storage/public/mozIStorageService.idl@97036ab72558 (annotated)
storage/public/mozIStorageService.idl
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: idl; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include "nsISupports.idl" |
| michael@0 | 7 | |
| michael@0 | 8 | interface mozIStorageConnection; |
| michael@0 | 9 | interface nsIFile; |
| michael@0 | 10 | interface nsIFileURL; |
| michael@0 | 11 | interface nsIPropertyBag2; |
| michael@0 | 12 | interface nsIVariant; |
| michael@0 | 13 | interface mozIStorageCompletionCallback; |
| michael@0 | 14 | |
| michael@0 | 15 | /** |
| michael@0 | 16 | * The mozIStorageService interface is intended to be implemented by |
| michael@0 | 17 | * a service that can create storage connections (mozIStorageConnection) |
| michael@0 | 18 | * to either a well-known profile database or to a specific database file. |
| michael@0 | 19 | * |
| michael@0 | 20 | * This is the only way to open a database connection. |
| michael@0 | 21 | * |
| michael@0 | 22 | * @note The first reference to mozIStorageService must be made on the main |
| michael@0 | 23 | * thread. |
| michael@0 | 24 | */ |
| michael@0 | 25 | [scriptable, uuid(07b6b2f5-6d97-47b4-9584-e65bc467fe9e)] |
| michael@0 | 26 | interface mozIStorageService : nsISupports { |
| michael@0 | 27 | /** |
| michael@0 | 28 | * Open an asynchronous connection to a database. |
| michael@0 | 29 | * |
| michael@0 | 30 | * This method MUST be called from the main thread. The connection object |
| michael@0 | 31 | * returned by this function is not threadsafe. You MUST use it only from |
| michael@0 | 32 | * the main thread. |
| michael@0 | 33 | * |
| michael@0 | 34 | * If you have more than one connection to a file, you MUST use the EXACT |
| michael@0 | 35 | * SAME NAME for the file each time, including case. The sqlite code uses |
| michael@0 | 36 | * a simple string compare to see if there is already a connection. Opening |
| michael@0 | 37 | * a connection to "Foo.sqlite" and "foo.sqlite" will CORRUPT YOUR DATABASE. |
| michael@0 | 38 | * |
| michael@0 | 39 | * @param aDatabaseStore Either a nsIFile representing the file that contains |
| michael@0 | 40 | * the database or a special string to open a special database. The special |
| michael@0 | 41 | * string may be: |
| michael@0 | 42 | * - "memory" to open an in-memory database. |
| michael@0 | 43 | * |
| michael@0 | 44 | * @param aOptions A set of options (may be null). Options may contain: |
| michael@0 | 45 | * - bool shared (defaults to |false|). |
| michael@0 | 46 | * -- If |true|, opens the database with a shared-cache. The |
| michael@0 | 47 | * shared-cache mode is more memory-efficient when many |
| michael@0 | 48 | * connections to the same database are expected, though, the |
| michael@0 | 49 | * connections will contend the cache resource. In any cases |
| michael@0 | 50 | * where performance matter, working without a shared-cache will |
| michael@0 | 51 | * improve concurrency. @see openUnsharedDatabase |
| michael@0 | 52 | * |
| michael@0 | 53 | * - int growthIncrement (defaults to none). |
| michael@0 | 54 | * -- Set the growth increment for the main database. This hints SQLite to |
| michael@0 | 55 | * grow the database file by a given chunk size and may reduce |
| michael@0 | 56 | * filesystem fragmentation on large databases. |
| michael@0 | 57 | * @see mozIStorageConnection::setGrowthIncrement |
| michael@0 | 58 | * |
| michael@0 | 59 | * @param aCallback A callback that will receive the result of the operation. |
| michael@0 | 60 | * In case of error, it may receive as status: |
| michael@0 | 61 | * - NS_ERROR_OUT_OF_MEMORY if allocating a new storage object fails. |
| michael@0 | 62 | * - NS_ERROR_FILE_CORRUPTED if the database file is corrupted. |
| michael@0 | 63 | * In case of success, it receives as argument the new database |
| michael@0 | 64 | * connection, as an instance of |mozIStorageAsyncConnection|. |
| michael@0 | 65 | * |
| michael@0 | 66 | * @throws NS_ERROR_INVALID_ARG if |aDatabaseStore| is neither a file nor |
| michael@0 | 67 | * one of the special strings understood by this method, or if one of |
| michael@0 | 68 | * the options passed through |aOptions| does not have the right type. |
| michael@0 | 69 | * @throws NS_ERROR_NOT_SAME_THREAD if called from a thread other than the |
| michael@0 | 70 | * main thread. |
| michael@0 | 71 | */ |
| michael@0 | 72 | void openAsyncDatabase(in nsIVariant aDatabaseStore, |
| michael@0 | 73 | [optional] in nsIPropertyBag2 aOptions, |
| michael@0 | 74 | in mozIStorageCompletionCallback aCallback); |
| michael@0 | 75 | /** |
| michael@0 | 76 | * Get a connection to a named special database storage. |
| michael@0 | 77 | * |
| michael@0 | 78 | * @param aStorageKey a string key identifying the type of storage |
| michael@0 | 79 | * requested. Valid values include: "memory". |
| michael@0 | 80 | * |
| michael@0 | 81 | * @see openDatabase for restrictions on how database connections may be |
| michael@0 | 82 | * used. For the profile database, you should only access it from the main |
| michael@0 | 83 | * thread since other callers may also have connections. |
| michael@0 | 84 | * |
| michael@0 | 85 | * @returns a new mozIStorageConnection for the requested |
| michael@0 | 86 | * storage database. |
| michael@0 | 87 | * |
| michael@0 | 88 | * @throws NS_ERROR_INVALID_ARG if aStorageKey is invalid. |
| michael@0 | 89 | */ |
| michael@0 | 90 | mozIStorageConnection openSpecialDatabase(in string aStorageKey); |
| michael@0 | 91 | |
| michael@0 | 92 | /** |
| michael@0 | 93 | * Open a connection to the specified file. |
| michael@0 | 94 | * |
| michael@0 | 95 | * Consumers should check mozIStorageConnection::connectionReady to ensure |
| michael@0 | 96 | * that they can use the database. If this value is false, it is strongly |
| michael@0 | 97 | * recommended that the database be backed up with |
| michael@0 | 98 | * mozIStorageConnection::backupDB so user data is not lost. |
| michael@0 | 99 | * |
| michael@0 | 100 | * ========== |
| michael@0 | 101 | * DANGER |
| michael@0 | 102 | * ========== |
| michael@0 | 103 | * |
| michael@0 | 104 | * If you have more than one connection to a file, you MUST use the EXACT |
| michael@0 | 105 | * SAME NAME for the file each time, including case. The sqlite code uses |
| michael@0 | 106 | * a simple string compare to see if there is already a connection. Opening |
| michael@0 | 107 | * a connection to "Foo.sqlite" and "foo.sqlite" will CORRUPT YOUR DATABASE. |
| michael@0 | 108 | * |
| michael@0 | 109 | * The connection object returned by this function is not threadsafe. You must |
| michael@0 | 110 | * use it only from the thread you created it from. |
| michael@0 | 111 | * |
| michael@0 | 112 | * @param aDatabaseFile |
| michael@0 | 113 | * A nsIFile that represents the database that is to be opened.. |
| michael@0 | 114 | * |
| michael@0 | 115 | * @returns a mozIStorageConnection for the requested database file. |
| michael@0 | 116 | * |
| michael@0 | 117 | * @throws NS_ERROR_OUT_OF_MEMORY |
| michael@0 | 118 | * If allocating a new storage object fails. |
| michael@0 | 119 | * @throws NS_ERROR_FILE_CORRUPTED |
| michael@0 | 120 | * If the database file is corrupted. |
| michael@0 | 121 | */ |
| michael@0 | 122 | mozIStorageConnection openDatabase(in nsIFile aDatabaseFile); |
| michael@0 | 123 | |
| michael@0 | 124 | /** |
| michael@0 | 125 | * Open a connection to the specified file that doesn't share a sqlite cache. |
| michael@0 | 126 | * |
| michael@0 | 127 | * Without a shared-cache, each connection uses its own pages cache, which |
| michael@0 | 128 | * may be memory inefficient with a large number of connections, in such a |
| michael@0 | 129 | * case so you should use openDatabase instead. On the other side, if cache |
| michael@0 | 130 | * contention may be an issue, for instance when concurrency is important to |
| michael@0 | 131 | * ensure responsiveness, using unshared connections may be a performance win. |
| michael@0 | 132 | * |
| michael@0 | 133 | * ========== |
| michael@0 | 134 | * DANGER |
| michael@0 | 135 | * ========== |
| michael@0 | 136 | * |
| michael@0 | 137 | * If you have more than one connection to a file, you MUST use the EXACT |
| michael@0 | 138 | * SAME NAME for the file each time, including case. The sqlite code uses |
| michael@0 | 139 | * a simple string compare to see if there is already a connection. Opening |
| michael@0 | 140 | * a connection to "Foo.sqlite" and "foo.sqlite" will CORRUPT YOUR DATABASE. |
| michael@0 | 141 | * |
| michael@0 | 142 | * The connection object returned by this function is not threadsafe. You must |
| michael@0 | 143 | * use it only from the thread you created it from. |
| michael@0 | 144 | * |
| michael@0 | 145 | * @param aDatabaseFile |
| michael@0 | 146 | * A nsIFile that represents the database that is to be opened. |
| michael@0 | 147 | * |
| michael@0 | 148 | * @returns a mozIStorageConnection for the requested database file. |
| michael@0 | 149 | * |
| michael@0 | 150 | * @throws NS_ERROR_OUT_OF_MEMORY |
| michael@0 | 151 | * If allocating a new storage object fails. |
| michael@0 | 152 | * @throws NS_ERROR_FILE_CORRUPTED |
| michael@0 | 153 | * If the database file is corrupted. |
| michael@0 | 154 | */ |
| michael@0 | 155 | mozIStorageConnection openUnsharedDatabase(in nsIFile aDatabaseFile); |
| michael@0 | 156 | |
| michael@0 | 157 | /** |
| michael@0 | 158 | * See openDatabase(). Exactly the same only initialized with a file URL. |
| michael@0 | 159 | * Custom parameters can be passed to SQLite and VFS implementations through |
| michael@0 | 160 | * the query part of the URL. |
| michael@0 | 161 | * |
| michael@0 | 162 | * @param aURL |
| michael@0 | 163 | * A nsIFileURL that represents the database that is to be opened. |
| michael@0 | 164 | */ |
| michael@0 | 165 | mozIStorageConnection openDatabaseWithFileURL(in nsIFileURL aFileURL); |
| michael@0 | 166 | |
| michael@0 | 167 | /* |
| michael@0 | 168 | * Utilities |
| michael@0 | 169 | */ |
| michael@0 | 170 | |
| michael@0 | 171 | /** |
| michael@0 | 172 | * Copies the specified database file to the specified parent directory with |
| michael@0 | 173 | * the specified file name. If the parent directory is not specified, it |
| michael@0 | 174 | * places the backup in the same directory as the current file. This function |
| michael@0 | 175 | * ensures that the file being created is unique. |
| michael@0 | 176 | * |
| michael@0 | 177 | * @param aDBFile |
| michael@0 | 178 | * The database file that will be backed up. |
| michael@0 | 179 | * @param aBackupFileName |
| michael@0 | 180 | * The name of the new backup file to create. |
| michael@0 | 181 | * @param [optional] aBackupParentDirectory |
| michael@0 | 182 | * The directory you'd like the backup file to be placed. |
| michael@0 | 183 | * @return The nsIFile representing the backup file. |
| michael@0 | 184 | */ |
| michael@0 | 185 | nsIFile backupDatabaseFile(in nsIFile aDBFile, in AString aBackupFileName, |
| michael@0 | 186 | [optional] in nsIFile aBackupParentDirectory); |
| michael@0 | 187 | }; |
| michael@0 | 188 | |
| michael@0 | 189 | %{C++ |
| michael@0 | 190 | |
| michael@0 | 191 | #define MOZ_STORAGE_MEMORY_STORAGE_KEY "memory" |
| michael@0 | 192 | |
| michael@0 | 193 | %} |
