Http3WebTransportSession.h

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/* -*- Mode: C++; tab-width: 8; 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_Http3WebTransportSession_h

#define mozilla_net_Http3WebTransportSession_h

#include "ARefBase.h"

#include "Http3StreamBase.h"

#include "nsIWebTransport.h"

#include "mozilla/WeakPtr.h"

#include "mozilla/net/NeqoHttp3Conn.h"

namespace mozilla::net {

class Http3Session;

// TODO Http3WebTransportSession is very similar to Http3Stream. It should

// be built on top of it with a couple of small changes. The docs will be added

// when this is implemented.

class Http3WebTransportSession final : public Http3StreamBase,

                                       public nsAHttpSegmentWriter,

                                       public nsAHttpSegmentReader {

 public:

  NS_DECL_NSAHTTPSEGMENTWRITER

  NS_DECL_NSAHTTPSEGMENTREADER

  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(Http3WebTransportSession, override)

  Http3WebTransportSession(nsAHttpTransaction*, Http3Session*);

  Http3WebTransportSession* GetHttp3WebTransportSession() override {

    return this;

  Http3WebTransportStream* GetHttp3WebTransportStream() override {

    return nullptr;

  Http3Stream* GetHttp3Stream() override { return nullptr; }

  [[nodiscard]] nsresult ReadSegments() override;

  [[nodiscard]] nsresult WriteSegments() override;

  bool Done() const override { return mRecvState == RECV_DONE; }

  void Close(nsresult aResult) override;

  void SetResponseHeaders(nsTArray<uint8_t>& aResponseHeaders, bool fin,

                          bool interim) override;

  void SetWebTransportSessionEventListener(

      WebTransportSessionEventListener* listener) {

    mListener = listener;

  nsresult TryActivating();

  void TransactionIsDone(nsresult aResult);

  void CloseSession(uint32_t aStatus, const nsACString& aReason);

  void OnSessionClosed(bool aCleanly, uint32_t aStatus,

                       const nsACString& aReason);

  void CreateOutgoingBidirectionalStream(

      std::function<void(Result<RefPtr<Http3WebTransportStream>, nsresult>&&)>&&

          aCallback);

  void CreateOutgoingUnidirectionalStream(

      std::function<void(Result<RefPtr<Http3WebTransportStream>, nsresult>&&)>&&

          aCallback);

  void RemoveWebTransportStream(Http3WebTransportStream* aStream);

  already_AddRefed<Http3WebTransportStream> OnIncomingWebTransportStream(

      WebTransportStreamType aType, uint64_t aId);

  void SendDatagram(nsTArray<uint8_t>&& aData, uint64_t aTrackingId);

  void OnDatagramReceived(nsTArray<uint8_t>&& aData);

  void GetMaxDatagramSize();

  void OnOutgoingDatagramOutCome(

      uint64_t aId, WebTransportSessionEventListener::DatagramOutcome aOutCome);

  void OnStreamStopSending(uint64_t aId, nsresult aError);

  void OnStreamReset(uint64_t aId, nsresult aError);

 private:

  virtual ~Http3WebTransportSession();

  bool ConsumeHeaders(const char* buf, uint32_t avail, uint32_t* countUsed);

  void CreateStreamInternal(

      bool aBidi,

      std::function<void(Result<RefPtr<Http3WebTransportStream>, nsresult>&&)>&&

          aCallback);

  enum RecvStreamState {

    BEFORE_HEADERS,

    READING_HEADERS,

    READING_INTERIM_HEADERS,

    ACTIVE,

    CLOSE_PENDING,

    RECV_DONE

  } mRecvState{BEFORE_HEADERS};

  enum SendStreamState {

    PREPARING_HEADERS,

    WAITING_TO_ACTIVATE,

    PROCESSING_DATAGRAM,

    SEND_DONE,

  } mSendState{PREPARING_HEADERS};

  nsCString mFlatHttpRequestHeaders;

  nsTArray<uint8_t> mFlatResponseHeaders;

  nsTArray<RefPtr<Http3WebTransportStream>> mStreams;

  nsresult mSocketInCondition = NS_ERROR_NOT_INITIALIZED;

  nsresult mSocketOutCondition = NS_ERROR_NOT_INITIALIZED;

  RefPtr<WebTransportSessionEventListener> mListener;

  uint32_t mStatus{0};

  nsCString mReason;

};

}  // namespace mozilla::net

#endif  // mozilla_net_Http3WebTransportSession_h