/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_net_Http2Session_h

#define mozilla_net_Http2Session_h

// HTTP/2 - RFC 7540

// https://www.rfc-editor.org/rfc/rfc7540.txt

#include "ASpdySession.h"

#include "mozilla/Attributes.h"

#include "mozilla/UniquePtr.h"

#include "mozilla/WeakPtr.h"

#include "nsAHttpConnection.h"

#include "nsClassHashtable.h"

#include "nsDataHashtable.h"

#include "nsDeque.h"

#include "nsHashKeys.h"

#include "nsHttpRequestHead.h"

#include "nsICacheEntryOpenCallback.h"

#include "Http2Compression.h"

class nsISocketTransport;

namespace mozilla {

namespace net {

class Http2PushedStream;

class Http2Stream;

class nsHttpTransaction;

class Http2Session final : public ASpdySession

                         , public nsAHttpConnection

                         , public nsAHttpSegmentReader

                         , public nsAHttpSegmentWriter

{

  ~Http2Session();

public:

  NS_DECL_THREADSAFE_ISUPPORTS

  NS_DECL_NSAHTTPTRANSACTION

  NS_DECL_NSAHTTPCONNECTION(mConnection)

  NS_DECL_NSAHTTPSEGMENTREADER

  NS_DECL_NSAHTTPSEGMENTWRITER

  Http2Session(nsISocketTransport *, enum SpdyVersion version, bool attemptingEarlyData);

  MOZ_MUST_USE bool AddStream(nsAHttpTransaction *, int32_t,

                              bool, nsIInterfaceRequestor *) override;

  bool CanReuse() override { return !mShouldGoAway && !mClosed; }

  bool RoomForMoreStreams() override;

  enum SpdyVersion SpdyVersion() override;

  bool TestJoinConnection(const nsACString &hostname, int32_t port) override;

  bool JoinConnection(const nsACString &hostname, int32_t port) override;

  // When the connection is active this is called up to once every 1 second

  // return the interval (in seconds) that the connection next wants to

  // have this invoked. It might happen sooner depending on the needs of

  // other connections.

  uint32_t  ReadTimeoutTick(PRIntervalTime now) override;

  // Idle time represents time since "goodput".. e.g. a data or header frame

  PRIntervalTime IdleTime() override;

  // Registering with a newID of 0 means pick the next available odd ID

  uint32_t RegisterStreamID(Http2Stream *, uint32_t aNewID = 0);

/*

  HTTP/2 framing

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  |         Length (16)           |   Type (8)    |   Flags (8)   |

  +-+-------------+---------------+-------------------------------+

  |R|                 Stream Identifier (31)                      |

  +-+-------------------------------------------------------------+

  |                     Frame Data (0...)                       ...

  +---------------------------------------------------------------+

*/

  enum FrameType {

    FRAME_TYPE_DATA          = 0x0,

    FRAME_TYPE_HEADERS       = 0x1,

    FRAME_TYPE_PRIORITY      = 0x2,

    FRAME_TYPE_RST_STREAM    = 0x3,

    FRAME_TYPE_SETTINGS      = 0x4,

    FRAME_TYPE_PUSH_PROMISE  = 0x5,

    FRAME_TYPE_PING          = 0x6,

    FRAME_TYPE_GOAWAY        = 0x7,

    FRAME_TYPE_WINDOW_UPDATE = 0x8,

    FRAME_TYPE_CONTINUATION  = 0x9,

    FRAME_TYPE_ALTSVC        = 0xA,

    FRAME_TYPE_UNUSED        = 0xB,

    FRAME_TYPE_ORIGIN        = 0xC,

    FRAME_TYPE_LAST          = 0xD

  };

  // NO_ERROR is a macro defined on windows, so we'll name the HTTP2 goaway

  // code NO_ERROR to be NO_HTTP_ERROR

  enum errorType {

    NO_HTTP_ERROR = 0,

    PROTOCOL_ERROR = 1,

    INTERNAL_ERROR = 2,

    FLOW_CONTROL_ERROR = 3,

    SETTINGS_TIMEOUT_ERROR = 4,

    STREAM_CLOSED_ERROR = 5,

    FRAME_SIZE_ERROR = 6,

    REFUSED_STREAM_ERROR = 7,

    CANCEL_ERROR = 8,

    COMPRESSION_ERROR = 9,

    CONNECT_ERROR = 10,

    ENHANCE_YOUR_CALM = 11,

    INADEQUATE_SECURITY = 12,

    HTTP_1_1_REQUIRED = 13,

    UNASSIGNED = 31

  };

  // These are frame flags. If they, or other undefined flags, are

  // used on frames other than the comments indicate they MUST be ignored.

  const static uint8_t kFlag_END_STREAM = 0x01; // data, headers

  const static uint8_t kFlag_END_HEADERS = 0x04; // headers, continuation

  const static uint8_t kFlag_END_PUSH_PROMISE = 0x04; // push promise

  const static uint8_t kFlag_ACK = 0x01; // ping and settings

  const static uint8_t kFlag_PADDED = 0x08; // data, headers, push promise, continuation

  const static uint8_t kFlag_PRIORITY = 0x20; // headers

  enum {

    SETTINGS_TYPE_HEADER_TABLE_SIZE = 1, // compression table size

    SETTINGS_TYPE_ENABLE_PUSH = 2,     // can be used to disable push

    SETTINGS_TYPE_MAX_CONCURRENT = 3,  // streams recvr allowed to initiate

    SETTINGS_TYPE_INITIAL_WINDOW = 4,  // bytes for flow control default

    SETTINGS_TYPE_MAX_FRAME_SIZE = 5   // max frame size settings sender allows receipt of

  };

  // This should be big enough to hold all of your control packets,

  // but if it needs to grow for huge headers it can do so dynamically.

  const static uint32_t kDefaultBufferSize = 2048;

  // kDefaultQueueSize must be >= other queue size constants

  const static uint32_t kDefaultQueueSize =  32768;

  const static uint32_t kQueueMinimumCleanup = 24576;

  const static uint32_t kQueueTailRoom    =  4096;

  const static uint32_t kQueueReserved    =  1024;

  const static uint32_t kMaxStreamID = 0x7800000;

  // This is a sentinel for a deleted stream. It is not a valid

  // 31 bit stream ID.

  const static uint32_t kDeadStreamID = 0xffffdead;

  // below the emergency threshold of local window we ack every received

  // byte. Above that we coalesce bytes into the MinimumToAck size.

  const static int32_t  kEmergencyWindowThreshold = 96 * 1024;

  const static uint32_t kMinimumToAck = 4 * 1024 * 1024;

  // The default rwin is 64KB - 1 unless updated by a settings frame

  const static uint32_t kDefaultRwin = 65535;

  // We limit frames to 2^14 bytes of length in order to preserve responsiveness

  // This is the smallest allowed value for SETTINGS_MAX_FRAME_SIZE

  const static uint32_t kMaxFrameData = 0x4000;

  const static uint8_t kFrameLengthBytes = 3;

  const static uint8_t kFrameStreamIDBytes = 4;

  const static uint8_t kFrameFlagBytes = 1;

  const static uint8_t kFrameTypeBytes = 1;

  const static uint8_t kFrameHeaderBytes = kFrameLengthBytes + kFrameFlagBytes +

    kFrameTypeBytes + kFrameStreamIDBytes;

  enum {

    kLeaderGroupID =      0x3,

    kOtherGroupID =       0x5,

    kBackgroundGroupID =  0x7,

    kSpeculativeGroupID = 0x9,

    kFollowerGroupID =    0xB,

    kUrgentStartGroupID = 0xD

    // Hey, you! YES YOU! If you add/remove any groups here, you almost

    // certainly need to change the lookup of the stream/ID hash in

    // Http2Session::OnTransportStatus and |kPriorityGroupCount| below.

    // Yeah, that's right. YOU!

  };

  const static uint8_t kPriorityGroupCount = 6;

  static nsresult RecvHeaders(Http2Session *);

  static nsresult RecvPriority(Http2Session *);

  static nsresult RecvRstStream(Http2Session *);

  static nsresult RecvSettings(Http2Session *);

  static nsresult RecvPushPromise(Http2Session *);

  static nsresult RecvPing(Http2Session *);

  static nsresult RecvGoAway(Http2Session *);

  static nsresult RecvWindowUpdate(Http2Session *);

  static nsresult RecvContinuation(Http2Session *);

  static nsresult RecvAltSvc(Http2Session *);

  static nsresult RecvUnused(Http2Session *);

  static nsresult RecvOrigin(Http2Session *);

  char       *EnsureOutputBuffer(uint32_t needed);

  template<typename charType>

  void CreateFrameHeader(charType dest, uint16_t frameLength,

                         uint8_t frameType, uint8_t frameFlags,

                         uint32_t streamID);

  // For writing the data stream to LOG4

  static void LogIO(Http2Session *, Http2Stream *, const char *,

                    const char *, uint32_t);

  // overload of nsAHttpConnection

  void TransactionHasDataToWrite(nsAHttpTransaction *) override;

  void TransactionHasDataToRecv(nsAHttpTransaction *) override;

  // a similar version for Http2Stream

  void TransactionHasDataToWrite(Http2Stream *);

  // an overload of nsAHttpSegementReader

  virtual MOZ_MUST_USE nsresult CommitToSegmentSize(uint32_t size,

                                                    bool forceCommitment) override;

  MOZ_MUST_USE nsresult BufferOutput(const char *, uint32_t, uint32_t *);

  void     FlushOutputQueue();

  uint32_t AmountOfOutputBuffered() { return mOutputQueueUsed - mOutputQueueSent; }

  uint32_t GetServerInitialStreamWindow() { return mServerInitialStreamWindow; }

  MOZ_MUST_USE bool TryToActivate(Http2Stream *stream);

  void ConnectPushedStream(Http2Stream *stream);

  void ConnectSlowConsumer(Http2Stream *stream);

  MOZ_MUST_USE nsresult ConfirmTLSProfile();

  static MOZ_MUST_USE bool ALPNCallback(nsISupports *securityInfo);

  uint64_t Serial() { return mSerial; }

  void PrintDiagnostics (nsCString &log) override;

  // Streams need access to these

  uint32_t SendingChunkSize() { return mSendingChunkSize; }

  uint32_t PushAllowance() { return mPushAllowance; }

  Http2Compressor *Compressor() { return &mCompressor; }

  nsISocketTransport *SocketTransport() { return mSocketTransport; }

  int64_t ServerSessionWindow() { return mServerSessionWindow; }

  void DecrementServerSessionWindow (uint32_t bytes) { mServerSessionWindow -= bytes; }

  uint32_t InitialRwin() { return mInitialRwin; }

  void SendPing() override;

  MOZ_MUST_USE bool MaybeReTunnel(nsAHttpTransaction *) override;

  bool UseH2Deps() { return mUseH2Deps; }

  // overload of nsAHttpTransaction

  MOZ_MUST_USE nsresult ReadSegmentsAgain(nsAHttpSegmentReader *, uint32_t, uint32_t *, bool *) final;

  MOZ_MUST_USE nsresult WriteSegmentsAgain(nsAHttpSegmentWriter *, uint32_t , uint32_t *, bool *) final;

  MOZ_MUST_USE bool Do0RTT() final { return true; }

  MOZ_MUST_USE nsresult Finish0RTT(bool aRestart, bool aAlpnChanged) final;

  void SetFastOpenStatus(uint8_t aStatus) final;

  // For use by an HTTP2Stream

  void Received421(nsHttpConnectionInfo *ci);

  void SendPriorityFrame(uint32_t streamID, uint32_t dependsOn, uint8_t weight);

  void IncrementTrrCounter() { mTrrStreams++; }

private:

  // These internal states do not correspond to the states of the HTTP/2 specification

  enum internalStateType {

    BUFFERING_OPENING_SETTINGS,

    BUFFERING_FRAME_HEADER,

    BUFFERING_CONTROL_FRAME,

    PROCESSING_DATA_FRAME_PADDING_CONTROL,

    PROCESSING_DATA_FRAME,

    DISCARDING_DATA_FRAME_PADDING,

    DISCARDING_DATA_FRAME,

    PROCESSING_COMPLETE_HEADERS,

    PROCESSING_CONTROL_RST_STREAM,

    NOT_USING_NETWORK

  };

  static const uint8_t kMagicHello[24];

  MOZ_MUST_USE nsresult ResponseHeadersComplete();

  uint32_t    GetWriteQueueSize();

  void        ChangeDownstreamState(enum internalStateType);

  void        ResetDownstreamState();

  MOZ_MUST_USE nsresult ReadyToProcessDataFrame(enum internalStateType);

  MOZ_MUST_USE nsresult UncompressAndDiscard(bool);

  void        GeneratePing(bool);

  void        GenerateSettingsAck();

  void        GeneratePriority(uint32_t, uint8_t);

  void        GenerateRstStream(uint32_t, uint32_t);

  void        GenerateGoAway(uint32_t);

  void        CleanupStream(Http2Stream *, nsresult, errorType);

  void        CleanupStream(uint32_t, nsresult, errorType);

  void        CloseStream(Http2Stream *, nsresult);

  void        SendHello();

  void        RemoveStreamFromQueues(Http2Stream *);

  MOZ_MUST_USE nsresult ParsePadding(uint8_t &, uint16_t &);

  void        SetWriteCallbacks();

  void        RealignOutputQueue();

  void        ProcessPending();

  MOZ_MUST_USE nsresult ProcessConnectedPush(Http2Stream *,

                                             nsAHttpSegmentWriter *,

                                             uint32_t, uint32_t *);

  MOZ_MUST_USE nsresult ProcessSlowConsumer(Http2Stream *,

                                            nsAHttpSegmentWriter *,

                                            uint32_t, uint32_t *);

  MOZ_MUST_USE nsresult SetInputFrameDataStream(uint32_t);

  void        CreatePriorityNode(uint32_t, uint32_t, uint8_t, const char *);

  char        *CreatePriorityFrame(uint32_t, uint32_t, uint8_t);

  bool        VerifyStream(Http2Stream *, uint32_t);

  void        SetNeedsCleanup();

  void        UpdateLocalRwin(Http2Stream *stream, uint32_t bytes);

  void        UpdateLocalStreamWindow(Http2Stream *stream, uint32_t bytes);

  void        UpdateLocalSessionWindow(uint32_t bytes);

  void        MaybeDecrementConcurrent(Http2Stream *stream);

  bool        RoomForMoreConcurrent();

  void        IncrementConcurrent(Http2Stream *stream);

  void        QueueStream(Http2Stream *stream);

  // a wrapper for all calls to the nshttpconnection level segment writer. Used

  // to track network I/O for timeout purposes

  MOZ_MUST_USE nsresult NetworkRead(nsAHttpSegmentWriter *, char *, uint32_t, uint32_t *);

  void Shutdown();

  // This is intended to be nsHttpConnectionMgr:nsConnectionHandle taken

  // from the first transaction on this session. That object contains the

  // pointer to the real network-level nsHttpConnection object.

  RefPtr<nsAHttpConnection> mConnection;

  // The underlying socket transport object is needed to propogate some events

  nsISocketTransport         *mSocketTransport;

  // These are temporary state variables to hold the argument to

  // Read/WriteSegments so it can be accessed by On(read/write)segment

  // further up the stack.

  nsAHttpSegmentReader       *mSegmentReader;

  nsAHttpSegmentWriter       *mSegmentWriter;

  uint32_t          mSendingChunkSize;        /* the transmission chunk size */

  uint32_t          mNextStreamID;            /* 24 bits */

  uint32_t          mLastPushedID;

  uint32_t          mConcurrentHighWater;     /* max parallelism on session */

  uint32_t          mPushAllowance;           /* rwin for unmatched pushes */

  internalStateType mDownstreamState; /* in frame, between frames, etc..  */

  // Maintain 2 indexes - one by stream ID, one by transaction pointer.

  // There are also several lists of streams: ready to write, queued due to

  // max parallelism, streams that need to force a read for push, and the full

  // set of pushed streams.

  // The objects are not ref counted - they get destroyed

  // by the nsClassHashtable implementation when they are removed from

  // the transaction hash.

  nsDataHashtable<nsUint32HashKey, Http2Stream *>     mStreamIDHash;

  nsClassHashtable<nsPtrHashKey<nsAHttpTransaction>,

    Http2Stream>                                      mStreamTransactionHash;

  nsDeque                                             mReadyForWrite;

  nsDeque                                             mQueuedStreams;

  nsDeque                                             mPushesReadyForRead;

  nsDeque                                             mSlowConsumersReadyForRead;

  nsTArray<Http2PushedStream *>                       mPushedStreams;

  // Compression contexts for header transport.

  // HTTP/2 compresses only HTTP headers and does not reset the context in between

  // frames. Even data that is not associated with a stream (e.g invalid

  // stream ID) is passed through these contexts to keep the compression

  // context correct.

  Http2Compressor     mCompressor;

  Http2Decompressor   mDecompressor;

  nsCString           mDecompressBuffer;

  // mInputFrameBuffer is used to store received control packets and the 8 bytes

  // of header on data packets

  uint32_t             mInputFrameBufferSize; // buffer allocation

  uint32_t             mInputFrameBufferUsed; // amt of allocation used

  UniquePtr<char[]>    mInputFrameBuffer;

  // mInputFrameDataSize/Read are used for tracking the amount of data consumed

  // in a frame after the 8 byte header. Control frames are always fully buffered

  // and the fixed 8 byte leading header is at mInputFrameBuffer + 0, the first

  // data byte (i.e. the first settings/goaway/etc.. specific byte) is at

  // mInputFrameBuffer + 8

  // The frame size is mInputFrameDataSize + the constant 8 byte header

  uint32_t             mInputFrameDataSize;

  uint32_t             mInputFrameDataRead;

  bool                 mInputFrameFinal; // This frame was marked FIN

  uint8_t              mInputFrameType;

  uint8_t              mInputFrameFlags;

  uint32_t             mInputFrameID;

  uint16_t             mPaddingLength;

  // When a frame has been received that is addressed to a particular stream

  // (e.g. a data frame after the stream-id has been decoded), this points

  // to the stream.

  Http2Stream          *mInputFrameDataStream;

  // mNeedsCleanup is a state variable to defer cleanup of a closed stream

  // If needed, It is set in session::OnWriteSegments() and acted on and

  // cleared when the stack returns to session::WriteSegments(). The stream

  // cannot be destroyed directly out of OnWriteSegments because

  // stream::writeSegments() is on the stack at that time.

  Http2Stream          *mNeedsCleanup;

  // This reason code in the last processed RESET frame

  uint32_t             mDownstreamRstReason;

  // When HEADERS/PROMISE are chained together, this is the expected ID of the next

  // recvd frame which must be the same type

  uint32_t             mExpectedHeaderID;

  uint32_t             mExpectedPushPromiseID;

  uint32_t             mContinuedPromiseStream;

  // for the conversion of downstream http headers into http/2 formatted headers

  // The data here does not persist between frames

  nsCString            mFlatHTTPResponseHeaders;

  uint32_t             mFlatHTTPResponseHeadersOut;

  // when set, the session will go away when it reaches 0 streams. This flag

  // is set when: the stream IDs are running out (at either the client or the

  // server), when DontReuse() is called, a RST that is not specific to a

  // particular stream is received, a GOAWAY frame has been received from

  // the server.

  bool                 mShouldGoAway;

  // the session has received a nsAHttpTransaction::Close()  call

  bool                 mClosed;

  // the session received a GoAway frame with a valid GoAwayID

  bool                 mCleanShutdown;

  // the session received the opening SETTINGS frame from the server

  bool                 mReceivedSettings;

  // The TLS comlpiance checks are not done in the ctor beacuse of bad

  // exception handling - so we do them at IO time and cache the result

  bool                 mTLSProfileConfirmed;

  // A specifc reason code for the eventual GoAway frame. If set to NO_HTTP_ERROR

  // only NO_HTTP_ERROR, PROTOCOL_ERROR, or INTERNAL_ERROR will be sent.

  errorType            mGoAwayReason;

  // The error code sent/received on the session goaway frame. UNASSIGNED/31

  // if not transmitted.

  int32_t             mClientGoAwayReason;

  int32_t             mPeerGoAwayReason;

  // If a GoAway message was received this is the ID of the last valid

  // stream. 0 otherwise. (0 is never a valid stream id.)

  uint32_t             mGoAwayID;

  // The last stream processed ID we will send in our GoAway frame.

  uint32_t             mOutgoingGoAwayID;

  // The limit on number of concurrent streams for this session. Normally it

  // is basically unlimited, but the SETTINGS control message from the

  // server might bring it down.

  uint32_t             mMaxConcurrent;

  // The actual number of concurrent streams at this moment. Generally below

  // mMaxConcurrent, but the max can be lowered in real time to a value

  // below the current value

  uint32_t             mConcurrent;

  // The number of server initiated promises, tracked for telemetry

  uint32_t             mServerPushedResources;

  // The server rwin for new streams as determined from a SETTINGS frame

  uint32_t             mServerInitialStreamWindow;

  // The Local Session window is how much data the server is allowed to send

  // (across all streams) without getting a window update to stream 0. It is

  // signed because asynchronous changes via SETTINGS can drive it negative.

  int64_t              mLocalSessionWindow;

  // The Remote Session Window is how much data the client is allowed to send

  // (across all streams) without receiving a window update to stream 0. It is

  // signed because asynchronous changes via SETTINGS can drive it negative.

  int64_t              mServerSessionWindow;

  // The initial value of the local stream and session window

  uint32_t             mInitialRwin;

  // This is a output queue of bytes ready to be written to the SSL stream.

  // When that streams returns WOULD_BLOCK on direct write the bytes get

  // coalesced together here. This results in larger writes to the SSL layer.

  // The buffer is not dynamically grown to accomodate stream writes, but

  // does expand to accept infallible session wide frames like GoAway and RST.

  uint32_t             mOutputQueueSize;

  uint32_t             mOutputQueueUsed;

  uint32_t             mOutputQueueSent;

  UniquePtr<char[]>    mOutputQueueBuffer;

  PRIntervalTime       mPingThreshold;

  PRIntervalTime       mLastReadEpoch;     // used for ping timeouts

  PRIntervalTime       mLastDataReadEpoch; // used for IdleTime()

  PRIntervalTime       mPingSentEpoch;

  PRIntervalTime       mPreviousPingThreshold; // backup for the former value

  bool                 mPreviousUsed;          // true when backup is used

  // used as a temporary buffer while enumerating the stream hash during GoAway

  nsDeque  mGoAwayStreamsToRestart;

  // Each session gets a unique serial number because the push cache is correlated

  // by the load group and the serial number can be used as part of the cache key

  // to make sure streams aren't shared across sessions.

  uint64_t        mSerial;

  // Telemetry for continued headers (pushed and pulled) for quic design

  uint32_t        mAggregatedHeaderSize;

  // If push is disabled, we want to be able to send PROTOCOL_ERRORs if we

  // receive a PUSH_PROMISE, but we have to wait for the SETTINGS ACK before

  // we can actually tell the other end to go away. These help us keep track

  // of that state so we can behave appropriately.

  bool mWaitingForSettingsAck;

  bool mGoAwayOnPush;

  bool mUseH2Deps;

  bool mAttemptingEarlyData;

  // The ID(s) of the stream(s) that we are getting 0RTT data from.

  nsTArray<WeakPtr<Http2Stream>> m0RTTStreams;

  // The ID(s) of the stream(s) that are not able to send 0RTT data. We need to

  // remember them put them into mReadyForWrite queue when 0RTT finishes.

  nsTArray<WeakPtr<Http2Stream>> mCannotDo0RTTStreams;

  bool RealJoinConnection(const nsACString &hostname, int32_t port, bool jk);

  bool TestOriginFrame(const nsACString &name, int32_t port);

  bool mOriginFrameActivated;

  nsDataHashtable<nsCStringHashKey, bool> mOriginFrame;

  nsDataHashtable<nsCStringHashKey, bool> mJoinConnectionCache;

  uint64_t mCurrentForegroundTabOuterContentWindowId;

  class CachePushCheckCallback final : public nsICacheEntryOpenCallback

  {

  public:

    CachePushCheckCallback(Http2Session *session, uint32_t promisedID, const nsACString &requestString);

    NS_DECL_ISUPPORTS

    NS_DECL_NSICACHEENTRYOPENCALLBACK

  private:

    ~CachePushCheckCallback() = default;

    RefPtr<Http2Session> mSession;

    uint32_t mPromisedID;

    nsHttpRequestHead mRequestHead;

  };

  // A h2 session will be created before all socket events are trigered,

  // e.g. NS_NET_STATUS_TLS_HANDSHAKE_ENDED and for TFO many others.

  // We should propagate this events to the first nsHttpTransaction.

  RefPtr<nsHttpTransaction> mFirstHttpTransaction;

  bool mTlsHandshakeFinished;

  bool mCheckNetworkStallsWithTFO;

  PRIntervalTime mLastRequestBytesSentTime;

private:

/// connect tunnels

  void DispatchOnTunnel(nsAHttpTransaction *, nsIInterfaceRequestor *);

  void CreateTunnel(nsHttpTransaction *, nsHttpConnectionInfo *, nsIInterfaceRequestor *);

  void RegisterTunnel(Http2Stream *);

  void UnRegisterTunnel(Http2Stream *);

  uint32_t FindTunnelCount(nsHttpConnectionInfo *);

  nsDataHashtable<nsCStringHashKey, uint32_t> mTunnelHash;

  uint32_t mTrrStreams;

};

} // namespace net

} // namespace mozilla

#endif // mozilla_net_Http2Session_h