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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_SYSTEM_DIAGNOSTICS_ASYNC_LOG_H_
#define ASH_SYSTEM_DIAGNOSTICS_ASYNC_LOG_H_
#include <string>
#include "ash/ash_export.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/sequenced_task_runner.h"
namespace ash {
namespace diagnostics {
// `AsyncLog` is a simple test logger that appends lines/strings to the end of
// a file. The file is created on first write, and all IO operations occur
// on a `SequencedTaskRunner`.
class ASH_EXPORT AsyncLog {
public:
explicit AsyncLog(const base::FilePath& file_path);
AsyncLog(const AsyncLog&) = delete;
AsyncLog& operator=(const AsyncLog&) = delete;
~AsyncLog();
// Appends text to the file by posting to task runner.
void Append(const std::string& text);
// Returns the current contents as a string.
std::string GetContents() const;
void SetTaskRunnerForTesting(
const scoped_refptr<base::SequencedTaskRunner>& task_runner);
private:
// Path of the log file.
const base::FilePath file_path_;
// Blockable task runner to enable I/O operations.
scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner_;
};
} // namespace diagnostics
} // namespace ash
#endif // ASH_SYSTEM_DIAGNOSTICS_ASYNC_LOG_H_
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