Some WebDriver hooks will need to inform the client that execution has
completed, but without any knowledge of what endpoint was running. Since
there can only ever be a single WebDriver endpoint executing at once, we
can replace the completion callbacks with a single callback.
We currently spin the event loop to wait for the specified element to
become available. As we've seen with other endpoints, this can result
in dead locks if another web component also spins the event loop.
This patch makes the locator implementations asynchronous.
It's currently possible for window size/position updates to hang, as the
underlying IPCs are synchronous. This updates the WebDriver endpoint to
be async, to unblock the WebContent process while the update is ongoing.
The UI process is now responsible for informing WebContent when the
update is complete.
There was a timing issue here where WebDriver would dismiss a dialog,
and then invoke another endpoint before the dialog was actually closed.
This is because the dismissal first has to hop over to the UI process to
close the graphical dialog, which then asynchronously informs WebContent
of the result. It's not until WebContent receives that result that the
dialog is considered closed, thus those subsequent endpoints would abort
due a dialog being "open".
We now wait for dialogs to be fully closed before returning from the
dismissal endpoints.
Similar to commit c2cf65adac, we should
avoid spinning the event loop from the WebContent-side of the WebDriver
connection. This can result in deadlocks if another component in LibWeb
also spins the event loop.
The AO to await navigations has two event loop spinners - waiting for
the navigation to complete and for the document to reach the target
readiness state. We now use NavigationObserver and DocumentObserver to
be notified when these conditions are met. And we use the same async IPC
mechanism as script execution to notify the WebDriver process when all
conditions are met (or timed out).
This abstraction will help us to support multiple IPC transport
mechanisms going forward. For now, we only have a TransportSocket that
implements the same behavior we previously had, using Unix Sockets for
IPC.
This reverts commit 556a0936dd.
This was causing a large slow down in WPT, and a crash on macOS during
session shutdown when running WebDriver manually.
Similar to script execution, this spins the WebDriver process until the
action is complete (rather than spinning the WebContent process, which
we've seen result in deadlocks).
We currently spin the platform event loop while awaiting scripts to
complete. This causes WebContent to hang if another component is also
spinning the event loop. The particular example that instigated this
patch was the navigable's navigation loop (which spins until the fetch
process is complete), triggered by a form submission to an iframe.
So instead of spinning, we now return immediately from the script
executors, after setting up listeners for either the script's promise to
be resolved or for a timeout. The HTTP request to WebDriver must finish
synchronously though, so now the WebDriver process spins its event loop
until WebContent signals that the script completed. This should be ok -
the WebDriver process isn't expected to be doing anything else in the
meantime.
Also, as a consequence of these changes, we now actually handle time
outs. We were previously creating the timeout timer, but not starting
it.
First, this moves the WebDriver socket to the /tmp/websocket/ directory,
as WebDriver now creates multiple sockets per session. Those sockets are
now created with Core::LocalServer rather than manually setting up the
listening sockets (this was an existing FIXME which resolved some issues
I was hitting with creating a second listening socket).
WebDriver passes both socket paths to Browser via command line. Browser
continues to connect itself via one socket path, then forwards the other
socket path to the WebContent process created by the OOPWV. WebContent
then connects to WebDriver over this path.
WebContent will temporarily set the navigator.webdriver flag to true
after connecting to WebDriver. This will soon be moved to its own IPC to
be sent by WebDriver.
