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|
package socket
import (
"tunnel/pkg/server/queue"
"strings"
"sync"
"fmt"
"log"
"net"
)
type Channel interface {
Send(wq queue.Q) error
Recv(rq queue.Q) error
Close()
}
type S interface {
Open() (Channel, error)
Close()
}
type listenSocket struct {
listen net.Listener
}
type dialSocket struct {
proto, addr string
}
type connChannel struct {
conn net.Conn
once sync.Once
cancel chan struct{}
}
func newConnChannel(conn net.Conn) Channel {
return &connChannel{conn: conn, cancel: make(chan struct{})}
}
func (cc *connChannel) Send(wq queue.Q) (err error) {
defer cc.shutdown(&err)
return queue.IoCopy(cc.conn, wq.Writer())
}
func (cc *connChannel) Recv(rq queue.Q) (err error) {
defer cc.shutdown(&err)
for b := range rq {
for len(b) > 0 {
n, err := cc.conn.Write(b)
if err != nil {
return err
}
b = b[n:]
}
}
return nil
}
func (cc *connChannel) String() string {
addr := cc.conn.RemoteAddr()
return fmt.Sprintf("%s/%s", addr.Network(), addr.String())
}
func (cc *connChannel) isCanceled() bool {
select {
case <- cc.cancel:
return true
default:
return false
}
}
func (cc *connChannel) shutdown(err *error) {
select {
case <- cc.cancel:
*err = nil
default:
cc.once.Do(func () {
close(cc.cancel)
log.Println("close", cc)
if e := cc.conn.Close(); e != nil && *err != nil {
*err = e
}
})
}
}
func (cc *connChannel) Close() {
var err error
cc.shutdown(&err)
}
func newListenSocket(proto, addr string) (S, error) {
if !strings.Contains(addr, ":") {
addr = ":" + addr
}
listen, err := net.Listen(proto, addr)
if err != nil {
return nil, err
}
return &listenSocket{listen: listen}, nil
}
func (s *listenSocket) Open() (Channel, error) {
conn, err := s.listen.Accept()
if err != nil {
return nil, err
}
return newConnChannel(conn), nil
}
func (s *listenSocket) Close() {
s.listen.Close()
}
func newDialSocket(proto, addr string) (S, error) {
return &dialSocket{proto: proto, addr: addr}, nil
}
func (s *dialSocket) Open() (Channel, error) {
conn, err := net.Dial(s.proto, s.addr)
if err != nil {
return nil, err
}
return newConnChannel(conn), nil
}
func (s *dialSocket) Close() {
}
func New(desc string) (S, error) {
args := strings.Split(desc, "/")
if len(args) != 2 {
return nil, fmt.Errorf("bad socket '%s'", desc)
}
proto, addr := args[0], args[1]
switch proto {
case "tcp-listen": return newListenSocket("tcp", addr)
case "tcp": return newDialSocket("tcp", addr)
}
return nil, fmt.Errorf("bad socket '%s': unknown type", desc)
}
|
