Improvement attempt for connection indicator + Game robustness... fingers crossed
[vchess.git] / server / sockets.js
1 const url = require('url');
2
3 // Node version in Ubuntu 16.04 does not know about URL class
4 // NOTE: url is already transformed, without ?xxx=yyy... parts
5 function getJsonFromUrl(url) {
6 const query = url.substr(2); //starts with "/?"
7 let result = {};
8 query.split("&").forEach((part) => {
9 const item = part.split("=");
10 result[item[0]] = decodeURIComponent(item[1]);
11 });
12 return result;
13 }
14
15 // Helper to safe-send some message through a (web-)socket:
16 function send(socket, message) {
17 if (!!socket && socket.readyState == 1)
18 socket.send(JSON.stringify(message));
19 }
20
21 module.exports = function(wss) {
22 // Associative array page --> sid --> tmpId --> socket
23 // "page" is either "/" for hall or "/game/some_gid" for Game,
24 // or "/mygames" for Mygames page (simpler: no 'people' array).
25 // tmpId is required if a same user (browser) has different tabs
26 let clients = {};
27 let sidToPages = {};
28 let idToSid = {};
29 wss.on("connection", (socket, req) => {
30 const query = getJsonFromUrl(req.url);
31 const sid = query["sid"];
32 const id = query["id"];
33 const tmpId = query["tmpId"];
34 const page = query["page"];
35 const notifyRoom = (page, code, obj={}, except) => {
36 if (!clients[page]) return;
37 except = except || [];
38 Object.keys(clients[page]).forEach(k => {
39 if (except.includes(k)) return;
40 Object.keys(clients[page][k]).forEach(x => {
41 if (k == sid && x == tmpId) return;
42 send(
43 clients[page][k][x].socket,
44 Object.assign({ code: code, from: sid }, obj)
45 );
46 });
47 });
48 };
49 const deleteConnexion = () => {
50 if (!clients[page] || !clients[page][sid] || !clients[page][sid][tmpId])
51 return; //job already done
52 delete clients[page][sid][tmpId];
53 if (Object.keys(clients[page][sid]).length == 0) {
54 delete clients[page][sid];
55 const pgIndex = sidToPages[sid].findIndex(pg => pg == page);
56 sidToPages[sid].splice(pgIndex, 1);
57 if (Object.keys(clients[page]).length == 0)
58 delete clients[page];
59 // Am I totally offline?
60 if (sidToPages[sid].length == 0) {
61 delete sidToPages[sid];
62 delete idToSid[id];
63 }
64 }
65 };
66
67 const doDisconnect = () => {
68 deleteConnexion();
69 // Nothing to notify when disconnecting from MyGames page:
70 if (page != "/mygames" && (!clients[page] || !clients[page][sid])) {
71 // I effectively disconnected from this page:
72 notifyRoom(page, "disconnect");
73 if (page.indexOf("/game/") >= 0)
74 notifyRoom("/", "gdisconnect", { page:page });
75 }
76 };
77 const messageListener = (objtxt) => {
78 let obj = JSON.parse(objtxt);
79 switch (obj.code) {
80 // Wait for "connect" message to notify connection to the room,
81 // because if game loading is slow the message listener might
82 // not be ready too early.
83 case "connect": {
84 notifyRoom(page, "connect");
85 if (page.indexOf("/game/") >= 0)
86 notifyRoom("/", "gconnect", { page:page });
87 break;
88 }
89 case "disconnect":
90 // When page changes:
91 doDisconnect();
92 break;
93 case "killme": {
94 // Self multi-connect: manual removal + disconnect
95 const doKill = (pg) => {
96 Object.keys(clients[pg][obj.sid]).forEach(x => {
97 send(clients[pg][obj.sid][x].socket, { code: "killed" });
98 });
99 delete clients[pg][obj.sid];
100 };
101 const disconnectFromOtherConnexion = (pg,code,o={}) => {
102 Object.keys(clients[pg]).forEach(k => {
103 if (k != obj.sid) {
104 Object.keys(clients[pg][k]).forEach(x => {
105 send(
106 clients[pg][k][x].socket,
107 Object.assign({ code: code, from: obj.sid }, o)
108 );
109 });
110 }
111 });
112 };
113 Object.keys(clients).forEach(pg => {
114 if (clients[pg][obj.sid]) {
115 doKill(pg);
116 disconnectFromOtherConnexion(pg, "disconnect");
117 if (pg.indexOf("/game/") >= 0 && clients["/"])
118 disconnectFromOtherConnexion("/", "gdisconnect", { page: pg });
119 }
120 });
121 break;
122 }
123 case "pollclients": {
124 // From Hall or Game
125 let sockIds = [];
126 Object.keys(clients[page]).forEach(k => {
127 // Avoid polling myself: no new information to get
128 if (k != sid) sockIds.push(k);
129 });
130 send(socket, { code: "pollclients", sockIds: sockIds });
131 break;
132 }
133 case "pollclientsandgamers": {
134 // From Hall
135 let sockIds = [];
136 Object.keys(clients["/"]).forEach(k => {
137 // Avoid polling myself: no new information to get
138 if (k != sid) sockIds.push({sid:k});
139 });
140 // NOTE: a "gamer" could also just be an observer
141 Object.keys(clients).forEach(p => {
142 if (p.indexOf("/game/") >= 0) {
143 Object.keys(clients[p]).forEach(k => {
144 // 'page' indicator is needed for gamers
145 if (k != sid) sockIds.push({ sid:k, page:p });
146 });
147 }
148 });
149 send(socket, { code: "pollclientsandgamers", sockIds: sockIds });
150 break;
151 }
152
153 // Asking something: from is fully identified,
154 // but the requested resource can be from any tmpId (except current!)
155 case "askidentity":
156 case "asklastate":
157 case "askchallenges":
158 case "askgame": {
159 const pg = obj.page || page; //required for askidentity and askgame
160 if (!!clients[pg] && !!clients[pg][obj.target]) {
161 let tmpIds = Object.keys(clients[pg][obj.target]);
162 if (obj.target == sid) {
163 // Targetting myself
164 const idx_myTmpid = tmpIds.findIndex(x => x == tmpId);
165 if (idx_myTmpid >= 0) tmpIds.splice(idx_myTmpid, 1);
166 }
167 if (tmpIds.length > 0) {
168 const ttmpId = tmpIds[Math.floor(Math.random() * tmpIds.length)];
169 send(
170 clients[pg][obj.target][ttmpId].socket,
171 { code: obj.code, from: [sid,tmpId,page] }
172 );
173 }
174 }
175 break;
176 }
177
178 // Special situation of the previous "case":
179 // Full game can be asked to any observer.
180 case "askfullgame": {
181 if (!!clients[page]) {
182 let sids = Object.keys(clients[page]).filter(k => k != sid);
183 if (sids.length > 0) {
184 // Pick a SID at random in this set, and ask full game:
185 const rid = sids[Math.floor(Math.random() * sids.length)];
186 // ..to a random tmpId:
187 const tmpIds = Object.keys(clients[page][rid]);
188 const rtmpId = tmpIds[Math.floor(Math.random() * tmpIds.length)];
189 send(
190 clients[page][rid][rtmpId].socket,
191 { code: "askfullgame", from: [sid,tmpId] }
192 );
193 }
194 }
195 break;
196 }
197
198 // Some Hall events: target all tmpId's (except mine),
199 case "refusechallenge":
200 case "startgame":
201 Object.keys(clients[page][obj.target]).forEach(x => {
202 if (obj.target != sid || x != tmpId)
203 send(
204 clients[page][obj.target][x].socket,
205 { code: obj.code, data: obj.data }
206 );
207 });
208 break;
209
210 // Notify all room: mostly game events
211 case "newchat":
212 case "newchallenge":
213 case "deletechallenge_s":
214 case "newgame":
215 case "resign":
216 case "abort":
217 case "drawoffer":
218 case "rematchoffer":
219 case "draw":
220 notifyRoom(page, obj.code, {data: obj.data}, obj.excluded);
221 break;
222
223 case "rnewgame":
224 // A rematch game started:
225 notifyRoom(page, "newgame", {data: obj.data});
226 // Explicitely notify Hall if gametype == corr.
227 // Live games will be polled from Hall after gconnect event.
228 if (obj.data.cadence.indexOf('d') >= 0)
229 notifyRoom("/", "newgame", {data: obj.data});
230 break;
231
232 case "newmove": {
233 const dataWithFrom = { from: [sid,tmpId], data: obj.data };
234 // Special case re-send newmove only to opponent:
235 if (!!obj.target && !!clients[page][obj.target]) {
236 Object.keys(clients[page][obj.target]).forEach(x => {
237 send(
238 clients[page][obj.target][x].socket,
239 Object.assign({ code: "newmove" }, dataWithFrom)
240 );
241 });
242 } else {
243 // NOTE: data.from is useful only to opponent
244 notifyRoom(page, "newmove", dataWithFrom);
245 }
246 break;
247 }
248 case "gotmove":
249 if (
250 !!clients[page][obj.target[0]] &&
251 !!clients[page][obj.target[0]][obj.target[1]]
252 ) {
253 send(
254 clients[page][obj.target[0]][obj.target[1]].socket,
255 { code: "gotmove" }
256 );
257 }
258 break;
259
260 case "result":
261 // Special case: notify all, 'transroom': Game --> Hall
262 notifyRoom("/", "result", { gid: obj.gid, score: obj.score });
263 break;
264
265 case "mabort": {
266 const gamePg = "/game/" + obj.gid;
267 if (!!clients[gamePg] && !!clients[gamePg][obj.target]) {
268 Object.keys(clients[gamePg][obj.target]).forEach(x => {
269 send(
270 clients[gamePg][obj.target][x].socket,
271 { code: "abort" }
272 );
273 });
274 }
275 break;
276 }
277
278 case "notifyscore":
279 case "notifyturn":
280 case "notifynewgame":
281 if (!!clients["/mygames"]) {
282 obj.targets.forEach(t => {
283 const k = t.sid || idToSid[t.id];
284 if (!!clients["/mygames"][k]) {
285 Object.keys(clients["/mygames"][k]).forEach(x => {
286 send(
287 clients["/mygames"][k][x].socket,
288 { code: obj.code, data: obj.data }
289 );
290 });
291 }
292 });
293 }
294 break;
295
296 case "getfocus":
297 case "losefocus":
298 if (page == "/") notifyRoom("/", obj.code, { page: "/" }, [sid]);
299 else {
300 // Notify game room + Hall:
301 notifyRoom(page, obj.code, {}, [sid]);
302 notifyRoom("/", obj.code, { page: page }, [sid]);
303 }
304 break;
305
306 // Passing, relaying something: from isn't needed,
307 // but target is fully identified (sid + tmpId)
308 case "challenges":
309 case "fullgame":
310 case "game":
311 case "identity":
312 case "lastate":
313 {
314 const pg = obj.target[2] || page; //required for identity and game
315 // NOTE: if in game we ask identity to opponent still in Hall,
316 // but leaving Hall, clients[pg] or clients[pg][target] could be undefined
317 if (!!clients[pg] && !!clients[pg][obj.target[0]]) {
318 send(
319 clients[pg][obj.target[0]][obj.target[1]].socket,
320 { code:obj.code, data:obj.data }
321 );
322 }
323 break;
324 }
325 }
326 };
327 const closeListener = () => {
328 // For browser or tab closing (including page reload):
329 doDisconnect();
330 };
331 // Update clients object: add new connexion
332 const newElt = { socket: socket, focus: true };
333 if (!clients[page])
334 clients[page] = { [sid]: {[tmpId]: newElt } };
335 else if (!clients[page][sid])
336 clients[page][sid] = { [tmpId]: newElt };
337 else
338 clients[page][sid][tmpId] = newElt;
339 // Also update helper correspondances
340 if (!idToSid[id]) idToSid[id] = sid;
341 if (!sidToPages[sid]) sidToPages[sid] = [];
342 const pgIndex = sidToPages[sid].findIndex(pg => pg == page);
343 if (pgIndex === -1) sidToPages[sid].push(page);
344 socket.on("message", messageListener);
345 socket.on("close", closeListener);
346 });
347 }