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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_FILE_READER_H_
#define EXTENSIONS_BROWSER_FILE_READER_H_
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/single_thread_task_runner.h"
#include "extensions/common/extension_resource.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
// This file defines an interface for reading files asynchronously on a
// background sequence.
// Consider abstracting out a FilePathProvider (ExtensionResource) and moving
// back to chrome/browser/net if other subsystems want to use it.
class FileReader : public base::RefCountedThreadSafe<FileReader> {
public:
// Passes the result of loading the files in `data`, or reports the
// encountered error in `error`. If there was an error, `data` will be empty.
using DoneCallback =
base::OnceCallback<void(std::vector<std::unique_ptr<std::string>> data,
absl::optional<std::string> error)>;
// Lets the caller accomplish tasks on the file data, after the file content
// has been read. This is called once per file successfully read (it is not
// invoked if a file read fails).
using OptionalFileSequenceTask = base::RepeatingCallback<void(std::string*)>;
FileReader(std::vector<extensions::ExtensionResource> resources,
OptionalFileSequenceTask file_sequence_task,
DoneCallback done_callback);
// Called to start reading the files on a background sequence. Upon
// completion, the callback will be notified of the results.
void Start();
private:
friend class base::RefCountedThreadSafe<FileReader>;
~FileReader();
void ReadFilesOnFileSequence();
std::vector<extensions::ExtensionResource> resources_;
OptionalFileSequenceTask optional_file_sequence_task_;
DoneCallback done_callback_;
const scoped_refptr<base::SingleThreadTaskRunner> origin_task_runner_;
DISALLOW_COPY_AND_ASSIGN(FileReader);
};
#endif // EXTENSIONS_BROWSER_FILE_READER_H_
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