1510 lines
48 KiB
JavaScript
1510 lines
48 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Asynchronous front-end for OS.File.
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*
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* This front-end is meant to be imported from the main thread. In turn,
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* it spawns one worker (perhaps more in the future) and delegates all
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* disk I/O to this worker.
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*
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* Documentation note: most of the functions and methods in this module
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* return promises. For clarity, we denote as follows a promise that may resolve
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* with type |A| and some value |value| or reject with type |B| and some
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* reason |reason|
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* @resolves {A} value
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* @rejects {B} reason
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*/
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"use strict";
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this.EXPORTED_SYMBOLS = ["OS"];
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const Cu = Components.utils;
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const Ci = Components.interfaces;
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var SharedAll = {};
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Cu.import("resource://gre/modules/osfile/osfile_shared_allthreads.jsm", SharedAll);
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Cu.import("resource://gre/modules/XPCOMUtils.jsm", this);
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Cu.import("resource://gre/modules/Timer.jsm", this);
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// Boilerplate, to simplify the transition to require()
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var LOG = SharedAll.LOG.bind(SharedAll, "Controller");
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var isTypedArray = SharedAll.isTypedArray;
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// The constructor for file errors.
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var SysAll = {};
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if (SharedAll.Constants.Win) {
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Cu.import("resource://gre/modules/osfile/osfile_win_allthreads.jsm", SysAll);
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} else if (SharedAll.Constants.libc) {
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Cu.import("resource://gre/modules/osfile/osfile_unix_allthreads.jsm", SysAll);
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} else {
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throw new Error("I am neither under Windows nor under a Posix system");
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}
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var OSError = SysAll.Error;
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var Type = SysAll.Type;
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var Path = {};
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Cu.import("resource://gre/modules/osfile/ospath.jsm", Path);
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// The library of promises.
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Cu.import("resource://gre/modules/Promise.jsm", this);
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Cu.import("resource://gre/modules/Task.jsm", this);
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// The implementation of communications
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Cu.import("resource://gre/modules/PromiseWorker.jsm", this);
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Cu.import("resource://gre/modules/Services.jsm", this);
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Cu.import("resource://gre/modules/AsyncShutdown.jsm", this);
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var Native = Cu.import("resource://gre/modules/osfile/osfile_native.jsm", {});
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// It's possible for osfile.jsm to get imported before the profile is
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// set up. In this case, some path constants aren't yet available.
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// Here, we make them lazy loaders.
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function lazyPathGetter(constProp, dirKey) {
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return function () {
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let path;
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try {
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path = Services.dirsvc.get(dirKey, Ci.nsIFile).path;
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delete SharedAll.Constants.Path[constProp];
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SharedAll.Constants.Path[constProp] = path;
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} catch (ex) {
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// Ignore errors if the value still isn't available. Hopefully
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// the next access will return it.
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}
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return path;
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};
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}
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for (let [constProp, dirKey] of [
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["localProfileDir", "ProfLD"],
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["profileDir", "ProfD"],
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["userApplicationDataDir", "UAppData"],
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["winAppDataDir", "AppData"],
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["winStartMenuProgsDir", "Progs"],
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]) {
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if (constProp in SharedAll.Constants.Path) {
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continue;
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}
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LOG("Installing lazy getter for OS.Constants.Path." + constProp +
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" because it isn't defined and profile may not be loaded.");
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Object.defineProperty(SharedAll.Constants.Path, constProp, {
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get: lazyPathGetter(constProp, dirKey),
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});
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}
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/**
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* Return a shallow clone of the enumerable properties of an object.
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*/
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var clone = SharedAll.clone;
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/**
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* Extract a shortened version of an object, fit for logging.
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*
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* This function returns a copy of the original object in which all
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* long strings, Arrays, TypedArrays, ArrayBuffers are removed and
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* replaced with placeholders. Use this function to sanitize objects
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* if you wish to log them or to keep them in memory.
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*
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* @param {*} obj The obj to shorten.
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* @return {*} array A shorter object, fit for logging.
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*/
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function summarizeObject(obj) {
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if (!obj) {
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return null;
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}
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if (typeof obj == "string") {
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if (obj.length > 1024) {
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return {"Long string": obj.length};
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}
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return obj;
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}
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if (typeof obj == "object") {
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if (Array.isArray(obj)) {
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if (obj.length > 32) {
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return {"Long array": obj.length};
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}
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return obj.map(summarizeObject);
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}
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if ("byteLength" in obj) {
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// Assume TypedArray or ArrayBuffer
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return {"Binary Data": obj.byteLength};
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}
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let result = {};
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for (let k of Object.keys(obj)) {
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result[k] = summarizeObject(obj[k]);
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}
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return result;
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}
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return obj;
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}
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// In order to expose Scheduler to the unfiltered Cu.import return value variant
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// on B2G we need to save it to `this`. This does not make it public;
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// EXPORTED_SYMBOLS still controls that in all cases.
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var Scheduler = this.Scheduler = {
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/**
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* |true| once we have sent at least one message to the worker.
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* This field is unaffected by resetting the worker.
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*/
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launched: false,
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/**
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* |true| once shutdown has begun i.e. we should reject any
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* message, including resets.
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*/
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shutdown: false,
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/**
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* A promise resolved once all currently pending operations are complete.
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*
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* This promise is never rejected and the result is always undefined.
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*/
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queue: Promise.resolve(),
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/**
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* A promise resolved once all currently pending `kill` operations
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* are complete.
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*
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* This promise is never rejected and the result is always undefined.
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*/
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_killQueue: Promise.resolve(),
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/**
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* Miscellaneous debugging information
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*/
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Debugging: {
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/**
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* The latest message sent and still waiting for a reply.
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*/
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latestSent: undefined,
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/**
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* The latest reply received, or null if we are waiting for a reply.
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*/
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latestReceived: undefined,
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/**
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* Number of messages sent to the worker. This includes the
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* initial SET_DEBUG, if applicable.
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*/
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messagesSent: 0,
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/**
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* Total number of messages ever queued, including the messages
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* sent.
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*/
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messagesQueued: 0,
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/**
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* Number of messages received from the worker.
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*/
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messagesReceived: 0,
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},
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/**
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* A timer used to automatically shut down the worker after some time.
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*/
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resetTimer: null,
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/**
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* The worker to which to send requests.
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*
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* If the worker has never been created or has been reset, this is a
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* fresh worker, initialized with osfile_async_worker.js.
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*
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* @type {PromiseWorker}
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*/
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get worker() {
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if (!this._worker) {
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// Either the worker has never been created or it has been
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// reset. In either case, it is time to instantiate the worker.
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this._worker = new BasePromiseWorker("resource://gre/modules/osfile/osfile_async_worker.js");
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this._worker.log = LOG;
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this._worker.ExceptionHandlers["OS.File.Error"] = OSError.fromMsg;
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}
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return this._worker;
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},
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_worker: null,
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/**
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* Prepare to kill the OS.File worker after a few seconds.
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*/
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restartTimer: function(arg) {
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let delay = Services.prefs.getIntPref("osfile.reset_worker_delay", 0);
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if (!delay) {
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// Don't auto-shutdown if we don't have a delay preference set.
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return;
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}
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if (this.resetTimer) {
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clearTimeout(this.resetTimer);
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}
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this.resetTimer = setTimeout(
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() => Scheduler.kill({reset: true, shutdown: false}),
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delay
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);
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},
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/**
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* Shutdown OS.File.
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*
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* @param {*} options
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* - {boolean} shutdown If |true|, reject any further request. Otherwise,
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* further requests will resurrect the worker.
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* - {boolean} reset If |true|, instruct the worker to shutdown if this
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* would not cause leaks. Otherwise, assume that the worker will be shutdown
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* through some other mean.
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*/
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kill: function({shutdown, reset}) {
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// Grab the kill queue to make sure that we
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// cannot be interrupted by another call to `kill`.
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let killQueue = this._killQueue;
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// Deactivate the queue, to ensure that no message is sent
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// to an obsolete worker (we reactivate it in the `finally`).
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// This needs to be done right now so that we maintain relative
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// ordering with calls to post(), etc.
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let deferred = Promise.defer();
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let savedQueue = this.queue;
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this.queue = deferred.promise;
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return this._killQueue = Task.spawn(function*() {
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yield killQueue;
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// From this point, and until the end of the Task, we are the
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// only call to `kill`, regardless of any `yield`.
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yield savedQueue;
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try {
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// Enter critical section: no yield in this block
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// (we want to make sure that we remain the only
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// request in the queue).
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if (!this.launched || this.shutdown || !this._worker) {
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// Nothing to kill
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this.shutdown = this.shutdown || shutdown;
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this._worker = null;
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return null;
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}
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// Exit critical section
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let message = ["Meta_shutdown", [reset]];
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Scheduler.latestReceived = [];
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Scheduler.latestSent = [Date.now(),
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Task.Debugging.generateReadableStack(new Error().stack),
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...message];
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// Wait for result
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let resources;
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try {
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resources = yield this._worker.post(...message);
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Scheduler.latestReceived = [Date.now(), message];
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} catch (ex) {
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LOG("Could not dispatch Meta_reset", ex);
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// It's most likely a programmer error, but we'll assume that
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// the worker has been shutdown, as it's less risky than the
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// opposite stance.
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resources = {openedFiles: [], openedDirectoryIterators: [], killed: true};
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Scheduler.latestReceived = [Date.now(), message, ex];
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}
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let {openedFiles, openedDirectoryIterators, killed} = resources;
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if (!reset
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&& (openedFiles && openedFiles.length
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|| ( openedDirectoryIterators && openedDirectoryIterators.length))) {
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// The worker still holds resources. Report them.
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let msg = "";
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if (openedFiles.length > 0) {
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msg += "The following files are still open:\n" +
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openedFiles.join("\n");
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}
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if (openedDirectoryIterators.length > 0) {
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msg += "The following directory iterators are still open:\n" +
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openedDirectoryIterators.join("\n");
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}
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LOG("WARNING: File descriptors leaks detected.\n" + msg);
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}
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// Make sure that we do not leave an invalid |worker| around.
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if (killed || shutdown) {
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this._worker = null;
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}
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this.shutdown = shutdown;
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return resources;
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} finally {
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// Resume accepting messages. If we have set |shutdown| to |true|,
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// any pending/future request will be rejected. Otherwise, any
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// pending/future request will spawn a new worker if necessary.
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deferred.resolve();
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}
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}.bind(this));
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},
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/**
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* Push a task at the end of the queue.
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*
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* @param {function} code A function returning a Promise.
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* This function will be executed once all the previously
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* pushed tasks have completed.
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* @return {Promise} A promise with the same behavior as
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* the promise returned by |code|.
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*/
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push: function(code) {
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let promise = this.queue.then(code);
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// By definition, |this.queue| can never reject.
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this.queue = promise.then(null, () => undefined);
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// Fork |promise| to ensure that uncaught errors are reported
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return promise.then(null, null);
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},
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/**
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* Post a message to the worker thread.
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*
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* @param {string} method The name of the method to call.
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* @param {...} args The arguments to pass to the method. These arguments
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* must be clonable.
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* @return {Promise} A promise conveying the result/error caused by
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* calling |method| with arguments |args|.
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*/
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post: function post(method, args = undefined, closure = undefined) {
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if (this.shutdown) {
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LOG("OS.File is not available anymore. The following request has been rejected.",
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method, args);
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return Promise.reject(new Error("OS.File has been shut down. Rejecting post to " + method));
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}
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let firstLaunch = !this.launched;
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this.launched = true;
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if (firstLaunch && SharedAll.Config.DEBUG) {
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// If we have delayed sending SET_DEBUG, do it now.
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this.worker.post("SET_DEBUG", [true]);
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Scheduler.Debugging.messagesSent++;
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}
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Scheduler.Debugging.messagesQueued++;
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return this.push(Task.async(function*() {
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if (this.shutdown) {
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LOG("OS.File is not available anymore. The following request has been rejected.",
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method, args);
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throw new Error("OS.File has been shut down. Rejecting request to " + method);
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}
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// Update debugging information. As |args| may be quite
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// expensive, we only keep a shortened version of it.
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Scheduler.Debugging.latestReceived = null;
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Scheduler.Debugging.latestSent = [Date.now(), method, summarizeObject(args)];
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// Don't kill the worker just yet
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Scheduler.restartTimer();
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let reply;
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try {
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try {
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Scheduler.Debugging.messagesSent++;
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Scheduler.Debugging.latestSent = Scheduler.Debugging.latestSent.slice(0, 2);
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reply = yield this.worker.post(method, args, closure);
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Scheduler.Debugging.latestReceived = [Date.now(), summarizeObject(reply)];
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return reply;
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} finally {
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Scheduler.Debugging.messagesReceived++;
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}
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} catch (error) {
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Scheduler.Debugging.latestReceived = [Date.now(), error.message, error.fileName, error.lineNumber];
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throw error;
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} finally {
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if (firstLaunch) {
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Scheduler._updateTelemetry();
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}
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Scheduler.restartTimer();
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}
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}.bind(this)));
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},
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/**
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* Post Telemetry statistics.
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*
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* This is only useful on first launch.
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*/
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_updateTelemetry: function() {
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let worker = this.worker;
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let workerTimeStamps = worker.workerTimeStamps;
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if (!workerTimeStamps) {
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// If the first call to OS.File results in an uncaught errors,
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// the timestamps are absent. As this case is a developer error,
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// let's not waste time attempting to extract telemetry from it.
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return;
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}
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let HISTOGRAM_LAUNCH = Services.telemetry.getHistogramById("OSFILE_WORKER_LAUNCH_MS");
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HISTOGRAM_LAUNCH.add(worker.workerTimeStamps.entered - worker.launchTimeStamp);
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let HISTOGRAM_READY = Services.telemetry.getHistogramById("OSFILE_WORKER_READY_MS");
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HISTOGRAM_READY.add(worker.workerTimeStamps.loaded - worker.launchTimeStamp);
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}
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};
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const PREF_OSFILE_LOG = "toolkit.osfile.log";
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const PREF_OSFILE_LOG_REDIRECT = "toolkit.osfile.log.redirect";
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/**
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* Listen to PREF_OSFILE_LOG changes and update gShouldLog flag
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* appropriately.
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*/
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Services.prefs.addObserver(PREF_OSFILE_LOG,
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function prefObserver(aSubject, aTopic, aData) {
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SharedAll.Config.DEBUG = Services.prefs.getBoolPref(PREF_OSFILE_LOG, SharedAll.Config.DEBUG);
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if (Scheduler.launched) {
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// Don't start the worker just to set this preference.
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Scheduler.post("SET_DEBUG", [SharedAll.Config.DEBUG]);
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}
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}, false);
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SharedAll.Config.DEBUG = Services.prefs.getBoolPref(PREF_OSFILE_LOG, false);
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Services.prefs.addObserver(PREF_OSFILE_LOG_REDIRECT,
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function prefObserver(aSubject, aTopic, aData) {
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SharedAll.Config.TEST = Services.prefs.getBoolPref(PREF_OSFILE_LOG_REDIRECT, OS.Shared.TEST);
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}, false);
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SharedAll.Config.TEST = Services.prefs.getBoolPref(PREF_OSFILE_LOG_REDIRECT, false);
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|
|
|
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/**
|
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* If |true|, use the native implementaiton of OS.File methods
|
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* whenever possible. Otherwise, force the use of the JS version.
|
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*/
|
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var nativeWheneverAvailable = true;
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const PREF_OSFILE_NATIVE = "toolkit.osfile.native";
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Services.prefs.addObserver(PREF_OSFILE_NATIVE,
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function prefObserver(aSubject, aTopic, aData) {
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nativeWheneverAvailable = Services.prefs.getBoolPref(PREF_OSFILE_NATIVE, nativeWheneverAvailable);
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}, false);
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|
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// Update worker's DEBUG flag if it's true.
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// Don't start the worker just for this, though.
|
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if (SharedAll.Config.DEBUG && Scheduler.launched) {
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Scheduler.post("SET_DEBUG", [true]);
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}
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|
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// Observer topics used for monitoring shutdown
|
|
const WEB_WORKERS_SHUTDOWN_TOPIC = "web-workers-shutdown";
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|
|
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// Preference used to configure test shutdown observer.
|
|
const PREF_OSFILE_TEST_SHUTDOWN_OBSERVER =
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"toolkit.osfile.test.shutdown.observer";
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|
|
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AsyncShutdown.webWorkersShutdown.addBlocker(
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"OS.File: flush pending requests, warn about unclosed files, shut down service.",
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Task.async(function*() {
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// Give clients a last chance to enqueue requests.
|
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yield Barriers.shutdown.wait({crashAfterMS: null});
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|
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// Wait until all requests are complete and kill the worker.
|
|
yield Scheduler.kill({reset: false, shutdown: true});
|
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}),
|
|
() => {
|
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let details = Barriers.getDetails();
|
|
details.clients = Barriers.shutdown.state;
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return details;
|
|
}
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);
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|
|
// Attaching an observer for PREF_OSFILE_TEST_SHUTDOWN_OBSERVER to enable or
|
|
// disable the test shutdown event observer.
|
|
// Note: By default the PREF_OSFILE_TEST_SHUTDOWN_OBSERVER is unset.
|
|
// Note: This is meant to be used for testing purposes only.
|
|
Services.prefs.addObserver(PREF_OSFILE_TEST_SHUTDOWN_OBSERVER,
|
|
function prefObserver() {
|
|
// The temporary phase topic used to trigger the unclosed
|
|
// phase warning.
|
|
let TOPIC = Services.prefs.getCharPref(PREF_OSFILE_TEST_SHUTDOWN_OBSERVER,
|
|
"");
|
|
try {
|
|
} catch (x) {
|
|
}
|
|
if (TOPIC) {
|
|
// Generate a phase, add a blocker.
|
|
// Note that this can work only if AsyncShutdown itself has been
|
|
// configured for testing by the testsuite.
|
|
let phase = AsyncShutdown._getPhase(TOPIC);
|
|
phase.addBlocker(
|
|
"(for testing purposes) OS.File: warn about unclosed files",
|
|
() => Scheduler.kill({shutdown: false, reset: false})
|
|
);
|
|
}
|
|
}, false);
|
|
|
|
/**
|
|
* Representation of a file, with asynchronous methods.
|
|
*
|
|
* @param {*} fdmsg The _message_ representing the platform-specific file
|
|
* handle.
|
|
*
|
|
* @constructor
|
|
*/
|
|
var File = function File(fdmsg) {
|
|
// FIXME: At the moment, |File| does not close on finalize
|
|
// (see bug 777715)
|
|
this._fdmsg = fdmsg;
|
|
this._closeResult = null;
|
|
this._closed = null;
|
|
};
|
|
|
|
|
|
File.prototype = {
|
|
/**
|
|
* Close a file asynchronously.
|
|
*
|
|
* This method is idempotent.
|
|
*
|
|
* @return {promise}
|
|
* @resolves {null}
|
|
* @rejects {OS.File.Error}
|
|
*/
|
|
close: function close() {
|
|
if (this._fdmsg != null) {
|
|
let msg = this._fdmsg;
|
|
this._fdmsg = null;
|
|
return this._closeResult =
|
|
Scheduler.post("File_prototype_close", [msg], this);
|
|
}
|
|
return this._closeResult;
|
|
},
|
|
|
|
/**
|
|
* Fetch information about the file.
|
|
*
|
|
* @return {promise}
|
|
* @resolves {OS.File.Info} The latest information about the file.
|
|
* @rejects {OS.File.Error}
|
|
*/
|
|
stat: function stat() {
|
|
return Scheduler.post("File_prototype_stat", [this._fdmsg], this).then(
|
|
File.Info.fromMsg
|
|
);
|
|
},
|
|
|
|
/**
|
|
* Write bytes from a buffer to this file.
|
|
*
|
|
* Note that, by default, this function may perform several I/O
|
|
* operations to ensure that the buffer is fully written.
|
|
*
|
|
* @param {Typed array | C pointer} buffer The buffer in which the
|
|
* the bytes are stored. The buffer must be large enough to
|
|
* accomodate |bytes| bytes. Using the buffer before the operation
|
|
* is complete is a BAD IDEA.
|
|
* @param {*=} options Optionally, an object that may contain the
|
|
* following fields:
|
|
* - {number} bytes The number of |bytes| to write from the buffer. If
|
|
* unspecified, this is |buffer.byteLength|. Note that |bytes| is required
|
|
* if |buffer| is a C pointer.
|
|
*
|
|
* @return {number} The number of bytes actually written.
|
|
*/
|
|
write: function write(buffer, options = {}) {
|
|
// If |buffer| is a typed array and there is no |bytes| options,
|
|
// we need to extract the |byteLength| now, as it will be lost
|
|
// by communication.
|
|
// Options might be a nullish value, so better check for that before using
|
|
// the |in| operator.
|
|
if (isTypedArray(buffer) && !(options && "bytes" in options)) {
|
|
// Preserve reference to option |outExecutionDuration|, if it is passed.
|
|
options = clone(options, ["outExecutionDuration"]);
|
|
options.bytes = buffer.byteLength;
|
|
}
|
|
return Scheduler.post("File_prototype_write",
|
|
[this._fdmsg,
|
|
Type.void_t.in_ptr.toMsg(buffer),
|
|
options],
|
|
buffer/*Ensure that |buffer| is not gc-ed*/);
|
|
},
|
|
|
|
/**
|
|
* Read bytes from this file to a new buffer.
|
|
*
|
|
* @param {number=} bytes If unspecified, read all the remaining bytes from
|
|
* this file. If specified, read |bytes| bytes, or less if the file does not
|
|
* contain that many bytes.
|
|
* @param {JSON} options
|
|
* @return {promise}
|
|
* @resolves {Uint8Array} An array containing the bytes read.
|
|
*/
|
|
read: function read(nbytes, options = {}) {
|
|
let promise = Scheduler.post("File_prototype_read",
|
|
[this._fdmsg,
|
|
nbytes, options]);
|
|
return promise.then(
|
|
function onSuccess(data) {
|
|
return new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Return the current position in the file, as bytes.
|
|
*
|
|
* @return {promise}
|
|
* @resolves {number} The current position in the file,
|
|
* as a number of bytes since the start of the file.
|
|
*/
|
|
getPosition: function getPosition() {
|
|
return Scheduler.post("File_prototype_getPosition",
|
|
[this._fdmsg]);
|
|
},
|
|
|
|
/**
|
|
* Set the current position in the file, as bytes.
|
|
*
|
|
* @param {number} pos A number of bytes.
|
|
* @param {number} whence The reference position in the file,
|
|
* which may be either POS_START (from the start of the file),
|
|
* POS_END (from the end of the file) or POS_CUR (from the
|
|
* current position in the file).
|
|
*
|
|
* @return {promise}
|
|
*/
|
|
setPosition: function setPosition(pos, whence) {
|
|
return Scheduler.post("File_prototype_setPosition",
|
|
[this._fdmsg, pos, whence]);
|
|
},
|
|
|
|
/**
|
|
* Flushes the file's buffers and causes all buffered data
|
|
* to be written.
|
|
* Disk flushes are very expensive and therefore should be used carefully,
|
|
* sparingly and only in scenarios where it is vital that data survives
|
|
* system crashes. Even though the function will be executed off the
|
|
* main-thread, it might still affect the overall performance of any running
|
|
* application.
|
|
*
|
|
* @return {promise}
|
|
*/
|
|
flush: function flush() {
|
|
return Scheduler.post("File_prototype_flush",
|
|
[this._fdmsg]);
|
|
},
|
|
|
|
/**
|
|
* Set the file's access permissions. This does nothing on Windows.
|
|
*
|
|
* This operation is likely to fail if applied to a file that was
|
|
* not created by the currently running program (more precisely,
|
|
* if it was created by a program running under a different OS-level
|
|
* user account). It may also fail, or silently do nothing, if the
|
|
* filesystem containing the file does not support access permissions.
|
|
*
|
|
* @param {*=} options Object specifying the requested permissions:
|
|
*
|
|
* - {number} unixMode The POSIX file mode to set on the file. If omitted,
|
|
* the POSIX file mode is reset to the default used by |OS.file.open|. If
|
|
* specified, the permissions will respect the process umask as if they
|
|
* had been specified as arguments of |OS.File.open|, unless the
|
|
* |unixHonorUmask| parameter tells otherwise.
|
|
* - {bool} unixHonorUmask If omitted or true, any |unixMode| value is
|
|
* modified by the process umask, as |OS.File.open| would have done. If
|
|
* false, the exact value of |unixMode| will be applied.
|
|
*/
|
|
setPermissions: function setPermissions(options = {}) {
|
|
return Scheduler.post("File_prototype_setPermissions",
|
|
[this._fdmsg, options]);
|
|
}
|
|
};
|
|
|
|
|
|
if (SharedAll.Constants.Sys.Name != "Android") {
|
|
/**
|
|
* Set the last access and modification date of the file.
|
|
* The time stamp resolution is 1 second at best, but might be worse
|
|
* depending on the platform.
|
|
*
|
|
* WARNING: This method is not implemented on Android. On Android,
|
|
* you should use File.setDates instead.
|
|
*
|
|
* @return {promise}
|
|
* @rejects {TypeError}
|
|
* @rejects {OS.File.Error}
|
|
*/
|
|
File.prototype.setDates = function(accessDate, modificationDate) {
|
|
return Scheduler.post("File_prototype_setDates",
|
|
[this._fdmsg, accessDate, modificationDate], this);
|
|
};
|
|
}
|
|
|
|
|
|
/**
|
|
* Open a file asynchronously.
|
|
*
|
|
* @return {promise}
|
|
* @resolves {OS.File}
|
|
* @rejects {OS.Error}
|
|
*/
|
|
File.open = function open(path, mode, options) {
|
|
return Scheduler.post(
|
|
"open", [Type.path.toMsg(path), mode, options],
|
|
path
|
|
).then(
|
|
function onSuccess(msg) {
|
|
return new File(msg);
|
|
}
|
|
);
|
|
};
|
|
|
|
/**
|
|
* Creates and opens a file with a unique name. By default, generate a random HEX number and use it to create a unique new file name.
|
|
*
|
|
* @param {string} path The path to the file.
|
|
* @param {*=} options Additional options for file opening. This
|
|
* implementation interprets the following fields:
|
|
*
|
|
* - {number} humanReadable If |true|, create a new filename appending a decimal number. ie: filename-1.ext, filename-2.ext.
|
|
* If |false| use HEX numbers ie: filename-A65BC0.ext
|
|
* - {number} maxReadableNumber Used to limit the amount of tries after a failed
|
|
* file creation. Default is 20.
|
|
*
|
|
* @return {Object} contains A file object{file} and the path{path}.
|
|
* @throws {OS.File.Error} If the file could not be opened.
|
|
*/
|
|
File.openUnique = function openUnique(path, options) {
|
|
return Scheduler.post(
|
|
"openUnique", [Type.path.toMsg(path), options],
|
|
path
|
|
).then(
|
|
function onSuccess(msg) {
|
|
return {
|
|
path: msg.path,
|
|
file: new File(msg.file)
|
|
};
|
|
}
|
|
);
|
|
};
|
|
|
|
/**
|
|
* Get the information on the file.
|
|
*
|
|
* @return {promise}
|
|
* @resolves {OS.File.Info}
|
|
* @rejects {OS.Error}
|
|
*/
|
|
File.stat = function stat(path, options) {
|
|
return Scheduler.post(
|
|
"stat", [Type.path.toMsg(path), options],
|
|
path).then(File.Info.fromMsg);
|
|
};
|
|
|
|
|
|
/**
|
|
* Set the last access and modification date of the file.
|
|
* The time stamp resolution is 1 second at best, but might be worse
|
|
* depending on the platform.
|
|
*
|
|
* @return {promise}
|
|
* @rejects {TypeError}
|
|
* @rejects {OS.File.Error}
|
|
*/
|
|
File.setDates = function setDates(path, accessDate, modificationDate) {
|
|
return Scheduler.post("setDates",
|
|
[Type.path.toMsg(path), accessDate, modificationDate],
|
|
this);
|
|
};
|
|
|
|
/**
|
|
* Set the file's access permissions. This does nothing on Windows.
|
|
*
|
|
* This operation is likely to fail if applied to a file that was
|
|
* not created by the currently running program (more precisely,
|
|
* if it was created by a program running under a different OS-level
|
|
* user account). It may also fail, or silently do nothing, if the
|
|
* filesystem containing the file does not support access permissions.
|
|
*
|
|
* @param {string} path The path to the file.
|
|
* @param {*=} options Object specifying the requested permissions:
|
|
*
|
|
* - {number} unixMode The POSIX file mode to set on the file. If omitted,
|
|
* the POSIX file mode is reset to the default used by |OS.file.open|. If
|
|
* specified, the permissions will respect the process umask as if they
|
|
* had been specified as arguments of |OS.File.open|, unless the
|
|
* |unixHonorUmask| parameter tells otherwise.
|
|
* - {bool} unixHonorUmask If omitted or true, any |unixMode| value is
|
|
* modified by the process umask, as |OS.File.open| would have done. If
|
|
* false, the exact value of |unixMode| will be applied.
|
|
*/
|
|
File.setPermissions = function setPermissions(path, options = {}) {
|
|
return Scheduler.post("setPermissions",
|
|
[Type.path.toMsg(path), options]);
|
|
};
|
|
|
|
/**
|
|
* Fetch the current directory
|
|
*
|
|
* @return {promise}
|
|
* @resolves {string} The current directory, as a path usable with OS.Path
|
|
* @rejects {OS.Error}
|
|
*/
|
|
File.getCurrentDirectory = function getCurrentDirectory() {
|
|
return Scheduler.post(
|
|
"getCurrentDirectory"
|
|
).then(Type.path.fromMsg);
|
|
};
|
|
|
|
/**
|
|
* Change the current directory
|
|
*
|
|
* @param {string} path The OS-specific path to the current directory.
|
|
* You should use the methods of OS.Path and the constants of OS.Constants.Path
|
|
* to build OS-specific paths in a portable manner.
|
|
*
|
|
* @return {promise}
|
|
* @resolves {null}
|
|
* @rejects {OS.Error}
|
|
*/
|
|
File.setCurrentDirectory = function setCurrentDirectory(path) {
|
|
return Scheduler.post(
|
|
"setCurrentDirectory", [Type.path.toMsg(path)], path
|
|
);
|
|
};
|
|
|
|
/**
|
|
* Copy a file to a destination.
|
|
*
|
|
* @param {string} sourcePath The platform-specific path at which
|
|
* the file may currently be found.
|
|
* @param {string} destPath The platform-specific path at which the
|
|
* file should be copied.
|
|
* @param {*=} options An object which may contain the following fields:
|
|
*
|
|
* @option {bool} noOverwrite - If true, this function will fail if
|
|
* a file already exists at |destPath|. Otherwise, if this file exists,
|
|
* it will be erased silently.
|
|
*
|
|
* @rejects {OS.File.Error} In case of any error.
|
|
*
|
|
* General note: The behavior of this function is defined only when
|
|
* it is called on a single file. If it is called on a directory, the
|
|
* behavior is undefined and may not be the same across all platforms.
|
|
*
|
|
* General note: The behavior of this function with respect to metadata
|
|
* is unspecified. Metadata may or may not be copied with the file. The
|
|
* behavior may not be the same across all platforms.
|
|
*/
|
|
File.copy = function copy(sourcePath, destPath, options) {
|
|
return Scheduler.post("copy", [Type.path.toMsg(sourcePath),
|
|
Type.path.toMsg(destPath), options], [sourcePath, destPath]);
|
|
};
|
|
|
|
/**
|
|
* Move a file to a destination.
|
|
*
|
|
* @param {string} sourcePath The platform-specific path at which
|
|
* the file may currently be found.
|
|
* @param {string} destPath The platform-specific path at which the
|
|
* file should be moved.
|
|
* @param {*=} options An object which may contain the following fields:
|
|
*
|
|
* @option {bool} noOverwrite - If set, this function will fail if
|
|
* a file already exists at |destPath|. Otherwise, if this file exists,
|
|
* it will be erased silently.
|
|
*
|
|
* @returns {Promise}
|
|
* @rejects {OS.File.Error} In case of any error.
|
|
*
|
|
* General note: The behavior of this function is defined only when
|
|
* it is called on a single file. If it is called on a directory, the
|
|
* behavior is undefined and may not be the same across all platforms.
|
|
*
|
|
* General note: The behavior of this function with respect to metadata
|
|
* is unspecified. Metadata may or may not be moved with the file. The
|
|
* behavior may not be the same across all platforms.
|
|
*/
|
|
File.move = function move(sourcePath, destPath, options) {
|
|
return Scheduler.post("move", [Type.path.toMsg(sourcePath),
|
|
Type.path.toMsg(destPath), options], [sourcePath, destPath]);
|
|
};
|
|
|
|
/**
|
|
* Create a symbolic link to a source.
|
|
*
|
|
* @param {string} sourcePath The platform-specific path to which
|
|
* the symbolic link should point.
|
|
* @param {string} destPath The platform-specific path at which the
|
|
* symbolic link should be created.
|
|
*
|
|
* @returns {Promise}
|
|
* @rejects {OS.File.Error} In case of any error.
|
|
*/
|
|
if (!SharedAll.Constants.Win) {
|
|
File.unixSymLink = function unixSymLink(sourcePath, destPath) {
|
|
return Scheduler.post("unixSymLink", [Type.path.toMsg(sourcePath),
|
|
Type.path.toMsg(destPath)], [sourcePath, destPath]);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Gets the number of bytes available on disk to the current user.
|
|
*
|
|
* @param {string} Platform-specific path to a directory on the disk to
|
|
* query for free available bytes.
|
|
*
|
|
* @return {number} The number of bytes available for the current user.
|
|
* @throws {OS.File.Error} In case of any error.
|
|
*/
|
|
File.getAvailableFreeSpace = function getAvailableFreeSpace(sourcePath) {
|
|
return Scheduler.post("getAvailableFreeSpace",
|
|
[Type.path.toMsg(sourcePath)], sourcePath
|
|
).then(Type.uint64_t.fromMsg);
|
|
};
|
|
|
|
/**
|
|
* Remove an empty directory.
|
|
*
|
|
* @param {string} path The name of the directory to remove.
|
|
* @param {*=} options Additional options.
|
|
* - {bool} ignoreAbsent If |true|, do not fail if the
|
|
* directory does not exist yet.
|
|
*/
|
|
File.removeEmptyDir = function removeEmptyDir(path, options) {
|
|
return Scheduler.post("removeEmptyDir",
|
|
[Type.path.toMsg(path), options], path);
|
|
};
|
|
|
|
/**
|
|
* Remove an existing file.
|
|
*
|
|
* @param {string} path The name of the file.
|
|
* @param {*=} options Additional options.
|
|
* - {bool} ignoreAbsent If |false|, throw an error if the file does
|
|
* not exist. |true| by default.
|
|
*
|
|
* @throws {OS.File.Error} In case of I/O error.
|
|
*/
|
|
File.remove = function remove(path, options) {
|
|
return Scheduler.post("remove",
|
|
[Type.path.toMsg(path), options], path);
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
* Create a directory and, optionally, its parent directories.
|
|
*
|
|
* @param {string} path The name of the directory.
|
|
* @param {*=} options Additional options.
|
|
*
|
|
* - {string} from If specified, the call to |makeDir| creates all the
|
|
* ancestors of |path| that are descendants of |from|. Note that |path|
|
|
* must be a descendant of |from|, and that |from| and its existing
|
|
* subdirectories present in |path| must be user-writeable.
|
|
* Example:
|
|
* makeDir(Path.join(profileDir, "foo", "bar"), { from: profileDir });
|
|
* creates directories profileDir/foo, profileDir/foo/bar
|
|
* - {bool} ignoreExisting If |false|, throw an error if the directory
|
|
* already exists. |true| by default. Ignored if |from| is specified.
|
|
* - {number} unixMode Under Unix, if specified, a file creation mode,
|
|
* as per libc function |mkdir|. If unspecified, dirs are
|
|
* created with a default mode of 0700 (dir is private to
|
|
* the user, the user can read, write and execute). Ignored under Windows
|
|
* or if the file system does not support file creation modes.
|
|
* - {C pointer} winSecurity Under Windows, if specified, security
|
|
* attributes as per winapi function |CreateDirectory|. If
|
|
* unspecified, use the default security descriptor, inherited from
|
|
* the parent directory. Ignored under Unix or if the file system
|
|
* does not support security descriptors.
|
|
*/
|
|
File.makeDir = function makeDir(path, options) {
|
|
return Scheduler.post("makeDir",
|
|
[Type.path.toMsg(path), options], path);
|
|
};
|
|
|
|
/**
|
|
* Return the contents of a file
|
|
*
|
|
* @param {string} path The path to the file.
|
|
* @param {number=} bytes Optionally, an upper bound to the number of bytes
|
|
* to read. DEPRECATED - please use options.bytes instead.
|
|
* @param {JSON} options Additional options.
|
|
* - {boolean} sequential A flag that triggers a population of the page cache
|
|
* with data from a file so that subsequent reads from that file would not
|
|
* block on disk I/O. If |true| or unspecified, inform the system that the
|
|
* contents of the file will be read in order. Otherwise, make no such
|
|
* assumption. |true| by default.
|
|
* - {number} bytes An upper bound to the number of bytes to read.
|
|
* - {string} compression If "lz4" and if the file is compressed using the lz4
|
|
* compression algorithm, decompress the file contents on the fly.
|
|
*
|
|
* @resolves {Uint8Array} A buffer holding the bytes
|
|
* read from the file.
|
|
*/
|
|
File.read = function read(path, bytes, options = {}) {
|
|
if (typeof bytes == "object") {
|
|
// Passing |bytes| as an argument is deprecated.
|
|
// We should now be passing it as a field of |options|.
|
|
options = bytes || {};
|
|
} else {
|
|
options = clone(options, ["outExecutionDuration"]);
|
|
if (typeof bytes != "undefined") {
|
|
options.bytes = bytes;
|
|
}
|
|
}
|
|
|
|
if (options.compression || !nativeWheneverAvailable) {
|
|
// We need to use the JS implementation.
|
|
let promise = Scheduler.post("read",
|
|
[Type.path.toMsg(path), bytes, options], path);
|
|
return promise.then(
|
|
function onSuccess(data) {
|
|
if (typeof data == "string") {
|
|
return data;
|
|
}
|
|
return new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
|
|
});
|
|
}
|
|
|
|
// Otherwise, use the native implementation.
|
|
return Scheduler.push(() => Native.read(path, options));
|
|
};
|
|
|
|
/**
|
|
* Find outs if a file exists.
|
|
*
|
|
* @param {string} path The path to the file.
|
|
*
|
|
* @return {bool} true if the file exists, false otherwise.
|
|
*/
|
|
File.exists = function exists(path) {
|
|
return Scheduler.post("exists",
|
|
[Type.path.toMsg(path)], path);
|
|
};
|
|
|
|
/**
|
|
* Write a file, atomically.
|
|
*
|
|
* By opposition to a regular |write|, this operation ensures that,
|
|
* until the contents are fully written, the destination file is
|
|
* not modified.
|
|
*
|
|
* Limitation: In a few extreme cases (hardware failure during the
|
|
* write, user unplugging disk during the write, etc.), data may be
|
|
* corrupted. If your data is user-critical (e.g. preferences,
|
|
* application data, etc.), you may wish to consider adding options
|
|
* |tmpPath| and/or |flush| to reduce the likelihood of corruption, as
|
|
* detailed below. Note that no combination of options can be
|
|
* guaranteed to totally eliminate the risk of corruption.
|
|
*
|
|
* @param {string} path The path of the file to modify.
|
|
* @param {Typed Array | C pointer} buffer A buffer containing the bytes to write.
|
|
* @param {*=} options Optionally, an object determining the behavior
|
|
* of this function. This object may contain the following fields:
|
|
* - {number} bytes The number of bytes to write. If unspecified,
|
|
* |buffer.byteLength|. Required if |buffer| is a C pointer.
|
|
* - {string} tmpPath If |null| or unspecified, write all data directly
|
|
* to |path|. If specified, write all data to a temporary file called
|
|
* |tmpPath| and, once this write is complete, rename the file to
|
|
* replace |path|. Performing this additional operation is a little
|
|
* slower but also a little safer.
|
|
* - {bool} noOverwrite - If set, this function will fail if a file already
|
|
* exists at |path|.
|
|
* - {bool} flush - If |false| or unspecified, return immediately once the
|
|
* write is complete. If |true|, before writing, force the operating system
|
|
* to write its internal disk buffers to the disk. This is considerably slower
|
|
* (not just for the application but for the whole system) but also safer:
|
|
* if the system shuts down improperly (typically due to a kernel freeze
|
|
* or a power failure) or if the device is disconnected before the buffer
|
|
* is flushed, the file has more chances of not being corrupted.
|
|
* - {string} backupTo - If specified, backup the destination file as |backupTo|.
|
|
* Note that this function renames the destination file before overwriting it.
|
|
* If the process or the operating system freezes or crashes
|
|
* during the short window between these operations,
|
|
* the destination file will have been moved to its backup.
|
|
*
|
|
* @return {promise}
|
|
* @resolves {number} The number of bytes actually written.
|
|
*/
|
|
File.writeAtomic = function writeAtomic(path, buffer, options = {}) {
|
|
// Copy |options| to avoid modifying the original object but preserve the
|
|
// reference to |outExecutionDuration| option if it is passed.
|
|
options = clone(options, ["outExecutionDuration"]);
|
|
// As options.tmpPath is a path, we need to encode it as |Type.path| message
|
|
if ("tmpPath" in options) {
|
|
options.tmpPath = Type.path.toMsg(options.tmpPath);
|
|
};
|
|
if (isTypedArray(buffer) && (!("bytes" in options))) {
|
|
options.bytes = buffer.byteLength;
|
|
};
|
|
let promise = Scheduler.post("writeAtomic",
|
|
[Type.path.toMsg(path),
|
|
Type.void_t.in_ptr.toMsg(buffer),
|
|
options], [options, buffer, path]);
|
|
return promise;
|
|
};
|
|
|
|
File.removeDir = function(path, options = {}) {
|
|
return Scheduler.post("removeDir",
|
|
[Type.path.toMsg(path), options], path);
|
|
};
|
|
|
|
/**
|
|
* Information on a file, as returned by OS.File.stat or
|
|
* OS.File.prototype.stat
|
|
*
|
|
* @constructor
|
|
*/
|
|
File.Info = function Info(value) {
|
|
// Note that we can't just do this[k] = value[k] because our
|
|
// prototype defines getters for all of these fields.
|
|
for (let k in value) {
|
|
if (k != "creationDate") {
|
|
Object.defineProperty(this, k, {value: value[k]});
|
|
}
|
|
}
|
|
Object.defineProperty(this, "_deprecatedCreationDate", {value: value["creationDate"]});
|
|
};
|
|
File.Info.prototype = SysAll.AbstractInfo.prototype;
|
|
|
|
// Deprecated
|
|
Object.defineProperty(File.Info.prototype, "creationDate", {
|
|
get: function creationDate() {
|
|
let {Deprecated} = Cu.import("resource://gre/modules/Deprecated.jsm", {});
|
|
Deprecated.warning("Field 'creationDate' is deprecated.", "https://developer.mozilla.org/en-US/docs/JavaScript_OS.File/OS.File.Info#Cross-platform_Attributes");
|
|
return this._deprecatedCreationDate;
|
|
}
|
|
});
|
|
|
|
File.Info.fromMsg = function fromMsg(value) {
|
|
return new File.Info(value);
|
|
};
|
|
|
|
/**
|
|
* Get worker's current DEBUG flag.
|
|
* Note: This is used for testing purposes.
|
|
*/
|
|
File.GET_DEBUG = function GET_DEBUG() {
|
|
return Scheduler.post("GET_DEBUG");
|
|
};
|
|
|
|
/**
|
|
* Iterate asynchronously through a directory
|
|
*
|
|
* @constructor
|
|
*/
|
|
var DirectoryIterator = function DirectoryIterator(path, options) {
|
|
/**
|
|
* Open the iterator on the worker thread
|
|
*
|
|
* @type {Promise}
|
|
* @resolves {*} A message accepted by the methods of DirectoryIterator
|
|
* in the worker thread
|
|
* @rejects {StopIteration} If all entries have already been visited
|
|
* or the iterator has been closed.
|
|
*/
|
|
this.__itmsg = Scheduler.post(
|
|
"new_DirectoryIterator", [Type.path.toMsg(path), options],
|
|
path
|
|
);
|
|
this._isClosed = false;
|
|
};
|
|
DirectoryIterator.prototype = {
|
|
iterator: function () {
|
|
return this;
|
|
},
|
|
__iterator__: function () {
|
|
return this;
|
|
},
|
|
|
|
// Once close() is called, _itmsg should reject with a
|
|
// StopIteration. However, we don't want to create the promise until
|
|
// it's needed because it might never be used. In that case, we
|
|
// would get a warning on the console.
|
|
get _itmsg() {
|
|
if (!this.__itmsg) {
|
|
this.__itmsg = Promise.reject(StopIteration);
|
|
}
|
|
return this.__itmsg;
|
|
},
|
|
|
|
/**
|
|
* Determine whether the directory exists.
|
|
*
|
|
* @resolves {boolean}
|
|
*/
|
|
exists: function exists() {
|
|
return this._itmsg.then(
|
|
function onSuccess(iterator) {
|
|
return Scheduler.post("DirectoryIterator_prototype_exists", [iterator]);
|
|
}
|
|
);
|
|
},
|
|
/**
|
|
* Get the next entry in the directory.
|
|
*
|
|
* @return {Promise}
|
|
* @resolves {OS.File.Entry}
|
|
* @rejects {StopIteration} If all entries have already been visited.
|
|
*/
|
|
next: function next() {
|
|
let self = this;
|
|
let promise = this._itmsg;
|
|
|
|
// Get the iterator, call _next
|
|
promise = promise.then(
|
|
function withIterator(iterator) {
|
|
return self._next(iterator);
|
|
});
|
|
|
|
return promise;
|
|
},
|
|
/**
|
|
* Get several entries at once.
|
|
*
|
|
* @param {number=} length If specified, the number of entries
|
|
* to return. If unspecified, return all remaining entries.
|
|
* @return {Promise}
|
|
* @resolves {Array} An array containing the |length| next entries.
|
|
*/
|
|
nextBatch: function nextBatch(size) {
|
|
if (this._isClosed) {
|
|
return Promise.resolve([]);
|
|
}
|
|
let promise = this._itmsg;
|
|
promise = promise.then(
|
|
function withIterator(iterator) {
|
|
return Scheduler.post("DirectoryIterator_prototype_nextBatch", [iterator, size]);
|
|
});
|
|
promise = promise.then(
|
|
function withEntries(array) {
|
|
return array.map(DirectoryIterator.Entry.fromMsg);
|
|
});
|
|
return promise;
|
|
},
|
|
/**
|
|
* Apply a function to all elements of the directory sequentially.
|
|
*
|
|
* @param {Function} cb This function will be applied to all entries
|
|
* of the directory. It receives as arguments
|
|
* - the OS.File.Entry corresponding to the entry;
|
|
* - the index of the entry in the enumeration;
|
|
* - the iterator itself - return |iterator.close()| to stop the loop.
|
|
*
|
|
* If the callback returns a promise, iteration waits until the
|
|
* promise is resolved before proceeding.
|
|
*
|
|
* @return {Promise} A promise resolved once the loop has reached
|
|
* its end.
|
|
*/
|
|
forEach: function forEach(cb, options) {
|
|
if (this._isClosed) {
|
|
return Promise.resolve();
|
|
}
|
|
|
|
let self = this;
|
|
let position = 0;
|
|
let iterator;
|
|
|
|
// Grab iterator
|
|
let promise = this._itmsg.then(
|
|
function(aIterator) {
|
|
iterator = aIterator;
|
|
}
|
|
);
|
|
|
|
// Then iterate
|
|
let loop = function loop() {
|
|
if (self._isClosed) {
|
|
return Promise.resolve();
|
|
}
|
|
return self._next(iterator).then(
|
|
function onSuccess(value) {
|
|
return Promise.resolve(cb(value, position++, self)).then(loop);
|
|
},
|
|
function onFailure(reason) {
|
|
if (reason == StopIteration) {
|
|
return;
|
|
}
|
|
throw reason;
|
|
}
|
|
);
|
|
};
|
|
|
|
return promise.then(loop);
|
|
},
|
|
/**
|
|
* Auxiliary method: fetch the next item
|
|
*
|
|
* @rejects {StopIteration} If all entries have already been visited
|
|
* or the iterator has been closed.
|
|
*/
|
|
_next: function _next(iterator) {
|
|
if (this._isClosed) {
|
|
return this._itmsg;
|
|
}
|
|
let self = this;
|
|
let promise = Scheduler.post("DirectoryIterator_prototype_next", [iterator]);
|
|
promise = promise.then(
|
|
DirectoryIterator.Entry.fromMsg,
|
|
function onReject(reason) {
|
|
if (reason == StopIteration) {
|
|
self.close();
|
|
throw StopIteration;
|
|
}
|
|
throw reason;
|
|
});
|
|
return promise;
|
|
},
|
|
/**
|
|
* Close the iterator
|
|
*/
|
|
close: function close() {
|
|
if (this._isClosed) {
|
|
return Promise.resolve();
|
|
}
|
|
this._isClosed = true;
|
|
let self = this;
|
|
return this._itmsg.then(
|
|
function withIterator(iterator) {
|
|
// Set __itmsg to null so that the _itmsg getter returns a
|
|
// rejected StopIteration promise if it's ever used.
|
|
self.__itmsg = null;
|
|
return Scheduler.post("DirectoryIterator_prototype_close", [iterator]);
|
|
}
|
|
);
|
|
}
|
|
};
|
|
|
|
DirectoryIterator.Entry = function Entry(value) {
|
|
return value;
|
|
};
|
|
DirectoryIterator.Entry.prototype = Object.create(SysAll.AbstractEntry.prototype);
|
|
|
|
DirectoryIterator.Entry.fromMsg = function fromMsg(value) {
|
|
return new DirectoryIterator.Entry(value);
|
|
};
|
|
|
|
File.resetWorker = function() {
|
|
return Task.spawn(function*() {
|
|
let resources = yield Scheduler.kill({shutdown: false, reset: true});
|
|
if (resources && !resources.killed) {
|
|
throw new Error("Could not reset worker, this would leak file descriptors: " + JSON.stringify(resources));
|
|
}
|
|
});
|
|
};
|
|
|
|
// Constants
|
|
File.POS_START = SysAll.POS_START;
|
|
File.POS_CURRENT = SysAll.POS_CURRENT;
|
|
File.POS_END = SysAll.POS_END;
|
|
|
|
// Exports
|
|
File.Error = OSError;
|
|
File.DirectoryIterator = DirectoryIterator;
|
|
|
|
this.OS = {};
|
|
this.OS.File = File;
|
|
this.OS.Constants = SharedAll.Constants;
|
|
this.OS.Shared = {
|
|
LOG: SharedAll.LOG,
|
|
Type: SysAll.Type,
|
|
get DEBUG() {
|
|
return SharedAll.Config.DEBUG;
|
|
},
|
|
set DEBUG(x) {
|
|
return SharedAll.Config.DEBUG = x;
|
|
}
|
|
};
|
|
Object.freeze(this.OS.Shared);
|
|
this.OS.Path = Path;
|
|
|
|
// Returns a resolved promise when all the queued operation have been completed.
|
|
Object.defineProperty(OS.File, "queue", {
|
|
get: function() {
|
|
return Scheduler.queue;
|
|
}
|
|
});
|
|
|
|
// `true` if this is a content process, `false` otherwise.
|
|
// It would be nicer to go through `Services.appInfo`, but some tests need to be
|
|
// able to replace that field with a custom implementation before it is first
|
|
// called.
|
|
const isContent = Components.classes["@mozilla.org/xre/app-info;1"].getService(Ci.nsIXULRuntime).processType == Ci.nsIXULRuntime.PROCESS_TYPE_CONTENT;
|
|
|
|
/**
|
|
* Shutdown barriers, to let clients register to be informed during shutdown.
|
|
*/
|
|
var Barriers = {
|
|
shutdown: new AsyncShutdown.Barrier("OS.File: Waiting for clients before full shutdown"),
|
|
/**
|
|
* Return the shutdown state of OS.File
|
|
*/
|
|
getDetails: function() {
|
|
let result = {
|
|
launched: Scheduler.launched,
|
|
shutdown: Scheduler.shutdown,
|
|
worker: !!Scheduler._worker,
|
|
pendingReset: !!Scheduler.resetTimer,
|
|
latestSent: Scheduler.Debugging.latestSent,
|
|
latestReceived: Scheduler.Debugging.latestReceived,
|
|
messagesSent: Scheduler.Debugging.messagesSent,
|
|
messagesReceived: Scheduler.Debugging.messagesReceived,
|
|
messagesQueued: Scheduler.Debugging.messagesQueued,
|
|
DEBUG: SharedAll.Config.DEBUG,
|
|
};
|
|
// Convert dates to strings for better readability
|
|
for (let key of ["latestSent", "latestReceived"]) {
|
|
if (result[key] && typeof result[key][0] == "number") {
|
|
result[key][0] = Date(result[key][0]);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
};
|
|
|
|
function setupShutdown(phaseName) {
|
|
Barriers[phaseName] = new AsyncShutdown.Barrier(`OS.File: Waiting for clients before ${phaseName}`),
|
|
File[phaseName] = Barriers[phaseName].client;
|
|
|
|
// Auto-flush OS.File during `phaseName`. This ensures that any I/O
|
|
// that has been queued *before* `phaseName` is properly completed.
|
|
// To ensure that I/O queued *during* `phaseName` change is completed,
|
|
// clients should register using AsyncShutdown.addBlocker.
|
|
AsyncShutdown[phaseName].addBlocker(
|
|
`OS.File: flush I/O queued before ${phaseName}`,
|
|
Task.async(function*() {
|
|
// Give clients a last chance to enqueue requests.
|
|
yield Barriers[phaseName].wait({crashAfterMS: null});
|
|
|
|
// Wait until all currently enqueued requests are completed.
|
|
yield Scheduler.queue;
|
|
}),
|
|
() => {
|
|
let details = Barriers.getDetails();
|
|
details.clients = Barriers[phaseName].state;
|
|
return details;
|
|
}
|
|
);
|
|
}
|
|
|
|
// profile-before-change only exists in the parent, and OS.File should
|
|
// not be used in the child process anyways.
|
|
if (!isContent) {
|
|
setupShutdown("profileBeforeChange")
|
|
}
|
|
File.shutdown = Barriers.shutdown.client;
|