2016-05-18 22:11:10 +02:00
|
|
|
package gosocketio
|
|
|
|
|
|
|
|
import (
|
|
|
|
"encoding/json"
|
|
|
|
"errors"
|
2016-08-16 02:31:06 +02:00
|
|
|
"net/http"
|
2016-05-18 22:11:10 +02:00
|
|
|
"sync"
|
|
|
|
"time"
|
2018-09-18 17:59:07 +02:00
|
|
|
|
|
|
|
"forge.cadoles.com/Pyxis/golang-socketio/protocol"
|
|
|
|
"forge.cadoles.com/Pyxis/golang-socketio/transport"
|
2016-05-18 22:11:10 +02:00
|
|
|
)
|
|
|
|
|
|
|
|
const (
|
|
|
|
queueBufferSize = 500
|
|
|
|
)
|
|
|
|
|
|
|
|
var (
|
|
|
|
ErrorWrongHeader = errors.New("Wrong header")
|
|
|
|
)
|
|
|
|
|
|
|
|
/**
|
|
|
|
engine.io header to send or receive
|
|
|
|
*/
|
|
|
|
type Header struct {
|
|
|
|
Sid string `json:"sid"`
|
|
|
|
Upgrades []string `json:"upgrades"`
|
|
|
|
PingInterval int `json:"pingInterval"`
|
|
|
|
PingTimeout int `json:"pingTimeout"`
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
socket.io connection handler
|
|
|
|
|
|
|
|
use IsAlive to check that handler is still working
|
|
|
|
use Dial to connect to websocket
|
|
|
|
use In and Out channels for message exchange
|
|
|
|
Close message means channel is closed
|
|
|
|
ping is automatic
|
|
|
|
*/
|
|
|
|
type Channel struct {
|
|
|
|
conn transport.Connection
|
|
|
|
|
|
|
|
out chan string
|
|
|
|
header Header
|
|
|
|
|
|
|
|
alive bool
|
|
|
|
aliveLock sync.Mutex
|
|
|
|
|
|
|
|
ack ackProcessor
|
|
|
|
|
2016-08-16 02:31:06 +02:00
|
|
|
server *Server
|
|
|
|
ip string
|
|
|
|
requestHeader http.Header
|
2016-05-18 22:11:10 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
create channel, map, and set active
|
|
|
|
*/
|
|
|
|
func (c *Channel) initChannel() {
|
|
|
|
//TODO: queueBufferSize from constant to server or client variable
|
|
|
|
c.out = make(chan string, queueBufferSize)
|
|
|
|
c.ack.resultWaiters = make(map[int](chan string))
|
|
|
|
c.alive = true
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
Get id of current socket connection
|
|
|
|
*/
|
|
|
|
func (c *Channel) Id() string {
|
|
|
|
return c.header.Sid
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
Checks that Channel is still alive
|
|
|
|
*/
|
|
|
|
func (c *Channel) IsAlive() bool {
|
2017-03-17 21:09:22 +01:00
|
|
|
c.aliveLock.Lock()
|
|
|
|
defer c.aliveLock.Unlock()
|
|
|
|
|
2016-05-18 22:11:10 +02:00
|
|
|
return c.alive
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
Close channel
|
|
|
|
*/
|
2017-05-10 18:27:25 +02:00
|
|
|
func closeChannel(c *Channel, m *methods, args ...interface{}) error {
|
2016-05-18 22:11:10 +02:00
|
|
|
c.aliveLock.Lock()
|
|
|
|
defer c.aliveLock.Unlock()
|
|
|
|
|
|
|
|
if !c.alive {
|
|
|
|
//already closed
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
c.conn.Close()
|
|
|
|
c.alive = false
|
|
|
|
|
|
|
|
//clean outloop
|
|
|
|
for len(c.out) > 0 {
|
|
|
|
<-c.out
|
|
|
|
}
|
|
|
|
c.out <- protocol.CloseMessage
|
|
|
|
|
|
|
|
m.callLoopEvent(c, OnDisconnection)
|
2016-07-05 20:18:06 +02:00
|
|
|
|
|
|
|
overfloodedLock.Lock()
|
|
|
|
delete(overflooded, c)
|
|
|
|
overfloodedLock.Unlock()
|
|
|
|
|
2016-05-18 22:11:10 +02:00
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
//incoming messages loop, puts incoming messages to In channel
|
|
|
|
func inLoop(c *Channel, m *methods) error {
|
|
|
|
for {
|
|
|
|
pkg, err := c.conn.GetMessage()
|
|
|
|
if err != nil {
|
2017-05-10 18:27:25 +02:00
|
|
|
return closeChannel(c, m, err)
|
2016-05-18 22:11:10 +02:00
|
|
|
}
|
|
|
|
msg, err := protocol.Decode(pkg)
|
|
|
|
if err != nil {
|
2017-05-10 18:27:25 +02:00
|
|
|
closeChannel(c, m, protocol.ErrorWrongPacket)
|
2016-06-22 16:06:51 +02:00
|
|
|
return err
|
2016-05-18 22:11:10 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
switch msg.Type {
|
|
|
|
case protocol.MessageTypeOpen:
|
|
|
|
if err := json.Unmarshal([]byte(msg.Source[1:]), &c.header); err != nil {
|
2017-05-10 18:27:25 +02:00
|
|
|
closeChannel(c, m, ErrorWrongHeader)
|
2016-05-18 22:11:10 +02:00
|
|
|
}
|
|
|
|
m.callLoopEvent(c, OnConnection)
|
|
|
|
case protocol.MessageTypePing:
|
|
|
|
c.out <- protocol.PongMessage
|
|
|
|
case protocol.MessageTypePong:
|
|
|
|
default:
|
|
|
|
go m.processIncomingMessage(c, msg)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
var overflooded map[*Channel]struct{} = make(map[*Channel]struct{})
|
|
|
|
var overfloodedLock sync.Mutex
|
|
|
|
|
|
|
|
func AmountOfOverflooded() int64 {
|
|
|
|
overfloodedLock.Lock()
|
|
|
|
defer overfloodedLock.Unlock()
|
|
|
|
|
|
|
|
return int64(len(overflooded))
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
outgoing messages loop, sends messages from channel to socket
|
|
|
|
*/
|
|
|
|
func outLoop(c *Channel, m *methods) error {
|
|
|
|
for {
|
|
|
|
outBufferLen := len(c.out)
|
2016-08-16 02:31:06 +02:00
|
|
|
if outBufferLen >= queueBufferSize-1 {
|
2017-05-10 18:27:25 +02:00
|
|
|
return closeChannel(c, m, ErrorSocketOverflood)
|
2016-05-18 22:11:10 +02:00
|
|
|
} else if outBufferLen > int(queueBufferSize/2) {
|
|
|
|
overfloodedLock.Lock()
|
|
|
|
overflooded[c] = struct{}{}
|
|
|
|
overfloodedLock.Unlock()
|
|
|
|
} else {
|
|
|
|
overfloodedLock.Lock()
|
|
|
|
delete(overflooded, c)
|
|
|
|
overfloodedLock.Unlock()
|
|
|
|
}
|
|
|
|
|
|
|
|
msg := <-c.out
|
|
|
|
if msg == protocol.CloseMessage {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
err := c.conn.WriteMessage(msg)
|
|
|
|
if err != nil {
|
2017-05-10 18:27:25 +02:00
|
|
|
return closeChannel(c, m, err)
|
2016-05-18 22:11:10 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
Pinger sends ping messages for keeping connection alive
|
|
|
|
*/
|
|
|
|
func pinger(c *Channel) {
|
|
|
|
for {
|
|
|
|
interval, _ := c.conn.PingParams()
|
|
|
|
time.Sleep(interval)
|
|
|
|
if !c.IsAlive() {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
c.out <- protocol.PingMessage
|
|
|
|
}
|
|
|
|
}
|