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push.go
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push.go
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package main
import (
"code.google.com/p/go.net/websocket"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"runtime/debug"
"time"
)
const (
OK = 0
InternalErr = 65535
AuthErr = 1
MultiCliErr = 2
OKStr = "OK"
InternalErrStr = "Internal Exception"
AuthErrStr = "Authentication Exception"
MultiCliStr = "Multiple Client Connected Exception"
)
var (
errMsg = map[int]string{}
pusher Pusher
protocolErr = errors.New("client must not send any data")
)
type Pusher interface {
Auth(key string) bool
Key(key string) string
}
type DefPusher struct{}
func (p *DefPusher) Auth(key string) bool {
return true
}
func (p *DefPusher) Key(key string) string {
return key
}
func init() {
errMsg[OK] = OKStr
errMsg[InternalErr] = InternalErrStr
errMsg[AuthErr] = AuthErrStr
errMsg[MultiCliErr] = MultiCliStr
pusher = &DefPusher{}
}
func Publish(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "Method Not Allowed", 405)
}
params := r.URL.Query()
key := params.Get("key")
if key == "" {
http.Error(w, "must specified query parameter ?key=your_pub_key", 405)
}
body, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, "read body error", 500)
}
// send to redis
if err = RedisPub(key, string(body)); err != nil {
http.Error(w, "interlanl redis error", 500)
}
}
func SetPusher(p Pusher) {
pusher = p
}
func Subscribe(ws *websocket.Conn) {
var (
result = map[string]interface{}{}
key string
)
defer recoverFunc()
// cleanup on server side
//defer func() {
// if err := ws.Close(); err != nil {
// Log.Printf("wc.Close() failed (%s)", err.Error())
// }
//}()
// set read deadline
err := ws.SetReadDeadline(time.Now().Add(time.Duration(Conf.LongpollingTimeout) * time.Second))
if err != nil {
Log.Printf("ws.SetReadDeadline() failed (%s)", err.Error())
return
}
// get key
if err = websocket.Message.Receive(ws, &key); err != nil {
Log.Printf("websocket.Message.Receive failed (%s)", err.Error())
return
}
// Auth
if !pusher.Auth(key) {
if err = responseWriter(ws, AuthErr, result); err != nil {
Log.Printf("responseWriter failed (%s)", err.Error())
}
return
}
// Generate Key
key = pusher.Key(key)
Log.Printf("Client (%s) subscribe to key %s", ws.Request().RemoteAddr, key)
// check multi cli connected
if Conf.MaxSubscriberPerKey > 0 {
ok, err := multiCliCheck(key)
if err != nil {
if err = responseWriter(ws, InternalErr, result); err != nil {
Log.Printf("responseWriter failed (%s)", err.Error())
}
return
}
defer func() {
if err = RedisDecr(ConnectedKey, key); err != nil {
Log.Printf("RedisDecr(\"%s\", \"%s\") failed (%s)", ConnectedKey, key, err.Error())
}
}()
if !ok {
if err = responseWriter(ws, MultiCliErr, result); err != nil {
Log.Printf("responseWriter failed (%s)", err.Error())
}
return
}
}
// redis routine for receive pub message or error
redisC, psc, err := RedisSub(key)
if err != nil {
Log.Printf("RedisSub(\"%s\") failed (%s)", key, err.Error())
if err = responseWriter(ws, InternalErr, result); err != nil {
Log.Printf("responseWriter failed (%s)", err.Error())
}
return
}
// unsub redis
defer func() {
if err := RedisUnSub(key, psc); err != nil {
Log.Printf("RedisUnSub(\"%s\", psc) failed (%s)", key, err.Error())
}
}()
// create a routine wait for client read(only closed or error) return a channel
netC := netRead(ws)
for {
select {
case err := <-netC:
Log.Printf("websocket.Message.Receive faild (%s)", err.Error())
return
case msg := <-redisC:
if rmsg, ok := msg.(string); ok {
result["data"] = rmsg
if err = responseWriter(ws, OK, result); err != nil {
Log.Printf("responseWriter failed (%s)", err.Error())
// Restore the unsent message
if err = RedisRestore(key, rmsg); err != nil {
Log.Printf("RedisRestore(\"%s\", \"%s\") failed", key, msg)
return
}
return
}
} else if err, ok := msg.(error); ok {
// DEBUG
Log.Printf("Subscribe() failed (%s)", err.Error())
return
} else {
Log.Printf("Unknown msg in RedisSub")
return
}
}
}
}
func multiCliCheck(key string) (bool, error) {
// incr client num
cliNum, err := RedisIncr(ConnectedKey, key)
if err != nil {
Log.Printf("RedisIncr(\"%s\", \"%s\") failed (%s)", ConnectedKey, key, err.Error())
return false, err
}
// check
if cliNum > Conf.MaxSubscriberPerKey {
Log.Printf("key %s has %d subscribers exceed %d", key, cliNum, Conf.MaxSubscriberPerKey)
return false, nil
}
return true, nil
}
func netRead(ws *websocket.Conn) chan error {
c := make(chan error, 1)
// client close or network error, go routine exit
go func() {
// DEBUG
Log.Printf("netRead routine start")
var reply string
if err := websocket.Message.Receive(ws, &reply); err != nil {
Log.Printf("websocket.Message.Receive() failed (%s)", err.Error())
c <- err
} else {
c <- protocolErr
}
// DEBUG
Log.Printf("netRead routine exit")
}()
return c
}
func recoverFunc() {
if err := recover(); err != nil {
Log.Printf("Error : %v, Debug : \n%s", err, string(debug.Stack()))
}
}
func responseWriter(ws *websocket.Conn, ret int, result map[string]interface{}) error {
result["ret"] = ret
result["msg"] = getErrMsg(ret)
strJson, err := json.Marshal(result)
if err != nil {
Log.Printf("json.Marshal(\"%v\") failed", result)
return err
}
respJson := string(strJson)
Log.Printf("Respjson : %s", respJson)
if _, err := ws.Write(strJson); err != nil {
Log.Printf("ws.Write(\"%s\") failed (%s)", respJson, err.Error())
return err
}
return nil
}
func getErrMsg(ret int) string {
if msg, ok := errMsg[ret]; !ok {
return ""
} else {
return msg
}
}