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// Copyright 2016 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_METRICS_PERF_PERF_OUTPUT_H_
#define CHROME_BROWSER_METRICS_PERF_PERF_OUTPUT_H_
#include <memory>
#include <optional>
#include <string>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/time/time.h"
#include "chromeos/dbus/common/dbus_callback.h"
#include "chromeos/dbus/common/pipe_reader.h"
namespace ash {
class DebugDaemonClient;
}
namespace metrics {
// Class for handling getting output from perf over DBus. Manages the
// asynchronous DBus call and retrieving data from quipper over a pipe.
class PerfOutputCall {
public:
// Called once GetPerfOutput() is complete, or an error occurred.
// The callback may delete this object.
// The argument is one of:
// - Output from "perf record", in PerfDataProto format, OR
// - The empty string if there was an error.
// The output is transferred to |perf_stdout|.
using DoneCallback = base::OnceCallback<void(std::string perf_stdout)>;
PerfOutputCall(ash::DebugDaemonClient* debug_daemon_client,
const std::vector<std::string>& quipper_args,
bool disable_cpu_idle,
DoneCallback callback);
PerfOutputCall(const PerfOutputCall&) = delete;
PerfOutputCall& operator=(const PerfOutputCall&) = delete;
virtual ~PerfOutputCall();
// Stop() is made virtual for mocks in testing.
virtual void Stop();
protected:
// Exposed for mocking in unit test.
PerfOutputCall();
private:
// Internal callbacks.
void OnIOComplete(std::optional<std::string> data);
void OnGetPerfOutput(std::optional<uint64_t> result);
void StopImpl();
// A non-retaining pointer to the DebugDaemonClient instance.
raw_ptr<ash::DebugDaemonClient> debug_daemon_client_;
// Used to capture perf data written to a pipe.
std::unique_ptr<chromeos::PipeReader> perf_data_pipe_reader_;
// Saved arguments.
std::vector<std::string> quipper_args_;
bool disable_cpu_idle_;
DoneCallback done_callback_;
// Whether Stop() is called before OnGetPerfOutput() has returned the session
// ID. If true (meaning Stop() is called very soon after we request perf
// output), the stop request will be sent out after we have the session ID to
// stop the perf session.
bool pending_stop_;
std::optional<uint64_t> perf_session_id_;
SEQUENCE_CHECKER(sequence_checker_);
// To pass around the "this" pointer across threads safely.
base::WeakPtrFactory<PerfOutputCall> weak_factory_{this};
};
} // namespace metrics
#endif // CHROME_BROWSER_METRICS_PERF_PERF_OUTPUT_H_
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