server/client/socket.go

package client

import (
	"crypto/tls"
	"net"
	"sync"

	"git.loafle.net/commons_go/logging"
	cuc "git.loafle.net/commons_go/util/context"
)

type Socket interface {
	Context() SocketContext

	net.Conn
}

func NewSocket(sb SocketBuilder, parentContext cuc.Context) (Socket, error) {
	if nil == sb {
		logging.Logger().Panicf("Client Socket: SocketBuilder must be specified")
	}
	sb.Validate()

	sc := sb.SocketContext(parentContext)
	if nil == sc {
		logging.Logger().Panicf("Client Socket: SocketContext must be specified")
	}

	sh := sb.GetSocketHandler()
	if nil == sh {
		logging.Logger().Panicf("Client Socket: SocketHandler must be specified")
	}
	sh.Validate()

	network := sb.GetNetwork()
	address := sb.GetAddress()

	conn, err := sb.Dial(network, address)
	if nil != err {
		return nil, err
	}

	tlsConfig := sb.GetTLSConfig()
	if nil != tlsConfig {
		cfg := tlsConfig.Clone()
		tlsConn := tls.Client(conn, cfg)
		if err := tlsConn.Handshake(); err != nil {
			tlsConn.Close()
			return nil, err
		}
		if !cfg.InsecureSkipVerify {
			if err := tlsConn.VerifyHostname(cfg.ServerName); err != nil {
				return nil, err
			}
		}
		conn = tlsConn
	}

	sh.OnConnect(sc, conn)

	s := retainSocket()
	s.Conn = conn
	s.ctx = sc
	s.sh = sh

	return s, nil
}

type netSocket struct {
	net.Conn

	ctx SocketContext
	sh  SocketHandler
}

func (s *netSocket) Context() SocketContext {
	return s.ctx
}

func (s *netSocket) Read(b []byte) (n int, err error) {
	n, err = s.Conn.Read(b)

	logging.Logger().Debugf("Client Socket: read message[%s]", string(b))

	return
}

func (s *netSocket) Write(b []byte) (n int, err error) {
	logging.Logger().Debugf("Client Socket: write message[%s]", string(b))
	return s.Conn.Write(b)
}

func (s *netSocket) Close() error {
	err := s.Conn.Close()
	s.sh.OnDisconnect(s)
	releaseSocket(s)
	return err
}

var socketPool sync.Pool

func retainSocket() *netSocket {
	v := socketPool.Get()
	if v == nil {
		return &netSocket{}
	}
	return v.(*netSocket)
}

func releaseSocket(s *netSocket) {
	s.sh = nil
	s.ctx = nil

	socketPool.Put(s)
}