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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_COMMON_CONFLICTS_REMOTE_MODULE_WATCHER_WIN_H_
#define CHROME_COMMON_CONFLICTS_REMOTE_MODULE_WATCHER_WIN_H_
#include <memory>
#include <vector>
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "chrome/common/conflicts/module_event_sink_win.mojom.h"
#include "chrome/common/conflicts/module_watcher_win.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace base {
class SingleThreadTaskRunner;
struct OnTaskRunnerDeleter;
} // namespace base
// This class is used to instantiate a ModuleWatcher instance in a child
// process that forwards all the module events to the browser process via the
// mojom::ModuleEventSink interface.
class RemoteModuleWatcher {
public:
// Provided for convenience.
using UniquePtr =
std::unique_ptr<RemoteModuleWatcher, base::OnTaskRunnerDeleter>;
// The amount of time this class waits before sending all the received module
// events in one batch to the browser process.
static constexpr base::TimeDelta kIdleDelay = base::Seconds(5);
RemoteModuleWatcher(const RemoteModuleWatcher&) = delete;
RemoteModuleWatcher& operator=(const RemoteModuleWatcher&) = delete;
~RemoteModuleWatcher();
// Creates a RemoteModuleWatcher instance and initializes it on |task_runner|.
// The instance lives on that task runner and will be destroyed there when the
// UniquePtr is destroyed.
static UniquePtr Create(
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
mojo::PendingRemote<mojom::ModuleEventSink> remote_sink);
private:
explicit RemoteModuleWatcher(
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
// Initializes this instance by connecting the |module_event_sink_| instance
// and starting the |module_watcher_|. Called on |task_runner_|.
void InitializeOnTaskRunner(
mojo::PendingRemote<mojom::ModuleEventSink> remote_sink);
// Receives module load events from the |module_watcher_| and forwards them to
// the |module_event_sink_|.
void HandleModuleEvent(const ModuleWatcher::ModuleEvent& event);
// Sends all accumulated module events in |module_load_addresses_| to the
// |module_event_sink_| in one batch.
void OnTimerFired();
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
// Module events from |module_watcher_| are forwarded to the browser process
// through this sink.
mojo::Remote<mojom::ModuleEventSink> module_event_sink_;
// Observes module load events.
std::unique_ptr<ModuleWatcher> module_watcher_;
// Accumulates module events. They will be sent to the browser process when
// |delay_timer_| fires.
std::vector<uint64_t> module_load_addresses_;
// This timer is used to delay the sending of module events until none have
// been received for |kIdleDelay| amount of time.
base::DelayTimer delay_timer_;
base::WeakPtrFactory<RemoteModuleWatcher> weak_ptr_factory_{this};
};
#endif // CHROME_COMMON_CONFLICTS_REMOTE_MODULE_WATCHER_WIN_H_
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