golang-socketio/server.go

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package gosocketio
import (
"bytes"
"crypto/md5"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
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"github.com/graarh/golang-socketio/protocol"
"github.com/graarh/golang-socketio/transport"
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"math/rand"
"net/http"
"sync"
"time"
)
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const (
HeaderForward = "X-Forwarded-For"
)
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var (
ErrorServerNotSet = errors.New("Server not set")
ErrorConnectionNotFound = errors.New("Connection not found")
)
/**
socket.io server instance
*/
type Server struct {
methods
http.Handler
channels map[string]map[*Channel]struct{}
rooms map[*Channel]map[string]struct{}
channelsLock sync.RWMutex
sids map[string]*Channel
sidsLock sync.RWMutex
tr transport.Transport
}
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/**
Get ip of socket client
*/
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func (c *Channel) Ip() string {
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forward := c.RequestHeader().Get(HeaderForward)
if forward != "" {
return forward
}
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return c.ip
}
/**
Get request header of this connection
*/
func (c *Channel) RequestHeader() http.Header {
return c.requestHeader
}
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/**
Get channel by it's sid
*/
func (s *Server) GetChannel(sid string) (*Channel, error) {
s.sidsLock.RLock()
defer s.sidsLock.RUnlock()
c, ok := s.sids[sid]
if !ok {
return nil, ErrorConnectionNotFound
}
return c, nil
}
/**
Join this channel to given room
*/
func (c *Channel) Join(room string) error {
if c.server == nil {
return ErrorServerNotSet
}
c.server.channelsLock.Lock()
defer c.server.channelsLock.Unlock()
cn := c.server.channels
if _, ok := cn[room]; !ok {
cn[room] = make(map[*Channel]struct{})
}
byRoom := c.server.rooms
if _, ok := byRoom[c]; !ok {
byRoom[c] = make(map[string]struct{})
}
cn[room][c] = struct{}{}
byRoom[c][room] = struct{}{}
return nil
}
/**
Remove this channel from given room
*/
func (c *Channel) Leave(room string) error {
if c.server == nil {
return ErrorServerNotSet
}
c.server.channelsLock.Lock()
defer c.server.channelsLock.Unlock()
cn := c.server.channels
if _, ok := cn[room]; ok {
delete(cn[room], c)
if len(cn[room]) == 0 {
delete(cn, room)
}
}
byRoom := c.server.rooms
if _, ok := byRoom[c]; ok {
delete(byRoom[c], room)
}
return nil
}
/**
Get amount of channels, joined to given room, using channel
*/
func (c *Channel) Amount(room string) int {
if c.server == nil {
return 0
}
return c.server.Amount(room)
}
/**
Get amount of channels, joined to given room, using server
*/
func (s *Server) Amount(room string) int {
s.channelsLock.RLock()
defer s.channelsLock.RUnlock()
roomChannels, _ := s.channels[room]
return len(roomChannels)
}
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/**
Get list of channels, joined to given room, using channel
*/
func (c *Channel) List(room string) []*Channel {
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if c.server == nil {
return []*Channel{}
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}
return c.server.List(room)
}
/**
Get list of channels, joined to given room, using server
*/
func (s *Server) List(room string) []*Channel {
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s.channelsLock.RLock()
defer s.channelsLock.RUnlock()
roomChannels, ok := s.channels[room]
if !ok {
return []*Channel{}
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}
i := 0
roomChannelsCopy := make([]*Channel, len(roomChannels))
for channel := range roomChannels {
roomChannelsCopy[i] = channel
i++
}
return roomChannelsCopy
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}
func (c *Channel) BroadcastTo(room, method string, args interface{}) {
if c.server == nil {
return
}
c.server.BroadcastTo(room, method, args)
}
/**
Broadcast message to all room channels
*/
func (s *Server) BroadcastTo(room, method string, args interface{}) {
s.channelsLock.RLock()
defer s.channelsLock.RUnlock()
roomChannels, ok := s.channels[room]
if !ok {
return
}
for cn := range roomChannels {
if cn.IsAlive() {
go cn.Emit(method, args)
}
}
}
/**
Broadcast to all clients
*/
func (s *Server) BroadcastToAll(method string, args interface{}) {
s.sidsLock.RLock()
defer s.sidsLock.RUnlock()
for _, cn := range s.sids {
if cn.IsAlive() {
go cn.Emit(method, args)
}
}
}
/**
Generate new id for socket.io connection
*/
func generateNewId(custom string) string {
hash := fmt.Sprintf("%s %s %n %n", custom, time.Now(), rand.Uint32(), rand.Uint32())
buf := bytes.NewBuffer(nil)
sum := md5.Sum([]byte(hash))
encoder := base64.NewEncoder(base64.URLEncoding, buf)
encoder.Write(sum[:])
encoder.Close()
return buf.String()[:20]
}
/**
On connection system handler, store sid
*/
func onConnectStore(c *Channel) {
c.server.sidsLock.Lock()
defer c.server.sidsLock.Unlock()
c.server.sids[c.Id()] = c
}
/**
On disconnection system handler, clean joins and sid
*/
func onDisconnectCleanup(c *Channel) {
c.server.channelsLock.Lock()
defer c.server.channelsLock.Unlock()
cn := c.server.channels
byRoom, ok := c.server.rooms[c]
if ok {
for room := range byRoom {
if curRoom, ok := cn[room]; ok {
delete(curRoom, c)
if len(curRoom) == 0 {
delete(cn, room)
}
}
}
delete(c.server.rooms, c)
}
c.server.sidsLock.Lock()
defer c.server.sidsLock.Unlock()
delete(c.server.sids, c.Id())
}
func (s *Server) SendOpenSequence(c *Channel) {
jsonHdr, err := json.Marshal(&c.header)
if err != nil {
panic(err)
}
c.out <- protocol.MustEncode(
&protocol.Message{
Type: protocol.MessageTypeOpen,
Args: string(jsonHdr),
},
)
c.out <- protocol.MustEncode(&protocol.Message{Type: protocol.MessageTypeEmpty})
}
/**
Setup event loop for given connection
*/
func (s *Server) SetupEventLoop(conn transport.Connection, remoteAddr string,
requestHeader http.Header) {
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interval, timeout := conn.PingParams()
hdr := Header{
Sid: generateNewId(remoteAddr),
Upgrades: []string{},
PingInterval: int(interval / time.Millisecond),
PingTimeout: int(timeout / time.Millisecond),
}
c := &Channel{}
c.conn = conn
c.ip = remoteAddr
c.requestHeader = requestHeader
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c.initChannel()
c.server = s
c.header = hdr
s.SendOpenSequence(c)
go inLoop(c, &s.methods)
go outLoop(c, &s.methods)
s.callLoopEvent(c, OnConnection)
}
/**
implements ServeHTTP function from http.Handler
*/
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
conn, err := s.tr.HandleConnection(w, r)
if err != nil {
return
}
s.SetupEventLoop(conn, r.RemoteAddr, r.Header)
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s.tr.Serve(w, r)
}
/**
Get amount of current connected sids
*/
func (s *Server) AmountOfSids() int64 {
s.sidsLock.RLock()
defer s.sidsLock.RUnlock()
return int64(len(s.sids))
}
/**
Get amount of rooms with at least one channel(or sid) joined
*/
func (s *Server) AmountOfRooms() int64 {
s.channelsLock.RLock()
defer s.channelsLock.RUnlock()
return int64(len(s.channels))
}
/**
Create new socket.io server
*/
func NewServer(tr transport.Transport) *Server {
s := Server{}
s.initMethods()
s.tr = tr
s.channels = make(map[string]map[*Channel]struct{})
s.rooms = make(map[*Channel]map[string]struct{})
s.sids = make(map[string]*Channel)
s.onConnection = onConnectStore
s.onDisconnection = onDisconnectCleanup
return &s
}