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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.
#include "ash/system/diagnostics/async_log.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
namespace ash {
namespace diagnostics {
namespace {
// Create the log file. Called on the first write to the file.
void CreateFile(const base::FilePath& file_path) {
// Regarding this DCHECK(), please see AsyncLogTest.NoUseAfterFreeCrash for
// more comments.
DCHECK(!base::PathExists(file_path));
if (!base::PathExists(file_path.DirName())) {
const bool create_dir_success = base::CreateDirectory(file_path.DirName());
if (!create_dir_success) {
LOG(ERROR) << "Failed to create diagnostics log directory "
<< file_path.DirName();
return;
}
}
const bool create_file_success = base::WriteFile(file_path, "");
if (!create_file_success) {
LOG(ERROR) << "Failed to create diagnostics log file " << file_path;
}
}
// Append log to the file. Run on the task runner.
void AppendImpl(const base::FilePath& file_path, const std::string& text) {
// Ensure file exists.
if (!base::PathExists(file_path)) {
CreateFile(file_path);
}
// Append text to file.
base::AppendToFile(file_path, text);
}
} // namespace
AsyncLog::AsyncLog(const base::FilePath& file_path) : file_path_(file_path) {
sequenced_task_runner_ = base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskPriority::USER_VISIBLE,
base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
}
AsyncLog::~AsyncLog() = default;
void AsyncLog::Append(const std::string& text) {
sequenced_task_runner_->PostTask(
FROM_HERE, base::BindOnce(&AppendImpl, file_path_, text));
}
std::string AsyncLog::GetContents() const {
if (!base::PathExists(file_path_)) {
return "";
}
std::string contents;
base::ReadFileToString(file_path_, &contents);
return contents;
}
void AsyncLog::SetTaskRunnerForTesting(
const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
sequenced_task_runner_ = std::move(task_runner);
}
} // namespace diagnostics
} // namespace ash
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