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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 CHROME_BROWSER_SCREEN_AI_SCREEN_AI_SERVICE_HANDLER_BASE_H_
#define CHROME_BROWSER_SCREEN_AI_SCREEN_AI_SERVICE_HANDLER_BASE_H_
#include <optional>
#include <set>
#include <string_view>
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "chrome/browser/screen_ai/resource_monitor.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "services/screen_ai/public/mojom/screen_ai_factory.mojom.h"
namespace base {
class Process;
}
namespace screen_ai {
using ServiceStateCallback = base::OnceCallback<void(bool)>;
// Base class for ScreenAI service management.
class ScreenAIServiceHandlerBase
: screen_ai::mojom::ScreenAIServiceShutdownHandler {
public:
ScreenAIServiceHandlerBase();
ScreenAIServiceHandlerBase(const ScreenAIServiceHandlerBase&) = delete;
ScreenAIServiceHandlerBase& operator=(const ScreenAIServiceHandlerBase&) =
delete;
~ScreenAIServiceHandlerBase() override;
// Schedules library download and initializes the service if needed, and
// calls `callback` with initialization result when service is ready or
// failed to initialize.
// Returns the already known state of the service (see `GetServiceState`).
std::optional<bool> GetServiceStateAsync(ServiceStateCallback callback);
// Called when library availability state is changed.
void OnLibraryAvailablityChanged(bool available);
// screen_ai::mojom::ScreenAIServiceShutdownHandler::
void ShuttingDownOnIdle() override;
// Returns true if the connection for the service is bound.
bool IsConnectionBoundForTesting();
// Returns true if sandboxed process is running.
bool IsProcessRunningForTesting();
protected:
std::string GetMetricFullName(std::string_view metric_name) const;
// Initialzies the service if it's not already done.
void InitializeServiceIfNeeded();
// Callback from Screen AI service with library load result.
void SetLibraryLoadState(base::TimeTicks request_start_time, bool successful);
mojo::Remote<mojom::ScreenAIServiceFactory>& screen_ai_service_factory() {
return screen_ai_service_factory_;
}
private:
friend class ScreenAIServiceRouterFactory;
friend class ScreenAIServiceShutdownHandlerTest;
bool GetAndRecordSuspendedState();
void ResetSuspend() { shutdown_handler_data_.suspended = false; }
// Launches the service if it's not already launched.
void LaunchIfNotRunning();
// Called after service is launched.
void OnServiceLaunched(const std::string& process_name,
const base::Process& process);
// Creates resource monitor to track CPU and memory load.
void CreateResourceMonitor(const std::string& process_name);
// True if service is already initialized, false if it is disabled, and
// nullopt if not known.
std::optional<bool> GetServiceState();
// Calls back all pendnding service state requests.
void CallPendingStatusRequests(bool successful);
// Called when ScreenAI service factory is disconnected.
void OnScreenAIServiceDisconnected();
// Returns the service name.
virtual std::string GetServiceName() const = 0;
// Loads the library model files and initializes the service.
virtual void LoadModelFilesAndInitialize(
base::TimeTicks request_start_time) = 0;
virtual bool IsConnectionBound() const = 0;
virtual bool IsServiceEnabled() const = 0;
virtual void ResetConnection() = 0;
// Pending requests to receive service state for each service type.
std::vector<ServiceStateCallback> pending_state_requests_;
std::unique_ptr<ResourceMonitor> resource_monitor_;
struct ShutdownHandlerData {
bool shutdown_message_received = false;
bool suspended = false;
int crash_count = 0;
} shutdown_handler_data_;
base::TimeTicks service_start_time_;
mojo::Receiver<screen_ai::mojom::ScreenAIServiceShutdownHandler>
screen_ai_service_shutdown_handler_;
mojo::Remote<mojom::ScreenAIServiceFactory> screen_ai_service_factory_;
base::WeakPtrFactory<ScreenAIServiceHandlerBase> weak_ptr_factory_{this};
};
class ComponentFiles {
public:
explicit ComponentFiles(const base::FilePath& library_binary_path,
const base::FilePath::CharType* files_list_file_name);
ComponentFiles(const ComponentFiles&) = delete;
ComponentFiles& operator=(const ComponentFiles&) = delete;
~ComponentFiles();
static std::unique_ptr<ComponentFiles> Load(
const base::FilePath::CharType* files_list_file_name);
base::flat_map<base::FilePath, base::File> model_files_;
base::FilePath library_binary_path_;
};
} // namespace screen_ai
#endif // CHROME_BROWSER_SCREEN_AI_SCREEN_AI_SERVICE_HANDLER_BASE_H_
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