Add pub/sub to client/server and make broker more low level

client/rpc_publication.go

@@ -0,0 +1,27 @@
+package client
+
+type rpcPublication struct {
+	topic       string
+	contentType string
+	message     interface{}
+}
+
+func newRpcPublication(topic string, message interface{}, contentType string) Publication {
+	return &rpcPublication{
+		message:     message,
+		topic:       topic,
+		contentType: contentType,
+	}
+}
+
+func (r *rpcPublication) ContentType() string {
+	return r.contentType
+}
+
+func (r *rpcPublication) Topic() string {
+	return r.topic
+}
+
+func (r *rpcPublication) Message() interface{} {
+	return r.message
+}