+ handle_events(request, response) {
+ /* These headers will keep the connection open so we can stream events. */
+ const headers = {
+ "Content-type": "text/event-stream",
+ "Connection": "keep-alive",
+ "Cache-Control": "no-cache"
+ };
+ response.writeHead(200, headers);
+
+ /* Add this new client to our list of clients. */
+ const id = this.add_client(response);
+
+ /* And queue up cleanup to be triggered on client close. */
+ request.on('close', () => {
+ this.remove_client(id);
+ });
+
+ /* Finally, if this game class has a "state" property, stream that
+ * current state to the client. */
+ if (this.state) {
+ const state_json = JSON.stringify(this.state);
+ response.write(`event: game-state\ndata: ${state_json}\n\n`);
+ }
+ }
+
+ broadcast_move(move) {
+ this.broadcast_event("move", move);
+ }
+