X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=server.js;h=7ea999aa71372a6be41c927e24cd4542b5a6eb9d;hb=1e652af1e541675c021201743bfe1873f591944e;hp=4957f321f1f64628fcffa0800401a296e4e08504;hpb=c9c80e294186a8b2ef742806559a0655d624c05f;p=lmno-server

diff --git a/server.js b/server.js
index 4957f32..7ea999a 100644
--- a/server.js
+++ b/server.js
@@ -1,40 +1,188 @@
-const express = require("express")
+const express = require("express");
+const cors = require("cors");
 const body_parser = require("body-parser");
 
 const app = express();
+app.use(cors());
 
 class Game {
   constructor() {
-    this.players = [];
+    this._players = [];
     this.next_player_id = 1;
+    this.clients = [];
+    this.next_client_id = 1;
+
+    /* Send a comment to every connected client every 15 seconds. */
+    setInterval(() => {this.broadcast_string(":");}, 15000);
   }
 
   add_player(name, character) {
-    this.players.push({id: this.next_player_id,
+    const new_player = {id: this.next_player_id,
                        name: name,
-                       character: character})
+                       character: character,
+                       captures: [],
+                       };
+    this._players.push(new_player);
     this.next_player_id++;
+    /* The syntax here is using an anonymous function to create a new
+      object from new_player with just the subset of fields that we
+      want. */
+    const player_string = JSON.stringify((({id, name}) => ({id, name}))(new_player));
+    this.broadcast_event("player-register", player_string);
+  }
+
+  remove_player(id) {
+    const index = this._players.findIndex(player => player.id === id);
+    this._players.splice(index, 1);
+
+    this.broadcast_event("player-deregister", `{"id": ${id}}`);
+  }
+
+  remove_all_players() {
+    this._players = [];
+    this.next_player_id = 1;
+  }
+
+  capture(captor_id, captee_id) {
+    /* TODO: Fix to fail on already-captured players (or to move the
+     * captured player from an old captor to a new—need to clarify in
+     * the API specification which we want here. */
+    let captor = this._players.find(player => player.id === captor_id);
+    captor.captures.push(captee_id);
+
+    this.broadcast_event("capture", `{"captor": ${captor_id}, "captee": ${captee_id}}`);
+  }
+
+  liberate(captee_id) {
+    let captor = this._players.find(player => player.captures.includes(captee_id));
+    captor.captures.splice(captor.captures.indexOf(captee_id), 1);
+  }
+
+  restart() {
+    for (const player of this._players) {
+      player.captures = [];
+    }
+  }
+
+  get characters() {
+    return this._players.map(player => player.character);
+  }
+
+  get empires() {
+    return this._players.map(player => ({id: player.id, captures: player.captures}));
+  }
+
+  get players() {
+    return this._players.map(player => ({id: player.id, name: player.name }));
+  }
+
+  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'));
+  }
+
+  /* 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`);
   }
 }
 
-game = new Game();
+const game = new Game();
 
 app.use(body_parser.urlencoded({ extended: false }));
 app.use(body_parser.json());
 
-app.get('/', function (requses, response) {
+function 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);
+
+  /* Now that a client has connected, first we need to stream all of
+   * the existing players (if any). */
+  if (game._players.length > 0) {
+    const players_json = JSON.stringify(game.players);
+    const players_data = `event: players\ndata: ${players_json}\n\n`;
+    response.write(players_data);
+  }
+
+  /* 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);
+  });
+}
+
+app.get('/', (request, response) => {
   response.send('Hello World!');
 });
 
-app.get('/players', function (request, response) {
-  response.send(game.players);
+app.post('/register', (request, response) => {
+  game.add_player(request.body.name, request.body.character);
+  response.send();
 });
 
-app.post('/register', function (request, response) {
-  game.add_player(request.body.name, request.body.character);
+app.post('/deregister/:id', (request, response) => {
+  game.remove_player(parseInt(request.params.id));
   response.send();
 });
 
+app.post('/reset', (request, response) => {
+  game.remove_all_players();
+  response.send();
+});
+
+app.post('/capture/:captor/:captee', (request, response) => {
+  game.capture(parseInt(request.params.captor), parseInt(request.params.captee));
+  response.send();
+});
+
+app.post('/liberate/:id', (request, response) => {
+  game.liberate(parseInt(request.params.id));
+  response.send();
+});
+
+app.post('/restart', (request, response) => {
+  game.restart(parseInt(request.params.id));
+    response.send();
+});
+
+app.get('/characters', (request, response) => {
+  response.send(game.characters);
+});
+
+app.get('/empires', (request, response) => {
+  response.send(game.empires);
+});
+
+app.get('/players', (request, response) => {
+  response.send(game.players);
+});
+
+app.get('/events', handle_events);
+
 app.listen(3000, function () {
-  console.log('Example app listening on port 3000!');
+  console.log('Empires server listening on localhost:3000');
 });