All files / realtime TransportManager.ts

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/**
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
import { BrowserPollConnection } from './BrowserPollConnection';
import { WebSocketConnection } from './WebSocketConnection';
import { warn, each } from '../core/util/util';
import { TransportConstructor } from './Transport';
import { RepoInfo } from '../core/RepoInfo';
 
/**
 * Currently simplistic, this class manages what transport a Connection should use at various stages of its
 * lifecycle.
 *
 * It starts with longpolling in a browser, and httppolling on node. It then upgrades to websockets if
 * they are available.
 * @constructor
 */
export class TransportManager {
  private transports_: TransportConstructor[];
 
  /**
   * @const
   * @type {!Array.<function(new:Transport, string, RepoInfo, string=)>}
   */
  static get ALL_TRANSPORTS() {
    return [BrowserPollConnection, WebSocketConnection];
  }
 
  /**
   * @param {!RepoInfo} repoInfo Metadata around the namespace we're connecting to
   */
  constructor(repoInfo: RepoInfo) {
    this.initTransports_(repoInfo);
  }
 
  /**
   * @param {!RepoInfo} repoInfo
   * @private
   */
  private initTransports_(repoInfo: RepoInfo) {
    const isWebSocketsAvailable: boolean =
      WebSocketConnection && WebSocketConnection['isAvailable']();
    let isSkipPollConnection =
      isWebSocketsAvailable && !WebSocketConnection.previouslyFailed();
 
    Iif (repoInfo.webSocketOnly) {
      if (!isWebSocketsAvailable)
        warn(
          "wss:// URL used, but browser isn't known to support websockets.  Trying anyway."
        );
 
      isSkipPollConnection = true;
    }
 
    if (isSkipPollConnection) {
      this.transports_ = [WebSocketConnection];
    } else {
      const transports = (this.transports_ = [] as TransportConstructor[]);
      each(
        TransportManager.ALL_TRANSPORTS,
        (i: number, transport: TransportConstructor) => {
          Eif (transport && transport['isAvailable']()) {
            transports.push(transport);
          }
        }
      );
    }
  }
 
  /**
   * @return {function(new:Transport, !string, !RepoInfo, string=, string=)} The constructor for the
   * initial transport to use
   */
  initialTransport(): TransportConstructor {
    Eif (this.transports_.length > 0) {
      return this.transports_[0];
    } else {
      throw new Error('No transports available');
    }
  }
 
  /**
   * @return {?function(new:Transport, function(),function(), string=)} The constructor for the next
   * transport, or null
   */
  upgradeTransport(): TransportConstructor | null {
    if (this.transports_.length > 1) {
      return this.transports_[1];
    } else {
      return null;
    }
  }
}