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
// Encode writes an encoded object to a new bytes buffer
func encodeMsgPack(in interface{}) (*bytes.Buffer, error) {
	buf := bytes.NewBuffer(nil)
	hd := codec.MsgpackHandle{}
	enc := codec.NewEncoder(buf, &hd)
	err := enc.Encode(in)
	return buf, err
}
Example #3
0
// Encode writes an encoded object to a new bytes buffer
func encode(msgType messageType, in interface{}) (*bytes.Buffer, error) {
	buf := bytes.NewBuffer(nil)
	buf.WriteByte(uint8(msgType))
	hd := codec.MsgpackHandle{}
	enc := codec.NewEncoder(buf, &hd)
	err := enc.Encode(in)
	return buf, err
}
Example #4
0
func encodeFilter(f filterType, filt interface{}) ([]byte, error) {
	buf := bytes.NewBuffer(nil)
	buf.WriteByte(uint8(f))

	handle := codec.MsgpackHandle{}
	encoder := codec.NewEncoder(buf, &handle)
	err := encoder.Encode(filt)
	return buf.Bytes(), err
}
Example #5
0
func encodeMessage(t messageType, msg interface{}) ([]byte, error) {
	buf := bytes.NewBuffer(nil)
	buf.WriteByte(uint8(t))

	handle := codec.MsgpackHandle{}
	encoder := codec.NewEncoder(buf, &handle)
	err := encoder.Encode(msg)
	return buf.Bytes(), err
}
Example #6
0
func MockEncoder(obj interface{}) []byte {
	buf := bytes.NewBuffer(nil)
	encoder := codec.NewEncoder(buf, msgpackHandle)
	err := encoder.Encode(obj)
	if err != nil {
		panic(err)
	}
	return buf.Bytes()
}
Example #7
0
func (m *MockSnapshot) Persist(sink SnapshotSink) error {
	hd := codec.MsgpackHandle{}
	enc := codec.NewEncoder(sink, &hd)
	if err := enc.Encode(m.logs[:m.maxIndex]); err != nil {
		sink.Cancel()
		return err
	}
	sink.Close()
	return nil
}
Example #8
0
// encodeTags is used to encode a tag map
func (s *Serf) encodeTags(tags map[string]string) []byte {
	// Support role-only backwards compatibility
	if s.ProtocolVersion() < 3 {
		role := tags["role"]
		return []byte(role)
	}

	// Use a magic byte prefix and msgpack encode the tags
	var buf bytes.Buffer
	buf.WriteByte(tagMagicByte)
	enc := codec.NewEncoder(&buf, &codec.MsgpackHandle{})
	if err := enc.Encode(tags); err != nil {
		panic(fmt.Sprintf("Failed to encode tags: %v", err))
	}
	return buf.Bytes()
}
Example #9
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 #10
0
func (s *consulSnapshot) Persist(sink raft.SnapshotSink) error {
	defer metrics.MeasureSince([]string{"consul", "fsm", "persist"}, time.Now())
	// Register the nodes
	encoder := codec.NewEncoder(sink, msgpackHandle)

	// Write the header
	header := snapshotHeader{
		LastIndex: s.state.LastIndex(),
	}
	if err := encoder.Encode(&header); err != nil {
		sink.Cancel()
		return err
	}

	if err := s.persistNodes(sink, encoder); err != nil {
		sink.Cancel()
		return err
	}

	if err := s.persistSessions(sink, encoder); err != nil {
		sink.Cancel()
		return err
	}

	if err := s.persistACLs(sink, encoder); err != nil {
		sink.Cancel()
		return err
	}

	if err := s.persistKV(sink, encoder); err != nil {
		sink.Cancel()
		return err
	}

	if err := s.persistTombstones(sink, encoder); err != nil {
		sink.Cancel()
		return err
	}
	return nil
}
Example #11
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 #12
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 #13
0
// Encode is used to encode a MsgPack object with type prefix
func Encode(t MessageType, msg interface{}) ([]byte, error) {
	var buf bytes.Buffer
	buf.WriteByte(uint8(t))
	err := codec.NewEncoder(&buf, msgpackHandle).Encode(msg)
	return buf.Bytes(), err
}
Example #14
0
// sendLocalState is invoked to send our local state over a tcp connection
func (m *Memberlist) sendLocalState(conn net.Conn, join bool) error {
	// Setup a deadline
	conn.SetDeadline(time.Now().Add(m.config.TCPTimeout))

	// Prepare the local node state
	m.nodeLock.RLock()
	localNodes := make([]pushNodeState, len(m.nodes))
	for idx, n := range m.nodes {
		localNodes[idx].Name = n.Name
		localNodes[idx].Addr = n.Addr
		localNodes[idx].Port = n.Port
		localNodes[idx].Incarnation = n.Incarnation
		localNodes[idx].State = n.State
		localNodes[idx].Meta = n.Meta
		localNodes[idx].Vsn = []uint8{
			n.PMin, n.PMax, n.PCur,
			n.DMin, n.DMax, n.DCur,
		}
	}
	m.nodeLock.RUnlock()

	// Get the delegate state
	var userData []byte
	if m.config.Delegate != nil {
		userData = m.config.Delegate.LocalState(join)
	}

	// Create a bytes buffer writer
	bufConn := bytes.NewBuffer(nil)

	// Send our node state
	header := pushPullHeader{Nodes: len(localNodes), UserStateLen: len(userData), Join: join}
	hd := codec.MsgpackHandle{}
	enc := codec.NewEncoder(bufConn, &hd)

	// Begin state push
	if _, err := bufConn.Write([]byte{byte(pushPullMsg)}); err != nil {
		return err
	}

	if err := enc.Encode(&header); err != nil {
		return err
	}
	for i := 0; i < header.Nodes; i++ {
		if err := enc.Encode(&localNodes[i]); err != nil {
			return err
		}
	}

	// Write the user state as well
	if userData != nil {
		if _, err := bufConn.Write(userData); err != nil {
			return err
		}
	}

	// Get the send buffer
	sendBuf := bufConn.Bytes()

	// Check if compresion is enabled
	if m.config.EnableCompression {
		compBuf, err := compressPayload(bufConn.Bytes())
		if err != nil {
			m.logger.Printf("[ERROR] memberlist: Failed to compress local state: %v", err)
		} else {
			sendBuf = compBuf.Bytes()
		}
	}

	// Check if encryption is enabled
	if m.config.EncryptionEnabled() {
		crypt, err := m.encryptLocalState(sendBuf)
		if err != nil {
			m.logger.Printf("[ERROR] memberlist: Failed to encrypt local state: %v", err)
			return err
		}
		sendBuf = crypt
	}

	// Write out the entire send buffer
	metrics.IncrCounter([]string{"memberlist", "tcp", "sent"}, float32(len(sendBuf)))
	if _, err := conn.Write(sendBuf); err != nil {
		return err
	}
	return nil
}
Example #15
0
func TestTCPPushPull(t *testing.T) {
	m := GetMemberlist(t)
	defer m.Shutdown()
	m.nodes = append(m.nodes, &nodeState{
		Node: Node{
			Name: "Test 0",
			Addr: net.ParseIP(m.config.BindAddr),
			Port: uint16(m.config.BindPort),
		},
		Incarnation: 0,
		State:       stateSuspect,
		StateChange: time.Now().Add(-1 * time.Second),
	})

	addr := fmt.Sprintf("%s:%d", m.config.BindAddr, m.config.BindPort)
	conn, err := net.Dial("tcp", addr)
	if err != nil {
		t.Fatalf("unexpected err %s", err)
	}
	defer conn.Close()

	localNodes := make([]pushNodeState, 3)
	localNodes[0].Name = "Test 0"
	localNodes[0].Addr = net.ParseIP(m.config.BindAddr)
	localNodes[0].Port = uint16(m.config.BindPort)
	localNodes[0].Incarnation = 1
	localNodes[0].State = stateAlive
	localNodes[1].Name = "Test 1"
	localNodes[1].Addr = net.ParseIP(m.config.BindAddr)
	localNodes[1].Port = uint16(m.config.BindPort)
	localNodes[1].Incarnation = 1
	localNodes[1].State = stateAlive
	localNodes[2].Name = "Test 2"
	localNodes[2].Addr = net.ParseIP(m.config.BindAddr)
	localNodes[2].Port = uint16(m.config.BindPort)
	localNodes[2].Incarnation = 1
	localNodes[2].State = stateAlive

	// Send our node state
	header := pushPullHeader{Nodes: 3}
	hd := codec.MsgpackHandle{}
	enc := codec.NewEncoder(conn, &hd)

	// Send the push/pull indicator
	conn.Write([]byte{byte(pushPullMsg)})

	if err := enc.Encode(&header); err != nil {
		t.Fatalf("unexpected err %s", err)
	}
	for i := 0; i < header.Nodes; i++ {
		if err := enc.Encode(&localNodes[i]); err != nil {
			t.Fatalf("unexpected err %s", err)
		}
	}

	// Read the message type
	var msgType messageType
	if err := binary.Read(conn, binary.BigEndian, &msgType); err != nil {
		t.Fatalf("unexpected err %s", err)
	}

	var bufConn io.Reader = conn
	msghd := codec.MsgpackHandle{}
	dec := codec.NewDecoder(bufConn, &msghd)

	// Check if we have a compressed message
	if msgType == compressMsg {
		var c compress
		if err := dec.Decode(&c); err != nil {
			t.Fatalf("unexpected err %s", err)
		}
		decomp, err := decompressBuffer(&c)
		if err != nil {
			t.Fatalf("unexpected err %s", 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 {
		t.Fatalf("bad message type")
	}

	if err := dec.Decode(&header); err != nil {
		t.Fatalf("unexpected err %s", 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 {
			t.Fatalf("unexpected err %s", err)
		}
	}

	if len(remoteNodes) != 1 {
		t.Fatalf("bad response")
	}

	n := &remoteNodes[0]
	if n.Name != "Test 0" {
		t.Fatalf("bad name")
	}
	if bytes.Compare(n.Addr, net.ParseIP(m.config.BindAddr)) != 0 {
		t.Fatal("bad addr")
	}
	if n.Incarnation != 0 {
		t.Fatal("bad incarnation")
	}
	if n.State != stateSuspect {
		t.Fatal("bad state")
	}
}
Example #16
0
// encodeMsgPack is used to encode an object with msgpack
func encodeMsgPack(msg interface{}) ([]byte, error) {
	var buf bytes.Buffer
	err := codec.NewEncoder(&buf, msgpackHandle).Encode(msg)
	return buf.Bytes(), err
}