/
janus.go
158 lines (132 loc) · 3.04 KB
/
janus.go
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// Copyright 2018 Cibifang. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package janus
import (
"log"
"net/http"
"time"
"github.com/gorilla/websocket"
"github.com/tidwall/gjson"
)
type Janus struct {
*sessTable
remoteServer string
conn *websocket.Conn
sendChan chan interface{}
close bool
}
var janusDial = websocket.Dialer{
Proxy: http.ProxyFromEnvironment,
HandshakeTimeout: 3 * time.Second,
Subprotocols: []string{"janus-protocol"},
}
func NewJanus(rs string) *Janus {
janus := &Janus{
remoteServer: rs,
sessTable: newSessTable(),
sendChan: make(chan interface{}),
close: true,
}
if err := janus.connect(); err != nil {
log.Printf(
"NewJanus: connect to server `%s` failed, err : `%+v`", rs, err)
return nil
}
janus.close = false
go janus.handleMsg()
return janus
}
func (j *Janus) Close() {
if j.close {
return
}
j.close = true
j.conn.Close()
}
func (j *Janus) connect() error {
conn, _, err := janusDial.Dial(j.remoteServer, nil)
j.conn = conn
return err
}
func (j *Janus) handleMsg() {
readErr := make(chan struct{})
read := make(chan []byte)
go func() {
defer j.Close()
defer close(readErr)
for {
_, msg, err := j.conn.ReadMessage()
if err != nil {
log.Println("handleMsg: c.ReadJSON error: ", err)
break
}
read <- msg
}
}()
var msg []byte
var sendMsg interface{}
loop:
for {
select {
case <-readErr:
break loop
case msg = <-read:
log.Printf("handleMsg: receive message `%s`", msg)
tid := gjson.GetBytes(msg, "transaction").String()
sid := gjson.GetBytes(msg, "session_id")
if !sid.Exists() {
transferServerMsg(tid, msg, j)
break
}
sess, ok := j.Session(sid.Uint())
if !ok {
log.Printf(
"handleMsg: can't find session with id `%d`", sid.Uint())
break
}
hid := gjson.GetBytes(msg, "handle_id")
if !hid.Exists() {
transferServerMsg(tid, msg, sess)
break
}
handle, ok := j.Handle(sid.Uint(), hid.Uint())
if !ok {
log.Printf(
"handleMsg: can't find handle with id `%d`", hid.Uint())
break
}
transferServerMsg(tid, msg, handle)
case sendMsg = <-j.sendChan:
log.Printf("handleMsg: send message `%+v`", sendMsg)
j.conn.WriteJSON(sendMsg)
}
}
}
func (j *Janus) Send(msg interface{}) {
j.sendChan <- msg
}
func (j *Janus) MsgChan(tid string) (msgChan chan []byte, exist bool) {
return j.sessTable.MsgChan(tid)
}
func (j *Janus) DefaultMsgChan() chan []byte {
return j.sessTable.DefaultMsgChan()
}
func (j *Janus) NewSess(id uint64) *Session {
return j.sessTable.newSess(id)
}
func (j *Janus) Session(id uint64) (sess *Session, exist bool) {
sess, exist = j.sessTable.sessions[id]
return sess, exist
}
func (j *Janus) Handle(sid uint64, hid uint64) (*Handle, bool) {
sess, ok := j.sessTable.sessions[sid]
if !ok {
return nil, ok
}
handle, ok := sess.handles[hid]
return handle, ok
}
func (j *Janus) NewTransaction() string {
return j.sessTable.newTransaction()
}