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ws_conn.go
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ws_conn.go
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package core
import (
"crypto/tls"
"errors"
"net/http"
"net/url"
"sync"
"sync/atomic"
"time"
"github.com/gorilla/websocket"
)
const (
CH_WEBSOCKET_WRITE_SIZE = 100
WEBSOCKET_HANDSHAKE_TIMEOUT = 5
WEBSOCKET_READ_TIMEOUT = 30
WEBSOCKET_TCP_WRITE_BUFFER_SIZE = 524288
WEBSOCKET_TCP_READ_BUFFER_SIZE = 524288
)
var ErrIPNotExist = errors.New("reconnect ip is not exist")
var ErrLoginVerify = errors.New("login verify fail")
var ErrConnectUnknown = errors.New("server unknown error")
var ErrNetwork = errors.New("network error")
type WebSocketConn struct {
up uint64
down uint64
conn *websocket.Conn
wch chan []byte
closed bool
handler map[uint16]func(PolePacket, Conn)
mutex *sync.RWMutex
}
func NewWebSocketConn() *WebSocketConn {
return &WebSocketConn{
conn: nil,
closed: true,
wch: nil,
handler: make(map[uint16]func(PolePacket, Conn)),
mutex: &sync.RWMutex{},
}
}
func (wsc *WebSocketConn) Connect(endpoint string, user string, pwd string, ip string, sni string, skipVerifySSL bool, deviceType string, deviceId string, header http.Header) error {
var err error
tlsconfig := &tls.Config{
InsecureSkipVerify: skipVerifySSL,
ServerName: sni,
}
d := websocket.Dialer{
TLSClientConfig: tlsconfig,
HandshakeTimeout: time.Second * WEBSOCKET_HANDSHAKE_TIMEOUT,
EnableCompression: false,
}
conn, resp, err := d.Dial(endpoint+"?user="+url.QueryEscape(user)+"&pwd="+url.QueryEscape(pwd)+"&ip="+ip+"&deviceType="+deviceType+"&deviceId="+deviceId, header)
if err != nil {
if resp != nil {
if resp.StatusCode == http.StatusBadRequest {
return ErrIPNotExist
} else if resp.StatusCode == http.StatusForbidden {
return ErrLoginVerify
} else {
return ErrConnectUnknown
}
}
plog.Error("websocket connect fail,", err)
return ErrNetwork
}
wsc.mutex.Lock()
defer wsc.mutex.Unlock()
wsc.conn = conn
wsc.wch = make(chan []byte, CH_WEBSOCKET_WRITE_SIZE)
wsc.closed = false
return nil
}
func (wsc *WebSocketConn) Close(flag bool) error {
wsc.mutex.Lock()
defer wsc.mutex.Unlock()
if !wsc.closed {
wsc.closed = true
if wsc.wch != nil {
close(wsc.wch)
}
err := wsc.conn.Close()
if flag {
pkt := make([]byte, POLE_PACKET_HEADER_LEN)
PolePacket(pkt).SetCmd(CMD_CLIENT_CLOSED)
go wsc.dispatch(pkt)
}
return err
}
return nil
}
func (wsc *WebSocketConn) String() string {
return wsc.conn.LocalAddr().String() + "->" + wsc.conn.RemoteAddr().String()
}
func (wsc *WebSocketConn) IsClosed() bool {
return wsc.closed
}
func (wsc *WebSocketConn) SetHandler(cmd uint16, handler func(PolePacket, Conn)) {
wsc.handler[cmd] = handler
}
func (wsc *WebSocketConn) read() {
defer func() {
wsc.Close(true)
}()
defer PanicHandler()
for {
wsc.conn.SetReadDeadline(time.Now().Add(time.Second * WEBSOCKET_READ_TIMEOUT))
mtype, pkt, err := wsc.conn.ReadMessage()
if err != nil {
plog.Error(wsc.String(), " conn read end,status=", err)
return
}
if mtype != websocket.BinaryMessage {
continue
}
atomic.AddUint64(&wsc.down, uint64(len(pkt)))
wsc.dispatch(pkt)
}
}
func (wsc *WebSocketConn) dispatch(pkt []byte) {
ppkt := PolePacket(pkt)
handler, ok := wsc.handler[ppkt.Cmd()]
if ok {
handler(pkt, wsc)
} else {
plog.Error("invalid pkt cmd=", ppkt.Cmd())
}
}
func (wsc *WebSocketConn) drainWriteCh() {
for {
select {
case _, ok := <-wsc.wch:
if !ok {
return
}
default:
return
}
}
}
func (wsc *WebSocketConn) write() {
defer PanicHandler()
defer wsc.drainWriteCh()
for {
pkt, ok := <-wsc.wch
if !ok {
plog.Info(wsc.String(), " channel closed")
return
}
if pkt == nil {
plog.Info(wsc.String(), " exit write process")
return
}
atomic.AddUint64(&wsc.up, uint64(len(pkt)))
err := wsc.conn.WriteMessage(websocket.BinaryMessage, pkt)
if err != nil {
plog.Error(wsc.String(), " conn write end,status=", err)
return
}
}
}
func (wsc *WebSocketConn) GetUpDownBytes() (uint64, uint64) {
return wsc.up, wsc.down
}
func (wsc *WebSocketConn) Send(pkt []byte) {
wsc.mutex.RLock()
defer wsc.mutex.RUnlock()
if wsc.IsClosed() {
plog.Debug("websocket connection is closed,can't send pkt")
return
}
if wsc.wch != nil {
wsc.wch <- pkt
}
}
func (wsc *WebSocketConn) StartProcess() {
go wsc.read()
go wsc.write()
}