed to read full user state (%d / %d)",
				bytes, header.UserStateLen)
		}
		if err != nil {
			return false, remoteNodes, nil, err
		}
	}

	// For proto versions < 2, there is no port provided. Mask old
	// behavior by using the configured port
	for idx := range remoteNodes {
		if m.ProtocolVersion() < 2 || remoteNodes[idx].Port == 0 {
			remoteNodes[idx].Port = uint16(m.config.BindPort)
		}
	}

	return header.Join, remoteNodes, userBuf, nil
}