264 lines
8.3 KiB
C++
264 lines
8.3 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/message_loop/message_pump_libevent.h"
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#include <unistd.h>
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#include <memory>
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#include <utility>
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#include "base/bind.h"
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#include "base/bind_helpers.h"
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#include "base/files/file_util.h"
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#include "base/memory/ptr_util.h"
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#include "base/message_loop/message_loop.h"
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#include "base/posix/eintr_wrapper.h"
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#include "base/run_loop.h"
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#include "base/single_thread_task_runner.h"
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#include "base/synchronization/waitable_event.h"
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#include "base/synchronization/waitable_event_watcher.h"
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#include "base/test/gtest_util.h"
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#include "base/third_party/libevent/event.h"
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#include "base/threading/sequenced_task_runner_handle.h"
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#include "base/threading/thread.h"
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#include "base/threading/thread_task_runner_handle.h"
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#include "build/build_config.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace base {
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class MessagePumpLibeventTest : public testing::Test {
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protected:
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MessagePumpLibeventTest()
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: ui_loop_(new MessageLoop(MessageLoop::TYPE_UI)),
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io_thread_("MessagePumpLibeventTestIOThread") {}
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~MessagePumpLibeventTest() override = default;
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void SetUp() override {
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Thread::Options options(MessageLoop::TYPE_IO, 0);
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ASSERT_TRUE(io_thread_.StartWithOptions(options));
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ASSERT_EQ(MessageLoop::TYPE_IO, io_thread_.message_loop()->type());
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int ret = pipe(pipefds_);
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ASSERT_EQ(0, ret);
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}
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void TearDown() override {
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if (IGNORE_EINTR(close(pipefds_[0])) < 0)
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PLOG(ERROR) << "close";
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if (IGNORE_EINTR(close(pipefds_[1])) < 0)
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PLOG(ERROR) << "close";
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}
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void WaitUntilIoThreadStarted() {
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ASSERT_TRUE(io_thread_.WaitUntilThreadStarted());
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}
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scoped_refptr<SingleThreadTaskRunner> io_runner() const {
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return io_thread_.task_runner();
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}
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void OnLibeventNotification(
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MessagePumpLibevent* pump,
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MessagePumpLibevent::FdWatchController* controller) {
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pump->OnLibeventNotification(0, EV_WRITE | EV_READ, controller);
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}
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int pipefds_[2];
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std::unique_ptr<MessageLoop> ui_loop_;
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private:
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Thread io_thread_;
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};
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namespace {
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// Concrete implementation of MessagePumpLibevent::FdWatcher that does
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// nothing useful.
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class StupidWatcher : public MessagePumpLibevent::FdWatcher {
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public:
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~StupidWatcher() override = default;
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// base:MessagePumpLibevent::FdWatcher interface
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void OnFileCanReadWithoutBlocking(int fd) override {}
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void OnFileCanWriteWithoutBlocking(int fd) override {}
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};
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TEST_F(MessagePumpLibeventTest, QuitOutsideOfRun) {
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std::unique_ptr<MessagePumpLibevent> pump(new MessagePumpLibevent);
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ASSERT_DCHECK_DEATH(pump->Quit());
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}
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class BaseWatcher : public MessagePumpLibevent::FdWatcher {
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public:
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explicit BaseWatcher(MessagePumpLibevent::FdWatchController* controller)
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: controller_(controller) {
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DCHECK(controller_);
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}
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~BaseWatcher() override = default;
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// base:MessagePumpLibevent::FdWatcher interface
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void OnFileCanReadWithoutBlocking(int /* fd */) override { NOTREACHED(); }
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void OnFileCanWriteWithoutBlocking(int /* fd */) override { NOTREACHED(); }
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protected:
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MessagePumpLibevent::FdWatchController* controller_;
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};
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class DeleteWatcher : public BaseWatcher {
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public:
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explicit DeleteWatcher(MessagePumpLibevent::FdWatchController* controller)
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: BaseWatcher(controller) {}
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~DeleteWatcher() override { DCHECK(!controller_); }
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void OnFileCanWriteWithoutBlocking(int /* fd */) override {
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DCHECK(controller_);
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delete controller_;
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controller_ = nullptr;
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}
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};
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TEST_F(MessagePumpLibeventTest, DeleteWatcher) {
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std::unique_ptr<MessagePumpLibevent> pump(new MessagePumpLibevent);
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MessagePumpLibevent::FdWatchController* watcher =
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new MessagePumpLibevent::FdWatchController(FROM_HERE);
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DeleteWatcher delegate(watcher);
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pump->WatchFileDescriptor(pipefds_[1],
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false, MessagePumpLibevent::WATCH_READ_WRITE, watcher, &delegate);
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// Spoof a libevent notification.
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OnLibeventNotification(pump.get(), watcher);
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}
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class StopWatcher : public BaseWatcher {
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public:
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explicit StopWatcher(MessagePumpLibevent::FdWatchController* controller)
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: BaseWatcher(controller) {}
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~StopWatcher() override = default;
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void OnFileCanWriteWithoutBlocking(int /* fd */) override {
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controller_->StopWatchingFileDescriptor();
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}
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};
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TEST_F(MessagePumpLibeventTest, StopWatcher) {
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std::unique_ptr<MessagePumpLibevent> pump(new MessagePumpLibevent);
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MessagePumpLibevent::FdWatchController watcher(FROM_HERE);
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StopWatcher delegate(&watcher);
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pump->WatchFileDescriptor(pipefds_[1],
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false, MessagePumpLibevent::WATCH_READ_WRITE, &watcher, &delegate);
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// Spoof a libevent notification.
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OnLibeventNotification(pump.get(), &watcher);
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}
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void QuitMessageLoopAndStart(const Closure& quit_closure) {
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quit_closure.Run();
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RunLoop runloop(RunLoop::Type::kNestableTasksAllowed);
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ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, runloop.QuitClosure());
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runloop.Run();
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}
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class NestedPumpWatcher : public MessagePumpLibevent::FdWatcher {
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public:
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NestedPumpWatcher() = default;
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~NestedPumpWatcher() override = default;
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void OnFileCanReadWithoutBlocking(int /* fd */) override {
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RunLoop runloop;
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ThreadTaskRunnerHandle::Get()->PostTask(
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FROM_HERE, BindOnce(&QuitMessageLoopAndStart, runloop.QuitClosure()));
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runloop.Run();
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}
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void OnFileCanWriteWithoutBlocking(int /* fd */) override {}
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};
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TEST_F(MessagePumpLibeventTest, NestedPumpWatcher) {
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std::unique_ptr<MessagePumpLibevent> pump(new MessagePumpLibevent);
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MessagePumpLibevent::FdWatchController watcher(FROM_HERE);
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NestedPumpWatcher delegate;
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pump->WatchFileDescriptor(pipefds_[1],
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false, MessagePumpLibevent::WATCH_READ, &watcher, &delegate);
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// Spoof a libevent notification.
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OnLibeventNotification(pump.get(), &watcher);
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}
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void FatalClosure() {
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FAIL() << "Reached fatal closure.";
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}
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class QuitWatcher : public BaseWatcher {
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public:
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QuitWatcher(MessagePumpLibevent::FdWatchController* controller,
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base::Closure quit_closure)
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: BaseWatcher(controller), quit_closure_(std::move(quit_closure)) {}
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void OnFileCanReadWithoutBlocking(int /* fd */) override {
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// Post a fatal closure to the MessageLoop before we quit it.
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ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, BindOnce(&FatalClosure));
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quit_closure_.Run();
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}
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private:
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base::Closure quit_closure_;
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};
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void WriteFDWrapper(const int fd,
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const char* buf,
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int size,
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WaitableEvent* event) {
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ASSERT_TRUE(WriteFileDescriptor(fd, buf, size));
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}
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// Tests that MessagePumpLibevent quits immediately when it is quit from
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// libevent's event_base_loop().
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TEST_F(MessagePumpLibeventTest, QuitWatcher) {
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// Delete the old MessageLoop so that we can manage our own one here.
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ui_loop_.reset();
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MessagePumpLibevent* pump = new MessagePumpLibevent; // owned by |loop|.
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MessageLoop loop(WrapUnique(pump));
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RunLoop run_loop;
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MessagePumpLibevent::FdWatchController controller(FROM_HERE);
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QuitWatcher delegate(&controller, run_loop.QuitClosure());
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WaitableEvent event(WaitableEvent::ResetPolicy::AUTOMATIC,
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WaitableEvent::InitialState::NOT_SIGNALED);
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std::unique_ptr<WaitableEventWatcher> watcher(new WaitableEventWatcher);
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// Tell the pump to watch the pipe.
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pump->WatchFileDescriptor(pipefds_[0], false, MessagePumpLibevent::WATCH_READ,
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&controller, &delegate);
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// Make the IO thread wait for |event| before writing to pipefds[1].
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const char buf = 0;
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WaitableEventWatcher::EventCallback write_fd_task =
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BindOnce(&WriteFDWrapper, pipefds_[1], &buf, 1);
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io_runner()->PostTask(
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FROM_HERE, BindOnce(IgnoreResult(&WaitableEventWatcher::StartWatching),
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Unretained(watcher.get()), &event,
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std::move(write_fd_task), io_runner()));
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// Queue |event| to signal on |loop|.
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loop.task_runner()->PostTask(
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FROM_HERE, BindOnce(&WaitableEvent::Signal, Unretained(&event)));
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// Now run the MessageLoop.
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run_loop.Run();
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// StartWatching can move |watcher| to IO thread. Release on IO thread.
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io_runner()->PostTask(FROM_HERE, BindOnce(&WaitableEventWatcher::StopWatching,
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Owned(watcher.release())));
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}
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} // namespace
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} // namespace base
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