Support keepalive PING messages on the socket

message.go

@@ -1,12 +1,25 @@
 package main
 
-type Message struct {
-	Author string `json:"author"`
-	Body   string `json:"body"`
-	Image  string `json:"image"`
-	Id     string `json:"id"`
+type ChatMessage struct {
+	Author      string `json:"author"`
+	Body        string `json:"body"`
+	Image       string `json:"image"`
+	ID          string `json:"id"`
+	MessageType string `json:"type"`
 }
 
-func (self *Message) String() string {
-	return self.Author + " says " + self.Body
+func (s *ChatMessage) AsJson() string {
+	return s.Author + " says " + s.Body
+}
+
+func (s *ChatMessage) String() string {
+	return s.Author + " says " + s.Body
+}
+
+type PingMessage struct {
+	MessageType string `json:"type"`
+}
+
+func (self *PingMessage) AsJson() string {
+	return "{type: \"PING\"}"
 }