/
tunnel_v2.go
93 lines (86 loc) · 2.17 KB
/
tunnel_v2.go
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package ssh
import (
"context"
"fmt"
"log"
"net"
"time"
)
type TunnelServerV2 struct {
ctx context.Context
localHost string
remoteHost string
localListener net.Listener
sshCtl *sshController
}
//use ssh connection pool
func NewTunnelServerWithPool(ctx context.Context, localHost, remoteHost string, sshTool *SSHTool) (*TunnelServerV2, error) {
//check local host
listener, err := net.Listen("tcp", localHost)
if err != nil {
return nil, fmt.Errorf("localHost(%s) listen err:%s", localHost, err.Error())
}
//new ssh controller
sshCtl := NewSshController(ctx, sshTool, remoteHost)
if err := sshCtl.Run(); err != nil {
return nil, err
}
//object
server := &TunnelServerV2{
ctx: ctx,
localHost: localHost,
localListener: listener,
remoteHost: remoteHost,
sshCtl: sshCtl,
}
return server, nil
}
func (server *TunnelServerV2) isCanceled() bool {
return server.ctx.Err() != nil
}
func (server *TunnelServerV2) Start() {
//monitor
go server.monitor()
//loop
for {
//accept
conn, err := server.localListener.Accept()
if err != nil {
log.Printf("[error][TunnelServer.localListener] accept err:%s", err.Error())
//not canceled
if !server.isCanceled() {
time.Sleep(time.Second * 3)
continue
}
//canceled
break
}
go server.handleForward(server.ctx, conn)
}
}
func (server *TunnelServerV2) monitor() {
for {
//context is canceled
if server.isCanceled() {
log.Printf("[info][TunnelServer.monitor] context canceled")
if err := server.localListener.Close(); err != nil {
log.Printf("[error][TunnelServer.monitor] server close err:%s", err.Error())
}
break
}
time.Sleep(time.Second * 3)
}
}
func (server *TunnelServerV2) handleForward(ctx context.Context, localConn net.Conn) {
remoteConn, err := server.sshCtl.GetNetConn()
if err != nil {
log.Printf("[error][TunnelServer.handleForward] sshCtl GetNetConn err:%s", err.Error())
return
}
//two node
connNodeLocal := newConnNode(ctx, "local-netConn", localConn)
connNodeRemote := newConnNode(ctx, "remote-netConn", remoteConn)
//routine
go connNodeLocal.WatchPeer(connNodeRemote)
go connNodeRemote.WatchPeer(connNodeLocal)
}