Ladybird: Render web content in a separate process :^)

This patch brings over the WebContent process over from SerenityOS to Ladybird, along with a new WebContentView widget that renders web content in a separate process. There's a lot of jank and FIXME material here, notably I had to re-add manually pumped Core::EventLoop instances on both sides, in order to get the IPC protocol running. This introduces a lot of latency and we should work towards replacing those loops with improved abstractions. The WebContent process is built separately here (not part of Lagom) and we provide our own main.cpp for it. Like everything, this can be better architected, it's just a starting point. :^)
2025-05-31 08:58:11 +00:00 · 2022-10-05 15:23:41 +02:00 · 2022-10-05 15:23:41 +02:00 · 26a7ea0e0f
commit 26a7ea0e0f
parent 2451a447f5
14 changed files with 1313 additions and 795 deletions
--- a/Ladybird/WebContent/main.cpp
+++ b/Ladybird/WebContent/main.cpp
@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#define AK_DONT_REPLACE_STD
+
+#include "../EventLoopPluginQt.h"
+#include "../FontPluginQt.h"
+#include "../ImageCodecPluginLadybird.h"
+#include "../RequestManagerQt.h"
+#include "../Utilities.h"
+#include "../WebSocketClientManagerLadybird.h"
+#include <AK/LexicalPath.h>
+#include <LibCore/EventLoop.h>
+#include <LibCore/File.h>
+#include <LibCore/LocalServer.h>
+#include <LibCore/System.h>
+#include <LibIPC/SingleServer.h>
+#include <LibMain/Main.h>
+#include <LibWeb/Loader/ContentFilter.h>
+#include <LibWeb/Loader/FrameLoader.h>
+#include <LibWeb/Loader/ResourceLoader.h>
+#include <LibWeb/WebSockets/WebSocket.h>
+#include <QGuiApplication>
+#include <QSocketNotifier>
+#include <QTimer>
+#include <WebContent/ConnectionFromClient.h>
+
+static ErrorOr<void> load_content_filters();
+
+extern String s_serenity_resource_root;
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    // NOTE: This is only used for the Core::Socket inside the IPC connection.
+    // FIXME: Refactor things so we can get rid of this somehow.
+    Core::EventLoop event_loop;
+
+    platform_init();
+
+    QGuiApplication app(arguments.argc, arguments.argv);
+
+    Web::Platform::EventLoopPlugin::install(*new Ladybird::EventLoopPluginQt);
+    Web::Platform::ImageCodecPlugin::install(*new Ladybird::ImageCodecPluginLadybird);
+
+    Web::ResourceLoader::initialize(RequestManagerQt::create());
+    Web::WebSockets::WebSocketClientManager::initialize(Ladybird::WebSocketClientManagerLadybird::create());
+
+    Web::FrameLoader::set_default_favicon_path(String::formatted("{}/res/icons/16x16/app-browser.png", s_serenity_resource_root));
+
+    Web::Platform::FontPlugin::install(*new Ladybird::FontPluginQt);
+
+    Web::FrameLoader::set_error_page_url(String::formatted("file://{}/res/html/error.html", s_serenity_resource_root));
+
+    auto maybe_content_filter_error = load_content_filters();
+    if (maybe_content_filter_error.is_error())
+        dbgln("Failed to load content filters: {}", maybe_content_filter_error.error());
+
+    auto client = TRY(IPC::take_over_accepted_client_from_system_server<WebContent::ConnectionFromClient>());
+
+    auto* fd_passing_socket_spec = getenv("FD_PASSING_SOCKET");
+    VERIFY(fd_passing_socket_spec);
+    auto fd_passing_socket_spec_string = String(fd_passing_socket_spec);
+    auto maybe_fd_passing_socket = fd_passing_socket_spec_string.to_int();
+    VERIFY(maybe_fd_passing_socket.has_value());
+
+    client->set_fd_passing_socket(TRY(Core::Stream::LocalSocket::adopt_fd(maybe_fd_passing_socket.value())));
+
+    QSocketNotifier notifier(client->socket().fd().value(), QSocketNotifier::Type::Read);
+    QObject::connect(&notifier, &QSocketNotifier::activated, [&] {
+        client->socket().notifier()->on_ready_to_read();
+    });
+
+    struct DeferredInvokerQt final : IPC::DeferredInvoker {
+        virtual ~DeferredInvokerQt() = default;
+        virtual void schedule(Function<void()> callback) override
+        {
+            QTimer::singleShot(0, move(callback));
+        }
+    };
+
+    client->set_deferred_invoker(make<DeferredInvokerQt>());
+
+    return app.exec();
+}
+
+static ErrorOr<void> load_content_filters()
+{
+    auto file_or_error = Core::Stream::File::open(String::formatted("{}/home/anon/.config/BrowserContentFilters.txt", s_serenity_resource_root), Core::Stream::OpenMode::Read);
+    if (file_or_error.is_error())
+        file_or_error = Core::Stream::File::open(String::formatted("{}/res/ladybird/BrowserContentFilters.txt", s_serenity_resource_root), Core::Stream::OpenMode::Read);
+    if (file_or_error.is_error())
+        return file_or_error.release_error();
+    auto file = file_or_error.release_value();
+    auto ad_filter_list = TRY(Core::Stream::BufferedFile::create(move(file)));
+    auto buffer = TRY(ByteBuffer::create_uninitialized(4096));
+    while (TRY(ad_filter_list->can_read_line())) {
+        auto line = TRY(ad_filter_list->read_line(buffer));
+        if (!line.is_empty()) {
+            Web::ContentFilter::the().add_pattern(line);
+        }
+    }
+    return {};
+}