src/cobalt/loader/url_fetcher_string_writer.h

// Copyright 2019 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef COBALT_LOADER_URL_FETCHER_STRING_WRITER_H_
#define COBALT_LOADER_URL_FETCHER_STRING_WRITER_H_

#include <memory>
#include <string>

#include "base/callback.h"
#include "base/synchronization/lock.h"
#include "base/task_runner.h"
#include "net/base/io_buffer.h"
#include "net/url_request/url_fetcher_response_writer.h"

namespace cobalt {
namespace loader {

class URLFetcherStringWriter : public net::URLFetcherResponseWriter {
 public:
  // typedef base::RepeatingCallback<void(std::unique_ptr<std::string>)>
  // OnWriteCallback; URLFetcherStringWriter(OnWriteCallback callback,
  // base::TaskRunner* consumer_task_runner);
  URLFetcherStringWriter();
  ~URLFetcherStringWriter() override;

  bool HasData() const;
  void GetAndResetData(std::string* data);

  // URLFetcherResponseWriter overrides:
  int Initialize(net::CompletionOnceCallback callback) override;
  void OnResponseStarted(int64_t content_length) override;
  int Write(net::IOBuffer* buffer, int num_bytes,
            net::CompletionOnceCallback callback) override;
  int Finish(int net_error, net::CompletionOnceCallback callback) override;

 private:
  // This class can be accessed by both network thread and MainWebModule thread.
  mutable base::Lock lock_;
  int64_t content_length_ = -1;
  int64_t content_offset_ = 0;
  std::string data_;
  // OnWriteCallback on_write_callback_;
  // base::TaskRunner* consumer_task_runner_;

  DISALLOW_COPY_AND_ASSIGN(URLFetcherStringWriter);
};

}  // namespace loader
}  // namespace cobalt

#endif  // COBALT_LOADER_URL_FETCHER_STRING_WRITER_H_