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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.
// A QuicSession, which demuxes a single connection to individual streams.
#include <cstddef>
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "net/third_party/quiche/src/quic/core/handshaker_delegate_interface.h"
#include "net/third_party/quiche/src/quic/core/legacy_quic_stream_id_manager.h"
#include "net/third_party/quiche/src/quic/core/quic_connection.h"
#include "net/third_party/quiche/src/quic/core/quic_control_frame_manager.h"
#include "net/third_party/quiche/src/quic/core/quic_crypto_stream.h"
#include "net/third_party/quiche/src/quic/core/quic_datagram_queue.h"
#include "net/third_party/quiche/src/quic/core/quic_error_codes.h"
#include "net/third_party/quiche/src/quic/core/quic_packet_creator.h"
#include "net/third_party/quiche/src/quic/core/quic_packets.h"
#include "net/third_party/quiche/src/quic/core/quic_stream.h"
#include "net/third_party/quiche/src/quic/core/quic_stream_frame_data_producer.h"
#include "net/third_party/quiche/src/quic/core/quic_types.h"
#include "net/third_party/quiche/src/quic/core/quic_write_blocked_list.h"
#include "net/third_party/quiche/src/quic/core/session_notifier_interface.h"
#include "net/third_party/quiche/src/quic/core/stream_delegate_interface.h"
#include "net/third_party/quiche/src/quic/core/uber_quic_stream_id_manager.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_containers.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_socket_address.h"
#include "net/third_party/quiche/src/common/platform/api/quiche_optional.h"
#include "net/third_party/quiche/src/common/platform/api/quiche_string_piece.h"
namespace quic {
class QuicCryptoStream;
class QuicFlowController;
class QuicStream;
class QuicStreamIdManager;
namespace test {
class QuicSessionPeer;
} // namespace test
: public QuicConnectionVisitorInterface,
public SessionNotifierInterface,
public QuicStreamFrameDataProducer,
public QuicStreamIdManager::DelegateInterface,
public HandshakerDelegateInterface,
public StreamDelegateInterface,
public QuicControlFrameManager::DelegateInterface {
// An interface from the session to the entity owning the session.
// This lets the session notify its owner (the Dispatcher) when the connection
// is closed, blocked, or added/removed from the time-wait list.
virtual ~Visitor() {}
// Called when the connection is closed after the streams have been closed.
virtual void OnConnectionClosed(QuicConnectionId server_connection_id,
QuicErrorCode error,
const std::string& error_details,
ConnectionCloseSource source) = 0;
// Called when the session has become write blocked.
virtual void OnWriteBlocked(QuicBlockedWriterInterface* blocked_writer) = 0;
// Called when the session receives reset on a stream from the peer.
virtual void OnRstStreamReceived(const QuicRstStreamFrame& frame) = 0;
// Called when the session receives a STOP_SENDING for a stream from the
// peer.
virtual void OnStopSendingReceived(const QuicStopSendingFrame& frame) = 0;
// Does not take ownership of |connection| or |visitor|.
QuicSession(QuicConnection* connection,
Visitor* owner,
const QuicConfig& config,
const ParsedQuicVersionVector& supported_versions,
QuicStreamCount num_expected_unidirectional_static_streams);
QuicSession(const QuicSession&) = delete;
QuicSession& operator=(const QuicSession&) = delete;
~QuicSession() override;
virtual void Initialize();
// QuicConnectionVisitorInterface methods:
void OnStreamFrame(const QuicStreamFrame& frame) override;
void OnCryptoFrame(const QuicCryptoFrame& frame) override;
void OnRstStream(const QuicRstStreamFrame& frame) override;
void OnGoAway(const QuicGoAwayFrame& frame) override;
void OnMessageReceived(quiche::QuicheStringPiece message) override;
void OnHandshakeDoneReceived() override;
void OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame) override;
void OnBlockedFrame(const QuicBlockedFrame& frame) override;
void OnConnectionClosed(const QuicConnectionCloseFrame& frame,
ConnectionCloseSource source) override;
void OnWriteBlocked() override;
void OnSuccessfulVersionNegotiation(
const ParsedQuicVersion& version) override;
void OnPacketReceived(const QuicSocketAddress& self_address,
const QuicSocketAddress& peer_address,
bool is_connectivity_probe) override;
void OnCanWrite() override;
bool SendProbingData() override;
bool ValidateStatelessReset(
const quic::QuicSocketAddress& /*self_address*/,
const quic::QuicSocketAddress& /*peer_address*/) override {
return true;
void OnCongestionWindowChange(QuicTime /*now*/) override {}
void OnConnectionMigration(AddressChangeType /*type*/) override {}
// Adds a connection level WINDOW_UPDATE frame.
void OnAckNeedsRetransmittableFrame() override;
void SendPing() override;
bool WillingAndAbleToWrite() const override;
std::string GetStreamsInfoForLogging() const override;
void OnPathDegrading() override;
void OnForwardProgressMadeAfterPathDegrading() override;
bool AllowSelfAddressChange() const override;
HandshakeState GetHandshakeState() const override;
bool OnMaxStreamsFrame(const QuicMaxStreamsFrame& frame) override;
bool OnStreamsBlockedFrame(const QuicStreamsBlockedFrame& frame) override;
void OnStopSendingFrame(const QuicStopSendingFrame& frame) override;
void OnPacketDecrypted(EncryptionLevel level) override;
void OnOneRttPacketAcknowledged() override;
void OnHandshakePacketSent() override;
// QuicStreamFrameDataProducer
WriteStreamDataResult WriteStreamData(QuicStreamId id,
QuicStreamOffset offset,
QuicByteCount data_length,
QuicDataWriter* writer) override;
bool WriteCryptoData(EncryptionLevel level,
QuicStreamOffset offset,
QuicByteCount data_length,
QuicDataWriter* writer) override;
// SessionNotifierInterface methods:
bool OnFrameAcked(const QuicFrame& frame,
QuicTime::Delta ack_delay_time,
QuicTime receive_timestamp) override;
void OnStreamFrameRetransmitted(const QuicStreamFrame& frame) override;
void OnFrameLost(const QuicFrame& frame) override;
void RetransmitFrames(const QuicFrames& frames,
TransmissionType type) override;
bool IsFrameOutstanding(const QuicFrame& frame) const override;
bool HasUnackedCryptoData() const override;
bool HasUnackedStreamData() const override;
void SendMaxStreams(QuicStreamCount stream_count,
bool unidirectional) override;
// The default implementation does nothing. Subclasses should override if
// for example they queue up stream requests.
virtual void OnCanCreateNewOutgoingStream(bool /*unidirectional*/) {}
// Called on every incoming packet. Passes |packet| through to |connection_|.
virtual void ProcessUdpPacket(const QuicSocketAddress& self_address,
const QuicSocketAddress& peer_address,
const QuicReceivedPacket& packet);
// Called by application to send |message|. Data copy can be avoided if
// |message| is provided in reference counted memory.
// Please note, |message| provided in reference counted memory would be moved
// internally when message is successfully sent. Thereafter, it would be
// undefined behavior if callers try to access the slices through their own
// copy of the span object.
// Returns the message result which includes the message status and message ID
// (valid if the write succeeds). SendMessage flushes a message packet even it
// is not full. If the application wants to bundle other data in the same
// packet, please consider adding a packet flusher around the SendMessage
// and/or WritevData calls.
// OnMessageAcked and OnMessageLost are called when a particular message gets
// acked or lost.
// Note that SendMessage will fail with status = MESSAGE_STATUS_BLOCKED
// if connection is congestion control blocked or underlying socket is write
// blocked. In this case the caller can retry sending message again when
// connection becomes available, for example after getting OnCanWrite()
// callback.
MessageResult SendMessage(QuicMemSliceSpan message);
// Same as above SendMessage, except caller can specify if the given |message|
// should be flushed even if the underlying connection is deemed unwritable.
MessageResult SendMessage(QuicMemSliceSpan message, bool flush);
// Called when message with |message_id| gets acked.
virtual void OnMessageAcked(QuicMessageId message_id,
QuicTime receive_timestamp);
// Called when message with |message_id| is considered as lost.
virtual void OnMessageLost(QuicMessageId message_id);
// QuicControlFrameManager::DelegateInterface
// Close the connection on error.
void OnControlFrameManagerError(QuicErrorCode error_code,
std::string error_details) override;
// Called by control frame manager when it wants to write control frames to
// the peer. Returns true if |frame| is consumed, false otherwise. The frame
// will be sent in specified transmission |type|.
bool WriteControlFrame(const QuicFrame& frame,
TransmissionType type) override;
// Called by stream to send RST_STREAM (and STOP_SENDING in IETF QUIC).
// if |send_rst_only|, STOP_SENDING will not be sent for IETF QUIC.
virtual void SendRstStream(QuicStreamId id,
QuicRstStreamErrorCode error,
QuicStreamOffset bytes_written,
bool send_rst_only);
// Called to send RST_STREAM (and STOP_SENDING) and close stream. If stream
// |id| does not exist, just send RST_STREAM (and STOP_SENDING).
virtual void ResetStream(QuicStreamId id, QuicRstStreamErrorCode error);
// Called when the session wants to go away and not accept any new streams.
virtual void SendGoAway(QuicErrorCode error_code, const std::string& reason);
// Sends a BLOCKED frame.
virtual void SendBlocked(QuicStreamId id);
// Sends a WINDOW_UPDATE frame.
virtual void SendWindowUpdate(QuicStreamId id, QuicStreamOffset byte_offset);
// Create and transmit a STOP_SENDING frame
virtual void SendStopSending(QuicRstStreamErrorCode code,
QuicStreamId stream_id);
// Called by stream |stream_id| when it gets closed.
virtual void OnStreamClosed(QuicStreamId stream_id);
// Returns true if outgoing packets will be encrypted, even if the server
// hasn't confirmed the handshake yet.
virtual bool IsEncryptionEstablished() const;
// Returns true if 1RTT keys are available.
bool OneRttKeysAvailable() const;
// Called by the QuicCryptoStream when a new QuicConfig has been negotiated.
virtual void OnConfigNegotiated();
// From HandshakerDelegateInterface
bool OnNewDecryptionKeyAvailable(EncryptionLevel level,
std::unique_ptr<QuicDecrypter> decrypter,
bool set_alternative_decrypter,
bool latch_once_used) override;
void OnNewEncryptionKeyAvailable(
EncryptionLevel level,
std::unique_ptr<QuicEncrypter> encrypter) override;
void SetDefaultEncryptionLevel(EncryptionLevel level) override;
void OnTlsHandshakeComplete() override;
void DiscardOldDecryptionKey(EncryptionLevel level) override;
void DiscardOldEncryptionKey(EncryptionLevel level) override;
void NeuterUnencryptedData() override;
void NeuterHandshakeData() override;
void OnZeroRttRejected(int reason) override;
bool FillTransportParameters(TransportParameters* params) override;
QuicErrorCode ProcessTransportParameters(const TransportParameters& params,
bool is_resumption,
std::string* error_details) override;
// Implement StreamDelegateInterface.
void OnStreamError(QuicErrorCode error_code,
std::string error_details) override;
// Sets priority in the write blocked list.
void RegisterStreamPriority(
QuicStreamId id,
bool is_static,
const spdy::SpdyStreamPrecedence& precedence) override;
// Clears priority from the write blocked list.
void UnregisterStreamPriority(QuicStreamId id, bool is_static) override;
// Updates priority on the write blocked list.
void UpdateStreamPriority(
QuicStreamId id,
const spdy::SpdyStreamPrecedence& new_precedence) override;
// Called by streams when they want to write data to the peer.
// Returns a pair with the number of bytes consumed from data, and a boolean
// indicating if the fin bit was consumed. This does not indicate the data
// has been sent on the wire: it may have been turned into a packet and queued
// if the socket was unexpectedly blocked.
QuicConsumedData WritevData(
QuicStreamId id,
size_t write_length,
QuicStreamOffset offset,
StreamSendingState state,
TransmissionType type,
quiche::QuicheOptional<EncryptionLevel> level) override;
size_t SendCryptoData(EncryptionLevel level,
size_t write_length,
QuicStreamOffset offset,
TransmissionType type) override;
// Called by the QuicCryptoStream when a handshake message is sent.
virtual void OnCryptoHandshakeMessageSent(
const CryptoHandshakeMessage& message);
// Called by the QuicCryptoStream when a handshake message is received.
virtual void OnCryptoHandshakeMessageReceived(
const CryptoHandshakeMessage& message);
// Returns mutable config for this session. Returned config is owned
// by QuicSession.
QuicConfig* config();
// Returns true if the stream existed previously and has been closed.
// Returns false if the stream is still active or if the stream has
// not yet been created.
bool IsClosedStream(QuicStreamId id);
QuicConnection* connection() { return connection_; }
const QuicConnection* connection() const { return connection_; }
const QuicSocketAddress& peer_address() const {
return connection_->peer_address();
const QuicSocketAddress& self_address() const {
return connection_->self_address();
QuicConnectionId connection_id() const {
return connection_->connection_id();
// Returns the number of currently open streams, excluding static streams, and
// never counting unfinished streams.
size_t GetNumActiveStreams() const;
// Add the stream to the session's write-blocked list because it is blocked by
// connection-level flow control but not by its own stream-level flow control.
// The stream will be given a chance to write when a connection-level
// WINDOW_UPDATE arrives.
virtual void MarkConnectionLevelWriteBlocked(QuicStreamId id);
// Called when stream |id| is done waiting for acks either because all data
// gets acked or is not interested in data being acked (which happens when
// a stream is reset because of an error).
// TODO(b/136274541): rename to CloseZombieStreams.
void OnStreamDoneWaitingForAcks(QuicStreamId id);
// Returns true if there is pending handshake data in the crypto stream.
// TODO(ianswett): Make this private or remove.
bool HasPendingHandshake() const;
// Returns true if the session has data to be sent, either queued in the
// connection, or in a write-blocked stream.
bool HasDataToWrite() const;
// Returns the largest payload that will fit into a single MESSAGE frame.
// Because overhead can vary during a connection, this method should be
// checked for every message.
QuicPacketLength GetCurrentLargestMessagePayload() const;
// Returns the largest payload that will fit into a single MESSAGE frame at
// any point during the connection. This assumes the version and
// connection ID lengths do not change.
QuicPacketLength GetGuaranteedLargestMessagePayload() const;
bool transport_goaway_sent() const { return transport_goaway_sent_; }
bool transport_goaway_received() const { return transport_goaway_received_; }
// Returns the Google QUIC error code
QuicErrorCode error() const { return on_closed_frame_.quic_error_code; }
const std::string& error_details() const {
return on_closed_frame_.error_details;
uint64_t transport_close_frame_type() const {
return on_closed_frame_.transport_close_frame_type;
QuicConnectionCloseType close_type() const {
return on_closed_frame_.close_type;
Perspective perspective() const { return perspective_; }
QuicFlowController* flow_controller() { return &flow_controller_; }
// Returns true if connection is flow controller blocked.
bool IsConnectionFlowControlBlocked() const;
// Returns true if any stream is flow controller blocked.
bool IsStreamFlowControlBlocked();
size_t max_open_incoming_bidirectional_streams() const;
size_t max_open_incoming_unidirectional_streams() const;
size_t MaxAvailableBidirectionalStreams() const;
size_t MaxAvailableUnidirectionalStreams() const;
// Returns existing stream with id = |stream_id|. If no
// such stream exists, and |stream_id| is a peer-created stream id,
// then a new stream is created and returned. In all other cases, nullptr is
// returned.
// Caller does not own the returned stream.
QuicStream* GetOrCreateStream(const QuicStreamId stream_id);
// Mark a stream as draining.
void StreamDraining(QuicStreamId id, bool unidirectional);
// Returns true if this stream should yield writes to another blocked stream.
virtual bool ShouldYield(QuicStreamId stream_id);
// Clean up closed_streams_.
void CleanUpClosedStreams();
const ParsedQuicVersionVector& supported_versions() const {
return supported_versions_;
QuicStreamId next_outgoing_bidirectional_stream_id() const;
QuicStreamId next_outgoing_unidirectional_stream_id() const;
// Return true if given stream is peer initiated.
bool IsIncomingStream(QuicStreamId id) const;
// Record errors when a connection is closed at the server side, should only
// be called from server's perspective.
// Noop if |error| is QUIC_NO_ERROR.
static void RecordConnectionCloseAtServer(QuicErrorCode error,
ConnectionCloseSource source);
inline QuicTransportVersion transport_version() const {
return connection_->transport_version();
inline ParsedQuicVersion version() const { return connection_->version(); }
bool use_http2_priority_write_scheduler() const {
return use_http2_priority_write_scheduler_;
bool is_configured() const { return is_configured_; }
// Called to neuter crypto data of encryption |level|.
void NeuterCryptoDataOfEncryptionLevel(EncryptionLevel level);
// Returns the ALPN values to negotiate on this session.
virtual std::vector<std::string> GetAlpnsToOffer() const {
// TODO(vasilvv): this currently sets HTTP/3 by default. Switch all
// non-HTTP applications to appropriate ALPNs.
return std::vector<std::string>({AlpnForVersion(connection()->version())});
// Provided a list of ALPNs offered by the client, selects an ALPN from the
// list, or alpns.end() if none of the ALPNs are acceptable.
virtual std::vector<quiche::QuicheStringPiece>::const_iterator SelectAlpn(
const std::vector<quiche::QuicheStringPiece>& alpns) const;
// Called when the ALPN of the connection is established for a connection that
// uses TLS handshake.
virtual void OnAlpnSelected(quiche::QuicheStringPiece alpn);
// Called on clients by the crypto handshaker to provide application state
// necessary for sending application data in 0-RTT. The state provided here is
// the same state that was provided to the crypto handshaker in
// QuicCryptoStream::SetServerApplicationStateForResumption on a previous
// connection. Application protocols that require state to be carried over
// from the previous connection to support 0-RTT data must implement this
// method to ingest this state. For example, an HTTP/3 QuicSession would
// implement this function to process the remembered server SETTINGS and apply
// those SETTINGS to 0-RTT data. This function returns true if the application
// state has been successfully processed, and false if there was an error
// processing the cached state and the connection should be closed.
virtual bool ResumeApplicationState(ApplicationState* /*cached_state*/) {
return true;
const quiche::QuicheOptional<std::string> user_agent_id() const {
return user_agent_id_;
void SetUserAgentId(std::string user_agent_id) {
user_agent_id_ = std::move(user_agent_id);
const QuicClock* GetClock() const {
return connection()->helper()->GetClock();
bool liveness_testing_in_progress() const {
return liveness_testing_in_progress_;
bool remove_zombie_streams() const { return remove_zombie_streams_; }
using StreamMap = QuicHashMap<QuicStreamId, std::unique_ptr<QuicStream>>;
using PendingStreamMap =
QuicHashMap<QuicStreamId, std::unique_ptr<PendingStream>>;
using ClosedStreams = std::vector<std::unique_ptr<QuicStream>>;
using ZombieStreamMap =
QuicHashMap<QuicStreamId, std::unique_ptr<QuicStream>>;
// Creates a new stream to handle a peer-initiated stream.
// Caller does not own the returned stream.
// Returns nullptr and does error handling if the stream can not be created.
virtual QuicStream* CreateIncomingStream(QuicStreamId id) = 0;
virtual QuicStream* CreateIncomingStream(PendingStream* pending) = 0;
// Return the reserved crypto stream.
virtual QuicCryptoStream* GetMutableCryptoStream() = 0;
// Return the reserved crypto stream as a constant pointer.
virtual const QuicCryptoStream* GetCryptoStream() const = 0;
// Adds |stream| to the stream map.
virtual void ActivateStream(std::unique_ptr<QuicStream> stream);
// Set transmission type of next sending packets.
void SetTransmissionType(TransmissionType type);
// Returns the stream ID for a new outgoing bidirectional/unidirectional
// stream, and increments the underlying counter.
QuicStreamId GetNextOutgoingBidirectionalStreamId();
QuicStreamId GetNextOutgoingUnidirectionalStreamId();
// Indicates whether the next outgoing bidirectional/unidirectional stream ID
// can be allocated or not. The test for version-99/IETF QUIC is whether it
// will exceed the maximum-stream-id or not. For non-version-99 (Google) QUIC
// it checks whether the next stream would exceed the limit on the number of
// open streams.
bool CanOpenNextOutgoingBidirectionalStream();
bool CanOpenNextOutgoingUnidirectionalStream();
// Returns the maximum bidirectional streams parameter sent with the handshake
// as a transport parameter, or in the most recent MAX_STREAMS frame.
QuicStreamCount GetAdvertisedMaxIncomingBidirectionalStreams() const;
// When a stream is closed locally, it may not yet know how many bytes the
// peer sent on that stream.
// When this data arrives (via stream frame w. FIN, trailing headers, or RST)
// this method is called, and correctly updates the connection level flow
// controller.
virtual void OnFinalByteOffsetReceived(QuicStreamId id,
QuicStreamOffset final_byte_offset);
// Returns true if incoming unidirectional streams should be buffered until
// the first byte of the stream arrives.
// If a subclass returns true here, it should make sure to implement
// ProcessPendingStream().
virtual bool UsesPendingStreams() const { return false; }
spdy::SpdyPriority GetSpdyPriorityofStream(QuicStreamId stream_id) const {
return write_blocked_streams_.GetSpdyPriorityofStream(stream_id);
StreamMap& stream_map() { return stream_map_; }
// TODO(b/136274541): remove this getter and only expose GetNumActiveStreams()
size_t stream_map_size() const { return stream_map_.size(); }
size_t pending_streams_size() const { return pending_stream_map_.size(); }
ClosedStreams* closed_streams() { return &closed_streams_; }
const ZombieStreamMap& zombie_streams() const { return zombie_streams_; }
void set_largest_peer_created_stream_id(
QuicStreamId largest_peer_created_stream_id);
QuicWriteBlockedList* write_blocked_streams() {
return &write_blocked_streams_;
// Returns true if the stream is still active.
bool IsOpenStream(QuicStreamId id);
// Returns true if the stream is a static stream.
bool IsStaticStream(QuicStreamId id) const;
// Close connection when receive a frame for a locally-created nonexistent
// stream.
// Prerequisite: IsClosedStream(stream_id) == false
// Server session might need to override this method to allow server push
// stream to be promised before creating an active stream.
virtual void HandleFrameOnNonexistentOutgoingStream(QuicStreamId stream_id);
virtual bool MaybeIncreaseLargestPeerStreamId(const QuicStreamId stream_id);
void InsertLocallyClosedStreamsHighestOffset(const QuicStreamId id,
QuicStreamOffset offset);
// If stream is a locally closed stream, this RST will update FIN offset.
// Otherwise stream is a preserved stream and the behavior of it depends on
// derived class's own implementation.
virtual void HandleRstOnValidNonexistentStream(
const QuicRstStreamFrame& frame);
// Returns a stateless reset token which will be included in the public reset
// packet.
virtual QuicUint128 GetStatelessResetToken() const;
QuicControlFrameManager& control_frame_manager() {
return control_frame_manager_;
const LegacyQuicStreamIdManager& stream_id_manager() const {
return stream_id_manager_;
QuicDatagramQueue* datagram_queue() { return &datagram_queue_; }
size_t num_static_streams() const { return num_static_streams_; }
size_t num_zombie_streams() const { return num_zombie_streams_; }
bool was_zero_rtt_rejected() const { return was_zero_rtt_rejected_; }
size_t num_outgoing_draining_streams() const {
return num_outgoing_draining_streams_;
// Processes the stream type information of |pending| depending on
// different kinds of sessions' own rules. Returns true if the pending stream
// is converted into a normal stream.
virtual bool ProcessPendingStream(PendingStream* /*pending*/) {
return false;
// Called by applications to perform |action| on active streams.
// Stream iteration will be stopped if action returns false.
void PerformActionOnActiveStreams(std::function<bool(QuicStream*)> action);
void PerformActionOnActiveStreams(
std::function<bool(QuicStream*)> action) const;
// Return the largest peer created stream id depending on directionality
// indicated by |unidirectional|.
QuicStreamId GetLargestPeerCreatedStreamId(bool unidirectional) const;
// Deletes the connection and sets it to nullptr, so calling it mulitiple
// times is safe.
void DeleteConnection();
// Call SetPriority() on stream id |id| and return true if stream is active.
bool MaybeSetStreamPriority(QuicStreamId stream_id,
const spdy::SpdyStreamPrecedence& precedence);
void SetLossDetectionTuner(
std::unique_ptr<LossDetectionTunerInterface> tuner) {
// Find stream with |id|, returns nullptr if the stream does not exist or
// closed. static streams and zombie streams are not considered active
// streams.
QuicStream* GetActiveStream(QuicStreamId id) const;
friend class test::QuicSessionPeer;
// Called in OnConfigNegotiated when we receive a new stream level flow
// control window in a negotiated config. Closes the connection if invalid.
void OnNewStreamFlowControlWindow(QuicStreamOffset new_window);
// Called in OnConfigNegotiated when we receive a new unidirectional stream
// flow control window in a negotiated config.
void OnNewStreamUnidirectionalFlowControlWindow(QuicStreamOffset new_window);
// Called in OnConfigNegotiated when we receive a new outgoing bidirectional
// stream flow control window in a negotiated config.
void OnNewStreamOutgoingBidirectionalFlowControlWindow(
QuicStreamOffset new_window);
// Called in OnConfigNegotiated when we receive a new incoming bidirectional
// stream flow control window in a negotiated config.
void OnNewStreamIncomingBidirectionalFlowControlWindow(
QuicStreamOffset new_window);
// Called in OnConfigNegotiated when we receive a new connection level flow
// control window in a negotiated config. Closes the connection if invalid.
void OnNewSessionFlowControlWindow(QuicStreamOffset new_window);
// Debug helper for |OnCanWrite()|, check that OnStreamWrite() makes
// forward progress. Returns false if busy loop detected.
bool CheckStreamNotBusyLooping(QuicStream* stream,
uint64_t previous_bytes_written,
bool previous_fin_sent);
// Debug helper for OnCanWrite. Check that after QuicStream::OnCanWrite(),
// if stream has buffered data and is not stream level flow control blocked,
// it has to be in the write blocked list.
bool CheckStreamWriteBlocked(QuicStream* stream) const;
// Called in OnConfigNegotiated for Finch trials to measure performance of
// starting with larger flow control receive windows.
void AdjustInitialFlowControlWindows(size_t stream_window);
// Find stream with |id|, returns nullptr if the stream does not exist or
// closed.
QuicStream* GetStream(QuicStreamId id) const;
PendingStream* GetOrCreatePendingStream(QuicStreamId stream_id);
// Let streams and control frame managers retransmit lost data, returns true
// if all lost data is retransmitted. Returns false otherwise.
bool RetransmitLostData();
// Returns true if stream data should be written.
bool CanWriteStreamData() const;
// Closes the pending stream |stream_id| before it has been created.
void ClosePendingStream(QuicStreamId stream_id);
// Creates or gets pending stream, feeds it with |frame|, and processes the
// pending stream.
void PendingStreamOnStreamFrame(const QuicStreamFrame& frame);
// Creates or gets pending strea, feed it with |frame|, and closes the pending
// stream.
void PendingStreamOnRstStream(const QuicRstStreamFrame& frame);
// Does actual work of sending RESET_STREAM, if the stream type allows.
void MaybeSendRstStreamFrame(QuicStreamId id,
QuicRstStreamErrorCode error,
QuicStreamOffset bytes_written);
// Sends a STOP_SENDING frame if the stream type allows.
void MaybeSendStopSendingFrame(QuicStreamId id, QuicRstStreamErrorCode error);
// Keep track of highest received byte offset of locally closed streams, while
// waiting for a definitive final highest offset from the peer.
QuicHashMap<QuicStreamId, QuicStreamOffset>
QuicConnection* connection_;
// Store perspective on QuicSession during the constructor as it may be needed
// during our destructor when connection_ may have already been destroyed.
Perspective perspective_;
// May be null.
Visitor* visitor_;
// A list of streams which need to write more data. Stream register
// themselves in their constructor, and unregisterm themselves in their
// destructors, so the write blocked list must outlive all streams.
QuicWriteBlockedList write_blocked_streams_;
ClosedStreams closed_streams_;
// Streams which are closed, but need to be kept alive. Currently, the only
// reason is the stream's sent data (including FIN) does not get fully acked.
ZombieStreamMap zombie_streams_;
QuicConfig config_;
// Map from StreamId to pointers to streams. Owns the streams.
StreamMap stream_map_;
// Map from StreamId to PendingStreams for peer-created unidirectional streams
// which are waiting for the first byte of payload to arrive.
PendingStreamMap pending_stream_map_;
// TODO(fayang): Consider moving LegacyQuicStreamIdManager into
// UberQuicStreamIdManager.
// Manages stream IDs for Google QUIC.
LegacyQuicStreamIdManager stream_id_manager_;
// Manages stream IDs for version99/IETF QUIC
UberQuicStreamIdManager v99_streamid_manager_;
// A counter for streams which have sent and received FIN but waiting for
// application to consume data.
size_t num_draining_streams_;
// A counter for self initiated streams which have sent and received FIN but
// waiting for application to consume data.
size_t num_outgoing_draining_streams_;
// A counter for static streams which are in stream_map_.
size_t num_static_streams_;
// A counter for streams which have done reading and writing, but are waiting
// for acks.
size_t num_zombie_streams_;
// Received information for a connection close.
QuicConnectionCloseFrame on_closed_frame_;
// Used for connection-level flow control.
QuicFlowController flow_controller_;
// The stream id which was last popped in OnCanWrite, or 0, if not under the
// call stack of OnCanWrite.
QuicStreamId currently_writing_stream_id_;
// Whether a transport layer GOAWAY frame has been sent.
// Such a frame only exists in Google QUIC, therefore |transport_goaway_sent_|
// is always false when using IETF QUIC.
bool transport_goaway_sent_;
// Whether a transport layer GOAWAY frame has been received.
// Such a frame only exists in Google QUIC, therefore
// |transport_goaway_received_| is always false when using IETF QUIC.
bool transport_goaway_received_;
QuicControlFrameManager control_frame_manager_;
// Id of latest successfully sent message.
QuicMessageId last_message_id_;
// The buffer used to queue the DATAGRAM frames.
QuicDatagramQueue datagram_queue_;
// TODO(fayang): switch to linked_hash_set when chromium supports it. The bool
// is not used here.
// List of streams with pending retransmissions.
QuicLinkedHashMap<QuicStreamId, bool> streams_with_pending_retransmission_;
// Clean up closed_streams_ when this alarm fires.
std::unique_ptr<QuicAlarm> closed_streams_clean_up_alarm_;
// Supported version list used by the crypto handshake only. Please note, this
// list may be a superset of the connection framer's supported versions.
ParsedQuicVersionVector supported_versions_;
quiche::QuicheOptional<std::string> user_agent_id_;
// If true, write_blocked_streams_ uses HTTP2 (tree-style) priority write
// scheduler.
bool use_http2_priority_write_scheduler_;
// Initialized to false. Set to true when the session has been properly
// configured and is ready for general operation.
bool is_configured_;
// If true, enables round robin scheduling.
bool enable_round_robin_scheduling_;
// Whether the session has received a 0-RTT rejection (QUIC+TLS only).
bool was_zero_rtt_rejected_;
// This indicates a liveness testing is in progress, and push back the
// creation of new outgoing bidirectional streams.
bool liveness_testing_in_progress_;
// Latched value of flag quic_remove_zombie_streams.
const bool remove_zombie_streams_;
} // namespace quic