If a database actor already exists for given origin, reuse it instead of creating a new one. This improves memory footprint a bit and also eliminates some round trips to the parent process.
This patch was enhanced by asuth to bind attached database path.
Places has shown that argument binding is necessary. (Profiles may include usernames in their path which can have cool emoji and such.)
Datastores are preloaded only for content principals. The preloading is triggered as soon as possible to lower the chance of blocking the main thread in content process. If there is no physical database on disk for given origin, datastore is not created. Preloaded datastores are kept alive for 20 seconds.
New methods open() and close() are added to the Storage WebIDL interface. They are only available when a pref is set and are only intended for testing. There's also a new method resetStoragesForPrincipal() which is used as a callback for close() since datastores don't release directory locks immediately. resetStoragesForPrincipal() requests an exclusive lock for given origin, so it must wait for any exising shared locks to be released.
An attribute for checking if the next gen local storage implementation is enabled is exposed via a new interface nsILocalStorageManager which should be used for any other local storage specific stuff.
Storage events are fired either directly after getting response from synchronous SetItem call or through observers. When a new onstorage event listener is added, we sycnhronously register an observer in the parent process. There's always only one observer actor per content process.
PBackgroundLSDatabase is now managed by a new PBackgroundLSObject protocol. PBackgroundLSObject is needed to eliminate the need to pass the principal info and document URI everytime a write operation occurs.
Preparation of an observer shares some states with preparation of a datastore, so common stuff now lives in LSRequestBase and preparation of a datastore now implements a nested state machine.
This patch was enhanced by asuth to drop observers only when the last storage listener is removed.
EventListenerRemoved is invoked on any removal, not just the final removal, so we need to make sure it's the final removal before dropping observer.
Since we keep/cache data in memory anyway, private browsing support is mostly about avoiding any persistence related calls and clearing private browsing datastores when we get a notification. The separation between normal and private browsing datastores is done by the privateBrowsingId attribute which is part of the origin string.
Introduced a Connection and a ConnectioThread object.
All I/O requests are processed by a new single thread managed by ConnectionThread object.
Connection objects are prepared by the prepare datastore operation and then kept alive by datastores just like directory locks.
All datastore I/O operations are wrapped in a transaction which automaticaly commits after 5 seconds.
Datastore preparation now also loads all items from the database.
Expose the nested main event target, so it can be used in the single process case by the parent side to process runnables which need to run on the main thread.
After this change we don't have use hacks like getting profile directory path on the child side and sending it to the parent. The parent side can now do it freely even in the single process case.
This patch was enhanced by asuth to not tunnel the nested main event target through IPC.
Preparation of datastores now creates real database files on disk. The LocalStorage directory is protected by a directory lock.
Infrastructure for database schema upgrades is in place too.
Database actors are now explicitely tracked by the datastore. When the last actor finishes the directory lock is released.
Added also implementation for QuotaClient::GetUsageForOrigin() and QuotaClient::AbortOperations().
This adds a new quota client implementation, but only implements ShutdownWorkThreads.
At shutdown we wait for all running operations to finish including database actors which are closed by using an extra IPC message which avoids races between the parent and child.
Databases are dropped on the child side as soon as they are not used (e.g. after unlinking by the cycle collector).
The implementation is based on a cache (datastore) living in the parent process and sync IPC calls initiated from content processes.
IPC communication is done using per principal/origin database actors which connect to the datastore.
The synchronous blocking of the main thread is done by creating a nested event target and spinning the event loop.
Jan Varga