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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/quic/quic_connection_helper.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/metrics/sparse_histogram.h"
#include "base/task_runner.h"
#include "base/time/time.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/quic/quic_utils.h"
namespace net {
namespace {
class QuicChromeAlarm : public QuicAlarm {
public:
QuicChromeAlarm(const QuicClock* clock,
base::TaskRunner* task_runner,
QuicAlarm::Delegate* delegate)
: QuicAlarm(delegate),
clock_(clock),
task_runner_(task_runner),
task_posted_(false),
weak_factory_(this) {}
protected:
virtual void SetImpl() OVERRIDE {
DCHECK(deadline().IsInitialized());
if (task_posted_) {
// Since tasks can not be un-posted, OnAlarm will be invoked which
// will notice that deadline has not yet been reached, and will set
// the alarm for the new deadline.
return;
}
int64 delay_us = deadline().Subtract(clock_->Now()).ToMicroseconds();
if (delay_us < 0) {
delay_us = 0;
}
task_runner_->PostDelayedTask(
FROM_HERE,
base::Bind(&QuicChromeAlarm::OnAlarm, weak_factory_.GetWeakPtr()),
base::TimeDelta::FromMicroseconds(delay_us));
task_posted_ = true;
}
virtual void CancelImpl() OVERRIDE {
DCHECK(!deadline().IsInitialized());
// Since tasks can not be un-posted, OnAlarm will be invoked which
// will notice that deadline is not Initialized and will do nothing.
}
private:
void OnAlarm() {
DCHECK(task_posted_);
task_posted_ = false;
// The alarm may have been cancelled.
if (!deadline().IsInitialized()) {
return;
}
// The alarm may have been re-set to a later time.
if (clock_->Now() < deadline()) {
SetImpl();
return;
}
Fire();
}
const QuicClock* clock_;
base::TaskRunner* task_runner_;
bool task_posted_;
base::WeakPtrFactory<QuicChromeAlarm> weak_factory_;
};
} // namespace
QuicConnectionHelper::QuicConnectionHelper(base::TaskRunner* task_runner,
const QuicClock* clock,
QuicRandom* random_generator,
DatagramClientSocket* socket)
: weak_factory_(this),
task_runner_(task_runner),
socket_(socket),
clock_(clock),
random_generator_(random_generator) {
}
QuicConnectionHelper::~QuicConnectionHelper() {
}
void QuicConnectionHelper::SetConnection(QuicConnection* connection) {
connection_ = connection;
}
const QuicClock* QuicConnectionHelper::GetClock() const {
return clock_;
}
QuicRandom* QuicConnectionHelper::GetRandomGenerator() {
return random_generator_;
}
int QuicConnectionHelper::WritePacketToWire(
const QuicEncryptedPacket& packet,
int* error) {
if (connection_->ShouldSimulateLostPacket()) {
DLOG(INFO) << "Dropping packet due to fake packet loss.";
*error = 0;
return packet.length();
}
scoped_refptr<StringIOBuffer> buf(
new StringIOBuffer(std::string(packet.data(),
packet.length())));
int rv = socket_->Write(buf.get(),
packet.length(),
base::Bind(&QuicConnectionHelper::OnWriteComplete,
weak_factory_.GetWeakPtr()));
if (rv >= 0) {
*error = 0;
} else {
if (rv != ERR_IO_PENDING) {
UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicSession.WriteError", -rv);
}
*error = rv;
rv = -1;
}
return rv;
}
bool QuicConnectionHelper::IsWriteBlockedDataBuffered() {
// Chrome sockets' Write() methods buffer the data until the Write is
// permitted.
return true;
}
bool QuicConnectionHelper::IsWriteBlocked(int error) {
return error == ERR_IO_PENDING;
}
QuicAlarm* QuicConnectionHelper::CreateAlarm(QuicAlarm::Delegate* delegate) {
return new QuicChromeAlarm(clock_, task_runner_, delegate);
}
void QuicConnectionHelper::OnWriteComplete(int result) {
// TODO(rch): Inform the connection about the result.
connection_->OnCanWrite();
}
} // namespace net
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