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// Copyright (c) 2013 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.
#include "net/url_request/url_fetcher_response_writer.h"
#include <memory>
#include <utility>
#include "base/bind.h"
#include "base/files/file_util.h"
#include "base/location.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_runner_util.h"
#include "net/base/file_stream.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
namespace net {
URLFetcherStringWriter* URLFetcherResponseWriter::AsStringWriter() {
return nullptr;
}
URLFetcherFileWriter* URLFetcherResponseWriter::AsFileWriter() {
return nullptr;
}
URLFetcherStringWriter::URLFetcherStringWriter() = default;
URLFetcherStringWriter::~URLFetcherStringWriter() = default;
int URLFetcherStringWriter::Initialize(CompletionOnceCallback callback) {
data_.clear();
return OK;
}
int URLFetcherStringWriter::Write(IOBuffer* buffer,
int num_bytes,
CompletionOnceCallback callback) {
data_.append(buffer->data(), num_bytes);
return num_bytes;
}
int URLFetcherStringWriter::Finish(int net_error,
CompletionOnceCallback callback) {
// Do nothing.
return OK;
}
URLFetcherStringWriter* URLFetcherStringWriter::AsStringWriter() {
return this;
}
URLFetcherFileWriter::URLFetcherFileWriter(
scoped_refptr<base::SequencedTaskRunner> file_task_runner,
const base::FilePath& file_path)
: file_task_runner_(file_task_runner), file_path_(file_path) {
DCHECK(file_task_runner_.get());
}
URLFetcherFileWriter::~URLFetcherFileWriter() {
CloseAndDeleteFile();
}
int URLFetcherFileWriter::Initialize(CompletionOnceCallback callback) {
DCHECK(!callback_);
file_stream_ = std::make_unique<FileStream>(file_task_runner_);
int result = ERR_IO_PENDING;
owns_file_ = true;
if (file_path_.empty()) {
base::FilePath* temp_file_path = new base::FilePath;
base::PostTaskAndReplyWithResult(
file_task_runner_.get(), FROM_HERE,
base::BindOnce(&base::CreateTemporaryFile, temp_file_path),
base::BindOnce(&URLFetcherFileWriter::DidCreateTempFile,
weak_factory_.GetWeakPtr(),
base::Owned(temp_file_path)));
} else {
result =
file_stream_->Open(file_path_,
base::File::FLAG_WRITE | base::File::FLAG_ASYNC |
base::File::FLAG_CREATE_ALWAYS,
base::BindOnce(&URLFetcherFileWriter::OnIOCompleted,
weak_factory_.GetWeakPtr()));
DCHECK_NE(OK, result);
}
if (result == ERR_IO_PENDING) {
callback_ = std::move(callback);
return result;
}
if (result < 0)
CloseAndDeleteFile();
return result;
}
int URLFetcherFileWriter::Write(IOBuffer* buffer,
int num_bytes,
CompletionOnceCallback callback) {
DCHECK(file_stream_) << "Call Initialize() first.";
DCHECK(owns_file_);
DCHECK(!callback_);
int result =
file_stream_->Write(buffer, num_bytes,
base::BindOnce(&URLFetcherFileWriter::OnIOCompleted,
weak_factory_.GetWeakPtr()));
if (result == ERR_IO_PENDING) {
callback_ = std::move(callback);
return result;
}
if (result < 0)
CloseAndDeleteFile();
return result;
}
int URLFetcherFileWriter::Finish(int net_error,
CompletionOnceCallback callback) {
DCHECK_NE(ERR_IO_PENDING, net_error);
// If an error occurred, simply delete the file after any pending operation
// is done. Do not call file_stream_->Close() because there might be an
// operation pending. See crbug.com/487732.
if (net_error < 0) {
// Cancel callback and invalid weak ptrs so as to cancel any posted task.
callback_.Reset();
weak_factory_.InvalidateWeakPtrs();
CloseAndDeleteFile();
return OK;
}
DCHECK(!callback_);
// If the file_stream_ still exists at this point, close it.
if (file_stream_) {
int result = file_stream_->Close(base::BindOnce(
&URLFetcherFileWriter::CloseComplete, weak_factory_.GetWeakPtr()));
if (result == ERR_IO_PENDING) {
callback_ = std::move(callback);
return result;
}
file_stream_.reset();
return result;
}
return OK;
}
URLFetcherFileWriter* URLFetcherFileWriter::AsFileWriter() {
return this;
}
void URLFetcherFileWriter::DisownFile() {
// Disowning is done by the delegate's OnURLFetchComplete method.
// The file should be closed by the time that method is called.
DCHECK(!file_stream_);
owns_file_ = false;
}
void URLFetcherFileWriter::CloseAndDeleteFile() {
if (!owns_file_)
return;
file_stream_.reset();
DisownFile();
file_task_runner_->PostTask(FROM_HERE,
base::GetDeleteFileCallback(file_path_));
}
void URLFetcherFileWriter::DidCreateTempFile(base::FilePath* temp_file_path,
bool success) {
if (!success) {
OnIOCompleted(ERR_FILE_NOT_FOUND);
return;
}
file_path_ = *temp_file_path;
const int result = file_stream_->Open(
file_path_,
base::File::FLAG_WRITE | base::File::FLAG_ASYNC | base::File::FLAG_OPEN,
base::BindOnce(&URLFetcherFileWriter::OnIOCompleted,
weak_factory_.GetWeakPtr()));
if (result != ERR_IO_PENDING)
OnIOCompleted(result);
}
void URLFetcherFileWriter::OnIOCompleted(int result) {
if (result < OK)
CloseAndDeleteFile();
if (!callback_.is_null())
std::move(callback_).Run(result);
}
void URLFetcherFileWriter::CloseComplete(int result) {
// Destroy |file_stream_| whether or not the close succeeded.
file_stream_.reset();
if (!callback_.is_null())
std::move(callback_).Run(result);
}
} // namespace net
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