func NewMessageProcessor() MessageProcessor {
return MessageProcessor{
dbService: db.NewDbService(),
redisClient: client.GetNewRedisClient(),
}
}
func NewBaseController() *BaseController {
return &BaseController{db.NewDbService()}
}
func (p WsMessageReceiver) handleSubscribe(im interceptorMessage, msg *gowamp.Subscribe) {
opts := models.SubscribeOptions{}
err := models.Convert(msg.Options, &opts)
if err != nil {
log.Error(err)
return
}
topic := fmt.Sprintf("%v", msg.Topic)
topicArguments := strings.Split(topic, ".")
opts.Topic = topic
if opts.IsSpecial() {
baseTopic := messaging.BuildTopicArbitrary(topicArguments[:len(topicArguments)-1]...)
opts.BaseTopic = baseTopic
} else {
opts.BaseTopic = topic
}
log.Info("Listening for changefeed:", opts)
d := db.NewDbService()
newValuesChan := make(chan map[string]interface{})
//for create and delete we want to listen for changes for the whole collection, for update only for the specific item
if opts.Operation == messaging.OP_CREATE || opts.Operation == messaging.OP_DELETE {
err = d.Changes(opts.AppId, opts.Type, opts.Filter, newValuesChan)
} else if opts.Operation == messaging.OP_UPDATE {
opts.ItemId = topicArguments[len(topicArguments)-1]
err = d.ChangesId(opts.ItemId, newValuesChan)
}
if err != nil {
log.Error(err)
return
}
messageBuilder := messaging.GetMessageBuilder()
go func() {
leaveChan := make(chan interface{})
p.broadcaster.Subscribe(leaveChan)
for {
select {
case val := <-newValuesChan:
p.processDatabaseUpdate(val, &messageBuilder, opts)
case leaveVal := <-leaveChan:
sessionId := leaveVal.(gowamp.ID)
if im.sess.Id == sessionId {
//TODO: newValuesChan seems to be automatically closed by the rethinkdb driver
//investigate whether we need to do something else
_, leaveChanOpened := <-leaveChan
if leaveChanOpened {
close(leaveChan)
}
p.broadcaster.Remove(leaveChan)
return
}
}
}
}()
}