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// Copyright 2014 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 "content/browser/loader/stream_writer.h"
#include "base/callback_helpers.h"
#include "base/guid.h"
#include "content/browser/loader/resource_controller.h"
#include "content/browser/streams/stream.h"
#include "content/browser/streams/stream_registry.h"
#include "net/base/io_buffer.h"
#include "url/gurl.h"
#include "url/url_constants.h"
namespace content {
StreamWriter::StreamWriter() : immediate_mode_(false) {}
StreamWriter::~StreamWriter() {
if (stream_.get())
Finalize(0);
}
void StreamWriter::InitializeStream(StreamRegistry* registry,
const GURL& origin,
const base::Closure& cancel_callback) {
cancel_callback_ = cancel_callback;
DCHECK(!stream_.get());
// TODO(tyoshino): Find a way to share this with the blob URL creation in
// WebKit.
GURL url(std::string(url::kBlobScheme) + ":" + origin.spec() +
base::GenerateGUID());
stream_ = new Stream(registry, this, url);
}
void StreamWriter::OnWillRead(scoped_refptr<net::IOBuffer>* buf,
int* buf_size,
int min_size) {
static const int kReadBufSize = 32768;
DCHECK(buf);
DCHECK(buf_size);
DCHECK_LE(min_size, kReadBufSize);
if (!read_buffer_.get())
read_buffer_ = new net::IOBuffer(kReadBufSize);
*buf = read_buffer_.get();
*buf_size = kReadBufSize;
}
void StreamWriter::OnReadCompleted(
int bytes_read,
const base::Closure& need_more_data_callback) {
DCHECK(!need_more_data_callback_);
if (!bytes_read) {
need_more_data_callback.Run();
return;
}
// We have more data to read.
DCHECK(read_buffer_.get());
// Release the ownership of the buffer, and store a reference
// to it. A new one will be allocated in OnWillRead().
scoped_refptr<net::IOBuffer> buffer;
read_buffer_.swap(buffer);
stream_->AddData(buffer, bytes_read);
if (immediate_mode_)
stream_->Flush();
if (!stream_->can_add_data()) {
need_more_data_callback_ = need_more_data_callback;
return;
}
need_more_data_callback.Run();
}
void StreamWriter::Finalize(int status) {
DCHECK(stream_.get());
stream_->Finalize(status);
stream_->RemoveWriteObserver(this);
stream_ = nullptr;
}
void StreamWriter::OnSpaceAvailable(Stream* stream) {
base::ResetAndReturn(&need_more_data_callback_).Run();
}
void StreamWriter::OnClose(Stream* stream) {
cancel_callback_.Run();
}
} // namespace content
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