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104 lines
2.9 KiB
JavaScript
104 lines
2.9 KiB
JavaScript
/* -*- Mode: js2; js2-basic-offset: 2; indent-tabs-mode: nil; -*- */
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/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
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/* 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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"use strict";
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const EXPORTED_SYMBOLS = ["Logger"];
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const PREF_DEBUG = "toolkit.identity.debug";
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const Cu = Components.utils;
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const Ci = Components.interfaces;
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const Cc = Components.classes;
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const Cr = Components.results;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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function IdentityLogger() {
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Services.prefs.addObserver(PREF_DEBUG, this, false);
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this._debug = Services.prefs.getBoolPref(PREF_DEBUG);
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return this;
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}
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IdentityLogger.prototype = {
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QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports, Ci.nsIObserver]),
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observe: function observe(aSubject, aTopic, aData) {
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switch(aTopic) {
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case "nsPref:changed":
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this._debug = Services.prefs.getBoolPref(PREF_DEBUG);
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break;
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case "quit-application-granted":
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Services.prefs.removeObserver(PREF_DEBUG, this);
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break;
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default:
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this.log("Logger observer", "Unknown topic:", aTopic);
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break;
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}
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},
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_generateLogMessage: function _generateLogMessage(aPrefix, args) {
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// create a string representation of a list of arbitrary things
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let strings = [];
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// XXX bug 770418 - args look like flattened array, not list of strings
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args.forEach(function(arg) {
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if (typeof arg === 'string') {
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strings.push(arg);
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} else if (typeof arg === 'undefined') {
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strings.push('undefined');
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} else if (arg === null) {
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strings.push('null');
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} else {
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try {
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strings.push(JSON.stringify(arg, null, 2));
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} catch(err) {
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strings.push("<<something>>");
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}
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}
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});
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return 'Identity ' + aPrefix + ': ' + strings.join(' ');
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},
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/**
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* log() - utility function to print a list of arbitrary things
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*
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* Enable with about:config pref toolkit.identity.debug
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*/
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log: function log(aPrefix, ...args) {
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if (!this._debug) {
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return;
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}
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let output = this._generateLogMessage(aPrefix, args);
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dump(output + "\n");
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// Additionally, make the output visible in the Error Console
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Services.console.logStringMessage(output);
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},
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/**
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* reportError() - report an error through component utils as well as
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* our log function
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*/
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reportError: function reportError(aPrefix, ...aArgs) {
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let prefix = aPrefix + ' ERROR';
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// Report the error in the browser
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let output = this._generateLogMessage(aPrefix, aArgs);
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Cu.reportError(output);
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dump("ERROR: " + output + "\n");
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for (let frame = Components.stack.caller; frame; frame = frame.caller) {
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dump(frame + "\n");
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}
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}
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};
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let Logger = new IdentityLogger();
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