Sync async_nats work with master

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

gateway/vendor/github.com/alexellis/faas-nats/handler/handler.go

@@ -0,0 +1,48 @@
+package handler
+
+import (
+	"fmt"
+	"log"
+
+	"encoding/json"
+
+	"github.com/alexellis/faas/gateway/queue"
+	"github.com/nats-io/go-nats-streaming"
+)
+
+// NatsQueue queue for work
+type NatsQueue struct {
+	nc stan.Conn
+}
+
+// CreateNatsQueue ready for asynchronous processing
+func CreateNatsQueue(address string, port int) (*NatsQueue, error) {
+	queue1 := NatsQueue{}
+	var err error
+	natsURL := fmt.Sprintf("nats://%s:%d", address, port)
+	log.Printf("Opening connection to %s\n", natsURL)
+
+	clientID := "faas-publisher"
+	clusterID := "faas-cluster"
+
+	nc, err := stan.Connect(clusterID, clientID, stan.NatsURL(natsURL))
+	queue1.nc = nc
+
+	return &queue1, err
+}
+
+// Queue request for processing
+func (q *NatsQueue) Queue(req *queue.Request) error {
+	var err error
+
+	fmt.Printf("NatsQueue - submitting request: %s.\n", req.Function)
+
+	out, err := json.Marshal(req)
+	if err != nil {
+		log.Println(err)
+	}
+
+	err = q.nc.Publish("faas-request", out)
+
+	return err
+}