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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.
// The base class for streams which deliver data to/from an application.
// In each direction, the data on such a stream first contains compressed
// headers then body data.
#include <sys/types.h>
#include <cstddef>
#include <list>
#include <memory>
#include <string>
#include "absl/base/attributes.h"
#include "absl/strings/string_view.h"
#include "absl/types/span.h"
#include "quiche/quic/core/http/capsule.h"
#include "quiche/quic/core/http/http_decoder.h"
#include "quiche/quic/core/http/http_encoder.h"
#include "quiche/quic/core/http/quic_header_list.h"
#include "quiche/quic/core/http/quic_spdy_stream_body_manager.h"
#include "quiche/quic/core/http/web_transport_stream_adapter.h"
#include "quiche/quic/core/qpack/qpack_decoded_headers_accumulator.h"
#include "quiche/quic/core/quic_error_codes.h"
#include "quiche/quic/core/quic_packets.h"
#include "quiche/quic/core/quic_stream.h"
#include "quiche/quic/core/quic_stream_sequencer.h"
#include "quiche/quic/core/quic_types.h"
#include "quiche/quic/core/web_transport_interface.h"
#include "quiche/quic/platform/api/quic_export.h"
#include "quiche/quic/platform/api/quic_flags.h"
#include "quiche/quic/platform/api/quic_socket_address.h"
#include "quiche/common/platform/api/quiche_mem_slice.h"
#include "quiche/spdy/core/http2_header_block.h"
#include "quiche/spdy/core/spdy_framer.h"
namespace quic {
namespace test {
class QuicSpdyStreamPeer;
class QuicStreamPeer;
} // namespace test
class QuicSpdySession;
class WebTransportHttp3;
// A QUIC stream that can send and receive HTTP2 (SPDY) headers.
class QUIC_EXPORT_PRIVATE QuicSpdyStream
: public QuicStream,
public CapsuleParser::Visitor,
public QpackDecodedHeadersAccumulator::Visitor {
// Visitor receives callbacks from the stream.
Visitor() {}
Visitor(const Visitor&) = delete;
Visitor& operator=(const Visitor&) = delete;
// Called when the stream is closed.
virtual void OnClose(QuicSpdyStream* stream) = 0;
// Allows subclasses to override and do work.
virtual void OnPromiseHeadersComplete(QuicStreamId /*promised_id*/,
size_t /*frame_len*/) {}
virtual ~Visitor() {}
QuicSpdyStream(QuicStreamId id, QuicSpdySession* spdy_session,
StreamType type);
QuicSpdyStream(PendingStream* pending, QuicSpdySession* spdy_session);
QuicSpdyStream(const QuicSpdyStream&) = delete;
QuicSpdyStream& operator=(const QuicSpdyStream&) = delete;
~QuicSpdyStream() override;
// QuicStream implementation
void OnClose() override;
// Override to maybe close the write side after writing.
void OnCanWrite() override;
// Called by the session when headers with a priority have been received
// for this stream. This method will only be called for server streams.
virtual void OnStreamHeadersPriority(
const spdy::SpdyStreamPrecedence& precedence);
// Called by the session when decompressed headers have been completely
// delivered to this stream. If |fin| is true, then this stream
// should be closed; no more data will be sent by the peer.
virtual void OnStreamHeaderList(bool fin, size_t frame_len,
const QuicHeaderList& header_list);
// Called by the session when decompressed push promise headers have
// been completely delivered to this stream.
virtual void OnPromiseHeaderList(QuicStreamId promised_id, size_t frame_len,
const QuicHeaderList& header_list);
// Called by the session when a PRIORITY frame has been been received for this
// stream. This method will only be called for server streams.
void OnPriorityFrame(const spdy::SpdyStreamPrecedence& precedence);
// Override the base class to not discard response when receiving
void OnStreamReset(const QuicRstStreamFrame& frame) override;
void ResetWithError(QuicResetStreamError error) override;
bool OnStopSending(QuicResetStreamError error) override;
// Called by the sequencer when new data is available. Decodes the data and
// calls OnBodyAvailable() to pass to the upper layer.
void OnDataAvailable() override;
// Called in OnDataAvailable() after it finishes the decoding job.
virtual void OnBodyAvailable() = 0;
// Writes the headers contained in |header_block| on the dedicated headers
// stream or on this stream, depending on VersionUsesHttp3(). Returns the
// number of bytes sent, including data sent on the encoder stream when using
virtual size_t WriteHeaders(
spdy::Http2HeaderBlock header_block, bool fin,
// Sends |data| to the peer, or buffers if it can't be sent immediately.
virtual void WriteOrBufferBody(absl::string_view data, bool fin);
// Writes the trailers contained in |trailer_block| on the dedicated headers
// stream or on this stream, depending on VersionUsesHttp3(). Trailers will
// always have the FIN flag set. Returns the number of bytes sent, including
// data sent on the encoder stream when using QPACK.
virtual size_t WriteTrailers(
spdy::Http2HeaderBlock trailer_block,
// Override to report newly acked bytes via ack_listener_.
bool OnStreamFrameAcked(QuicStreamOffset offset, QuicByteCount data_length,
bool fin_acked, QuicTime::Delta ack_delay_time,
QuicTime receive_timestamp,
QuicByteCount* newly_acked_length) override;
// Override to report bytes retransmitted via ack_listener_.
void OnStreamFrameRetransmitted(QuicStreamOffset offset,
QuicByteCount data_length,
bool fin_retransmitted) override;
// Does the same thing as WriteOrBufferBody except this method takes iovec
// as the data input. Right now it only calls WritevData.
QuicConsumedData WritevBody(const struct iovec* iov, int count, bool fin);
// Does the same thing as WriteOrBufferBody except this method takes
// memslicespan as the data input. Right now it only calls WriteMemSlices.
QuicConsumedData WriteBodySlices(absl::Span<quiche::QuicheMemSlice> slices,
bool fin);
// Marks the trailers as consumed. This applies to the case where this object
// receives headers and trailers as QuicHeaderLists via calls to
// OnStreamHeaderList(). Trailer data will be consumed from the sequencer only
// once all body data has been consumed.
void MarkTrailersConsumed();
// Clears |header_list_|.
void ConsumeHeaderList();
// This block of functions wraps the sequencer's functions of the same
// name. These methods return uncompressed data until that has
// been fully processed. Then they simply delegate to the sequencer.
virtual size_t Readv(const struct iovec* iov, size_t iov_len);
virtual int GetReadableRegions(iovec* iov, size_t iov_len) const;
void MarkConsumed(size_t num_bytes);
// Returns true if header contains a valid 3-digit status and parse the status
// code to |status_code|.
static bool ParseHeaderStatusCode(const spdy::Http2HeaderBlock& header,
int* status_code);
// Returns true when all data from the peer has been read and consumed,
// including the fin.
bool IsDoneReading() const;
bool HasBytesToRead() const;
void set_visitor(Visitor* visitor) { visitor_ = visitor; }
bool headers_decompressed() const { return headers_decompressed_; }
// Returns total amount of body bytes that have been read.
uint64_t total_body_bytes_read() const;
const QuicHeaderList& header_list() const { return header_list_; }
bool trailers_decompressed() const { return trailers_decompressed_; }
// Returns whatever trailers have been received for this stream.
const spdy::Http2HeaderBlock& received_trailers() const {
return received_trailers_;
// Returns true if headers have been fully read and consumed.
bool FinishedReadingHeaders() const;
// Returns true if FIN has been received and either trailers have been fully
// read and consumed or there are no trailers.
bool FinishedReadingTrailers() const;
// Returns true if the sequencer has delivered the FIN, and no more body bytes
// will be available.
bool IsSequencerClosed() { return sequencer()->IsClosed(); }
// QpackDecodedHeadersAccumulator::Visitor implementation.
void OnHeadersDecoded(QuicHeaderList headers,
bool header_list_size_limit_exceeded) override;
void OnHeaderDecodingError(QuicErrorCode error_code,
absl::string_view error_message) override;
QuicSpdySession* spdy_session() const { return spdy_session_; }
// Send PRIORITY_UPDATE frame and update |last_sent_urgency_| if
// |last_sent_urgency_| is different from current priority.
void MaybeSendPriorityUpdateFrame() override;
// Returns the WebTransport session owned by this stream, if one exists.
WebTransportHttp3* web_transport() { return web_transport_.get(); }
// Returns the WebTransport data stream associated with this QUIC stream, or
// null if this is not a WebTransport data stream.
WebTransportStream* web_transport_stream() {
if (web_transport_data_ == nullptr) {
return nullptr;
return &web_transport_data_->adapter;
// Sends a WEBTRANSPORT_STREAM frame and sets up the appropriate metadata.
void ConvertToWebTransportDataStream(WebTransportSessionId session_id);
void OnCanWriteNewData() override;
// If this stream is a WebTransport data stream, closes the connection with an
// error, and returns false.
bool AssertNotWebTransportDataStream(absl::string_view operation);
// Indicates whether a call to WriteBodySlices will be successful and not
// rejected due to buffer being full. |write_size| must be non-zero.
bool CanWriteNewBodyData(QuicByteCount write_size) const;
// From CapsuleParser::Visitor.
bool OnCapsule(const Capsule& capsule) override;
void OnCapsuleParseFailure(const std::string& error_message) override;
// Sends an HTTP/3 datagram. The stream ID is not part of |payload|.
MessageStatus SendHttp3Datagram(absl::string_view payload);
class QUIC_EXPORT_PRIVATE Http3DatagramVisitor {
virtual ~Http3DatagramVisitor() {}
// Called when an HTTP/3 datagram is received. |payload| does not contain
// the stream ID.
virtual void OnHttp3Datagram(QuicStreamId stream_id,
absl::string_view payload) = 0;
// Registers |visitor| to receive HTTP/3 datagrams. |visitor| must be
// valid until a corresponding call to UnregisterHttp3DatagramVisitor.
void RegisterHttp3DatagramVisitor(Http3DatagramVisitor* visitor);
// Unregisters an HTTP/3 datagram visitor. Must only be called after a call to
// RegisterHttp3DatagramVisitor.
void UnregisterHttp3DatagramVisitor();
// Replaces the current HTTP/3 datagram visitor with a different visitor.
// Mainly meant to be used by the visitors' move operators.
void ReplaceHttp3DatagramVisitor(Http3DatagramVisitor* visitor);
// Sets max datagram time in queue.
void SetMaxDatagramTimeInQueue(QuicTime::Delta max_time_in_queue);
void OnDatagramReceived(QuicDataReader* reader);
QuicByteCount GetMaxDatagramSize() const;
// Writes |capsule| onto the DATA stream.
void WriteCapsule(const Capsule& capsule, bool fin = false);
void WriteGreaseCapsule();
// Called when the received headers are too large. By default this will
// reset the stream.
virtual void OnHeadersTooLarge();
virtual void OnInitialHeadersComplete(bool fin, size_t frame_len,
const QuicHeaderList& header_list);
virtual void OnTrailingHeadersComplete(bool fin, size_t frame_len,
const QuicHeaderList& header_list);
virtual size_t WriteHeadersImpl(
spdy::Http2HeaderBlock header_block, bool fin,
Visitor* visitor() { return visitor_; }
void set_headers_decompressed(bool val) { headers_decompressed_ = val; }
void set_ack_listener(
ack_listener) {
ack_listener_ = std::move(ack_listener);
void OnWriteSideInDataRecvdState() override;
virtual bool AreHeadersValid(const QuicHeaderList& header_list) const;
// TODO(b/202433856) Merge AreHeaderFieldValueValid into AreHeadersValid once
// all flags guarding the behavior of AreHeadersValid has been rolled out.
virtual bool AreHeaderFieldValuesValid(
const QuicHeaderList& header_list) const;
// Reset stream upon invalid request headers.
virtual void OnInvalidHeaders();
friend class test::QuicSpdyStreamPeer;
friend class test::QuicStreamPeer;
friend class QuicStreamUtils;
class HttpDecoderVisitor;
struct QUIC_EXPORT_PRIVATE WebTransportDataStream {
WebTransportDataStream(QuicSpdyStream* stream,
WebTransportSessionId session_id);
WebTransportSessionId session_id;
WebTransportStreamAdapter adapter;
// Called by HttpDecoderVisitor.
bool OnDataFrameStart(QuicByteCount header_length,
QuicByteCount payload_length);
bool OnDataFramePayload(absl::string_view payload);
bool OnDataFrameEnd();
bool OnHeadersFrameStart(QuicByteCount header_length,
QuicByteCount payload_length);
bool OnHeadersFramePayload(absl::string_view payload);
bool OnHeadersFrameEnd();
void OnWebTransportStreamFrameType(QuicByteCount header_length,
WebTransportSessionId session_id);
bool OnUnknownFrameStart(uint64_t frame_type, QuicByteCount header_length,
QuicByteCount payload_length);
bool OnUnknownFramePayload(absl::string_view payload);
bool OnUnknownFrameEnd();
// Given the interval marked by [|offset|, |offset| + |data_length|), return
// the number of frame header bytes contained in it.
QuicByteCount GetNumFrameHeadersInInterval(QuicStreamOffset offset,
QuicByteCount data_length) const;
void MaybeProcessSentWebTransportHeaders(spdy::Http2HeaderBlock& headers);
void MaybeProcessReceivedWebTransportHeaders();
// Writes HTTP/3 DATA frame header. If |force_write| is true, use
// WriteOrBufferData if send buffer cannot accomodate the header + data.
ABSL_MUST_USE_RESULT bool WriteDataFrameHeader(QuicByteCount data_length,
bool force_write);
// Simply calls OnBodyAvailable() unless capsules are in use, in which case
// pass the capsule fragments to the capsule manager.
void HandleBodyAvailable();
// Called when a datagram frame or capsule is received.
void HandleReceivedDatagram(absl::string_view payload);
QuicSpdySession* spdy_session_;
bool on_body_available_called_because_sequencer_is_closed_;
Visitor* visitor_;
// True if read side processing is blocked while waiting for callback from
// QPACK decoder.
bool blocked_on_decoding_headers_;
// True if the headers have been completely decompressed.
bool headers_decompressed_;
// True if uncompressed headers or trailers exceed maximum allowed size
// advertised to peer via SETTINGS_MAX_HEADER_LIST_SIZE.
bool header_list_size_limit_exceeded_;
// Contains a copy of the decompressed header (name, value) pairs until they
// are consumed via Readv.
QuicHeaderList header_list_;
// Length of most recently received HEADERS frame payload.
QuicByteCount headers_payload_length_;
// True if the trailers have been completely decompressed.
bool trailers_decompressed_;
// True if the trailers have been consumed.
bool trailers_consumed_;
// The parsed trailers received from the peer.
spdy::Http2HeaderBlock received_trailers_;
// Headers accumulator for decoding HEADERS frame payload.
// Visitor of the HttpDecoder.
std::unique_ptr<HttpDecoderVisitor> http_decoder_visitor_;
// HttpDecoder for processing raw incoming stream frames.
HttpDecoder decoder_;
// Object that manages references to DATA frame payload fragments buffered by
// the sequencer and calculates how much data should be marked consumed with
// the sequencer each time new stream data is processed.
QuicSpdyStreamBodyManager body_manager_;
std::unique_ptr<CapsuleParser> capsule_parser_;
// Sequencer offset keeping track of how much data HttpDecoder has processed.
// Initial value is zero for fresh streams, or sequencer()->NumBytesConsumed()
// at time of construction if a PendingStream is converted to account for the
// length of the unidirectional stream type at the beginning of the stream.
QuicStreamOffset sequencer_offset_;
// True when inside an HttpDecoder::ProcessInput() call.
// Used for detecting reentrancy.
bool is_decoder_processing_input_;
// Ack listener of this stream, and it is notified when any of written bytes
// are acked or retransmitted.
quiche::QuicheReferenceCountedPointer<QuicAckListenerInterface> ack_listener_;
// Offset of unacked frame headers.
QuicIntervalSet<QuicStreamOffset> unacked_frame_headers_offsets_;
// Urgency value sent in the last PRIORITY_UPDATE frame, or default urgency
// defined by the spec if no PRIORITY_UPDATE frame has been sent.
int last_sent_urgency_;
// If this stream is a WebTransport extended CONNECT stream, contains the
// WebTransport session associated with this stream.
std::unique_ptr<WebTransportHttp3> web_transport_;
// If this stream is a WebTransport data stream, |web_transport_data_|
// contains all of the associated metadata.
std::unique_ptr<WebTransportDataStream> web_transport_data_;
// HTTP/3 Datagram support.
Http3DatagramVisitor* datagram_visitor_ = nullptr;
} // namespace quic