added Publish function

Author: dstpierre

cache.go

@@ -71,3 +71,24 @@ func QueueWork(token, key, value string) error {
 	var ok bool
 	return Post(token, "/sudo/cache", data, &ok)
 }
+
+// Publish sends a message to a channel (topic) where usually a server-side
+// function will process the message.
+func Publish(token, channel, typ string, data interface{}) error {
+	b, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+
+	payload := new(struct {
+		Channel string `json:"channel"`
+		Type    string `json:"type"`
+		Data    string `json:"data"`
+	})
+	payload.Channel = channel
+	payload.Type = typ
+	payload.Data = string(b)
+
+	var status bool
+	return Post(token, "/publish", payload, &status)
+}

cache_test.go

@@ -0,0 +1,18 @@
+package backend_test
+
+import (
+	"testing"
+
+	"github.com/staticbackendhq/backend-go"
+)
+
+func TestPublishMessage(t *testing.T) {
+	fakeTask := Task{
+		Name: "not real",
+		Done: true,
+	}
+
+	if err := backend.Publish(token, "test-channel", "test-type", fakeTask); err != nil {
+		t.Fatal(err)
+	}
+}