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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_SERVICE_GL_GPU_LOG_MESSAGE_MANAGER_H_
#define COMPONENTS_VIZ_SERVICE_GL_GPU_LOG_MESSAGE_MANAGER_H_
#include <string>
#include <utility>
#include <vector>
#include "base/functional/callback.h"
#include "base/no_destructor.h"
#include "base/synchronization/lock.h"
#include "base/task/single_thread_task_runner.h"
#include "components/viz/service/viz_service_export.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "services/viz/privileged/mojom/gl/gpu_logging.mojom.h"
namespace viz {
// This class is a singleton which manages LOG() message forwarding before and
// after GpuServiceImpl InitializeWithHost(). Prior to initialize, log messages
// are deferred and kept within the class. When initialized GpuServiceImpl,
// InstallPostInitializeLogHandler() will be called to flush deferred messages
// and route new ones directly to browser. This class also makes sure the
// logging mojo interface is bound to the IO thread and terminate process on the
// IO thread.
class VIZ_SERVICE_EXPORT GpuLogMessageManager {
public:
static GpuLogMessageManager* GetInstance();
GpuLogMessageManager(const GpuLogMessageManager&) = delete;
GpuLogMessageManager& operator=(const GpuLogMessageManager&) = delete;
// Queues a deferred LOG() message into |deferred_messages_| unless
// |should_route_messages_| has been set to true -- in which case
// RouteMessage() is called.
void AddDeferredMessage(int severity,
const std::string& header,
const std::string& message);
// Used after InstallPostInitializeLogHandler() to route messages directly to
// the GPU logging mojo interface, mojo interface send messages on IO thread.
void RouteMessage(int severity,
const std::string& header,
const std::string& message);
// If InstallPostInitializeLogHandler() will never be called, this method is
// called prior to process exit to ensure logs are forwarded.
void FlushMessages(mojom::GpuLogging* gpu_logging);
// Used prior to GpuServiceImpl initialization during GpuMain startup to
// ensure logs aren't lost before initialize.
void InstallPreInitializeLogHandler();
// Called when GpuServiceImpl is initialized, to take over logging from the
// PostInitializeLogHandler(). Flushes all deferred messages.
void InstallPostInitializeLogHandler(
mojo::PendingRemote<mojom::GpuLogging> pending_remote,
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner);
// Called when GpuServiceImpl is shutting down.
void ShutdownLogging();
// Terminate the process on IO thread and block the main thread.
void TerminateProcess(int exit_code);
private:
friend class base::NoDestructor<GpuLogMessageManager>;
GpuLogMessageManager();
~GpuLogMessageManager() = delete;
// Bind GpuLogging mojo interface to specified |task_runner|.
void Bind(mojo::PendingRemote<mojom::GpuLogging> pending_remote,
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner);
void BindOnIOThread(mojo::PendingRemote<mojom::GpuLogging> pending_remote);
void ResetLoggingOnIOThread();
void TerminateProcessOnIO(int exit_code);
struct LogMessage {
LogMessage(int severity,
const std::string& header,
const std::string& message)
: severity(severity),
header(std::move(header)),
message(std::move(message)) {}
const int severity;
const std::string header;
const std::string message;
};
base::Lock message_lock_;
std::vector<LogMessage> deferred_messages_ GUARDED_BY(message_lock_);
mojo::Remote<mojom::GpuLogging> gpu_logging_;
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_GL_GPU_LOG_MESSAGE_MANAGER_H_
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