The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/toolkit/components/social/MessagePortBase.jsm	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,108 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +
     1.8 +// Code that is shared between clients and workers.
     1.9 +this.EXPORTED_SYMBOLS = ["AbstractPort"];
    1.10 +
    1.11 +this.AbstractPort = function AbstractPort(portid) {
    1.12 +  this._portid = portid;
    1.13 +  this._handler = undefined;
    1.14 +  this._closed = false;
    1.15 +  // pending messages sent to this port before it has a message handler.
    1.16 +  this._pendingMessagesIncoming = [];
    1.17 +};
    1.18 +
    1.19 +AbstractPort.prototype = {
    1.20 +  _portType: null, // set by a subclass.
    1.21 +  // abstract methods to be overridden.
    1.22 +  _dopost: function fw_AbstractPort_dopost(data) {
    1.23 +    throw new Error("not implemented");
    1.24 +  },
    1.25 +  _onerror: function fw_AbstractPort_onerror(err) {
    1.26 +    throw new Error("not implemented");
    1.27 +  },
    1.28 +
    1.29 +  // and concrete methods shared by client and workers.
    1.30 +  toString: function fw_AbstractPort_toString() {
    1.31 +    return "MessagePort(portType='" + this._portType + "', portId="
    1.32 +           + this._portid + (this._closed ? ", closed=true" : "") + ")";
    1.33 +  },
    1.34 +  _JSONParse: function fw_AbstractPort_JSONParse(data) JSON.parse(data),
    1.35 +
    1.36 + _postControlMessage: function fw_AbstractPort_postControlMessage(topic, data) {
    1.37 +    let postData = {
    1.38 +      portTopic: topic,
    1.39 +      portId: this._portid,
    1.40 +      portFromType: this._portType,
    1.41 +      data: data
    1.42 +    };
    1.43 +    this._dopost(postData);
    1.44 +  },
    1.45 +
    1.46 +  _onmessage: function fw_AbstractPort_onmessage(data) {
    1.47 +    // See comments in postMessage below - we work around a cloning
    1.48 +    // issue by using JSON for these messages.
    1.49 +    // Further, we allow the workers to override exactly how the JSON parsing
    1.50 +    // is done - we try and do such parsing in the client window so things
    1.51 +    // like prototype overrides on Array work as expected.
    1.52 +    if (!this._handler) {
    1.53 +      this._pendingMessagesIncoming.push(data);
    1.54 +    } else {
    1.55 +      data = this._JSONParse(data);
    1.56 +      try {
    1.57 +        this._handler({
    1.58 +          data: data,
    1.59 +          __exposedProps__: {
    1.60 +            data: 'r'
    1.61 +          }
    1.62 +        });
    1.63 +      } catch (ex) {
    1.64 +        this._onerror(ex);
    1.65 +      }
    1.66 +    }
    1.67 +  },
    1.68 +
    1.69 +  set onmessage(handler) { // property setter for onmessage
    1.70 +    this._handler = handler;
    1.71 +    while (this._pendingMessagesIncoming.length) {
    1.72 +      this._onmessage(this._pendingMessagesIncoming.shift());
    1.73 +    }
    1.74 +  },
    1.75 +  get onmessage() {
    1.76 +    return this._handler;
    1.77 +  },
    1.78 +
    1.79 +  /**
    1.80 +   * postMessage
    1.81 +   *
    1.82 +   * Send data to the onmessage handler on the other end of the port.  The
    1.83 +   * data object should have a topic property.
    1.84 +   *
    1.85 +   * @param {jsobj} data
    1.86 +   */
    1.87 +  postMessage: function fw_AbstractPort_postMessage(data) {
    1.88 +    if (this._closed) {
    1.89 +      throw new Error("port is closed");
    1.90 +    }
    1.91 +    // There seems to be an issue with passing objects directly and letting
    1.92 +    // the structured clone thing work - we sometimes get:
    1.93 +    // [Exception... "The object could not be cloned."  code: "25" nsresult: "0x80530019 (DataCloneError)"]
    1.94 +    // The best guess is that this happens when funky things have been added to the prototypes.
    1.95 +    // It doesn't happen for our "control" messages, only in messages from
    1.96 +    // content - so we explicitly use JSON on these messages as that avoids
    1.97 +    // the problem.
    1.98 +    this._postControlMessage("port-message", JSON.stringify(data));
    1.99 +  },
   1.100 +
   1.101 +  close: function fw_AbstractPort_close() {
   1.102 +    if (this._closed) {
   1.103 +      return; // already closed.
   1.104 +    }
   1.105 +    this._postControlMessage("port-close");
   1.106 +    // and clean myself up.
   1.107 +    this._handler = null;
   1.108 +    this._pendingMessagesIncoming = [];
   1.109 +    this._closed = true;
   1.110 +  }
   1.111 +};