try-connecting.js

  tryConnecting(id) {
    // try to connect to a given room id. the first character is a code for
    // which server the opponent is connected to. in case of 2 servers, the
    // first half of the available characters is reserved for the first server,
    // the second half is reserved for the second server. this way we can still
    // have as many random combinations with 4 letters.
    this.isHost = false;
    return new Promise((resolve, reject) => {
      let serverIndex = -1;
      this.availablePrefixes.forEach((prefixes, index) => {
        if (prefixes.indexOf(id[0]) !== -1) {
          serverIndex = index;
        }
      });
      if (serverIndex === -1) {
        // impossible room code, there is no prefix like that
        reject('no room found');
      }
      this.connectToServer(this.availableServers[serverIndex]).then(() => {
        this.GAME_ID = id;
        this.isHost = false;
        this.setRecords();
        this.statusRecord.subscribe('room-is-open', value => {
          if (value) {
            this.startListening();
            this.statusRecord.set('player-2', {action: ACTION.CONNECT});
            this.isOpponentConnected = true;
            setTimeout(this.sendPings.bind(this), 1000);
            resolve();
          } else {
            reject('room already full');
          }
        });
        setTimeout(() => {
          reject('no room found');
        }, 2000);
      }).catch(e => {
        reject(e);
      });
    });
  }