1190661 - Send push only to child processes on e10s

Status: RESOLVED FIXED

(Core :: DOM: Push Subscriptions, defect)

Description

[Nikhil Marathe [:nsm] (No longer reading bugmail, please needinfo?)]

See commit message in incoming attachment for description.

Comment 1

[Nikhil Marathe [:nsm] (No longer reading bugmail, please needinfo?)]

Attachment: MozReview Request: Bug 1190661 - Send push only to child processes when in e10s mode. r?smaug

Bug 1190661 - Send push only to child processes when in e10s mode. r?smaug

Earlier, the in-process child process message manager and any content process
child process message managers received the push event. This is because
broadcastAsyncMessage is used, but on e10s we want ServiceWorkers to run in the
child process, so the push should only be dispatched to it. This patch
introduces a list of child process listeners in the PushService (running on the
parent). PushServiceChildPreload sends a message to the PushService iff it is
running in a child process. If there are non-zero child listeners, the
PushService will send a message to all of them, otherwise it will fall back to
broadcastAsyncMessage.

We currently do not add support for precise targeting of child processes. This
is because until Bug 1182117 is fixed, all child process ServiceWorkerManagers
maintain all the service worker registrations internally. Yes this is a bug,
but that is the way things are right now. This makes it impossible to
distinguish which child should handle the notification for a given origin.
Considering we don't ship multi-process e10s, I would like to land this right
now.

When Bug 1182117 is fixed, we can remove this code since the
ServiceWorkerManager will manage registrations in the parent, and it will know
which child process is running which ServiceWorker.

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

You leak stuff in _childListeners. 
Looks like we've added "child-process-shutdown" (CHILD_PROCESS_SHUTDOWN_MESSAGE)
to notify process message manager parents of the child process shutting down.
So you want to listen for that and remove the relevant mm from _childListeners.

Other option would be to observe ipc:content-shutdown notification, but that seems to be harder
to use in this case.

Comment 3

[Nikhil Marathe [:nsm] (No longer reading bugmail, please needinfo?)]

Attachment: patch

removes child listeners.

Comment 4

[Nikhil Marathe [:nsm] (No longer reading bugmail, please needinfo?)]

url:        https://hg.mozilla.org/integration/mozilla-inbound/rev/b8a39e65c778d7c6a6c213e46e5655207f51bded
changeset:  b8a39e65c778d7c6a6c213e46e5655207f51bded
user:       Nikhil Marathe <[e-mail]>
date:       Thu Jul 30 20:00:21 2015 -0700
description:
Bug 1190661 - Send push only to child processes when in e10s mode. r=smaug

Earlier, the in-process child process message manager and any content process
child process message managers received the push event. This is because
broadcastAsyncMessage is used, but on e10s we want ServiceWorkers to run in the
child process, so the push should only be dispatched to it. This patch
introduces a list of child process listeners in the PushService (running on the
parent). PushServiceChildPreload sends a message to the PushService iff it is
running in a child process. If there are non-zero child listeners, the
PushService will send a message to all of them, otherwise it will fall back to
broadcastAsyncMessage.

We currently do not add support for precise targeting of child processes. This
is because until Bug 1182117 is fixed, all child process ServiceWorkerManagers
maintain all the service worker registrations internally. Yes this is a bug,
but that is the way things are right now. This makes it impossible to
distinguish which child should handle the notification for a given origin.
Considering we don't ship multi-process e10s, I would like to land this right
now.

When Bug 1182117 is fixed, we can remove this code since the
ServiceWorkerManager will manage registrations in the parent, and it will know
which child process is running which ServiceWorker.

Comment 5

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/mozilla-central/rev/b8a39e65c778