/
TcpClientSession.go
176 lines (151 loc) · 3.88 KB
/
TcpClientSession.go
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package zNet
import (
"context"
"errors"
"fmt"
"io"
"log"
"net"
"sync"
"time"
"github.com/pzqf/zUtil/zAes"
)
type TcpClientSession struct {
conn *net.TCPConn
wg sync.WaitGroup
lastHeartBeat time.Time
ctxCancel context.CancelFunc
aesKey []byte
heartbeatDuration int
}
func (s *TcpClientSession) Init(conn *net.TCPConn, aesKey []byte, heartbeatDuration int) {
s.conn = conn
s.lastHeartBeat = time.Now()
s.aesKey = aesKey
s.heartbeatDuration = heartbeatDuration
}
func (s *TcpClientSession) Start() {
if s.conn == nil {
return
}
ctx, ctxCancel := context.WithCancel(context.Background())
s.ctxCancel = ctxCancel
go s.receive(ctx)
if s.heartbeatDuration > 0 {
go s.heartbeatCheck(ctx)
}
return
}
func (s *TcpClientSession) Close() {
s.ctxCancel()
s.wg.Wait()
}
func (s *TcpClientSession) receive(ctx context.Context) {
s.wg.Add(1)
defer s.ctxCancel()
defer s.wg.Done()
defer Recover()
for {
if ctx.Err() != nil {
break
}
_ = s.conn.SetReadDeadline(time.Now().Add(time.Second * 3))
headBuf := make([]byte, NetPacketHeadSize)
n, err := io.ReadFull(s.conn, headBuf)
if err != nil {
if netErr, ok := err.(net.Error); ok {
if netErr.Timeout() {
continue
}
}
LogPrint(fmt.Sprintf("Client conn read error, error:%v, closed", err))
break
}
if n != NetPacketHeadSize {
LogPrint(fmt.Sprintf("Client conn read error, error:head size error %d, closed", n))
break
}
netPacket := NetPacket{}
if err = netPacket.UnmarshalHead(headBuf); err != nil {
LogPrint("Receive NetPacket,Unmarshal head error", err, len(headBuf))
break
}
if netPacket.DataSize > 0 {
netPacket.Data = make([]byte, int(netPacket.DataSize))
n, err = io.ReadFull(s.conn, netPacket.Data)
if err != nil {
LogPrint(fmt.Sprintf("Client conn read data error,%v, closed", err))
break
}
if netPacket.DataSize != int32(n) {
LogPrint(fmt.Sprintf("Receive NetPacket, Data size error,protoid:%d, DataSize:%d, received:%d",
netPacket.ProtoId, netPacket.DataSize, n))
break
}
}
if netPacket.ProtoId < 0 {
log.Printf("receive NetPacket protoid empty")
continue
}
if netPacket.DataSize > maxPacketDataSize {
LogPrint(fmt.Sprintf("Receive NetPacket, Data size over max size, protoid:%d, data size:%d, max size: %d",
netPacket.ProtoId, netPacket.DataSize, maxPacketDataSize))
continue
}
if netPacket.DataSize > 0 && s.aesKey != nil {
netPacket.Data = zAes.DecryptCBC(netPacket.Data, s.aesKey)
}
err = Dispatcher(s, &netPacket)
if err != nil {
LogPrint(fmt.Sprintf("Dispatcher NetPacket error,%v, ProtoId:%d", err, netPacket.ProtoId))
}
}
s.ctxCancel()
}
func (s *TcpClientSession) Send(protoId int32, data []byte) error {
netPacket := NetPacket{
ProtoId: protoId,
}
if data != nil {
if s.aesKey != nil {
netPacket.Data = zAes.EncryptCBC(data, s.aesKey)
} else {
netPacket.Data = data
}
}
netPacket.DataSize = int32(len(netPacket.Data))
if netPacket.ProtoId <= 0 && netPacket.DataSize < 0 {
return errors.New("send packet illegal")
}
if netPacket.DataSize > maxPacketDataSize {
return errors.New(fmt.Sprintf("send NetPacket, Data size over max size, data size :%d, max size: %d, protoId:%d",
netPacket.DataSize, maxPacketDataSize, protoId))
}
_, err := s.conn.Write(netPacket.Marshal())
if err != nil {
return err
}
s.heartbeatUpdate()
return nil
}
func (s *TcpClientSession) heartbeatUpdate() {
s.lastHeartBeat = time.Now()
}
func (s *TcpClientSession) heartbeatCheck(ctx context.Context) {
s.wg.Add(1)
defer s.wg.Done()
hbd := float64(s.heartbeatDuration)
for {
select {
case <-time.After(30 * time.Second):
if time.Now().Sub(s.lastHeartBeat).Seconds() >= hbd {
_ = s.Send(HeartbeatProtoId, nil)
}
case <-ctx.Done():
return
}
}
}
func (s *TcpClientSession) GetSid() SessionIdType {
return SessionIdType(1)
}