chore(queue): support NSQ as backend. (#600)

queue/nsq/nsq.go

@@ -0,0 +1,145 @@
+package nsq
+
+import (
+	"encoding/json"
+	"errors"
+	"sync"
+	"time"
+
+	"github.com/appleboy/gorush/gorush"
+	"github.com/appleboy/gorush/queue"
+
+	"github.com/nsqio/go-nsq"
+)
+
+var _ queue.Worker = (*Worker)(nil)
+
+// Option for queue system
+type Option func(*Worker)
+
+// Worker for NSQ
+type Worker struct {
+	q       *nsq.Consumer
+	p       *nsq.Producer
+	once    sync.Once
+	addr    string
+	topic   string
+	channel string
+}
+
+// WithAddr setup the addr of NSQ
+func WithAddr(addr string) Option {
+	return func(w *Worker) {
+		w.addr = addr
+	}
+}
+
+// WithTopic setup the topic of NSQ
+func WithTopic(topic string) Option {
+	return func(w *Worker) {
+		w.topic = topic
+	}
+}
+
+// WithChannel setup the channel of NSQ
+func WithChannel(channel string) Option {
+	return func(w *Worker) {
+		w.channel = channel
+	}
+}
+
+// NewWorker for struc
+func NewWorker(opts ...Option) *Worker {
+	w := &Worker{
+		addr:    "127.0.0.1:4150",
+		topic:   "gorush",
+		channel: "ch",
+	}
+
+	// Loop through each option
+	for _, opt := range opts {
+		// Call the option giving the instantiated
+		opt(w)
+	}
+
+	cfg := nsq.NewConfig()
+	q, err := nsq.NewConsumer(w.topic, w.channel, cfg)
+	if err != nil {
+		panic(err)
+	}
+	w.q = q
+
+	p, err := nsq.NewProducer(w.addr, cfg)
+	if err != nil {
+		panic(err)
+	}
+	w.p = p
+
+	return w
+}
+
+// BeforeRun run script before start worker
+func (s *Worker) BeforeRun() error {
+	return nil
+}
+
+// AfterRun run script after start worker
+func (s *Worker) AfterRun() error {
+	s.once.Do(func() {
+		time.Sleep(100 * time.Millisecond)
+		err := s.q.ConnectToNSQLookupd(s.addr)
+		if err != nil {
+			panic("Could not connect nsq server: " + err.Error())
+		}
+	})
+
+	return nil
+}
+
+// Run start the worker
+func (s *Worker) Run(quit chan struct{}) error {
+	s.q.AddHandler(nsq.HandlerFunc(func(msg *nsq.Message) error {
+		var notification gorush.PushNotification
+		if err := json.Unmarshal(msg.Body, &notification); err != nil {
+			return err
+		}
+		gorush.SendNotification(notification)
+		return nil
+	}))
+
+	select {
+	case <-quit:
+	}
+	return nil
+}
+
+// Shutdown worker
+func (s *Worker) Shutdown() error {
+	s.q.Stop()
+	s.p.Stop()
+	return nil
+}
+
+// Capacity for channel
+func (s *Worker) Capacity() int {
+	return 0
+}
+
+// Usage for count of channel usage
+func (s *Worker) Usage() int {
+	return 0
+}
+
+// Queue send notification to queue
+func (s *Worker) Queue(job interface{}) error {
+	v, ok := job.(gorush.PushNotification)
+	if !ok {
+		return errors.New("wrong type of job")
+	}
+	err := s.p.Publish(s.topic, v.Bytes())
+	if err != nil {
+		return err
+	}
+
+	return nil
+}