func (self *FoodPriceService) getFoodPrice(username string, args []string) (string, error) {
	if args == nil || len(args) == 0 {
		return "", errors.New("缺少参数!")
	}
	cityOrDistrict := args[0]
	cityCode := self.getCityCode(cityOrDistrict)
	if len(cityCode) > 0 {
		foodPriceMessage, err := self.getCityFoodPrice(cityCode)
		if err != nil {
			l4g.Error("Get city food price failed: %v", err)
			return "", errors.New("获取数据失败！")
		}
		return foodPriceMessage, nil
	}

	districtCode := self.getDistrictCode(cityOrDistrict)
	if len(districtCode) > 0 {
		foodPriceMessage, err := self.getDistrictFoodPrice(districtCode)
		if err != nil {
			l4g.Error("Get district food price failed: %v", err)
			return "", errors.New("获取数据失败！")
		}
		return foodPriceMessage, nil
	}
	return "", errors.New("不支持该城市或地区的菜价查询！")
}

// LoadConfig will try to search around for the corresponding config file.
// It will search /tmp/fileName then attempt ./config/fileName,
// then ../config/fileName and last it will look at fileName
func LoadConfig(fileName string) {

	fileName = findConfigFile(fileName)
	l4g.Info("Loading config file at " + fileName)

	file, err := os.Open(fileName)
	if err != nil {
		panic("Error opening config file=" + fileName + ", err=" + err.Error())
	}

	decoder := json.NewDecoder(file)
	config := Config{}
	err = decoder.Decode(&config)
	if err != nil {
		panic("Error decoding configuration " + err.Error())
	}

	// Check for a valid email for feedback, if not then do [email protected]
	if _, err := mail.ParseAddress(config.EmailSettings.FeedbackEmail); err != nil {
		config.EmailSettings.FeedbackEmail = "[email protected]"
		l4g.Error("Misconfigured feedback email setting: %s", config.EmailSettings.FeedbackEmail)
	}

	configureLog(config.LogSettings)

	Cfg = &config
	SanitizeOptions = getSanitizeOptions()

	// Validates our mail settings
	if err := CheckMailSettings(); err != nil {
		l4g.Error("Email settings are not valid err=%v", err)
	}
}

func (self *ProtobufServer) handleConnection(conn net.Conn) {
	log.Info("ProtobufServer: client connected: %s", conn.RemoteAddr().String())

	message := make([]byte, 0, MAX_REQUEST_SIZE)
	buff := bytes.NewBuffer(message)
	var messageSizeU uint32
	for {
		err := binary.Read(conn, binary.LittleEndian, &messageSizeU)
		if err != nil {
			log.Error("Error reading from connection (%s): %s", conn.RemoteAddr().String(), err)
			self.connectionMapLock.Lock()
			delete(self.connectionMap, conn)
			self.connectionMapLock.Unlock()
			conn.Close()
			return
		}

		messageSize := int64(messageSizeU)
		if messageSize > MAX_REQUEST_SIZE {
			err = self.handleRequestTooLarge(conn, messageSize, buff)
		} else {
			err = self.handleRequest(conn, messageSize, buff)
		}

		if err != nil {
			log.Error("Error, closing connection: %s", err)
			self.connectionMapLock.Lock()
			delete(self.connectionMap, conn)
			self.connectionMapLock.Unlock()
			conn.Close()
			return
		}
		buff.Reset()
	}
}

/**
** subscribe the all connected queues from queue server
** and to be connect the channel and serve the messages to handlers
**/
func (self *QueueServer) ListenAndServe() {
	factor, err := amqp.Factory()
	if err != nil {
		log.Error("Failed to get the queue instance: %s", err)
	}

	pubsub, err := factor.Get(self.ListenAddress)
	if err != nil {
		log.Error("Failed to get the queue instance: %s", err)
	}

	//res := &global.Message{}

	msgChan, _ := pubsub.Sub()
	for msg := range msgChan {
		log.Info(" [x] %q", msg)

		queue1, _ := config.GetString("name")
		if self.ListenAddress == queue1 {
			coordinator.Handler(msg)
		}
	}
	log.Info("Handling message %v", msgChan)
	self.chann = msgChan
}

// Accept accepts connections on the listener and serves requests
// for each incoming connection.  Accept blocks; the caller typically
// invokes it in a go statement.
func acceptTCP(server *Server, lis *net.TCPListener) {
	var (
		conn *net.TCPConn
		err  error
		r    int
	)
	for {
		if conn, err = lis.AcceptTCP(); err != nil {
			// if listener close then return
			log.Error("listener.Accept(\"%s\") error(%v)", lis.Addr().String(), err)
			return
		}
		if err = conn.SetKeepAlive(Conf.TCPKeepalive); err != nil {
			log.Error("conn.SetKeepAlive() error(%v)", err)
			return
		}
		if err = conn.SetReadBuffer(Conf.TCPSndbuf); err != nil {
			log.Error("conn.SetReadBuffer() error(%v)", err)
			return
		}
		if err = conn.SetWriteBuffer(Conf.TCPRcvbuf); err != nil {
			log.Error("conn.SetWriteBuffer() error(%v)", err)
			return
		}
		go serveTCP(server, conn, r)
		if r++; r == maxInt {
			r = 0
		}
	}
}

func CreateUser(c *Context, team *model.Team, user *model.User) *model.User {

	if !utils.Cfg.TeamSettings.EnableUserCreation {
		c.Err = model.NewAppError("CreateUser", "User creation has been disabled. Please ask your systems administrator for details.", "")
		return nil
	}

	channelRole := ""
	if team.Email == user.Email {
		user.Roles = model.ROLE_TEAM_ADMIN
		channelRole = model.CHANNEL_ROLE_ADMIN

		// Below is a speical case where the first user in the entire
		// system is granted the system_admin role instead of admin
		if result := <-Srv.Store.User().GetTotalUsersCount(); result.Err != nil {
			c.Err = result.Err
			return nil
		} else {
			count := result.Data.(int64)
			if count <= 0 {
				user.Roles = model.ROLE_SYSTEM_ADMIN
			}
		}

	} else {
		user.Roles = ""
	}

	user.MakeNonNil()

	if result := <-Srv.Store.User().Save(user); result.Err != nil {
		c.Err = result.Err
		l4g.Error("Couldn't save the user err=%v", result.Err)
		return nil
	} else {
		ruser := result.Data.(*model.User)

		// Soft error if there is an issue joining the default channels
		if err := JoinDefaultChannels(ruser, channelRole); err != nil {
			l4g.Error("Encountered an issue joining default channels user_id=%s, team_id=%s, err=%v", ruser.Id, ruser.TeamId, err)
		}

		addDirectChannelsAndForget(ruser)

		if user.EmailVerified {
			if cresult := <-Srv.Store.User().VerifyEmail(ruser.Id); cresult.Err != nil {
				l4g.Error("Failed to set email verified err=%v", cresult.Err)
			}
		}

		ruser.Sanitize(map[string]bool{})

		// This message goes to every channel, so the channelId is irrelevant
		message := model.NewMessage(team.Id, "", ruser.Id, model.ACTION_NEW_USER)

		PublishAndForget(message)

		return ruser
	}
}

func PostUpdateChannelHeaderMessageAndForget(c *Context, channelId string, oldChannelHeader, newChannelHeader string) {
	go func() {
		uc := Srv.Store.User().Get(c.Session.UserId)

		if uresult := <-uc; uresult.Err != nil {
			l4g.Error("Failed to retrieve user while trying to save update channel header message %v", uresult.Err)
			return
		} else {
			user := uresult.Data.(*model.User)

			var message string
			if oldChannelHeader == "" {
				message = fmt.Sprintf("%s updated the channel header to: %s", user.Username, newChannelHeader)
			} else if newChannelHeader == "" {
				message = fmt.Sprintf("%s removed the channel header (was: %s)", user.Username, oldChannelHeader)
			} else {
				message = fmt.Sprintf("%s updated the channel header from: %s to: %s", user.Username, oldChannelHeader, newChannelHeader)
			}

			post := &model.Post{
				ChannelId: channelId,
				Message:   message,
				Type:      model.POST_HEADER_CHANGE,
			}
			if _, err := CreatePost(c, post, false); err != nil {
				l4g.Error("Failed to post join/leave message %v", err)
			}
		}
	}()
}

func InitWebsocket() (err error) {
	var (
		listener     *net.TCPListener
		addr         *net.TCPAddr
		httpServeMux = http.NewServeMux()
	)
	httpServeMux.Handle("/sub", websocket.Handler(serveWebsocket))
	for _, bind := range Conf.WebsocketBind {
		if addr, err = net.ResolveTCPAddr("tcp4", bind); err != nil {
			log.Error("net.ResolveTCPAddr(\"tcp4\", \"%s\") error(%v)", bind, err)
			return
		}
		if listener, err = net.ListenTCP("tcp4", addr); err != nil {
			log.Error("net.ListenTCP(\"tcp4\", \"%s\") error(%v)", bind, err)
			return
		}
		server := &http.Server{Handler: httpServeMux}
		log.Debug("start websocket listen: \"%s\"", bind)
		go func() {
			if err = server.Serve(listener); err != nil {
				log.Error("server.Serve(\"%s\") error(%v)", bind, err)
				panic(err)
			}
		}()
	}
	return
}

// RegisterTmp create a ephemeral node, and watch it, if node droped then send a SIGQUIT to self.
func RegisterTemp(conn *zk.Conn, fpath string, data []byte) error {
	tpath, err := conn.Create(path.Join(fpath)+"/", data, zk.FlagEphemeral|zk.FlagSequence, zk.WorldACL(zk.PermAll))
	if err != nil {
		log.Error("conn.Create(\"%s\", \"%s\", zk.FlagEphemeral|zk.FlagSequence) error(%v)", fpath, string(data), err)
		return err
	}
	log.Debug("create a zookeeper node:%s", tpath)
	// watch self
	go func() {
		for {
			log.Info("zk path: \"%s\" set a watch", tpath)
			exist, _, watch, err := conn.ExistsW(tpath)
			if err != nil {
				log.Error("zk.ExistsW(\"%s\") error(%v)", tpath, err)
				log.Warn("zk path: \"%s\" set watch failed, kill itself", tpath)
				killSelf()
				return
			}
			if !exist {
				log.Warn("zk path: \"%s\" not exist, kill itself", tpath)
				killSelf()
				return
			}
			event := <-watch
			log.Info("zk path: \"%s\" receive a event %v", tpath, event)
		}
	}()
	return nil
}

// NewMySQLStorage initialize mysql pool and consistency hash ring.
func NewMySQLStorage() *MySQLStorage {
	var (
		err error
		w   int
		nw  []string
		db  *sql.DB
	)
	dbPool := make(map[string]*sql.DB)
	ring := ketama.NewRing(ketamaBase)
	for n, source := range Conf.MySQLSource {
		nw = strings.Split(n, ":")
		if len(nw) != 2 {
			err = errors.New("node config error, it's nodeN:W")
			log.Error("strings.Split(\"%s\", :) failed (%v)", n, err)
			panic(err)
		}
		w, err = strconv.Atoi(nw[1])
		if err != nil {
			log.Error("strconv.Atoi(\"%s\") failed (%v)", nw[1], err)
			panic(err)
		}
		db, err = sql.Open("mysql", source)
		if err != nil {
			log.Error("sql.Open(\"mysql\", %s) failed (%v)", source, err)
			panic(err)
		}
		dbPool[nw[0]] = db
		ring.AddNode(nw[0], w)
	}
	ring.Bake()
	s := &MySQLStorage{pool: dbPool, ring: ring}
	go s.clean()
	return s
}

// hanleTCPConn handle a long live tcp connection.
func handleTcpConn(conn net.Conn, readerChan chan *bufio.Reader) {
	addr := conn.RemoteAddr().String()
	log.Debug("<%s> handleTcpConn routine start", addr)
	reader := newBufioReader(readerChan, conn)
	if args, err := parseCmd(reader); err == nil {
		// return buffer bufio.Reader
		putBufioReader(readerChan, reader)
		switch args[0] {
		case CmdSubscribe:
			subscribeTcpHandle(conn, args[1:])
		default:
			conn.Write(ParamErrorReply)
			log.Warn("<%s> unknown cmd \"%s\"", addr, args[0])
		}
	} else {
		// return buffer bufio.Reader
		putBufioReader(readerChan, reader)
		log.Error("<%s> parseCmd() error(%v)", addr, err)
	}
	// close the connection
	if err := conn.Close(); err != nil {
		log.Error("<%s> conn.Close() error(%v)", addr, err)
	}
	log.Debug("<%s> handleTcpConn routine stop", addr)
}

// GetPrivate implements the Storage GetPrivate method.
func (s *MySQLStorage) GetPrivate(key string, mid int64) ([]*myrpc.Message, error) {
	db := s.getConn(key)
	if db == nil {
		return nil, ErrNoMySQLConn
	}
	now := time.Now().Unix()
	rows, err := db.Query(getPrivateMsgSQL, key, mid)
	if err != nil {
		log.Error("db.Query(\"%s\",\"%s\",%d,now) failed (%v)", getPrivateMsgSQL, key, mid, err)
		return nil, err
	}
	msgs := []*myrpc.Message{}
	for rows.Next() {
		expire := int64(0)
		cmid := int64(0)
		msg := []byte{}
		if err := rows.Scan(&cmid, &expire, &msg); err != nil {
			log.Error("rows.Scan() failed (%v)", err)
			return nil, err
		}
		if now > expire {
			log.Warn("user_key: \"%s\" mid: %d expired", key, cmid)
			continue
		}
		msgs = append(msgs, &myrpc.Message{MsgId: cmid, GroupId: myrpc.PrivateGroupId, Msg: json.RawMessage(msg)})
	}
	return msgs, nil
}

func (self *FoodPriceService) unsubFoodPrice(username string, args []string) (string, error) {
	if args == nil || len(args) == 0 {
		return "", errors.New("缺少参数!")
	}
	cityOrDistrict := self.getCityOrDistrictCode(args[0])
	if len(cityOrDistrict) == 0 {
		return "", errors.New("不支持订阅该城市或地区的菜价！")
	}
	userSubEntity, err := self.dbHelper.GetUserSub(username, cityOrDistrict)
	if err != nil {
		l4g.Error("GetUserSub error in unsubscribe food price: username: %s, error: %v", username, err)
		return "", errors.New("退订失败！")
	}
	if userSubEntity != nil {
		userSubEntity.SubStatus = 0
		updateError := self.dbHelper.UpdateUserSub(userSubEntity)
		if updateError != nil {
			l4g.Error("UpdateUserSub error in unsubscribe food price: username: %s, error: %v", username, err)
			return "", errors.New("退订失败！")
		}
	} else {
		return "未订阅过该城市的空气质量信息！", nil
	}
	return "退订成功！", nil
}

func (self *FoodPriceService) subFoodPrice(username string, args []string) (string, error) {
	if args == nil || len(args) == 0 {
		return "", errors.New("缺少参数!")
	}
	cityOrDistrict := self.getCityOrDistrictCode(args[0])
	if len(cityOrDistrict) == 0 {
		return "", errors.New("不支持订阅该城市或地区的菜价！")
	}
	userSubEntity, err := self.dbHelper.GetUserSub(username, cityOrDistrict)
	if err != nil {
		l4g.Error("GetUserSub error in subscribe food price: username: %s, error: %v", username, err)
		return "", errors.New("订阅失败！")
	}

	if userSubEntity == nil {
		userSubEntity = &UserSubEntity{}
		userSubEntity.Username = username
		userSubEntity.CityOrDistrict = cityOrDistrict
		userSubEntity.SubStatus = 1
		addError := self.dbHelper.AddUserSub(userSubEntity)
		if addError != nil {
			l4g.Error("AddUserSub error in subscribe food price: username: %s, error: %v", username, err)
			return "", errors.New("订阅失败！")
		}
	} else {
		userSubEntity.SubStatus = 1
		updateError := self.dbHelper.UpdateUserSub(userSubEntity)
		if updateError != nil {
			l4g.Error("UpdateUserSub error in subscribe food price: username: %s, error: %v", username, err)
			return "", errors.New("订阅失败！")
		}
	}
	return "订阅成功！", nil
}

// Push push a message to a specified sub key, must goroutine safe.
func Push(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		http.Error(w, "Method Not Allowed", 405)
		return
	}
	body := ""
	res := map[string]interface{}{"ret": OK}
	defer retPWrite(w, r, res, &body, time.Now())
	// param
	bodyBytes, err := ioutil.ReadAll(r.Body)
	if err != nil {
		res["ret"] = InternalErr
		log.Error("ioutil.ReadAll() failed (%v)", err)
		return
	}
	params := r.URL.Query()
	key := params.Get("key")
	log.Debug("push key: \"%s\"", key)
	bucket := DefaultServer.Bucket(key)
	if channel := bucket.Get(key); channel != nil {
		// padding let caller do
		if err = channel.PushMsg(1, OP_SEND_SMS_REPLY, bodyBytes); err != nil {
			res["ret"] = InternalErr
			log.Error("channel.PushMsg() error(%v)", err)
			return
		}
	}
	res["ret"] = OK
	return
}

func (c *DefaultServerCodec) ReadRequestHeader(rd *bufio.Reader, proto *Proto) (err error) {
	if err = binary.Read(rd, binary.BigEndian, &proto.PackLen); err != nil {
		log.Error("packLen: binary.Read() error(%v)", err)
		return
	}
	log.Debug("packLen: %d", proto.PackLen)
	if proto.PackLen > maxPackLen {
		return ErrProtoPackLen
	}
	if err = binary.Read(rd, binary.BigEndian, &proto.HeaderLen); err != nil {
		log.Error("headerLen: binary.Read() error(%v)", err)
		return
	}
	log.Debug("headerLen: %d", proto.HeaderLen)
	if proto.HeaderLen != rawHeaderLen {
		return ErrProtoHeaderLen
	}
	if err = binary.Read(rd, binary.BigEndian, &proto.Ver); err != nil {
		log.Error("protoVer: binary.Read() error(%v)", err)
		return
	}
	log.Debug("protoVer: %d", proto.Ver)
	if err = binary.Read(rd, binary.BigEndian, &proto.Operation); err != nil {
		log.Error("Operation: binary.Read() error(%v)", err)
		return
	}
	log.Debug("operation: %d", proto.Operation)
	if err = binary.Read(rd, binary.BigEndian, &proto.SeqId); err != nil {
		log.Error("seqId: binary.Read() error(%v)", err)
		return
	}
	log.Debug("seqId: %d", proto.SeqId)
	return
}

/*
* SaveAsFile - 保存网页内容
*
* PARAMS:
*   - targetUrl : 目标网址
*   - outputDir : 存储路径
*
* RETURNS:
*   - true, if succeed
*   - false, if failed
*
 */
func SaveAsFile(targetUrl string, outputDir string) bool {
	res, err := http.Get(targetUrl)
	if err != nil {
		return false
	}
	defer res.Body.Close()
	if res.StatusCode != 200 {
		l4g.Error("bad status code: %d, url:%s", res.StatusCode, targetUrl)
		return false
	}
	content, err := ioutil.ReadAll(res.Body)
	if err != nil {
		l4g.Error("read url content%s, err:%s", targetUrl, err)
		return false
	}
	filename := path.Join(outputDir, url.QueryEscape(targetUrl))
	f, err := os.Create(filename)
	if err != nil {
		l4g.Error("create file %s, err:%s", filename, err)
		return false
	}
	defer f.Close()
	f.Write(content)
	return true
}

func (c *DefaultServerCodec) ReadRequestBody(rd *bufio.Reader, proto *Proto) (err error) {
	var (
		n       = int(0)
		t       = int(0)
		bodyLen = int(proto.PackLen - int32(proto.HeaderLen))
	)
	log.Debug("read body len: %d", bodyLen)
	if bodyLen > 0 {
		proto.Body = make([]byte, bodyLen)
		// no deadline, because readheader always incoming calls readbody
		for {
			if t, err = rd.Read(proto.Body[n:]); err != nil {
				log.Error("body: buf.Read() error(%v)", err)
				return
			}
			if n += t; n == bodyLen {
				log.Debug("body: rd.Read() fill ok")
				break
			} else if n < bodyLen {
				log.Debug("body: rd.Read() need %d bytes", bodyLen-n)
			} else {
				log.Error("body: readbytes %d > %d", n, bodyLen)
			}
		}
	} else {
		proto.Body = nil
	}
	return
}

// checkRole check the current redis role.
func checkRole(addr string, role string) bool {
	if addr == "" {
		return false
	}
	// Step 3: call the ROLE command in the target instance
	conn, err := redis.DialTimeout("tcp", addr, sentinelTimeout, sentinelTimeout, sentinelTimeout)
	if err != nil {
		log.Error("redis.DialTimeout(\"tcp\", \"%s\", 500ms...) error(%v)", addr, err)
		return false
	}
	defer conn.Close()
	replies, err := redis.Values(conn.Do("ROLE"))
	if err != nil {
		log.Error("conn.Do(\"ROLE\") error(%v)", err)
		return false
	}
	if len(replies) < 1 {
		return false
	}
	curRole, err := redis.String(replies[0], nil)
	if err != nil {
		log.Error("redis.String(replies[0], nil) error(%v)", err)
		return false
	}
	log.Info("redis: \"%s\" role: \"%s\"", addr, curRole)
	if curRole == role {
		return true
	}
	return false
}

// watchNode watch a named node for leader selection when failover
func watchCometNode(conn *zk.Conn, node, fpath string, retry, ping time.Duration, ch chan *CometNodeEvent) {
	fpath = path.Join(fpath, node)
	for {
		nodes, watch, err := myzk.GetNodesW(conn, fpath)
		if err == myzk.ErrNodeNotExist {
			log.Warn("zk don't have node \"%s\"", fpath)
			break
		} else if err == myzk.ErrNoChild {
			log.Warn("zk don't have any children in \"%s\", retry in %d second", fpath, waitNodeDelay)
			time.Sleep(waitNodeDelaySecond)
			continue
		} else if err != nil {
			log.Error("zk path: \"%s\" getNodes error(%v), retry in %d second", fpath, err, waitNodeDelay)
			time.Sleep(waitNodeDelaySecond)
			continue
		}
		// leader selection
		sort.Strings(nodes)
		if info, err := registerCometNode(conn, nodes[0], fpath, retry, ping, true); err != nil {
			log.Error("zk path: \"%s\" registerCometNode error(%v)", fpath, err)
			time.Sleep(waitNodeDelaySecond)
			continue
		} else {
			// update node info
			ch <- &CometNodeEvent{Event: eventNodeUpdate, Key: node, Value: info}
		}
		// blocking receive event
		event := <-watch
		log.Info("zk path: \"%s\" receive a event: (%v)", fpath, event)
	}
	// WARN, if no persistence node and comet rpc not config
	log.Warn("zk path: \"%s\" never watch again till recreate", fpath)
}