const express = require("express");
-const cors = require("cors");
-const body_parser = require("body-parser");
-const path = require("path");
-const nunjucks = require("nunjucks");
-
-const app = express();
-app.use(cors());
-app.use(body_parser.urlencoded({ extended: false }));
-app.use(body_parser.json());
-
-nunjucks.configure("templates", {
- autoescape: true,
- express: app
-});
+const Game = require("./game.js");
+
+const engine_name = "tictactoe";
-class TicTacToe {
+const router = express.Router();
+
+class TicTacToe extends Game {
constructor() {
+ super(engine_name);
this.moves = [];
this.board = Array(9).fill(null);
- this.clients = [];
- this.next_client_id = 1;
}
/* Returns Boolean indicating whether move was legal and added. */
return true;
}
- add_client(response) {
- const id = this.next_client_id;
- this.clients.push({id: id,
- response: response});
- this.next_client_id++;
-
- return id;
- }
-
- remove_client(id) {
- this.clients = this.clients.filter(client => client.id !== id);
- }
-
- /* Send a string to all clients */
- broadcast_string(str) {
- this.clients.forEach(client => client.response.write(str + '\n'));
+ broadcast_move(square) {
+ this.broadcast_event("move", square);
}
- /* Send an event to all clients.
- *
- * An event has both a declared type and a separate data block.
- * It also ends with two newlines (to mark the end of the event).
- */
- broadcast_event(type, data) {
- this.broadcast_string(`event: ${type}\ndata: ${data}\n`);
- }
+ handle_events(request, response) {
+ super.handle_events(request, response);
- broadcast_move(square) {
- this.broadcast_event("move", square);
+ /* When a new client joins, replay all previous moves to it. */
+ for (let move of this.moves) {
+ response.write(`event: move\ndata: ${move}\n\n`);
+ }
}
}
-app.get('/', (request, response) => {
+router.get('/', (request, response) => {
const game = request.game;
if (! request.session.nickname)
response.render('tictactoe-game.html');
});
-app.post('/move', (request, response) => {
+router.post('/move', (request, response) => {
const game = request.game;
const square = request.body.square;
game.broadcast_move(square);
});
-app.get('/events', (request, response) => {
+router.get('/events', (request, response) => {
const game = request.game;
- /* 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 = game.add_client(response);
-
- /* And queue up cleanup to be triggered on client close. */
- request.on('close', () => {
- game.remove_client(id);
- });
+ game.handle_events(request, response);
});
-exports.app = app;
-exports.name = "tictactoe";
+exports.router = router;
+exports.name = engine_name;
exports.Game = TicTacToe;