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// Copyright 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 "net/tools/quic/test_tools/packet_dropping_test_writer.h"
#include "base/rand_util.h"
#include "net/tools/quic/quic_epoll_connection_helper.h"
#include "net/tools/quic/quic_socket_utils.h"
using net::test::QuicTestWriter;
namespace net {
namespace tools {
namespace test {
// An alarm that is scheduled if a blocked socket is simulated to indicate
// it's writable again.
class WriteUnblockedAlarm : public QuicAlarm::Delegate {
public:
explicit WriteUnblockedAlarm(PacketDroppingTestWriter* writer)
: writer_(writer) { }
virtual QuicTime OnAlarm() OVERRIDE {
DCHECK(writer_->blocked_writer());
writer_->blocked_writer()->OnCanWrite();
return QuicTime::Zero();
}
private:
PacketDroppingTestWriter* writer_;
};
PacketDroppingTestWriter::PacketDroppingTestWriter()
: clock_(NULL),
blocked_writer_(NULL),
fake_packet_loss_percentage_(0),
fake_blocked_socket_percentage_(0) {
int64 seed = base::RandUint64();
LOG(INFO) << "Seeding packet loss with " << seed;
simple_random_.set_seed(seed);
}
PacketDroppingTestWriter::~PacketDroppingTestWriter() { }
void PacketDroppingTestWriter::SetConnectionHelper(
QuicEpollConnectionHelper* helper) {
clock_ = helper->GetClock();
write_unblocked_alarm_.reset(
helper->CreateAlarm(new WriteUnblockedAlarm(this)));
}
WriteResult PacketDroppingTestWriter::WritePacket(
const char* buffer, size_t buf_len,
const net::IPAddressNumber& self_address,
const net::IPEndPoint& peer_address,
QuicBlockedWriterInterface* blocked_writer) {
if (fake_packet_loss_percentage_ > 0 &&
simple_random_.RandUint64() % 100 < fake_packet_loss_percentage_) {
DLOG(INFO) << "Dropping packet.";
return WriteResult(WRITE_STATUS_OK, buf_len);
}
if (fake_blocked_socket_percentage_ > 0 &&
simple_random_.RandUint64() % 100 < fake_blocked_socket_percentage_) {
DLOG(INFO) << "Blocking socket.";
if (!write_unblocked_alarm_->IsSet()) {
blocked_writer_ = blocked_writer;
// Set the alarm for 1ms in the future.
write_unblocked_alarm_->Set(
clock_->ApproximateNow().Add(
QuicTime::Delta::FromMilliseconds(1)));
}
return WriteResult(WRITE_STATUS_BLOCKED, EAGAIN);
}
return writer()->WritePacket(buffer, buf_len, self_address, peer_address,
blocked_writer);
}
bool PacketDroppingTestWriter::IsWriteBlockedDataBuffered() const {
return false;
}
} // namespace test
} // namespace tools
} // namespace net
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