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session.go
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session.go
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package socketio
import (
"crypto/rand"
"errors"
"io"
"io/ioutil"
"net"
"sync"
"time"
)
const (
SessionIDLength = 16
SessionIDCharset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
)
var NotConnected = errors.New("not connected")
type Session struct {
SessionId string
mutex sync.Mutex
emitters map[string]*EventEmitter
nameSpaces map[string]*NameSpace
transport Transport
heartbeatTimeout time.Duration
connectionTimeout time.Duration
peerLast time.Time
lastCheck time.Time
sendHeartBeat bool
defaultNS *NameSpace
Values map[interface{}]interface{}
}
func NewSessionID() string {
b := make([]byte, SessionIDLength)
if _, err := io.ReadFull(rand.Reader, b); err != nil {
return ""
}
for i := 0; i < SessionIDLength; i++ {
b[i] = SessionIDCharset[b[i]%uint8(len(SessionIDCharset))]
}
return string(b)
}
func NewSession(emitters map[string]*EventEmitter, sessionId string, timeout int, sendHeartbeat bool) *Session {
ret := &Session{
emitters: emitters,
SessionId: sessionId,
nameSpaces: make(map[string]*NameSpace),
sendHeartBeat: sendHeartbeat,
heartbeatTimeout: time.Duration(timeout) * time.Second * 2 / 3,
connectionTimeout: time.Duration(timeout) * time.Second,
Values: make(map[interface{}]interface{}),
}
ret.defaultNS = ret.Of("")
return ret
}
func (ss *Session) Of(name string) (nameSpace *NameSpace) {
ss.mutex.Lock()
defer ss.mutex.Unlock()
if nameSpace = ss.nameSpaces[name]; nameSpace == nil {
ee := ss.emitters[name]
if ee == nil {
ss.emitters[name] = NewEventEmitter()
ee = ss.emitters[name]
}
nameSpace = NewNameSpace(ss, name, ee)
ss.nameSpaces[name] = nameSpace
}
return
}
func (ss *Session) loop() {
err := ss.onOpen()
if err != nil {
return
}
defer func() {
for _, ns := range ss.nameSpaces {
ns.onDisconnect()
}
}()
for {
if err := ss.checkConnection(); err != nil {
return
}
packet, err := ss.getPacket()
if err != nil {
return
}
if packet == nil {
continue
}
if packet.EndPoint() == "" {
if err := ss.onPacket(packet); err != nil {
return
}
}
ns := ss.Of(packet.EndPoint())
if ns == nil {
continue
}
ns.onPacket(packet)
}
}
func (ss *Session) checkConnection() error {
now := time.Now()
if ss.sendHeartBeat && now.Sub(ss.lastCheck) > ss.heartbeatTimeout {
hb := new(heartbeatPacket)
if err := ss.defaultNS.sendPacket(hb); err != nil {
return err
}
ss.lastCheck = now
}
if now.Sub(ss.peerLast) > ss.connectionTimeout {
return NotConnected
}
return nil
}
func (ss *Session) getPacket() (Packet, error) {
reader, err := ss.transport.Read()
if e, ok := err.(net.Error); ok && e.Timeout() {
return nil, nil
}
if err != nil {
return nil, err
}
b, err := ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
return decodePacket(b)
}
func (ss *Session) onPacket(packet Packet) error {
switch packet.(type) {
case *heartbeatPacket:
ss.peerLast = time.Now()
if !ss.sendHeartBeat {
err := ss.defaultNS.sendPacket(new(heartbeatPacket))
if err != nil {
return err
}
ss.lastCheck = time.Now()
}
case *disconnectPacket:
ss.defaultNS.onDisconnect()
return NotConnected
}
return nil
}
func (ss *Session) onOpen() error {
packet := new(connectPacket)
ss.defaultNS.connected = true
err := ss.defaultNS.sendPacket(packet)
ss.defaultNS.emit("connect", ss.defaultNS, nil)
ss.lastCheck, ss.peerLast = time.Now(), time.Now()
return err
}