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Side by Side Diff: chrome/renderer/resources/extensions/last_error.js

Issue 307833002: Move some extensions renderer resources to extensions_renderer_resources.grd. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: rebase Created 6 years, 6 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 var GetAvailability = requireNative('v8_context').GetAvailability;
6 var GetGlobal = requireNative('sendRequest').GetGlobal;
7
8 // Utility for setting chrome.*.lastError.
9 //
10 // A utility here is useful for two reasons:
11 // 1. For backwards compatibility we need to set chrome.extension.lastError,
12 // but not all contexts actually have access to the extension namespace.
13 // 2. When calling across contexts, the global object that gets lastError set
14 // needs to be that of the caller. We force callers to explicitly specify
15 // the chrome object to try to prevent bugs here.
16
17 /**
18 * Sets the last error for |name| on |targetChrome| to |message| with an
19 * optional |stack|.
20 */
21 function set(name, message, stack, targetChrome) {
22 var errorMessage = name + ': ' + message;
23 if (stack != null && stack != '')
24 errorMessage += '\n' + stack;
25
26 if (!targetChrome)
27 throw new Error('No chrome object to set error: ' + errorMessage);
28 clear(targetChrome); // in case somebody has set a sneaky getter/setter
29
30 var errorObject = { message: message };
31 if (GetAvailability('extension.lastError').is_available)
32 targetChrome.extension.lastError = errorObject;
33
34 assertRuntimeIsAvailable();
35
36 // We check to see if developers access runtime.lastError in order to decide
37 // whether or not to log it in the (error) console.
38 privates(targetChrome.runtime).accessedLastError = false;
39 $Object.defineProperty(targetChrome.runtime, 'lastError', {
40 configurable: true,
41 get: function() {
42 privates(targetChrome.runtime).accessedLastError = true;
43 return errorObject;
44 },
45 set: function(error) {
46 errorObject = errorObject;
47 }});
48 };
49
50 /**
51 * Check if anyone has checked chrome.runtime.lastError since it was set.
52 * @param {Object} targetChrome the Chrome object to check.
53 * @return boolean True if the lastError property was set.
54 */
55 function hasAccessed(targetChrome) {
56 assertRuntimeIsAvailable();
57 return privates(targetChrome.runtime).accessedLastError === true;
58 }
59
60 /**
61 * Check whether there is an error set on |targetChrome| without setting
62 * |accessedLastError|.
63 * @param {Object} targetChrome the Chrome object to check.
64 * @return boolean Whether lastError has been set.
65 */
66 function hasError(targetChrome) {
67 if (!targetChrome)
68 throw new Error('No target chrome to check');
69
70 assertRuntimeIsAvailable();
71 if ('lastError' in targetChrome.runtime)
72 return true;
73
74 return false;
75 };
76
77 /**
78 * Clears the last error on |targetChrome|.
79 */
80 function clear(targetChrome) {
81 if (!targetChrome)
82 throw new Error('No target chrome to clear error');
83
84 if (GetAvailability('extension.lastError').is_available)
85 delete targetChrome.extension.lastError;
86
87 assertRuntimeIsAvailable();
88 delete targetChrome.runtime.lastError;
89 delete privates(targetChrome.runtime).accessedLastError;
90 };
91
92 function assertRuntimeIsAvailable() {
93 // chrome.runtime should always be available, but maybe it's disappeared for
94 // some reason? Add debugging for http://crbug.com/258526.
95 var runtimeAvailability = GetAvailability('runtime.lastError');
96 if (!runtimeAvailability.is_available) {
97 throw new Error('runtime.lastError is not available: ' +
98 runtimeAvailability.message);
99 }
100 if (!chrome.runtime)
101 throw new Error('runtime namespace is null or undefined');
102 }
103
104 /**
105 * Runs |callback(args)| with last error args as in set().
106 *
107 * The target chrome object is the global object's of the callback, so this
108 * method won't work if the real callback has been wrapped (etc).
109 */
110 function run(name, message, stack, callback, args) {
111 var targetChrome = GetGlobal(callback).chrome;
112 set(name, message, stack, targetChrome);
113 try {
114 $Function.apply(callback, undefined, args);
115 } finally {
116 clear(targetChrome);
117 }
118 }
119
120 exports.clear = clear;
121 exports.hasAccessed = hasAccessed;
122 exports.hasError = hasError;
123 exports.set = set;
124 exports.run = run;
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