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LibWeb+WebWorker: Implement a first cut of post_message for Workers

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This implementation completely ignores MessagePorts, and manually plumbs
data through LocalSockets.
This commit is contained in:
Andrew Kaster 2023-11-22 09:57:22 -07:00 committed by Andreas Kling
parent 05ec93e276
commit 1602663b9e
Notes: sideshowbarker 2024-07-17 03:16:02 +09:00 
Author: https://github.com/ADKaster
Commit: https://github.com/SerenityOS/serenity/commit/1602663b9e
Pull-request: https://github.com/SerenityOS/serenity/pull/22021
15 changed files with 225 additions and 29 deletions
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4
Base/res/html/misc/worker.js
View File

@ -1,10 +1,10 @@
onmessage = evt => {
console.log("In Worker - Got message:", JSON.stringify(evt.data));
postMessage(JSON.stringify(evt.data));
postMessage(evt.data, null);
};
console.log("In Worker - Loaded", this);
console.log("Keys: ", JSON.stringify(Object.keys(this)));
postMessage("loaded");
postMessage("loaded", null);

2
Base/res/html/misc/worker_parent.html
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@ -21,7 +21,7 @@
.getElementById("btn_hello")
.addEventListener("click", function() {
console.log("Sending Message");
work.postMessage("Hey buddy!");
work.postMessage({ "msg": "Hey buddy!" });
});
});
</script>

3
Tests/LibWeb/Text/expected/Worker/Worker-echo.txt Normal file
View File

@ -0,0 +1,3 @@
Got message from worker: "loaded"
Got message from worker: {"msg":"marco"}
DONE

18
Tests/LibWeb/Text/input/Worker/Worker-echo.html Normal file
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@ -0,0 +1,18 @@
<script src="../include.js"></script>
<script>
asyncTest((done) => {
let work = new Worker("worker.js");
let count = 0;
work.onmessage = (evt) => {
println("Got message from worker: " + JSON.stringify(evt.data));
count++;
work.postMessage({"msg": "marco"});
if (count === 2) {
println("DONE");
work.onmessage = null;
work.terminate();
done();
}
};
});
</script>

4
Tests/LibWeb/Text/input/Worker/worker.js Normal file
View File

@ -0,0 +1,4 @@
onmessage = evt => {
postMessage(evt.data, null);
};
postMessage("loaded", null);

74
Userland/Libraries/LibWeb/HTML/Worker.cpp
View File

@ -9,6 +9,7 @@
#include <LibJS/Runtime/Realm.h>
#include <LibWeb/Bindings/MainThreadVM.h>
#include <LibWeb/HTML/Scripting/Environments.h>
#include <LibWeb/HTML/Scripting/TemporaryExecutionContext.h>
#include <LibWeb/HTML/Worker.h>
#include <LibWeb/HTML/WorkerDebugConsoleClient.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
@ -109,6 +110,54 @@ void Worker::run_a_worker(AK::URL& url, EnvironmentSettingsObject& outside_setti
// Note: This spawns a new process to act as the 'agent' for the worker.
m_agent = heap().allocate_without_realm<WorkerAgent>(url, options);
auto& socket = m_agent->socket();
// FIXME: Hide this logic in MessagePort
socket.set_notifications_enabled(true);
socket.on_ready_to_read = [this] {
auto& socket = this->m_agent->socket();
auto& vm = this->vm();
auto& realm = this->realm();
auto num_bytes_ready = MUST(socket.pending_bytes());
switch (m_outside_port_state) {
case PortState::Header: {
if (num_bytes_ready < 8)
break;
auto const magic = MUST(socket.read_value<u32>());
if (magic != 0xDEADBEEF) {
m_outside_port_state = PortState::Error;
break;
}
m_outside_port_incoming_message_size = MUST(socket.read_value<u32>());
num_bytes_ready -= 8;
m_outside_port_state = PortState::Data;
}
[[fallthrough]];
case PortState::Data: {
if (num_bytes_ready < m_outside_port_incoming_message_size)
break;
SerializationRecord rec; // FIXME: Keep in class scope
rec.resize(m_outside_port_incoming_message_size / sizeof(u32));
MUST(socket.read_until_filled(to_bytes(rec.span())));
TemporaryExecutionContext cxt(relevant_settings_object(*this));
VERIFY(&realm == vm.current_realm());
MessageEventInit event_init {};
event_init.data = MUST(structured_deserialize(vm, rec, realm, {}));
// FIXME: Fill in the rest of the info from MessagePort
this->dispatch_event(MessageEvent::create(realm, EventNames::message, event_init));
m_outside_port_state = PortState::Header;
break;
}
case PortState::Error:
VERIFY_NOT_REACHED();
break;
}
};
}
// https://html.spec.whatwg.org/multipage/workers.html#dom-worker-terminate
@ -120,16 +169,29 @@ WebIDL::ExceptionOr<void> Worker::terminate()
}
// https://html.spec.whatwg.org/multipage/workers.html#dom-worker-postmessage
void Worker::post_message(JS::Value message, JS::Value)
WebIDL::ExceptionOr<void> Worker::post_message(JS::Value message, JS::Value)
{
dbgln_if(WEB_WORKER_DEBUG, "WebWorker: Post Message: {}", message.to_string_without_side_effects());
// 1. Let targetPort be the port with which this is entangled, if any; otherwise let it be null.
auto& target_port = m_outside_port;
// FIXME: 1. Let targetPort be the port with which this is entangled, if any; otherwise let it be null.
// FIXME: 2. Let options be «[ "transfer" → transfer ]».
// FIXME: 3. Run the message port post message steps providing this, targetPort, message and options.
// 2. Let options be «[ "transfer" → transfer ]».
// 3. Run the message port post message steps providing this, targetPort, message and options.
target_port->post_message(message);
auto& realm = this->realm();
auto& vm = this->vm();
// FIXME: Use the with-transfer variant, which should(?) prepend the magic + size at the front
auto data = TRY(structured_serialize(vm, message));
Array<u32, 2> header = { 0xDEADBEEF, static_cast<u32>(data.size() * sizeof(u32)) };
if (auto const err = m_agent->socket().write_until_depleted(to_readonly_bytes(header.span())); err.is_error())
return WebIDL::DataCloneError::create(realm, TRY_OR_THROW_OOM(vm, String::formatted("{}", err.error())));
if (auto const err = m_agent->socket().write_until_depleted(to_readonly_bytes(data.span())); err.is_error())
return WebIDL::DataCloneError::create(realm, TRY_OR_THROW_OOM(vm, String::formatted("{}", err.error())));
return {};
}
#undef __ENUMERATE

9
Userland/Libraries/LibWeb/HTML/Worker.h
View File

@ -41,7 +41,7 @@ public:
WebIDL::ExceptionOr<void> terminate();
void post_message(JS::Value message, JS::Value transfer);
WebIDL::ExceptionOr<void> post_message(JS::Value message, JS::Value transfer);
virtual ~Worker() = default;
@ -66,6 +66,13 @@ private:
JS::GCPtr<DOM::Document> m_document;
JS::GCPtr<MessagePort> m_outside_port;
// FIXME: Move tihs state into the message port (and actually use it :) )
enum class PortState : u8 {
Header,
Data,
Error,
} m_outside_port_state { PortState::Header };
size_t m_outside_port_incoming_message_size { 0 };
JS::GCPtr<WorkerAgent> m_agent;

3
Userland/Libraries/LibWeb/HTML/WorkerAgent.cpp
View File

@ -109,7 +109,8 @@ WorkerAgent::WorkerAgent(AK::URL url, WorkerOptions const& options)
int fds[2] = {};
MUST(Core::System::socketpair(AF_LOCAL, SOCK_STREAM, 0, fds));
m_message_port_fd = fds[0];
m_socket = MUST(Core::BufferedLocalSocket::create(MUST(Core::LocalSocket::adopt_fd(fds[0]))));
m_worker_ipc->async_start_dedicated_worker(m_url, options.type, options.credentials, options.name, fds[1]);
}

9
Userland/Libraries/LibWeb/HTML/WorkerAgent.h
View File

@ -6,11 +6,10 @@
#pragma once
#include <AK/RefCounted.h>
#include <LibCore/Socket.h>
#include <LibWeb/Forward.h>
#include <LibWeb/HTML/MessageEvent.h>
#include <LibWeb/HTML/MessagePort.h>
#include <LibWeb/HTML/Scripting/ClassicScript.h>
#include <LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h>
#include <LibWeb/HTML/Window.h>
#include <LibWeb/Worker/WebWorkerClient.h>
@ -31,12 +30,14 @@ struct WorkerAgent : JS::Cell {
RefPtr<Web::HTML::WebWorkerClient> m_worker_ipc;
Core::BufferedLocalSocket& socket() const { return *m_socket; }
private:
WorkerOptions m_worker_options;
AK::URL m_url;
// TODO: associate with MessagePorts?
int m_message_port_fd;
// FIXME: associate with MessagePorts
OwnPtr<Core::BufferedLocalSocket> m_socket;
};
}

73
Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.cpp
View File

@ -4,14 +4,17 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Array.h>
#include <AK/Vector.h>
#include <LibWeb/Bindings/DedicatedWorkerExposedInterfaces.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/WorkerGlobalScopePrototype.h>
#include <LibWeb/Forward.h>
#include <LibWeb/HTML/EventHandler.h>
#include <LibWeb/HTML/EventNames.h>
#include <LibWeb/HTML/MessageEvent.h>
#include <LibWeb/HTML/Scripting/TemporaryExecutionContext.h>
#include <LibWeb/HTML/StructuredSerialize.h>
#include <LibWeb/HTML/WorkerGlobalScope.h>
#include <LibWeb/HTML/WorkerLocation.h>
#include <LibWeb/HTML/WorkerNavigator.h>
@ -52,6 +55,55 @@ void WorkerGlobalScope::visit_edges(Cell::Visitor& visitor)
visitor.visit(m_navigator);
}
void WorkerGlobalScope::set_outside_port(NonnullOwnPtr<Core::BufferedLocalSocket> port)
{
m_outside_port = move(port);
// FIXME: Hide this logic in MessagePort
m_outside_port->set_notifications_enabled(true);
m_outside_port->on_ready_to_read = [this] {
auto& vm = this->vm();
auto& realm = this->realm();
auto num_bytes_ready = MUST(m_outside_port->pending_bytes());
switch (m_outside_port_state) {
case PortState::Header: {
if (num_bytes_ready < 8)
break;
auto const magic = MUST(m_outside_port->read_value<u32>());
if (magic != 0xDEADBEEF) {
m_outside_port_state = PortState::Error;
break;
}
m_outside_port_incoming_message_size = MUST(m_outside_port->read_value<u32>());
num_bytes_ready -= 8;
m_outside_port_state = PortState::Data;
}
[[fallthrough]];
case PortState::Data: {
if (num_bytes_ready < m_outside_port_incoming_message_size)
break;
SerializationRecord rec; // FIXME: Keep in class scope
rec.resize(m_outside_port_incoming_message_size / sizeof(u32));
MUST(m_outside_port->read_until_filled(to_bytes(rec.span())));
TemporaryExecutionContext cxt(relevant_settings_object(*this));
MessageEventInit event_init {};
event_init.data = MUST(structured_deserialize(vm, rec, realm, {}));
// FIXME: Fill in the rest of the info from MessagePort
this->dispatch_event(MessageEvent::create(realm, EventNames::message, event_init));
m_outside_port_state = PortState::Header;
break;
}
case PortState::Error:
VERIFY_NOT_REACHED();
break;
}
};
}
// https://html.spec.whatwg.org/multipage/workers.html#importing-scripts-and-libraries
WebIDL::ExceptionOr<void> WorkerGlobalScope::import_scripts(Vector<String> urls)
{
@ -94,6 +146,25 @@ JS::NonnullGCPtr<WorkerNavigator> WorkerGlobalScope::navigator() const
return *m_navigator;
}
WebIDL::ExceptionOr<void> WorkerGlobalScope::post_message(JS::Value message, JS::Value)
{
auto& realm = this->realm();
auto& vm = this->vm();
// FIXME: Use the with-transfer variant, which should(?) prepend the magic + size at the front
auto data = TRY(structured_serialize(vm, message));
Array<u32, 2> header = { 0xDEADBEEF, static_cast<u32>(data.size() * sizeof(u32)) };
if (auto const err = m_outside_port->write_until_depleted(to_readonly_bytes(header.span())); err.is_error())
return WebIDL::DataCloneError::create(realm, TRY_OR_THROW_OOM(vm, String::formatted("{}", err.error())));
if (auto const err = m_outside_port->write_until_depleted(to_readonly_bytes(data.span())); err.is_error())
return WebIDL::DataCloneError::create(realm, TRY_OR_THROW_OOM(vm, String::formatted("{}", err.error())));
return {};
}
#undef __ENUMERATE
#define __ENUMERATE(attribute_name, event_name) \
void WorkerGlobalScope::set_##attribute_name(WebIDL::CallbackType* value) \

30
Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.h
View File

@ -9,6 +9,7 @@
#include <AK/Optional.h>
#include <AK/RefCounted.h>
#include <AK/URL.h>
#include <LibCore/Socket.h>
#include <LibWeb/DOM/EventTarget.h>
#include <LibWeb/Forward.h>
#include <LibWeb/HTML/WindowOrWorkerGlobalScope.h>
@ -16,13 +17,16 @@
#include <LibWeb/HTML/WorkerNavigator.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
#define ENUMERATE_WORKER_GLOBAL_SCOPE_EVENT_HANDLERS(E) \
E(onerror, HTML::EventNames::error) \
E(onlanguagechange, HTML::EventNames::languagechange) \
E(ononline, HTML::EventNames::online) \
E(onoffline, HTML::EventNames::offline) \
E(onrejectionhandled, HTML::EventNames::rejectionhandled) \
E(onunhandledrejection, HTML::EventNames::unhandledrejection)
// FIXME: message/messageerror belong on subclasses only
#define ENUMERATE_WORKER_GLOBAL_SCOPE_EVENT_HANDLERS(E) \
E(onerror, HTML::EventNames::error) \
E(onlanguagechange, HTML::EventNames::languagechange) \
E(ononline, HTML::EventNames::online) \
E(onoffline, HTML::EventNames::offline) \
E(onrejectionhandled, HTML::EventNames::rejectionhandled) \
E(onunhandledrejection, HTML::EventNames::unhandledrejection) \
E(onmessage, HTML::EventNames::message) \
E(onmessageerror, HTML::EventNames::messageerror)
namespace Web::HTML {
@ -69,6 +73,8 @@ public:
ENUMERATE_WORKER_GLOBAL_SCOPE_EVENT_HANDLERS(__ENUMERATE)
#undef __ENUMERATE
WebIDL::ExceptionOr<void> post_message(JS::Value message, JS::Value transfer);
// Non-IDL public methods
AK::URL const& url() const { return m_url.value(); }
@ -78,6 +84,8 @@ public:
// this is not problematic as it cannot be observed from script.
void set_location(JS::NonnullGCPtr<WorkerLocation> loc) { m_location = move(loc); }
void set_outside_port(NonnullOwnPtr<Core::BufferedLocalSocket> port);
void initialize_web_interfaces(Badge<WorkerEnvironmentSettingsObject>);
Web::Page* page() { return &m_page; }
@ -91,6 +99,14 @@ private:
JS::GCPtr<WorkerLocation> m_location;
JS::GCPtr<WorkerNavigator> m_navigator;
OwnPtr<Core::BufferedLocalSocket> m_outside_port;
enum class PortState : u8 {
Header,
Data,
Error,
} m_outside_port_state { PortState::Header };
size_t m_outside_port_incoming_message_size { 0 };
// FIXME: Add all these internal slots
// https://html.spec.whatwg.org/multipage/workers.html#concept-WorkerGlobalScope-owner-set

5
Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.idl
View File

@ -18,6 +18,11 @@ interface WorkerGlobalScope : EventTarget {
attribute EventHandler ononline;
attribute EventHandler onrejectionhandled;
attribute EventHandler onunhandledrejection;
// FIXME: This belongs on the subclasses of WorkerGlobalScope
undefined postMessage(any message, any transfer);
attribute EventHandler onmessage;
attribute EventHandler onmessageerror;
};
WorkerGlobalScope includes WindowOrWorkerGlobalScope;

4
Userland/Services/WebWorker/ConnectionFromClient.cpp
View File

@ -52,9 +52,9 @@ Web::Page const& ConnectionFromClient::page() const
return m_page_host->page();
}
void ConnectionFromClient::start_dedicated_worker(AK::URL const& url, String const& type, String const&, String const&, IPC::File const&)
void ConnectionFromClient::start_dedicated_worker(AK::URL const& url, String const& type, String const&, String const&, IPC::File const& implicit_port)
{
m_worker_host = make_ref_counted<DedicatedWorkerHost>(page(), url, type);
m_worker_host = make_ref_counted<DedicatedWorkerHost>(page(), url, type, implicit_port.take_fd());
m_worker_host->run();
}

12
Userland/Services/WebWorker/DedicatedWorkerHost.cpp
View File

@ -17,14 +17,18 @@
namespace WebWorker {
DedicatedWorkerHost::DedicatedWorkerHost(Web::Page& page, AK::URL url, String type)
DedicatedWorkerHost::DedicatedWorkerHost(Web::Page& page, AK::URL url, String type, int outside_port)
: m_page(page)
, m_url(move(url))
, m_type(move(type))
, m_outside_port(outside_port)
{
}
DedicatedWorkerHost::~DedicatedWorkerHost() = default;
DedicatedWorkerHost::~DedicatedWorkerHost()
{
::close(m_outside_port);
}
// https://html.spec.whatwg.org/multipage/workers.html#run-a-worker
// FIXME: Extract out into a helper for both shared and dedicated workers
@ -128,7 +132,7 @@ void DedicatedWorkerHost::run()
};
auto perform_fetch = Web::HTML::create_perform_the_fetch_hook(inner_settings->heap(), move(perform_fetch_function));
auto on_complete_function = [inner_settings, worker_global_scope](JS::GCPtr<Web::HTML::Script> script) {
auto on_complete_function = [inner_settings, worker_global_scope, outside_port = m_outside_port](JS::GCPtr<Web::HTML::Script> script) {
auto& realm = inner_settings->realm();
// 1. If script is null or if script's error to rethrow is non-null, then:
if (!script || !script->error_to_rethrow().is_null()) {
@ -147,6 +151,8 @@ void DedicatedWorkerHost::run()
// FIXME: 3. Let inside port be a new MessagePort object in inside settings's Realm.
// FIXME: 4. Associate inside port with worker global scope.
// FIXME: 5. Entangle outside port and inside port.
// This is a hack, move to a real MessagePort object per above FIXMEs.
worker_global_scope->set_outside_port(MUST(Core::BufferedLocalSocket::create(MUST(Core::LocalSocket::adopt_fd(outside_port)))));
// 6. Create a new WorkerLocation object and associate it with worker global scope.
worker_global_scope->set_location(realm.heap().allocate<Web::HTML::WorkerLocation>(realm, *worker_global_scope));

4
Userland/Services/WebWorker/DedicatedWorkerHost.h
View File

@ -15,7 +15,7 @@ namespace WebWorker {
class DedicatedWorkerHost : public RefCounted<DedicatedWorkerHost> {
public:
explicit DedicatedWorkerHost(Web::Page&, AK::URL url, String type);
explicit DedicatedWorkerHost(Web::Page&, AK::URL url, String type, int outside_port);
~DedicatedWorkerHost();
void run();
@ -26,6 +26,8 @@ private:
AK::URL m_url;
String m_type;
int m_outside_port { -1 };
};
}