server/sockets.js

   1 const url = require('url');
   2
   3 // Node version in Ubuntu 16.04 does not know about URL class
   4 function getJsonFromUrl(url)
   5 {
   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 // Removal in array of strings (socket IDs)
  16 function remInArray(arr, item)
  17 {
  18     const idx = arr.indexOf(item);
  19     if (idx >= 0)
  20         arr.splice(idx, 1);
  21 }
  22
  23 // TODO: empêcher multi-log du même user (envoyer le user ID + secret en même temps que name et...)
  24 // --> si secret ne matche pas celui trouvé en DB, stop
  25 // TODO: this file "in the end" would be much simpler, essentially just tracking connect/disconnect
  26 // (everything else using WebRTC)
  27 // TODO: lorsque challenge accepté, seul le dernier joueur à accepter envoi message "please start game"
  28 // avec les coordonnées des participants. Le serveur renvoit alors les détails de la partie (couleurs, position)
  29 //TODO: programmatic re-navigation on current game if we receive a move and are not there
  30
  31 module.exports = function(wss) {
  32     let clients = {}; //associative array client sid --> {socket, curPath}
  33     let pages = {}; //associative array path --> array of client sid
  34     // No-op function as a callback when sending messages
  35     const noop = () => { };
  36     wss.on("connection", (socket, req) => {
  37         const query = getJsonFromUrl(req.url);
  38         const sid = query["sid"];
  39         // Ignore duplicate connections (on the same live game that we play):
  40         if (!!clients[sid])
  41             return socket.send(JSON.stringify({code:"duplicate"}));
  42         // We don't know yet on which page the user will be
  43         clients[sid] = {socket: socket, path: ""};
  44
  45 //      socket.on("message", objtxt => {
  46 //          let obj = JSON.parse(objtxt);
  47 //          switch (obj.code)
  48 //          {
  49 //              case "enter":
  50 //                  if (clients[sid].path.length > 0)
  51 //                      remInArray(pages[clients[sid].path], sid);
  52 //                  clients[sid].path = obj.path;
  53 //                  pages[obj.path].push(sid);
  54 //                  // TODO also: notify "old" sub-room that I left (if it was not index)
  55 //                  if (obj.path == "/")
  56 //                  {
  57 //                      // Send counting info
  58 //                      let countings = {};
  59 //                      Object.keys(pages).forEach(
  60 //                          path => { countings[path] = pages[path].length; });
  61 //                      socket.send(JSON.stringify({code:"counts",counts:countings}));
  62 //                  }
  63 //                  else
  64 //                  {
  65 //                      // Send to every client connected on index an update message for counts
  66 //                      pages["/"].forEach((id) => {
  67 //                          clients[id].socket.send(
  68 //                              JSON.stringify({code:"increase",path:obj.path}), noop);
  69 //                      });
  70 //                      // TODO: do not notify anything in rules and problems sections (no socket required)
  71 //                      // --> in fact only /Atomic (main hall) and inside a game: /Atomic/392f3ju
  72 //                      // Also notify the (sub-)room (including potential opponents):
  73 //                      Object.keys(clients[page]).forEach( k => {
  74 //                          clients[page][k].send(JSON.stringify({code:"connect",id:sid}), noop);
  75 //                      });
  76 //                      // Finally, receive (sub-)room composition
  77 //                      // TODO.
  78 //                  }
  79 //// NOTE: no "leave" counterpart (because it's always to enter somewhere else)
  80 ////                case "leave":
  81 ////                    break;
  82 //              // Transmit chats and moves to current room
  83 //              // TODO: WebRTC instead in this case (most demanding?)
  84 //              case "newchat":
  85 //                  if (!!clients[page][obj.oppid])
  86 //                  {
  87 //                      clients[page][obj.oppid].send(
  88 //                          JSON.stringify({code:"newchat",msg:obj.msg}), noop);
  89 //                  }
  90 //                  break;
  91 //              case "newmove":
  92 //                  if (!!clients[page][obj.oppid])
  93 //                  {
  94 //                      clients[page][obj.oppid].send(
  95 //                          JSON.stringify({code:"newmove",move:obj.move}), noop);
  96 //                  }
  97 //                  break;
  98 //
  99 //
 100 //              // TODO: generalize that for several opponents
 101 //              case "ping":
 102 //                  if (!!clients[page][obj.oppid])
 103 //                      socket.send(JSON.stringify({code:"pong",gameId:obj.gameId}));
 104 //                  break;
 105 //              case "lastate":
 106 //                  if (!!clients[page][obj.oppid])
 107 //                  {
 108 //                      const oppId = obj.oppid;
 109 //                      obj.oppid = sid; //I'm oppid for my opponent
 110 //                      clients[page][oppId].send(JSON.stringify(obj), noop);
 111 //                  }
 112 //                  break;
 113 //              // TODO: moreover, here, game info should be sent (through challenge; not stored here)
 114 //              case "newgame":
 115 //                  if (!!games[page])
 116 //                  {
 117 //                      // Start a new game
 118 //                      const oppId = games[page]["id"];
 119 //                      const fen = games[page]["fen"];
 120 //                      const gameId = games[page]["gameid"];
 121 //                      delete games[page];
 122 //                      const mycolor = (Math.random() < 0.5 ? 'w' : 'b');
 123 //                      socket.send(JSON.stringify(
 124 //                          {code:"newgame",fen:fen,oppid:oppId,color:mycolor,gameid:gameId}));
 125 //                      if (!!clients[page][oppId])
 126 //                      {
 127 //                          clients[page][oppId].send(
 128 //                              JSON.stringify(
 129 //                                  {code:"newgame",fen:fen,oppid:sid,color:mycolor=="w"?"b":"w",gameid:gameId}),
 130 //                              noop);
 131 //                      }
 132 //                  }
 133 //                  else
 134 //                      games[page] = {id:sid, fen:obj.fen, gameid:obj.gameid}; //wait for opponent
 135 //                  break;
 136 //              case "cancelnewgame": //if a user cancel his seek
 137 //                  // TODO: just transmit event
 138 //                  //delete games[page];
 139 //                  break;
 140 //              // TODO: also other challenge events
 141 //              case "resign":
 142 //                  if (!!clients[page][obj.oppid])
 143 //                      clients[page][obj.oppid].send(JSON.stringify({code:"resign"}), noop);
 144 //                  break;
 145 //              // TODO: case "challenge" (get ID) --> send to all, "acceptchallenge" (with ID) --> send to all, "cancelchallenge" --> send to all
 146 //              // also, "sendgame" (give current game info, if any) --> to new connections, "sendchallenges" (same for challenges) --> to new connections
 147 //          }
 148 //      });
 149 //      socket.on("close", () => {
 150 //          delete clients[sid];
 151 //          // TODO: carefully delete pages[.........]
 152 //          // + adapt below:
 153 //          if (page != "/")
 154 //          {
 155 //              // Send to every client connected on index an update message for counts
 156 //              Object.keys(clients["index"]).forEach( k => {
 157 //                  clients["index"][k].send(
 158 //                      JSON.stringify({code:"decrease",vid:page}), noop);
 159 //              });
 160 //          }
 161 //          // Also notify potential opponents:
 162 //          // hit all clients which check if sid corresponds
 163 //          Object.keys(clients[page]).forEach( k => {
 164 //              clients[page][k].send(JSON.stringify({code:"disconnect",id:sid}), noop);
 165 //          });
 166 //      });
 167     });
 168 }