The Tor Browser / file comparison
comparison: dom/apps/src/FreeSpaceWatcher.jsm
dom/apps/src/FreeSpaceWatcher.jsm
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 3 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 "use strict"; | |
| 6 | |
| 7 const Cc = Components.classes; | |
| 8 const Ci = Components.interfaces; | |
| 9 const Cu = Components.utils; | |
| 10 | |
| 11 Cu.import("resource://gre/modules/Services.jsm"); | |
| 12 Cu.import("resource://gre/modules/FileUtils.jsm"); | |
| 13 | |
| 14 this.EXPORTED_SYMBOLS = ["FreeSpaceWatcher"]; | |
| 15 | |
| 16 function debug(aMsg) { | |
| 17 //dump("-*-*- FreeSpaceWatcher.jsm : " + aMsg + "\n"); | |
| 18 } | |
| 19 | |
| 20 // Polling delay for free space, in ms. | |
| 21 const DEFAULT_WATCHER_DELAY = 1000; | |
| 22 | |
| 23 this.FreeSpaceWatcher = { | |
| 24 timers: {}, | |
| 25 id: 0, | |
| 26 | |
| 27 /** | |
| 28 * This function will call aOnStatusChange | |
| 29 * each time the free space for apps crosses aThreshold, checking | |
| 30 * every aDelay milliseconds, or every second by default. | |
| 31 * aOnStatusChange is called with either "free" or "full" and will | |
| 32 * always be called at least one to get the initial status. | |
| 33 * @param aThreshold The amount of space in bytes to watch for. | |
| 34 * @param aOnStatusChange The function called when the state changes. | |
| 35 * @param aDelay How often (in ms) we check free space. Defaults | |
| 36 * to DEFAULT_WATCHER_DELAY. | |
| 37 * @return An opaque value to use with stop(). | |
| 38 */ | |
| 39 create: function spaceWatcher_create(aThreshold, aOnStatusChange, aDelay) { | |
| 40 let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer); | |
| 41 debug("Creating new FreeSpaceWatcher"); | |
| 42 let callback = { | |
| 43 currentStatus: null, | |
| 44 notify: function(aTimer) { | |
| 45 try { | |
| 46 let checkFreeSpace = function (freeBytes) { | |
| 47 debug("Free bytes: " + freeBytes); | |
| 48 let newStatus = freeBytes > aThreshold; | |
| 49 if (newStatus != callback.currentStatus) { | |
| 50 debug("New status: " + (newStatus ? "free" : "full")); | |
| 51 aOnStatusChange(newStatus ? "free" : "full"); | |
| 52 callback.currentStatus = newStatus; | |
| 53 } | |
| 54 }; | |
| 55 | |
| 56 let navigator = Services.wm.getMostRecentWindow("navigator:browser") | |
| 57 .navigator; | |
| 58 let deviceStorage = null; | |
| 59 | |
| 60 if (navigator.getDeviceStorage) { | |
| 61 deviceStorage = navigator.getDeviceStorage("apps"); | |
| 62 } | |
| 63 | |
| 64 if (deviceStorage) { | |
| 65 let req = deviceStorage.freeSpace(); | |
| 66 req.onsuccess = req.onerror = function statResult(e) { | |
| 67 if (!e.target.result) { | |
| 68 return; | |
| 69 } | |
| 70 | |
| 71 let freeBytes = e.target.result; | |
| 72 checkFreeSpace(freeBytes); | |
| 73 } | |
| 74 } else { | |
| 75 // deviceStorage isn't available, so use the webappsDir instead. | |
| 76 // This needs to be moved from a hardcoded string to DIRECTORY_NAME | |
| 77 // in AppsUtils. See bug 852685. | |
| 78 let dir = FileUtils.getDir("webappsDir", ["webapps"], true, true); | |
| 79 let freeBytes; | |
| 80 try { | |
| 81 freeBytes = dir.diskSpaceAvailable; | |
| 82 } catch(e) { | |
| 83 // If disk space information isn't available, we should assume | |
| 84 // that there is enough free space, and that we'll fail when | |
| 85 // we actually run out of disk space. | |
| 86 callback.currentStatus = true; | |
| 87 } | |
| 88 if (freeBytes) { | |
| 89 // We have disk space information. Call this here so that | |
| 90 // any exceptions are caught in the outer catch block. | |
| 91 checkFreeSpace(freeBytes); | |
| 92 } | |
| 93 } | |
| 94 } catch(e) { | |
| 95 // If the aOnStatusChange callback has errored we'll end up here. | |
| 96 debug(e); | |
| 97 } | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 timer.initWithCallback(callback, aDelay || DEFAULT_WATCHER_DELAY, | |
| 102 Ci.nsITimer.TYPE_REPEATING_SLACK); | |
| 103 let id = "timer-" + this.id++; | |
| 104 this.timers[id] = timer; | |
| 105 return id; | |
| 106 }, | |
| 107 | |
| 108 /** | |
| 109 * This function stops a running watcher. | |
| 110 * @param aId The opaque timer id returned by create(). | |
| 111 */ | |
| 112 stop: function spaceWatcher_stop(aId) { | |
| 113 if (this.timers[aId]) { | |
| 114 this.timers[aId].cancel(); | |
| 115 delete this.timers[aId]; | |
| 116 } | |
| 117 } | |
| 118 } |
