gecko/services/sync/modules/base_records/wbo.js

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Weave.
 *
 * The Initial Developer of the Original Code is Mozilla.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Dan Mills <thunder@mozilla.com>
 *  Richard Newman <rnewman@mozilla.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

const EXPORTED_SYMBOLS = ['WBORecord', 'RecordManager', 'Records'];

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;

Cu.import("resource://services-sync/log4moz.js");
Cu.import("resource://services-sync/resource.js");
Cu.import("resource://services-sync/util.js");

function WBORecord(collection, id) {
  this.data = {};
  this.payload = {};
  this.collection = collection;      // Optional.
  this.id = id;                      // Optional.
}
WBORecord.prototype = {
  _logName: "Record.WBO",

  get sortindex() {
    if (this.data.sortindex)
      return this.data.sortindex;
    return 0;
  },

  // Get thyself from your URI, then deserialize.
  // Set thine 'response' field.
  fetch: function fetch(uri) {
    let r = new Resource(uri).get();
    if (r.success) {
      this.deserialize(r);   // Warning! Muffles exceptions!
    }
    this.response = r;
    return this;
  },
  
  upload: function upload(uri) {
    return new Resource(uri).put(this);
  },
  
  // Take a base URI string, with trailing slash, and return the URI of this
  // WBO based on collection and ID.
  uri: function(base) {
    if (this.collection && this.id)
      return Utils.makeURL(base + this.collection + "/" + this.id);
    return null;
  },
  
  deserialize: function deserialize(json) {
    this.data = json.constructor.toString() == String ? JSON.parse(json) : json;

    try {
      // The payload is likely to be JSON, but if not, keep it as a string
      this.payload = JSON.parse(this.payload);
    } catch(ex) {}
  },

  toJSON: function toJSON() {
    // Copy fields from data to be stringified, making sure payload is a string
    let obj = {};
    for (let [key, val] in Iterator(this.data))
      obj[key] = key == "payload" ? JSON.stringify(val) : val;
    return obj;
  },

  toString: function WBORec_toString() "{ " + [
      "id: " + this.id,
      "index: " + this.sortindex,
      "modified: " + this.modified,
      "payload: " + JSON.stringify(this.payload)
    ].join("\n  ") + " }",
};

Utils.deferGetSet(WBORecord, "data", ["id", "modified", "sortindex", "payload"]);

Utils.lazy(this, 'Records', RecordManager);

function RecordManager() {
  this._log = Log4Moz.repository.getLogger(this._logName);
  this._records = {};
}
RecordManager.prototype = {
  _recordType: WBORecord,
  _logName: "RecordMgr",

  import: function RecordMgr_import(url) {
    this._log.trace("Importing record: " + (url.spec ? url.spec : url));
    try {
      // Clear out the last response with empty object if GET fails
      this.response = {};
      this.response = new Resource(url).get();

      // Don't parse and save the record on failure
      if (!this.response.success)
        return null;

      let record = new this._recordType(url);
      record.deserialize(this.response);

      return this.set(url, record);
    } catch(ex) {
      this._log.debug("Failed to import record: " + Utils.exceptionStr(ex));
      return null;
    }
  },

  get: function RecordMgr_get(url) {
    // Use a url string as the key to the hash
    let spec = url.spec ? url.spec : url;
    if (spec in this._records)
      return this._records[spec];
    return this.import(url);
  },

  set: function RecordMgr_set(url, record) {
    let spec = url.spec ? url.spec : url;
    return this._records[spec] = record;
  },

  contains: function RecordMgr_contains(url) {
    if ((url.spec || url) in this._records)
      return true;
    return false;
  },

  clearCache: function recordMgr_clearCache() {
    this._records = {};
  },

  del: function RecordMgr_del(url) {
    delete this._records[url];
  }
};