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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 "content/browser/streams/stream.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/values.h"
#include "content/browser/streams/stream_handle_impl.h"
#include "content/browser/streams/stream_read_observer.h"
#include "content/browser/streams/stream_registry.h"
#include "content/browser/streams/stream_write_observer.h"
#include "net/base/io_buffer.h"
#include "net/http/http_response_headers.h"
namespace {
// Start throttling the connection at about 1MB.
const size_t kDeferSizeThreshold = 40 * 32768;
}
namespace content {
Stream::Stream(StreamRegistry* registry,
StreamWriteObserver* write_observer,
const GURL& url)
: can_add_data_(true),
url_(url),
data_length_(0),
data_bytes_read_(0),
last_total_buffered_bytes_(0),
registry_(registry),
read_observer_(NULL),
write_observer_(write_observer),
stream_handle_(NULL),
weak_ptr_factory_(this) {
CreateByteStream(base::MessageLoopProxy::current(),
base::MessageLoopProxy::current(),
kDeferSizeThreshold,
&writer_,
&reader_);
// Setup callback for writing.
writer_->RegisterCallback(base::Bind(&Stream::OnSpaceAvailable,
weak_ptr_factory_.GetWeakPtr()));
reader_->RegisterCallback(base::Bind(&Stream::OnDataAvailable,
weak_ptr_factory_.GetWeakPtr()));
registry_->RegisterStream(this);
}
Stream::~Stream() {
}
bool Stream::SetReadObserver(StreamReadObserver* observer) {
if (read_observer_)
return false;
read_observer_ = observer;
return true;
}
void Stream::RemoveReadObserver(StreamReadObserver* observer) {
DCHECK(observer == read_observer_);
read_observer_ = NULL;
}
void Stream::RemoveWriteObserver(StreamWriteObserver* observer) {
DCHECK(observer == write_observer_);
write_observer_ = NULL;
}
void Stream::Abort() {
// Clear all buffer. It's safe to clear reader_ here since the same thread
// is used for both input and output operation.
writer_.reset();
reader_.reset();
ClearBuffer();
can_add_data_ = false;
registry_->UnregisterStream(url());
}
void Stream::AddData(scoped_refptr<net::IOBuffer> buffer, size_t size) {
if (!writer_.get())
return;
size_t current_buffered_bytes = writer_->GetTotalBufferedBytes();
if (!registry_->UpdateMemoryUsage(url(), current_buffered_bytes, size)) {
Abort();
return;
}
// Now it's guaranteed that this doesn't overflow. This must be done before
// Write() since GetTotalBufferedBytes() may return different value after
// Write() call, so if we use the new value, information in this instance and
// one in |registry_| become inconsistent.
last_total_buffered_bytes_ = current_buffered_bytes + size;
can_add_data_ = writer_->Write(buffer, size);
}
void Stream::AddData(const char* data, size_t size) {
if (!writer_.get())
return;
scoped_refptr<net::IOBuffer> io_buffer(new net::IOBuffer(size));
memcpy(io_buffer->data(), data, size);
AddData(io_buffer, size);
}
void Stream::Flush() {
if (!writer_.get())
return;
writer_->Flush();
}
void Stream::Finalize() {
if (!writer_.get())
return;
writer_->Close(0);
writer_.reset();
// Continue asynchronously.
base::MessageLoopProxy::current()->PostTask(
FROM_HERE,
base::Bind(&Stream::OnDataAvailable, weak_ptr_factory_.GetWeakPtr()));
}
Stream::StreamState Stream::ReadRawData(net::IOBuffer* buf,
int buf_size,
int* bytes_read) {
DCHECK(buf);
DCHECK(bytes_read);
*bytes_read = 0;
if (!data_.get()) {
DCHECK(!data_length_);
DCHECK(!data_bytes_read_);
if (!reader_.get())
return STREAM_ABORTED;
ByteStreamReader::StreamState state = reader_->Read(&data_, &data_length_);
switch (state) {
case ByteStreamReader::STREAM_HAS_DATA:
break;
case ByteStreamReader::STREAM_COMPLETE:
registry_->UnregisterStream(url());
return STREAM_COMPLETE;
case ByteStreamReader::STREAM_EMPTY:
return STREAM_EMPTY;
}
}
const size_t remaining_bytes = data_length_ - data_bytes_read_;
size_t to_read =
static_cast<size_t>(buf_size) < remaining_bytes ?
buf_size : remaining_bytes;
memcpy(buf->data(), data_->data() + data_bytes_read_, to_read);
data_bytes_read_ += to_read;
if (data_bytes_read_ >= data_length_)
ClearBuffer();
*bytes_read = to_read;
return STREAM_HAS_DATA;
}
scoped_ptr<StreamHandle> Stream::CreateHandle() {
CHECK(!stream_handle_);
stream_handle_ = new StreamHandleImpl(weak_ptr_factory_.GetWeakPtr());
return scoped_ptr<StreamHandle>(stream_handle_).Pass();
}
void Stream::CloseHandle() {
// Prevent deletion until this function ends.
scoped_refptr<Stream> ref(this);
CHECK(stream_handle_);
stream_handle_ = NULL;
registry_->UnregisterStream(url());
if (write_observer_)
write_observer_->OnClose(this);
}
void Stream::OnSpaceAvailable() {
can_add_data_ = true;
if (write_observer_)
write_observer_->OnSpaceAvailable(this);
}
void Stream::OnDataAvailable() {
if (read_observer_)
read_observer_->OnDataAvailable(this);
}
void Stream::ClearBuffer() {
data_ = NULL;
data_length_ = 0;
data_bytes_read_ = 0;
}
} // namespace content
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