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client.go
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client.go
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package client
import (
"github.com/cnlh/nps/lib/common"
"github.com/cnlh/nps/lib/conn"
"github.com/cnlh/nps/lib/pool"
"github.com/cnlh/nps/vender/github.com/astaxie/beego/logs"
"net"
"os"
"sync"
"time"
)
type TRPClient struct {
svrAddr string
linkMap map[int]*conn.Link
tunnel *conn.Conn
msgTunnel *conn.Conn
bridgeConnType string
stop chan bool
proxyUrl string
sync.Mutex
vKey string
}
//new client
func NewRPClient(svraddr string, vKey string, bridgeConnType string, proxyUrl string) *TRPClient {
return &TRPClient{
svrAddr: svraddr,
linkMap: make(map[int]*conn.Link),
Mutex: sync.Mutex{},
vKey: vKey,
bridgeConnType: bridgeConnType,
stop: make(chan bool),
proxyUrl: proxyUrl,
}
}
//start
func (s *TRPClient) Start() {
go s.linkCleanSession()
retry:
c, err := NewConn(s.bridgeConnType, s.vKey, s.svrAddr, common.WORK_MAIN, s.proxyUrl)
if err != nil {
logs.Error("The connection server failed and will be reconnected in five seconds")
time.Sleep(time.Second * 5)
goto retry
}
logs.Info("Successful connection with server %s", s.svrAddr)
s.processor(c)
}
func (s *TRPClient) Close() {
s.tunnel.Close()
s.stop <- true
for _, v := range s.linkMap {
if v.Conn != nil {
v.Conn.Close()
}
}
}
//处理
func (s *TRPClient) processor(c *conn.Conn) {
go s.dealChan()
go s.getMsgStatus()
for {
flags, err := c.ReadFlag()
if err != nil {
logs.Error("Accept server data error %s, end this service", err.Error())
break
}
switch flags {
case common.VERIFY_EER:
logs.Error("VKey:%s is incorrect, the server refuses to connect, please check", s.vKey)
os.Exit(0)
case common.NEW_CONN:
if link, err := c.GetLinkInfo(); err != nil {
break
} else {
s.Lock()
s.linkMap[link.Id] = link
s.Unlock()
link.MsgConn = s.msgTunnel
go s.linkProcess(link, c)
link.Run(false)
}
case common.RES_CLOSE:
logs.Error("The authentication key is connected by another client or the server closes the client.")
os.Exit(0)
case common.RES_MSG:
logs.Error("Server-side return error")
break
default:
logs.Warn("The error could not be resolved")
break
}
}
c.Close()
s.Close()
}
func (s *TRPClient) linkProcess(link *conn.Link, c *conn.Conn) {
link.Host = common.FormatAddress(link.Host)
//与目标建立连接
server, err := net.DialTimeout(link.ConnType, link.Host, time.Second*3)
if err != nil {
c.WriteFail(link.Id)
logs.Warn("connect to ", link.Host, "error:", err)
return
}
c.WriteSuccess(link.Id)
link.Conn = conn.NewConn(server)
buf := pool.BufPoolCopy.Get().([]byte)
for {
if n, err := server.Read(buf); err != nil {
s.tunnel.SendMsg([]byte(common.IO_EOF), link)
break
} else {
if _, err := s.tunnel.SendMsg(buf[:n], link); err != nil {
c.Close()
break
}
if link.ConnType == common.CONN_UDP {
break
}
}
<-link.StatusCh
}
pool.PutBufPoolCopy(buf)
s.Lock()
s.Unlock()
}
func (s *TRPClient) getMsgStatus() {
var err error
s.msgTunnel, err = NewConn(s.bridgeConnType, s.vKey, s.svrAddr, common.WORK_SEND_STATUS, s.proxyUrl)
if err != nil {
logs.Error("connect to ", s.svrAddr, "error:", err)
return
}
go func() {
for {
if id, err := s.msgTunnel.GetLen(); err != nil {
break
} else {
s.Lock()
if v, ok := s.linkMap[id]; ok {
s.Unlock()
v.StatusCh <- true
} else {
s.Unlock()
}
}
}
}()
<-s.stop
}
//隧道模式处理
func (s *TRPClient) dealChan() {
var err error
s.tunnel, err = NewConn(s.bridgeConnType, s.vKey, s.svrAddr, common.WORK_CHAN, s.proxyUrl)
if err != nil {
logs.Error("connect to ", s.svrAddr, "error:", err)
return
}
go func() {
for {
if id, err := s.tunnel.GetLen(); err != nil {
break
} else {
s.Lock()
if v, ok := s.linkMap[id]; ok {
s.Unlock()
if content, err := s.tunnel.GetMsgContent(v); err != nil {
pool.PutBufPoolCopy(content)
break
} else {
v.MsgCh <- content
}
} else {
s.Unlock()
}
}
}
}()
<-s.stop
}
func (s *TRPClient) linkCleanSession() {
ticker := time.NewTicker(time.Minute * 5)
for {
select {
case <-ticker.C:
s.Lock()
for _, v := range s.linkMap {
if v.FinishUse {
delete(s.linkMap, v.Id)
}
}
s.Unlock()
}
}
}