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LibWeb: Add WebSocket task source

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The WebSocket spec tells us to queue tasks instead of firing events
synchronously at WebSockets, so this commit does exactly that.

The way we've implemented web sockets means that the work is spread
across multiple libraries and even processes, which is why it doesn't
look like the spec verbatim.
This commit is contained in:
Andreas Kling 2024-11-15 18:56:16 +01:00 committed by Andreas Kling
parent 7c2601f315
commit 87fc7028d7
Notes: github-actions[bot] 2024-11-15 22:19:08 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/87fc7028d7c
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2369
2 changed files with 53 additions and 37 deletions
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3
Libraries/LibWeb/HTML/EventLoop/Task.h
View file

@ -68,6 +68,9 @@ public:
// https://w3c.github.io/IndexedDB/#database-access-task-source
DatabaseAccess,
// https://websockets.spec.whatwg.org/#websocket-task-source
WebSocket,
// !!! IMPORTANT: Keep this field last!
// This serves as the base value of all unique task sources.
// Some elements, such as the HTMLMediaElement, must have a unique task source per instance.

13
Libraries/LibWeb/WebSockets/WebSocket.cpp
View file

@ -247,21 +247,29 @@ WebIDL::ExceptionOr<void> WebSocket::send(Variant<GC::Root<WebIDL::BufferSource>
// https://websockets.spec.whatwg.org/#feedback-from-the-protocol
void WebSocket::on_open()
{
// When the WebSocket connection is established, the user agent must queue a task to run these steps:
HTML::queue_a_task(HTML::Task::Source::WebSocket, nullptr, nullptr, GC::create_function(heap(), [this] {
// 1. Change the readyState attribute's value to OPEN (1).
// 2. Change the extensions attribute's value to the extensions in use, if it is not the null value. [WSP]
// 3. Change the protocol attribute's value to the subprotocol in use, if it is not the null value. [WSP]
dispatch_event(DOM::Event::create(realm(), HTML::EventNames::open));
}));
}
// https://websockets.spec.whatwg.org/#feedback-from-the-protocol
void WebSocket::on_error()
{
// When the WebSocket connection is closed, possibly cleanly, the user agent must queue a task to run the following substeps:
HTML::queue_a_task(HTML::Task::Source::WebSocket, nullptr, nullptr, GC::create_function(heap(), [this] {
dispatch_event(DOM::Event::create(realm(), HTML::EventNames::error));
}));
}
// https://websockets.spec.whatwg.org/#feedback-from-the-protocol
void WebSocket::on_close(u16 code, String reason, bool was_clean)
{
// When the WebSocket connection is closed, possibly cleanly, the user agent must queue a task to run the following substeps:
HTML::queue_a_task(HTML::Task::Source::WebSocket, nullptr, nullptr, GC::create_function(heap(), [this, code, reason = move(reason), was_clean] {
// 1. Change the readyState attribute's value to CLOSED. This is handled by the Protocol's WebSocket
// 2. If [needed], fire an event named error at the WebSocket object. This is handled by the Protocol's WebSocket
HTML::CloseEventInit event_init {};
@ -269,6 +277,7 @@ void WebSocket::on_close(u16 code, String reason, bool was_clean)
event_init.code = code;
event_init.reason = reason;
dispatch_event(HTML::CloseEvent::create(realm(), HTML::EventNames::close, event_init));
}));
}
// https://websockets.spec.whatwg.org/#feedback-from-the-protocol
@ -276,6 +285,9 @@ void WebSocket::on_message(ByteBuffer message, bool is_text)
{
if (m_websocket->ready_state() != Requests::WebSocket::ReadyState::Open)
return;
// When a WebSocket message has been received with type type and data data, the user agent must queue a task to follow these steps:
HTML::queue_a_task(HTML::Task::Source::WebSocket, nullptr, nullptr, GC::create_function(heap(), [this, message = move(message), is_text] {
if (is_text) {
auto text_message = ByteString(ReadonlyBytes(message));
HTML::MessageEventInit event_init;
@ -303,6 +315,7 @@ void WebSocket::on_message(ByteBuffer message, bool is_text)
dbgln("Unsupported WebSocket message type {}", m_binary_type);
TODO();
}));
}
#undef __ENUMERATE