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tcp_socket.go
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tcp_socket.go
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package tcpsock
import (
"fmt"
"github.com/civet148/gotools/log"
"github.com/civet148/gotools/parser"
"github.com/civet148/gotools/wss"
"net"
)
type socket struct {
ui *parser.UrlInfo
conn net.Conn
listener net.Listener
closed bool
}
func init() {
_ = wss.Register(wss.SocketType_TCP, NewSocket)
}
func NewSocket(ui *parser.UrlInfo) wss.Socket {
return &socket{
ui: ui,
}
}
func (s *socket) Listen() (err error) {
var network = s.getNetwork()
strAddr := s.ui.GetHost()
log.Debugf("trying listen [%v] protocol [%v]", strAddr, s.ui.GetScheme())
s.listener, err = net.Listen(network, strAddr)
if err != nil {
log.Errorf("listen tcp address [%s] failed", strAddr)
return
}
return
}
func (s *socket) Accept() wss.Socket {
conn, err := s.listener.Accept()
if err != nil {
return nil
}
return &socket{
conn: conn,
}
}
func (s *socket) Connect() (err error) {
var network = s.getNetwork()
addr := s.ui.GetHost()
var tcpAddr *net.TCPAddr
tcpAddr, err = net.ResolveTCPAddr(network, addr)
if err != nil {
log.Errorf("resolve tcp address [%s] failed, error [%s]", addr, err)
return err
}
s.conn, err = net.DialTCP(network, nil, tcpAddr)
if err != nil {
log.Errorf("dial tcp to [%s] failed", addr)
return err
}
return
}
func (s *socket) Send(data []byte, to ...string) (n int, err error) {
return s.conn.Write(data)
}
// length <= 0, default PACK_FRAGMENT_MAX=1500 bytes
func (s *socket) Recv(length int) (data []byte, from string, err error) {
var once bool
var recv, left int
if length <= 0 {
once = true
length = wss.PACK_FRAGMENT_MAX
}
left = length
data = s.makeBuffer(length)
var n int
if once {
if n, err = s.conn.Read(data); err != nil {
log.Errorf("read data error [%v]", err.Error())
return
}
recv = n
} else {
for left > 0 {
if n, err = s.conn.Read(data[recv:]); err != nil {
log.Errorf("read data error [%v]", err.Error())
return
}
left -= n
recv += n
}
}
if recv < length {
data = data[:recv]
}
from = s.conn.RemoteAddr().String()
return
}
func (s *socket) Close() (err error) {
if s.closed {
err = fmt.Errorf("socket already closed")
return
}
if s.conn == nil {
err = fmt.Errorf("socket is nil")
log.Error(err.Error())
return
}
s.closed = true
return s.conn.Close()
}
func (s *socket) GetLocalAddr() string {
if s.conn == nil {
return s.ui.GetHost()
}
return s.conn.LocalAddr().String()
}
func (s *socket) GetRemoteAddr() string {
if s.conn == nil {
return ""
}
return s.conn.RemoteAddr().String()
}
func (s *socket) GetSocketType() wss.SocketType {
return wss.SocketType_TCP
}
func (s *socket) getNetwork() string {
if s.isTcp6() {
return wss.NETWORK_TCPv6
}
return wss.NETWORK_TCPv4
}
func (s *socket) isTcp6() (ok bool) {
scheme := s.ui.GetScheme()
if scheme == wss.URL_SCHEME_TCP6 {
return true
}
return
}
func (s *socket) makeBuffer(length int) []byte {
return make([]byte, length)
}