Move shared files in net/quic/ into net/quic/core/

net/quic/quic_unacked_packet_map.cc

-// Copyright 2014 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_unacked_packet_map.h"
-
-#include "base/logging.h"
-#include "base/stl_util.h"
-#include "net/quic/chromium/quic_utils_chromium.h"
-#include "net/quic/quic_bug_tracker.h"
-#include "net/quic/quic_connection_stats.h"
-#include "net/quic/quic_flags.h"
-#include "net/quic/quic_utils.h"
-
-using std::max;
-
-namespace net {
-
-QuicUnackedPacketMap::QuicUnackedPacketMap()
-    : largest_sent_packet_(0),
-      largest_observed_(0),
-      least_unacked_(1),
-      bytes_in_flight_(0),
-      pending_crypto_packet_count_(0) {}
-
-QuicUnackedPacketMap::~QuicUnackedPacketMap() {
-  QuicPacketNumber index = least_unacked_;
-  for (UnackedPacketMap::iterator it = unacked_packets_.begin();
-       it != unacked_packets_.end(); ++it, ++index) {
-    QuicUtils::DeleteFrames(&it->retransmittable_frames);
-  }
-}
-
-void QuicUnackedPacketMap::AddSentPacket(SerializedPacket* packet,
-                                         QuicPacketNumber old_packet_number,
-                                         TransmissionType transmission_type,
-                                         QuicTime sent_time,
-                                         bool set_in_flight) {
-  QuicPacketNumber packet_number = packet->packet_number;
-  QuicPacketLength bytes_sent = packet->encrypted_length;
-  QUIC_BUG_IF(largest_sent_packet_ >= packet_number) << packet_number;
-  DCHECK_GE(packet_number, least_unacked_ + unacked_packets_.size());
-  while (least_unacked_ + unacked_packets_.size() < packet_number) {
-    unacked_packets_.push_back(TransmissionInfo());
-    unacked_packets_.back().is_unackable = true;
-  }
-
-  const bool has_crypto_handshake =
-      packet->has_crypto_handshake == IS_HANDSHAKE;
-  TransmissionInfo info(packet->encryption_level, packet->packet_number_length,
-                        transmission_type, sent_time, bytes_sent,
-                        has_crypto_handshake, packet->num_padding_bytes);
-  if (old_packet_number > 0) {
-    TransferRetransmissionInfo(old_packet_number, packet_number,
-                               transmission_type, &info);
-  }
-
-  largest_sent_packet_ = packet_number;
-  if (set_in_flight) {
-    bytes_in_flight_ += bytes_sent;
-    info.in_flight = true;
-  }
-  unacked_packets_.push_back(info);
-  // Swap the ack listeners and retransmittable frames to avoid allocations.
-  // TODO(ianswett): Could use emplace_back when Chromium can.
-  if (old_packet_number == 0) {
-    if (has_crypto_handshake) {
-      ++pending_crypto_packet_count_;
-    }
-
-    packet->retransmittable_frames.swap(
-        unacked_packets_.back().retransmittable_frames);
-    unacked_packets_.back().ack_listeners.swap(packet->listeners);
-  }
-}
-
-void QuicUnackedPacketMap::RemoveObsoletePackets() {
-  while (!unacked_packets_.empty()) {
-    if (!IsPacketUseless(least_unacked_, unacked_packets_.front())) {
-      break;
-    }
-
-    unacked_packets_.pop_front();
-    ++least_unacked_;
-  }
-}
-
-void QuicUnackedPacketMap::TransferRetransmissionInfo(
-    QuicPacketNumber old_packet_number,
-    QuicPacketNumber new_packet_number,
-    TransmissionType transmission_type,
-    TransmissionInfo* info) {
-  if (old_packet_number < least_unacked_) {
-    // This can happen when a retransmission packet is queued because of write
-    // blocked socket, and the original packet gets acked before the
-    // retransmission gets sent.
-    return;
-  }
-  if (old_packet_number > largest_sent_packet_) {
-    QUIC_BUG << "Old TransmissionInfo never existed for :" << old_packet_number
-             << " largest_sent:" << largest_sent_packet_;
-    return;
-  }
-  DCHECK_GE(new_packet_number, least_unacked_ + unacked_packets_.size());
-  DCHECK_NE(NOT_RETRANSMISSION, transmission_type);
-
-  TransmissionInfo* transmission_info =
-      &unacked_packets_.at(old_packet_number - least_unacked_);
-  QuicFrames* frames = &transmission_info->retransmittable_frames;
-  for (AckListenerWrapper& wrapper : transmission_info->ack_listeners) {
-    wrapper.ack_listener->OnPacketRetransmitted(wrapper.length);
-  }
-
-  // Swap the frames and preserve num_padding_bytes and has_crypto_handshake.
-  frames->swap(info->retransmittable_frames);
-  info->has_crypto_handshake = transmission_info->has_crypto_handshake;
-  transmission_info->has_crypto_handshake = false;
-  info->num_padding_bytes = transmission_info->num_padding_bytes;
-
-  // Transfer the AckListeners if any are present.
-  info->ack_listeners.swap(transmission_info->ack_listeners);
-  QUIC_BUG_IF(frames == nullptr)
-      << "Attempt to retransmit packet with no "
-      << "retransmittable frames: " << old_packet_number;
-
-  // Don't link old transmissions to new ones when version or
-  // encryption changes.
-  if (transmission_type == ALL_INITIAL_RETRANSMISSION ||
-      transmission_type == ALL_UNACKED_RETRANSMISSION) {
-    transmission_info->is_unackable = true;
-  } else {
-    transmission_info->retransmission = new_packet_number;
-  }
-  // Proactively remove obsolete packets so the least unacked can be raised.
-  RemoveObsoletePackets();
-}
-
-bool QuicUnackedPacketMap::HasRetransmittableFrames(
-    QuicPacketNumber packet_number) const {
-  DCHECK_GE(packet_number, least_unacked_);
-  DCHECK_LT(packet_number, least_unacked_ + unacked_packets_.size());
-  return !unacked_packets_[packet_number - least_unacked_]
-              .retransmittable_frames.empty();
-}
-
-void QuicUnackedPacketMap::RemoveRetransmittability(TransmissionInfo* info) {
-  while (info->retransmission != 0) {
-    const QuicPacketNumber retransmission = info->retransmission;
-    info->retransmission = 0;
-    info = &unacked_packets_[retransmission - least_unacked_];
-  }
-  MaybeRemoveRetransmittableFrames(info);
-}
-
-void QuicUnackedPacketMap::RemoveRetransmittability(
-    QuicPacketNumber packet_number) {
-  DCHECK_GE(packet_number, least_unacked_);
-  DCHECK_LT(packet_number, least_unacked_ + unacked_packets_.size());
-  TransmissionInfo* info = &unacked_packets_[packet_number - least_unacked_];
-  RemoveRetransmittability(info);
-}
-
-void QuicUnackedPacketMap::MaybeRemoveRetransmittableFrames(
-    TransmissionInfo* transmission_info) {
-  if (transmission_info->has_crypto_handshake) {
-    DCHECK(!transmission_info->retransmittable_frames.empty());
-    DCHECK_LT(0u, pending_crypto_packet_count_);
-    --pending_crypto_packet_count_;
-    transmission_info->has_crypto_handshake = false;
-  }
-  QuicUtils::DeleteFrames(&transmission_info->retransmittable_frames);
-}
-
-void QuicUnackedPacketMap::IncreaseLargestObserved(
-    QuicPacketNumber largest_observed) {
-  DCHECK_LE(largest_observed_, largest_observed);
-  largest_observed_ = largest_observed;
-}
-
-bool QuicUnackedPacketMap::IsPacketUsefulForMeasuringRtt(
-    QuicPacketNumber packet_number,
-    const TransmissionInfo& info) const {
-  // Packet can be used for RTT measurement if it may yet be acked as the
-  // largest observed packet by the receiver.
-  return !info.is_unackable && packet_number > largest_observed_;
-}
-
-bool QuicUnackedPacketMap::IsPacketUsefulForCongestionControl(
-    const TransmissionInfo& info) const {
-  // Packet contributes to congestion control if it is considered inflight.
-  return info.in_flight;
-}
-
-bool QuicUnackedPacketMap::IsPacketUsefulForRetransmittableData(
-    const TransmissionInfo& info) const {
-  // Packet may have retransmittable frames, or the data may have been
-  // retransmitted with a new packet number.
-  return !info.retransmittable_frames.empty() ||
-         // Allow for an extra 1 RTT before stopping to track old packets.
-         info.retransmission > largest_observed_;
-}
-
-bool QuicUnackedPacketMap::IsPacketUseless(QuicPacketNumber packet_number,
-                                           const TransmissionInfo& info) const {
-  return !IsPacketUsefulForMeasuringRtt(packet_number, info) &&
-         !IsPacketUsefulForCongestionControl(info) &&
-         !IsPacketUsefulForRetransmittableData(info);
-}
-
-bool QuicUnackedPacketMap::IsUnacked(QuicPacketNumber packet_number) const {
-  if (packet_number < least_unacked_ ||
-      packet_number >= least_unacked_ + unacked_packets_.size()) {
-    return false;
-  }
-  return !IsPacketUseless(packet_number,
-                          unacked_packets_[packet_number - least_unacked_]);
-}
-
-void QuicUnackedPacketMap::NotifyAndClearListeners(
-    std::list<AckListenerWrapper>* ack_listeners,
-    QuicTime::Delta ack_delay_time) {
-  for (const AckListenerWrapper& wrapper : *ack_listeners) {
-    wrapper.ack_listener->OnPacketAcked(wrapper.length, ack_delay_time);
-  }
-  ack_listeners->clear();
-}
-
-void QuicUnackedPacketMap::NotifyAndClearListeners(
-    QuicPacketNumber packet_number,
-    QuicTime::Delta ack_delay_time) {
-  DCHECK_GE(packet_number, least_unacked_);
-  DCHECK_LT(packet_number, least_unacked_ + unacked_packets_.size());
-  TransmissionInfo* info = &unacked_packets_[packet_number - least_unacked_];
-  NotifyAndClearListeners(&info->ack_listeners, ack_delay_time);
-}
-
-void QuicUnackedPacketMap::RemoveFromInFlight(TransmissionInfo* info) {
-  if (info->in_flight) {
-    QUIC_BUG_IF(bytes_in_flight_ < info->bytes_sent);
-    bytes_in_flight_ -= info->bytes_sent;
-    info->in_flight = false;
-  }
-}
-
-void QuicUnackedPacketMap::RemoveFromInFlight(QuicPacketNumber packet_number) {
-  DCHECK_GE(packet_number, least_unacked_);
-  DCHECK_LT(packet_number, least_unacked_ + unacked_packets_.size());
-  TransmissionInfo* info = &unacked_packets_[packet_number - least_unacked_];
-  RemoveFromInFlight(info);
-}
-
-void QuicUnackedPacketMap::RestoreToInFlight(QuicPacketNumber packet_number) {
-  DCHECK_GE(packet_number, least_unacked_);
-  DCHECK_LT(packet_number, least_unacked_ + unacked_packets_.size());
-  TransmissionInfo* info = &unacked_packets_[packet_number - least_unacked_];
-  DCHECK(!info->is_unackable);
-  bytes_in_flight_ += info->bytes_sent;
-  info->in_flight = true;
-}
-
-void QuicUnackedPacketMap::CancelRetransmissionsForStream(
-    QuicStreamId stream_id) {
-  QuicPacketNumber packet_number = least_unacked_;
-  for (UnackedPacketMap::iterator it = unacked_packets_.begin();
-       it != unacked_packets_.end(); ++it, ++packet_number) {
-    QuicFrames* frames = &it->retransmittable_frames;
-    if (frames->empty()) {
-      continue;
-    }
-    QuicUtils::RemoveFramesForStream(frames, stream_id);
-    if (frames->empty()) {
-      RemoveRetransmittability(packet_number);
-    }
-  }
-}
-
-bool QuicUnackedPacketMap::HasUnackedPackets() const {
-  return !unacked_packets_.empty();
-}
-
-bool QuicUnackedPacketMap::HasInFlightPackets() const {
-  return bytes_in_flight_ > 0;
-}
-
-const TransmissionInfo& QuicUnackedPacketMap::GetTransmissionInfo(
-    QuicPacketNumber packet_number) const {
-  return unacked_packets_[packet_number - least_unacked_];
-}
-
-TransmissionInfo* QuicUnackedPacketMap::GetMutableTransmissionInfo(
-    QuicPacketNumber packet_number) {
-  return &unacked_packets_[packet_number - least_unacked_];
-}
-
-QuicTime QuicUnackedPacketMap::GetLastPacketSentTime() const {
-  UnackedPacketMap::const_reverse_iterator it = unacked_packets_.rbegin();
-  while (it != unacked_packets_.rend()) {
-    if (it->in_flight) {
-      QUIC_BUG_IF(it->sent_time == QuicTime::Zero())
-          << "Sent time can never be zero for a packet in flight.";
-      return it->sent_time;
-    }
-    ++it;
-  }
-  QUIC_BUG << "GetLastPacketSentTime requires in flight packets.";
-  return QuicTime::Zero();
-}
-
-size_t QuicUnackedPacketMap::GetNumUnackedPacketsDebugOnly() const {
-  size_t unacked_packet_count = 0;
-  QuicPacketNumber packet_number = least_unacked_;
-  for (UnackedPacketMap::const_iterator it = unacked_packets_.begin();
-       it != unacked_packets_.end(); ++it, ++packet_number) {
-    if (!IsPacketUseless(packet_number, *it)) {
-      ++unacked_packet_count;
-    }
-  }
-  return unacked_packet_count;
-}
-
-bool QuicUnackedPacketMap::HasMultipleInFlightPackets() const {
-  if (bytes_in_flight_ > kDefaultTCPMSS) {
-    return true;
-  }
-  size_t num_in_flight = 0;
-  for (UnackedPacketMap::const_reverse_iterator it = unacked_packets_.rbegin();
-       it != unacked_packets_.rend(); ++it) {
-    if (it->in_flight) {
-      ++num_in_flight;
-    }
-    if (num_in_flight > 1) {
-      return true;
-    }
-  }
-  return false;
-}
-
-bool QuicUnackedPacketMap::HasPendingCryptoPackets() const {
-  return pending_crypto_packet_count_ > 0;
-}
-
-bool QuicUnackedPacketMap::HasUnackedRetransmittableFrames() const {
-  for (UnackedPacketMap::const_reverse_iterator it = unacked_packets_.rbegin();
-       it != unacked_packets_.rend(); ++it) {
-    if (it->in_flight && !it->retransmittable_frames.empty()) {
-      return true;
-    }
-  }
-  return false;
-}
-
-QuicPacketNumber QuicUnackedPacketMap::GetLeastUnacked() const {
-  return least_unacked_;
-}
-
-}  // namespace net