add a new websocket2 package without breaking changes to the iris API. It implements the gobwas/ws library (it works but need fixes on determinate closing connections) as suggested at: https://github.com/kataras/iris/issues/1178

Former-commit-id: be5ee623b7d030bd9e03a1a2f320ead975ef2ba8

websocket2/emitter.go

@@ -0,0 +1,43 @@
+package websocket
+
+const (
+	// All is the string which the Emitter use to send a message to all.
+	All = ""
+	// Broadcast is the string which the Emitter use to send a message to all except this connection.
+	Broadcast = ";to;all;except;me;"
+)
+
+type (
+	// Emitter is the message/or/event manager
+	Emitter interface {
+		// EmitMessage sends a native websocket message
+		EmitMessage([]byte) error
+		// Emit sends a message on a particular event
+		Emit(string, interface{}) error
+	}
+
+	emitter struct {
+		conn *connection
+		to   string
+	}
+)
+
+var _ Emitter = &emitter{}
+
+func newEmitter(c *connection, to string) *emitter {
+	return &emitter{conn: c, to: to}
+}
+
+func (e *emitter) EmitMessage(nativeMessage []byte) error {
+	e.conn.server.emitMessage(e.conn.id, e.to, nativeMessage)
+	return nil
+}
+
+func (e *emitter) Emit(event string, data interface{}) error {
+	message, err := e.conn.serializer.serialize(event, data)
+	if err != nil {
+		return err
+	}
+	e.EmitMessage(message)
+	return nil
+}