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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef STORAGE_BROWSER_FILE_SYSTEM_LOCAL_FILE_STREAM_WRITER_H_
#define STORAGE_BROWSER_FILE_SYSTEM_LOCAL_FILE_STREAM_WRITER_H_
#include <stdint.h>
#include <memory>
#include <utility>
#include "base/component_export.h"
#include "base/files/file_path.h"
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/task/task_runner.h"
#include "base/types/pass_key.h"
#include "storage/browser/file_system/file_stream_writer.h"
namespace net {
class FileStream;
}
namespace storage {
// This class is a thin wrapper around net::FileStream for writing local files.
class COMPONENT_EXPORT(STORAGE_BROWSER) LocalFileStreamWriter
: public FileStreamWriter {
public:
LocalFileStreamWriter(base::TaskRunner* task_runner,
const base::FilePath& file_path,
int64_t initial_offset,
OpenOrCreate open_or_create,
base::PassKey<FileStreamWriter> pass_key);
LocalFileStreamWriter(const LocalFileStreamWriter&) = delete;
LocalFileStreamWriter& operator=(const LocalFileStreamWriter&) = delete;
~LocalFileStreamWriter() override;
// FileStreamWriter overrides.
int Write(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) override;
int Cancel(net::CompletionOnceCallback callback) override;
int Flush(FlushMode flush_mode,
net::CompletionOnceCallback callback) override;
private:
// Opens |file_path_| and if it succeeds, proceeds to InitiateSeek().
// If failed, the error code is returned by calling |error_callback|.
int InitiateOpen(base::OnceClosure main_operation);
void DidOpen(base::OnceClosure main_operation, int result);
// Seeks to |initial_offset_| and proceeds to |main_operation| if it succeeds.
// If failed, the error code is returned by calling |error_callback|.
void InitiateSeek(base::OnceClosure main_operation);
void DidSeek(base::OnceClosure main_operation, int64_t result);
// Passed as the |main_operation| of InitiateOpen() function.
void ReadyToWrite(net::IOBuffer* buf, int buf_len);
// Writes asynchronously to the file.
int InitiateWrite(net::IOBuffer* buf, int buf_len);
void DidWrite(int result);
// Flushes asynchronously to the file.
int InitiateFlush(net::CompletionOnceCallback callback);
void DidFlush(net::CompletionOnceCallback callback, int result);
// Stops the in-flight operation and calls |cancel_callback_| if it has been
// set by Cancel() for the current operation.
bool CancelIfRequested();
// Initialization parameters.
const base::FilePath file_path_;
OpenOrCreate open_or_create_;
const int64_t initial_offset_;
scoped_refptr<base::TaskRunner> task_runner_;
// Current states of the operation.
bool has_pending_operation_;
std::unique_ptr<net::FileStream> stream_impl_;
net::CompletionOnceCallback write_callback_;
net::CompletionOnceCallback cancel_callback_;
base::WeakPtrFactory<LocalFileStreamWriter> weak_factory_{this};
};
} // namespace storage
#endif // STORAGE_BROWSER_FILE_SYSTEM_LOCAL_FILE_STREAM_WRITER_H_
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