// Publish serializes and writes the given task to the
// shared task topic and creates the unique topic and channel
// on which the task's results will be published.
func (self *Taskd) Publish(t *task.Task) (err error) {
taskBody, err := task.Encode(t)
if err != nil {
return
}
frameType, _, err := self.writer.Publish(self.options.MsgTopic, taskBody)
if err != nil || frameType == nsq.FrameTypeError {
return
}
err = msg.CreateTopicChannel(t.ResponseTopic, t.ResponseChan, self.options.MsgSinkHttpAddr)
return
}
// Start configures the NSQWriter and checks if the tasks topic exists.
// The topic is created if it does not exist.
func (self *Taskd) Start(wg *sync.WaitGroup) (err error) {
self.writer = nsq.NewWriter(self.options.MsgSinkTcpAddr)
topicExists, err := msg.TopicExists(self.options.MsgTopic, []string{self.options.MsgSourceHttpAddr})
if err != nil {
log.Fatalf("Could not query topic existance: %s", err)
}
if !topicExists {
err = msg.CreateTopicChannel(self.options.MsgTopic, self.options.MsgChannel, self.options.MsgSourceHttpAddr)
if err != nil {
log.Fatalf("Creating topic failed: %s", err)
}
}
self.wg = wg
self.wg.Add(1)
return
}