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// Copyright (c) 2012 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/http/http_response_body_drainer.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/http/http_network_session.h"
#include "net/http/http_stream.h"
namespace net {
HttpResponseBodyDrainer::HttpResponseBodyDrainer(HttpStream* stream)
: read_size_(0),
stream_(stream),
next_state_(STATE_NONE),
total_read_(0),
session_(NULL) {}
HttpResponseBodyDrainer::~HttpResponseBodyDrainer() {}
void HttpResponseBodyDrainer::Start(HttpNetworkSession* session) {
StartWithSize(session, kDrainBodyBufferSize);
}
void HttpResponseBodyDrainer::StartWithSize(HttpNetworkSession* session,
int num_bytes_to_drain) {
DCHECK_LE(0, num_bytes_to_drain);
// TODO(simonjam): Consider raising this limit if we're pipelining. If we have
// a bunch of responses in the pipeline, we should be less willing to give up
// while draining.
if (num_bytes_to_drain > kDrainBodyBufferSize) {
Finish(ERR_RESPONSE_BODY_TOO_BIG_TO_DRAIN);
return;
} else if (num_bytes_to_drain == 0) {
Finish(OK);
return;
}
read_size_ = num_bytes_to_drain;
read_buf_ = new IOBuffer(read_size_);
next_state_ = STATE_DRAIN_RESPONSE_BODY;
int rv = DoLoop(OK);
if (rv == ERR_IO_PENDING) {
timer_.Start(FROM_HERE,
base::TimeDelta::FromSeconds(kTimeoutInSeconds),
this,
&HttpResponseBodyDrainer::OnTimerFired);
session_ = session;
session->AddResponseDrainer(this);
return;
}
Finish(rv);
}
int HttpResponseBodyDrainer::DoLoop(int result) {
DCHECK_NE(next_state_, STATE_NONE);
int rv = result;
do {
State state = next_state_;
next_state_ = STATE_NONE;
switch (state) {
case STATE_DRAIN_RESPONSE_BODY:
DCHECK_EQ(OK, rv);
rv = DoDrainResponseBody();
break;
case STATE_DRAIN_RESPONSE_BODY_COMPLETE:
rv = DoDrainResponseBodyComplete(rv);
break;
default:
NOTREACHED() << "bad state";
rv = ERR_UNEXPECTED;
break;
}
} while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
return rv;
}
int HttpResponseBodyDrainer::DoDrainResponseBody() {
next_state_ = STATE_DRAIN_RESPONSE_BODY_COMPLETE;
return stream_->ReadResponseBody(
read_buf_.get(),
read_size_ - total_read_,
base::Bind(&HttpResponseBodyDrainer::OnIOComplete,
base::Unretained(this)));
}
int HttpResponseBodyDrainer::DoDrainResponseBodyComplete(int result) {
DCHECK_NE(ERR_IO_PENDING, result);
if (result < 0)
return result;
total_read_ += result;
if (stream_->IsResponseBodyComplete())
return OK;
DCHECK_LE(total_read_, kDrainBodyBufferSize);
if (total_read_ >= kDrainBodyBufferSize)
return ERR_RESPONSE_BODY_TOO_BIG_TO_DRAIN;
if (result == 0)
return ERR_CONNECTION_CLOSED;
next_state_ = STATE_DRAIN_RESPONSE_BODY;
return OK;
}
void HttpResponseBodyDrainer::OnIOComplete(int result) {
int rv = DoLoop(result);
if (rv != ERR_IO_PENDING) {
timer_.Stop();
Finish(rv);
}
}
void HttpResponseBodyDrainer::OnTimerFired() {
Finish(ERR_TIMED_OUT);
}
void HttpResponseBodyDrainer::Finish(int result) {
DCHECK_NE(ERR_IO_PENDING, result);
if (session_)
session_->RemoveResponseDrainer(this);
if (result < 0) {
stream_->Close(true /* no keep-alive */);
} else {
DCHECK_EQ(OK, result);
stream_->Close(false /* keep-alive */);
}
delete this;
}
} // namespace net
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