add ipfs pubsub methods

data/data.go

@@ -8,7 +8,7 @@ import (
 	shell "github.com/ipfs/go-ipfs-api"
 )
 
-func publish(object []byte) (string) {
+func publish(object []byte) string {
 	sh := shell.NewShell("localhost:5001")
 	cid, err := sh.Add(bytes.NewBuffer(object))
 	if err != nil {
@@ -28,7 +28,7 @@ func pin(path string) {
 }
 
 
-func retrieve(hash string) ([]byte){
+func retrieve(hash string) []byte {
 	sh := shell.NewShell("localhost:5001")
 	reader, err := sh.Cat(hash)
 	if err != nil {
@@ -42,3 +42,22 @@ func retrieve(hash string) ([]byte){
 	}
 	return content
 }
+
+func PsSubscribe(topic string) *shell.PubSubSubscription {
+	sh := shell.NewShell("localhost:5001")
+	sub, err := sh.PubSubSubscribe(topic)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %s", err)
+		os.Exit(1)
+	}
+	return sub
+}
+
+func PsPublish(topic, data string) {
+	sh := shell.NewShell("localhost:5001")
+	err := sh.PubSubPublish(topic, data)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %s", err)
+		os.Exit(1)
+	}
+}