If LSRequestChild actor is unexpectedly destroyed, the nested event loop runs
until the timer fires. This patch improves that by calling the callback in
LSRequestChild::ActorDestroyed which immediatelly finishes RequestHelper and
finishes the nested event loop in the end too.
Differential Revision: https://phabricator.services.mozilla.com/D48194
--HG--
extra : moz-landing-system : lando
This patch adds a timer for synchronous local storage requests. Once the timer
fires the request is canceled. The parent reports debugging information upon receiving cancellation.
Differential Revision: https://phabricator.services.mozilla.com/D24006
Summary: Really sorry for the size of the patch. It's mostly automatic
s/nsIDocument/Document/ but I had to fix up in a bunch of places manually to
add the right namespacing and such.
Overall it's not a very interesting patch I think.
nsDocument.cpp turns into Document.cpp, nsIDocument.h into Document.h and
nsIDocumentInlines.h into DocumentInlines.h.
I also changed a bunch of nsCOMPtr usage to RefPtr, but not all of it.
While fixing up some of the bits I also removed some unneeded OwnerDoc() null
checks and such, but I didn't do anything riskier than that.
There's now an upper limit for snapshot prefilling. The value is configurable and is currently set to 4096 bytes.
Snapshots can operate in multiple modes depending on if all items have been loaded or all keys have been received. This should provide the best performance for each specific state.
This patch also adds support for creating explicit snapshots which can be used for testing.
This improves performance a lot in cases when multiple operations are invoked by a single JS function (number of sync IPC calls is reduced to a minimum). It also improves correctness since changes are not visible to other content processes until a JS function finishes.
The patch implements core infrastructure, all items are sent to content when a snapshot is initialized and everything is fully working. However, sending of all items at once is not optimal for bigger databases. Support for lazy loading of items is implemented in a following patch.
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.
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.
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.
Daniel Varga
Sebastian Streich
Eric Rahm
Simon Giesecke
Boris Zbarsky
Jan Varga
Ehsan Akhgari
Andrea Marchesini
Ciure Andrei
Sylvestre Ledru
Yaron Tausky
Gurzau Raul
Emilio Cobos Álvarez
Andrew Sutherland