mirror of
https://github.com/LadybirdBrowser/ladybird.git
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1602663b9e
This implementation completely ignores MessagePorts, and manually plumbs data through LocalSockets.
119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
/*
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* Copyright (c) 2023, Andrew Kaster <akaster@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/LexicalPath.h>
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#include <LibCore/Socket.h>
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#include <LibCore/System.h>
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#include <LibWeb/HTML/WorkerAgent.h>
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#include <LibWeb/Worker/WebWorkerClient.h>
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// FIXME: Deduplicate this code with ladybird!!
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#ifndef AK_OS_SERENITY
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namespace {
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ErrorOr<String> application_directory()
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{
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auto current_executable_path = TRY(Core::System::current_executable_path());
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auto dirname = LexicalPath::dirname(current_executable_path.to_deprecated_string());
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return String::from_deprecated_string(dirname);
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}
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ErrorOr<Vector<String>> get_paths_for_helper_process(StringView process_name)
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{
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auto application_path = TRY(application_directory());
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Vector<String> paths;
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TRY(paths.try_append(TRY(String::formatted("{}/{}", application_path, process_name))));
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TRY(paths.try_append(TRY(String::formatted("./{}", process_name))));
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// NOTE: Add platform-specific paths here
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return paths;
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}
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ErrorOr<NonnullRefPtr<Web::HTML::WebWorkerClient>> launch_web_worker_process(ReadonlySpan<String> candidate_web_content_paths)
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{
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int socket_fds[2] {};
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TRY(Core::System::socketpair(AF_LOCAL, SOCK_STREAM, 0, socket_fds));
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int ui_fd = socket_fds[0];
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int wc_fd = socket_fds[1];
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int fd_passing_socket_fds[2] {};
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TRY(Core::System::socketpair(AF_LOCAL, SOCK_STREAM, 0, fd_passing_socket_fds));
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int ui_fd_passing_fd = fd_passing_socket_fds[0];
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int wc_fd_passing_fd = fd_passing_socket_fds[1];
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if (auto child_pid = TRY(Core::System::fork()); child_pid == 0) {
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TRY(Core::System::close(ui_fd_passing_fd));
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TRY(Core::System::close(ui_fd));
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auto takeover_string = TRY(String::formatted("WebWorker:{}", wc_fd));
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TRY(Core::System::setenv("SOCKET_TAKEOVER"sv, takeover_string, true));
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auto webcontent_fd_passing_socket_string = TRY(String::number(wc_fd_passing_fd));
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ErrorOr<void> result;
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for (auto const& path : candidate_web_content_paths) {
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if (Core::System::access(path, X_OK).is_error())
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continue;
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auto arguments = Vector {
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path.bytes_as_string_view(),
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"--fd-passing-socket"sv,
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webcontent_fd_passing_socket_string
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};
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result = Core::System::exec(arguments[0], arguments.span(), Core::System::SearchInPath::Yes);
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if (!result.is_error())
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break;
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}
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if (result.is_error())
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warnln("Could not launch any of {}: {}", candidate_web_content_paths, result.error());
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VERIFY_NOT_REACHED();
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}
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TRY(Core::System::close(wc_fd_passing_fd));
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TRY(Core::System::close(wc_fd));
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auto socket = TRY(Core::LocalSocket::adopt_fd(ui_fd));
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TRY(socket->set_blocking(true));
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auto new_client = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) Web::HTML::WebWorkerClient(move(socket))));
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new_client->set_fd_passing_socket(TRY(Core::LocalSocket::adopt_fd(ui_fd_passing_fd)));
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return new_client;
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}
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}
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#endif
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namespace Web::HTML {
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JS_DEFINE_ALLOCATOR(WorkerAgent);
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WorkerAgent::WorkerAgent(AK::URL url, WorkerOptions const& options)
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: m_worker_options(options)
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, m_url(move(url))
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{
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#ifndef AK_OS_SERENITY
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// FIXME: Add factory function
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auto paths = MUST(get_paths_for_helper_process("WebWorker"sv));
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m_worker_ipc = MUST(launch_web_worker_process(paths));
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#else
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m_worker_ipc = MUST(Web::HTML::WebWorkerClient::try_create());
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#endif
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int fds[2] = {};
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MUST(Core::System::socketpair(AF_LOCAL, SOCK_STREAM, 0, fds));
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m_socket = MUST(Core::BufferedLocalSocket::create(MUST(Core::LocalSocket::adopt_fd(fds[0]))));
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m_worker_ipc->async_start_dedicated_worker(m_url, options.type, options.credentials, options.name, fds[1]);
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}
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}
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