// 判断消息是否已读
func (this *service) handlePendingMessage(msg *message.PublishMessage, pending_status *PendingStatus) {
// 如果QOS=0,则无需等待直接返回
if string(msg.Topic()) == OnlineStatusChannel {
return
}
// 将msg按照pkt_id，存入pending队列
pkt_id := msg.PacketId()
// pending_msg := NewPendingMessage(msg)
select {
case <-pending_status.Done:
// 消息已成功接收，不再等待
case <-time.After(time.Second * MsgPendingTime):
// 重试一次
Log.Debugc(func() string {
return fmt.Sprintf("(%s) receive ack %d timeout. try to resend. topic: %s", this.cid(), msg.PacketId(), msg.Topic())
})
this.retryPublish(msg)
select {
case <-pending_status.Done:
// 重发的消息已成功接收，不再等待
case <-time.After(time.Second * MsgPendingTime):
// 没有回ack，放到离线队列里
Log.Debugc(func() string {
return fmt.Sprintf("(%s) receive ack %d timeout. send msg to offline msg queue.topic: %s", this.cid(), msg.PacketId(), msg.Topic())
// return fmt.Sprintf("(%s) receive ack timeout. send msg to offline msg queue.topic: %s, payload: %s", this.cid(), msg.Topic(),msg.Payload())
})
OfflineTopicQueueProcessor <- msg
}
}
PendingQueue[pkt_id] = nil
}
// For PUBLISH message, we should figure out what QoS it is and process accordingly
// If QoS == 0, we should just take the next step, no ack required
// If QoS == 1, we should send back PUBACK, then take the next step
// If QoS == 2, we need to put it in the ack queue, send back PUBREC
func (this *service) processPublish(msg *message.PublishMessage) error {
switch msg.QoS() {
case message.QosExactlyOnce:
this.sess.Pub2in.Wait(msg, nil)
resp := message.NewPubrecMessage()
resp.SetPacketId(msg.PacketId())
_, err := this.writeMessage(resp)
err = this.preDispatchPublish(msg)
return err
case message.QosAtLeastOnce:
resp := message.NewPubackMessage()
resp.SetPacketId(msg.PacketId())
if _, err := this.writeMessage(resp); err != nil {
return err
}
err := this.preDispatchPublish(msg)
return err
case message.QosAtMostOnce:
err := this.preDispatchPublish(msg)
return err
default:
fmt.Printf("default: %d\n", msg.QoS())
}
return fmt.Errorf("(%s) invalid message QoS %d.", this.cid(), msg.QoS())
}
// processPublish() is called when the server receives a PUBLISH message AND have completed
// the ack cycle. This method will get the list of subscribers based on the publish
// topic, and publishes the message to the list of subscribers.
func (this *service) postPublish(msg *message.PublishMessage) (err error) {
// if msg.Retain() {
// if err = this.topicsMgr.Retain(msg); err != nil {
// Log.Errorc(func() string{ return fmt.Sprintf("(%s) Error retaining message: %v", this.cid(), err)})
// }
// }
// var subs []interface{}
topic := string(msg.Topic())
if !IsOnline(topic) {
Log.Debugc(func() string {
return fmt.Sprintf("(%s) this client is offline, send %d to offline queue.", this.cid(), msg.PacketId())
})
OfflineTopicQueueProcessor <- msg
return nil
}
subs := _get_temp_subs()
defer _return_temp_subs(subs)
err = this.topicsMgr.Subscribers(msg.Topic(), msg.QoS(), &subs, nil)
if err != nil {
Log.Errorc(func() string {
return fmt.Sprintf("(%s) Error retrieving subscribers list: %v", this.cid(), err)
})
return err
}
// Log.Errorc(func() string{ return fmt.Sprintf("(%s) Publishing to topic %q and %d subscribers", this.cid(), string(msg.Topic()), len(this.subs))})
// fmt.Printf("value: %v\n", config.GetModel())
// done := make(chan bool)
pending_status := NewPendingStatus(topic, msg)
pkt_id := msg.PacketId()
PendingQueue[pkt_id] = pending_status
go this.handlePendingMessage(msg, pending_status)
for _, s := range subs {
if s != nil {
fn, ok := s.(*OnPublishFunc)
if !ok {
Log.Errorc(func() string {
return fmt.Sprintf("Invalid onPublish Function: %T", s)
})
return fmt.Errorf("Invalid onPublish Function")
} else {
(*fn)(msg)
// Log.Errorc(func() string{ return fmt.Sprintf("OfflineTopicQueue[%s]: %v, len is: %d\n", msg.Topic(), OfflineTopicQueue[string(msg.Topic())], len(OfflineTopicQueue[string(msg.Topic())]))})
}
}
}
return nil
}
func (this *service) retryPublish(msg *message.PublishMessage) (err error) {
// if msg.Retain() {
// if err = this.topicsMgr.Retain(msg); err != nil {
// Log.Errorc(func() string{ return fmt.Sprintf("(%s) Error retaining message: %v", this.cid(), err)})
// }
// }
// var subs []interface{}
topic := string(msg.Topic())
subs := _get_temp_subs()
defer _return_temp_subs(subs)
err = this.topicsMgr.Subscribers(msg.Topic(), msg.QoS(), &subs, nil)
if err != nil {
Log.Errorc(func() string {
return fmt.Sprintf("(%s) Error retrieving subscribers list: %v", this.cid(), err)
})
return err
}
pending_status := NewPendingStatus(topic, msg)
pkt_id := msg.PacketId()
PendingQueue[pkt_id] = pending_status
for _, s := range subs {
if s != nil {
fn, ok := s.(*OnPublishFunc)
if !ok {
Log.Errorc(func() string {
return fmt.Sprintf("Invalid onPublish Function: %T", s)
})
return fmt.Errorf("Invalid onPublish Function")
} else {
(*fn)(msg)
}
}
}
return nil
}
// 预投递publish类型的消息，如果是特殊频道特殊处理，否则正常处理
func (this *service) preDispatchPublish(msg *message.PublishMessage) (err error) {
switch string(msg.Topic()) {
case BroadCastChannel:
go OnGroupPublish(msg, this)
case SendChannel:
go this.onReceiveBadge(msg)
case ApnPushChannel:
go onAPNsPush(msg, this)
case ApnInvalidTokensChannel:
go getInvalidApnTokens(this)
case OnlineStatusChannel:
go this.checkOnlineStatus(msg)
default:
msg.SetPacketId(getNextPktId())
Log.Infoc(func() string {
return fmt.Sprintf("(%s) process private message.pkt_id: %d, payload size: %d", this.cid(), msg.PacketId(), len(msg.Payload()))
})
go this.postPublish(msg)
}
return
}