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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
AsyncShutdown: "resource://gre/modules/AsyncShutdown.sys.mjs",
FileUtils: "resource://gre/modules/FileUtils.sys.mjs",
});
const StorageSyncArea = Components.Constructor(
"@mozilla.org/extensions/storage/internal/sync-area;1",
"mozIConfigurableExtensionStorageArea",
"configure"
);
/**
* An XPCOM service for the WebExtension `storage.sync` API. The service manages
* a storage area for storing and syncing extension data.
*
* The service configures its storage area with the database path, and hands
* out references to the configured area via `getInterface`. It also registers
* a shutdown blocker to automatically tear down the area.
*
* ## What's the difference between `storage/internal/storage-sync-area;1` and
* `storage/sync;1`?
*
* `components.conf` has two classes:
* `@mozilla.org/extensions/storage/internal/sync-area;1` and
* `@mozilla.org/extensions/storage/sync;1`.
*
* The `storage/internal/sync-area;1` class is implemented in Rust, and can be
* instantiated using `createInstance` and `Components.Constructor`. It's not
* a singleton, so creating a new instance will create a new `storage.sync`
* area, with its own database connection. It's useful for testing, but not
* meant to be used outside of this module.
*
* The `storage/sync;1` class is implemented in this file. It's a singleton,
* ensuring there's only one `storage.sync` area, with one database connection.
* The service implements `nsIInterfaceRequestor`, so callers can access the
* storage interface like this:
*
* let storageSyncArea = Cc["@mozilla.org/extensions/storage/sync;1"]
* .getService(Ci.nsIInterfaceRequestor)
* .getInterface(Ci.mozIExtensionStorageArea);
*
* ...And the Sync interface like this:
*
* let extensionStorageEngine = Cc["@mozilla.org/extensions/storage/sync;1"]
* .getService(Ci.nsIInterfaceRequestor)
* .getInterface(Ci.mozIBridgedSyncEngine);
*
* @class
*/
export function StorageSyncService() {
if (StorageSyncService._singleton) {
return StorageSyncService._singleton;
}
let file = new lazy.FileUtils.File(
PathUtils.join(PathUtils.profileDir, "storage-sync-v2.sqlite")
);
let kintoFile = new lazy.FileUtils.File(
PathUtils.join(PathUtils.profileDir, "storage-sync.sqlite")
);
this._storageArea = new StorageSyncArea(file, kintoFile);
// Register a blocker to close the storage connection on shutdown.
this._shutdownBound = () => this._shutdown();
lazy.AsyncShutdown.profileChangeTeardown.addBlocker(
"StorageSyncService: shutdown",
this._shutdownBound
);
StorageSyncService._singleton = this;
}
StorageSyncService._singleton = null;
StorageSyncService.prototype = {
QueryInterface: ChromeUtils.generateQI(["nsIInterfaceRequestor"]),
// Returns the storage and syncing interfaces. This just hands out a
// reference to the underlying storage area, with a quick check to make sure
// that callers are asking for the right interfaces.
getInterface(iid) {
if (
iid.equals(Ci.mozIExtensionStorageArea) ||
iid.equals(Ci.mozIBridgedSyncEngine)
) {
return this._storageArea.QueryInterface(iid);
}
throw Components.Exception(
"This interface isn't implemented",
Cr.NS_ERROR_NO_INTERFACE
);
},
// Tears down the storage area and lifts the blocker so that shutdown can
// continue.
async _shutdown() {
try {
await new Promise((resolve, reject) => {
this._storageArea.teardown({
handleSuccess: resolve,
handleError(code, message) {
reject(Components.Exception(message, code));
},
});
});
} finally {
lazy.AsyncShutdown.profileChangeTeardown.removeBlocker(
this._shutdownBound
);
}
},
};
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