github.com/braveheart12/insolar-09-08-19@v0.8.7/network/transport/tcp.go

/*
 * The Clear BSD License
 *
 * Copyright (c) 2019 Insolar Technologies
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted (subject to the limitations in the disclaimer below) provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *  Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *  Neither the name of Insolar Technologies nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 *
 * NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

package transport

import (
	"context"
	"io"
	"net"
	"strings"

	"github.com/pkg/errors"

	"github.com/insolar/insolar/instrumentation/inslogger"
	"github.com/insolar/insolar/log"
	"github.com/insolar/insolar/metrics"
	"github.com/insolar/insolar/network/transport/pool"
	"github.com/insolar/insolar/network/transport/relay"
	"github.com/insolar/insolar/network/utils"
)

type tcpTransport struct {
	baseTransport

	pool     pool.ConnectionPool
	listener net.Listener
	address  string
}

func newTCPTransport(listener net.Listener, proxy relay.Proxy, publicAddress string) (*tcpTransport, error) {
	transport := &tcpTransport{
		baseTransport: newBaseTransport(proxy, publicAddress),
		listener:      listener,
		pool:          pool.NewConnectionPool(&tcpConnectionFactory{}),
	}

	transport.sendFunc = transport.send

	return transport, nil
}

func (t *tcpTransport) send(address string, data []byte) error {
	ctx := context.Background()
	logger := inslogger.FromContext(ctx)

	addr, err := net.ResolveTCPAddr("tcp", address)
	if err != nil {
		return errors.Wrap(err, "[ send ] Failed to resolve net address")
	}

	conn, err := t.pool.GetConnection(ctx, addr)
	if err != nil {
		return errors.Wrap(err, "[ send ] Failed to get connection")
	}

	logger.Debug("[ send ] len = ", len(data))

	n, err := conn.Write(data)

	if err != nil {
		t.pool.CloseConnection(ctx, addr)
		conn, err = t.pool.GetConnection(ctx, addr)
		if err != nil {
			return errors.Wrap(err, "[ send ] Failed to get connection")
		}
		n, err = conn.Write(data)
	}

	if err == nil {
		metrics.NetworkSentSize.Add(float64(n))
		return nil
	}
	return errors.Wrap(err, "[ send ] Failed to write data")
}

func (t *tcpTransport) prepareListen() (net.Listener, error) {
	t.mutex.Lock()
	defer t.mutex.Unlock()

	t.disconnectStarted = make(chan bool, 1)
	t.disconnectFinished = make(chan bool, 1)

	if t.listener != nil {
		t.address = t.listener.Addr().String()
	} else {
		var err error
		t.listener, err = net.Listen("tcp", t.address)
		if err != nil {
			return nil, errors.Wrap(err, "failed to listen TCP")
		}
	}

	return t.listener, nil
}

// Start starts networking.
func (t *tcpTransport) Listen(ctx context.Context) error {
	logger := inslogger.FromContext(ctx)
	logger.Info("[ Listen ] Start TCP transport")

	listener, err := t.prepareListen()
	if err != nil {
		logger.Info("[ Listen ] Failed to prepare TCP transport: ", err.Error())
		return err
	}

	go func() {
		for {
			conn, err := listener.Accept()
			if err != nil {
				<-t.disconnectFinished
				if strings.Contains(strings.ToLower(err.Error()), "use of closed network connection") {
					logger.Info("Connection closed, quiting accept loop")
					return
				}

				logger.Error("[ Listen ] Failed to accept connection: ", err.Error())
				return
			}

			logger.Debugf("[ Listen ] Accepted new connection from %s", conn.RemoteAddr())

			go t.handleAcceptedConnection(conn)
		}

	}()

	return nil
}

// Stop stops networking.
func (t *tcpTransport) Stop() {
	t.mutex.Lock()
	defer t.mutex.Unlock()

	log.Info("[ Stop ] Stop TCP transport")
	t.prepareDisconnect()

	if t.listener != nil {
		utils.CloseVerbose(t.listener)
		t.listener = nil
	}
	t.pool.Reset()
}

func (t *tcpTransport) handleAcceptedConnection(conn net.Conn) {
	defer utils.CloseVerbose(conn)

	for {
		msg, err := t.serializer.DeserializePacket(conn)

		if err != nil {
			if err == io.EOF || err == io.ErrUnexpectedEOF {
				log.Warn("[ handleAcceptedConnection ] Connection closed by peer")
				return
			}

			log.Error("[ handleAcceptedConnection ] Failed to deserialize packet: ", err.Error())
		} else {
			ctx, logger := inslogger.WithTraceField(context.Background(), msg.TraceID)
			logger.Debug("[ handleAcceptedConnection ] Handling packet: ", msg.RequestID)

			go t.packetHandler.Handle(ctx, msg)
		}
	}
}

type tcpConnectionFactory struct{}

func (*tcpConnectionFactory) CreateConnection(ctx context.Context, address net.Addr) (net.Conn, error) {
	logger := inslogger.FromContext(ctx)
	tcpAddress, ok := address.(*net.TCPAddr)
	if !ok {
		return nil, errors.New("[ createConnection ] Failed to get tcp address")
	}

	conn, err := net.DialTCP("tcp", nil, tcpAddress)
	if err != nil {
		logger.Errorf("[ createConnection ] Failed to open connection to %s: %s", address, err.Error())
		return nil, errors.Wrap(err, "[ createConnection ] Failed to open connection")
	}

	err = conn.SetKeepAlive(true)
	if err != nil {
		logger.Error("[ createConnection ] Failed to set keep alive")
	}

	err = conn.SetNoDelay(true)
	if err != nil {
		logger.Error("[ createConnection ] Failed to set connection no delay: ", err.Error())
	}

	return conn, nil
}