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// Copyright (c) 2010 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/spdy/spdy_http_stream.h"
#include <list>
#include "base/logging.h"
#include "base/message_loop.h"
#include "net/http/http_request_info.h"
#include "net/http/http_response_info.h"
#include "net/spdy/spdy_session.h"
namespace net {
SpdyHttpStream::SpdyHttpStream(
SpdySession* session, spdy::SpdyStreamId stream_id, bool pushed)
: SpdyStream(session, stream_id, pushed),
download_finished_(false),
user_callback_(NULL),
user_buffer_len_(0),
buffered_read_callback_pending_(false),
more_read_data_pending_(false) {}
SpdyHttpStream::~SpdyHttpStream() {
DLOG(INFO) << "Deleting SpdyHttpStream for stream " << stream_id();
}
uint64 SpdyHttpStream::GetUploadProgress() const {
if (!request_body_stream())
return 0;
return request_body_stream()->position();
}
int SpdyHttpStream::ReadResponseHeaders(CompletionCallback* callback) {
DCHECK(is_idle());
// Note: The SpdyStream may have already received the response headers, so
// this call may complete synchronously.
CHECK(callback);
int result = DoReadResponseHeaders();
if (result == ERR_IO_PENDING) {
CHECK(!user_callback_);
user_callback_ = callback;
}
return result;
}
int SpdyHttpStream::ReadResponseBody(
IOBuffer* buf, int buf_len, CompletionCallback* callback) {
DCHECK(is_idle());
CHECK(buf);
CHECK(buf_len);
CHECK(callback);
CHECK(!cancelled());
// If we have data buffered, complete the IO immediately.
if (!response_body_.empty()) {
int bytes_read = 0;
while (!response_body_.empty() && buf_len > 0) {
scoped_refptr<IOBufferWithSize> data = response_body_.front();
const int bytes_to_copy = std::min(buf_len, data->size());
memcpy(&(buf->data()[bytes_read]), data->data(), bytes_to_copy);
buf_len -= bytes_to_copy;
if (bytes_to_copy == data->size()) {
response_body_.pop_front();
} else {
const int bytes_remaining = data->size() - bytes_to_copy;
IOBufferWithSize* new_buffer = new IOBufferWithSize(bytes_remaining);
memcpy(new_buffer->data(), &(data->data()[bytes_to_copy]),
bytes_remaining);
response_body_.pop_front();
response_body_.push_front(new_buffer);
}
bytes_read += bytes_to_copy;
}
return bytes_read;
} else if (response_complete()) {
return response_status();
}
CHECK(!user_callback_);
CHECK(!user_buffer_);
CHECK_EQ(0, user_buffer_len_);
user_callback_ = callback;
user_buffer_ = buf;
user_buffer_len_ = buf_len;
return ERR_IO_PENDING;
}
int SpdyHttpStream::SendRequest(UploadDataStream* upload_data,
HttpResponseInfo* response,
CompletionCallback* callback) {
CHECK(callback);
CHECK(!cancelled());
CHECK(response);
int result = DoSendRequest(upload_data, response);
if (result == ERR_IO_PENDING) {
CHECK(!user_callback_);
user_callback_ = callback;
}
return result;
}
void SpdyHttpStream::Cancel() {
user_callback_ = NULL;
DoCancel();
}
int SpdyHttpStream::OnResponseReceived(const HttpResponseInfo& response) {
int rv = DoOnResponseReceived(response);
if (user_callback_)
DoCallback(rv);
return rv;
}
bool SpdyHttpStream::OnDataReceived(const char* data, int length) {
bool result = DoOnDataReceived(data, length);
// Note that data may be received for a SpdyStream prior to the user calling
// ReadResponseBody(), therefore user_buffer_ may be NULL. This may often
// happen for server initiated streams.
if (result && !response_complete()) {
// Save the received data.
IOBufferWithSize* io_buffer = new IOBufferWithSize(length);
memcpy(io_buffer->data(), data, length);
response_body_.push_back(io_buffer);
if (user_buffer_) {
// Handing small chunks of data to the caller creates measurable overhead.
// We buffer data in short time-spans and send a single read notification.
ScheduleBufferedReadCallback();
}
}
return result;
}
void SpdyHttpStream::OnWriteComplete(int status) {
DoOnWriteComplete(status);
}
void SpdyHttpStream::OnClose(int status) {
if (status == net::OK) {
download_finished_ = true;
set_response_complete(true);
// We need to complete any pending buffered read now.
DoBufferedReadCallback();
}
DoOnClose(status);
if (user_callback_)
DoCallback(status);
}
void SpdyHttpStream::ScheduleBufferedReadCallback() {
// If there is already a scheduled DoBufferedReadCallback, don't issue
// another one. Mark that we have received more data and return.
if (buffered_read_callback_pending_) {
more_read_data_pending_ = true;
return;
}
more_read_data_pending_ = false;
buffered_read_callback_pending_ = true;
const int kBufferTimeMs = 1;
MessageLoop::current()->PostDelayedTask(FROM_HERE, NewRunnableMethod(
this, &SpdyHttpStream::DoBufferedReadCallback), kBufferTimeMs);
}
// Checks to see if we should wait for more buffered data before notifying
// the caller. Returns true if we should wait, false otherwise.
bool SpdyHttpStream::ShouldWaitForMoreBufferedData() const {
// If the response is complete, there is no point in waiting.
if (response_complete())
return false;
int bytes_buffered = 0;
std::list<scoped_refptr<IOBufferWithSize> >::const_iterator it;
for (it = response_body_.begin();
it != response_body_.end() && bytes_buffered < user_buffer_len_;
++it)
bytes_buffered += (*it)->size();
return bytes_buffered < user_buffer_len_;
}
void SpdyHttpStream::DoBufferedReadCallback() {
buffered_read_callback_pending_ = false;
// If the transaction is cancelled or errored out, we don't need to complete
// the read.
if (response_status() != OK || cancelled())
return;
// When more_read_data_pending_ is true, it means that more data has
// arrived since we started waiting. Wait a little longer and continue
// to buffer.
if (more_read_data_pending_ && ShouldWaitForMoreBufferedData()) {
ScheduleBufferedReadCallback();
return;
}
int rv = 0;
if (user_buffer_) {
rv = ReadResponseBody(user_buffer_, user_buffer_len_, user_callback_);
CHECK_NE(rv, ERR_IO_PENDING);
user_buffer_ = NULL;
user_buffer_len_ = 0;
DoCallback(rv);
}
}
void SpdyHttpStream::DoCallback(int rv) {
CHECK_NE(rv, ERR_IO_PENDING);
CHECK(user_callback_);
// Since Run may result in being called back, clear user_callback_ in advance.
CompletionCallback* c = user_callback_;
user_callback_ = NULL;
c->Run(rv);
}
} // namespace net
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