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Issue 5768064935133184: Issue 2021 - Replaced FileSystem API with chrome.storage.local (Closed)
Patch Set: Rebased Created April 10, 2015, 6:54 a.m.
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1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-2015 Eyeo GmbH
4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation.
8 *
9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 const keyPrefix = "file:";
19
20 function fileToKey(file)
21 {
22 return keyPrefix + (file instanceof FakeFile ? file.path : file.spec);
23 }
24
25 function loadFile(file, successCallback, errorCallback)
26 {
27 let key = fileToKey(file);
28
29 ext.storage.get([key], function(items)
30 {
31 let entry = items[key];
32
33 if (entry)
34 successCallback(entry);
35 else
36 errorCallback(new Error("File doesn't exist"));
37 });
38 }
39
40 function saveFile(file, data, callback)
41 {
42 ext.storage.set(
43 fileToKey(file),
44 {
45 content: data,
46 lastModified: Date.now()
47 },
48 callback
49 );
50 }
51
52 exports.IO =
53 {
54 resolveFilePath: function(path)
55 {
56 return new FakeFile(path);
57 },
58
59 readFromFile: function(file, listener, callback)
60 {
61 runWhenMigrated(function()
62 {
63 function onLoaded(entry)
64 {
65 for (let line of entry.content)
66 listener.process(line);
67
68 listener.process(null);
69 callback(null);
70 }
71
72 loadFile(file, onLoaded, callback);
73 });
74 },
75
76 writeToFile: function(file, data, callback)
77 {
78 runWhenMigrated(function()
79 {
80 saveFile(file, data, callback);
81 });
82 },
83
84 copyFile: function(fromFile, toFile, callback)
85 {
86 runWhenMigrated(function()
87 {
88 function onLoaded(entry)
89 {
90 saveFile(toFile, entry.content, callback);
91 }
92
93 loadFile(fromFile, onLoaded, callback);
94 });
95 },
96
97 renameFile: function(fromFile, newName, callback)
98 {
99 runWhenMigrated(function()
100 {
101 function onLoaded()
102 {
103 ext.storage.remove(fileToKey(fromFile), function()
104 {
105 ext.storage.set(keyPrefix + newName, entry, callback);
106 });
107 }
108
109 loadFile(fromFile, onLoaded, callback);
110 });
111 },
112
113 removeFile: function(file, callback)
114 {
115 runWhenMigrated(function()
116 {
117 ext.storage.remove(fileToKey(file), callback);
118 });
119 },
120
121 statFile: function(file, callback)
122 {
123 runWhenMigrated(function()
124 {
125 function onLoaded(entry)
126 {
127 callback(null, {
128 exists: true,
129 lastModified: entry.lastModified
130 });
131 }
132
133 loadFile(file, onLoaded, callback);
134 });
135 }
136 };
137
138 // Migrate files for users updating from old versions.
139 // Defer IO operations until migration is complete.
140 // TODO: Remove the migration code after a few releases.
141 let migrated = false;
142 let deferred = [];
143
144 function runWhenMigrated(callback)
145 {
146 if (migrated)
147 callback();
148 else
149 deferred.push(callback);
150 }
151
152 ext.storage.migrateFiles(function()
153 {
154 migrated = true;
155
156 while (deferred.length > 0)
157 deferred.shift()();
158 });
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