1 files changed, 377 insertions, 0 deletions
diff --git a/netwerk/protocol/http/Http2StreamBase.h b/netwerk/protocol/http/Http2StreamBase.h
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+++ b/netwerk/protocol/http/Http2StreamBase.h
@@ -0,0 +1,377 @@
+/* -*- 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_Http2StreamBase_h
+#define mozilla_net_Http2StreamBase_h
+
+// HTTP/2 - RFC7540
+// https://www.rfc-editor.org/rfc/rfc7540.txt
+
+#include "mozilla/Attributes.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/WeakPtr.h"
+#include "nsAHttpTransaction.h"
+#include "nsISupportsPriority.h"
+#include "SimpleBuffer.h"
+#include "nsISupportsImpl.h"
+#include "nsIURI.h"
+
+class nsISocketTransport;
+class nsIInputStream;
+class nsIOutputStream;
+
+namespace mozilla {
+class OriginAttributes;
+}
+
+namespace mozilla::net {
+
+class nsStandardURL;
+class Http2Session;
+class Http2Stream;
+class Http2PushedStream;
+class Http2Decompressor;
+
+class Http2StreamBase : public nsAHttpSegmentReader,
+                        public nsAHttpSegmentWriter,
+                        public SupportsWeakPtr {
+ public:
+  NS_DECL_NSAHTTPSEGMENTREADER
+
+  enum stateType {
+    IDLE,
+    RESERVED_BY_REMOTE,
+    OPEN,
+    CLOSED_BY_LOCAL,
+    CLOSED_BY_REMOTE,
+    CLOSED
+  };
+
+  const static int32_t kNormalPriority = 0x1000;
+  const static int32_t kWorstPriority =
+      kNormalPriority + nsISupportsPriority::PRIORITY_LOWEST;
+  const static int32_t kBestPriority =
+      kNormalPriority + nsISupportsPriority::PRIORITY_HIGHEST;
+
+  Http2StreamBase(uint64_t, Http2Session*, int32_t, uint64_t);
+
+  uint32_t StreamID() { return mStreamID; }
+
+  stateType HTTPState() { return mState; }
+  void SetHTTPState(stateType val) { mState = val; }
+
+  [[nodiscard]] virtual nsresult ReadSegments(nsAHttpSegmentReader*, uint32_t,
+                                              uint32_t*);
+  [[nodiscard]] virtual nsresult WriteSegments(nsAHttpSegmentWriter*, uint32_t,
+                                               uint32_t*);
+  virtual bool DeferCleanup(nsresult status);
+
+  const nsCString& Origin() const { return mOrigin; }
+  const nsCString& Host() const { return mHeaderHost; }
+  const nsCString& Path() const { return mHeaderPath; }
+
+  bool RequestBlockedOnRead() {
+    return static_cast<bool>(mRequestBlockedOnRead);
+  }
+
+  bool HasRegisteredID() { return mStreamID != 0; }
+
+  virtual nsAHttpTransaction* Transaction() { return nullptr; }
+  nsHttpTransaction* HttpTransaction();
+  virtual nsIRequestContext* RequestContext() { return nullptr; }
+
+  virtual void CloseStream(nsresult reason) = 0;
+  void SetResponseIsComplete();
+
+  void SetRecvdFin(bool aStatus);
+  bool RecvdFin() { return mRecvdFin; }
+
+  void SetRecvdData(bool aStatus) { mReceivedData = aStatus ? 1 : 0; }
+  bool RecvdData() { return mReceivedData; }
+
+  void SetSentFin(bool aStatus);
+  bool SentFin() { return mSentFin; }
+
+  void SetRecvdReset(bool aStatus);
+  bool RecvdReset() { return mRecvdReset; }
+
+  void SetSentReset(bool aStatus);
+  bool SentReset() { return mSentReset; }
+
+  void SetQueued(bool aStatus) { mQueued = aStatus ? 1 : 0; }
+  bool Queued() { return mQueued; }
+
+  void SetCountAsActive(bool aStatus) { mCountAsActive = aStatus ? 1 : 0; }
+  bool CountAsActive() { return mCountAsActive; }
+
+  void SetAllHeadersReceived();
+  void UnsetAllHeadersReceived() { mAllHeadersReceived = 0; }
+  bool AllHeadersReceived() { return mAllHeadersReceived; }
+
+  void UpdateTransportSendEvents(uint32_t count);
+  void UpdateTransportReadEvents(uint32_t count);
+
+  // NS_ERROR_ABORT terminates stream, other failure terminates session
+  [[nodiscard]] nsresult ConvertResponseHeaders(Http2Decompressor*, nsACString&,
+                                                nsACString&, int32_t&);
+  [[nodiscard]] nsresult ConvertResponseTrailers(Http2Decompressor*,
+                                                 nsACString&);
+
+  bool AllowFlowControlledWrite();
+  void UpdateServerReceiveWindow(int32_t delta);
+  int64_t ServerReceiveWindow() { return mServerReceiveWindow; }
+
+  void DecrementClientReceiveWindow(uint32_t delta) {
+    mClientReceiveWindow -= delta;
+    mLocalUnacked += delta;
+  }
+
+  void IncrementClientReceiveWindow(uint32_t delta) {
+    mClientReceiveWindow += delta;
+    mLocalUnacked -= delta;
+  }
+
+  uint64_t LocalUnAcked();
+  int64_t ClientReceiveWindow() { return mClientReceiveWindow; }
+
+  bool BlockedOnRwin() { return mBlockedOnRwin; }
+
+  uint32_t Priority() { return mPriority; }
+  uint32_t PriorityDependency() { return mPriorityDependency; }
+  uint8_t PriorityWeight() { return mPriorityWeight; }
+  void SetPriority(uint32_t);
+  void SetPriorityDependency(uint32_t, uint32_t);
+  void UpdatePriorityDependency();
+
+  uint64_t TransactionTabId() { return mTransactionTabId; }
+
+  // A pull stream has an implicit sink, a pushed stream has a sink
+  // once it is matched to a pull stream.
+  virtual bool HasSink() { return true; }
+
+  already_AddRefed<Http2Session> Session();
+
+  // Mirrors nsAHttpTransaction
+  bool Do0RTT();
+  nsresult Finish0RTT(bool aRestart, bool aAlpnChanged);
+
+  nsresult GetOriginAttributes(mozilla::OriginAttributes* oa);
+
+  virtual void TopBrowsingContextIdChanged(uint64_t id);
+  void TopBrowsingContextIdChangedInternal(
+      uint64_t id);  // For use by pushed streams only
+
+  virtual bool IsTunnel() { return false; }
+
+  virtual uint32_t GetWireStreamId() { return mStreamID; }
+  virtual Http2Stream* GetHttp2Stream() { return nullptr; }
+  virtual Http2PushedStream* GetHttp2PushedStream() { return nullptr; }
+
+  [[nodiscard]] virtual nsresult OnWriteSegment(char*, uint32_t,
+                                                uint32_t*) override;
+
+  virtual nsHttpConnectionInfo* ConnectionInfo();
+
+  bool DataBuffered() { return mSimpleBuffer.Available(); }
+
+  virtual nsresult Condition() { return NS_OK; }
+
+  virtual void DisableSpdy() {
+    if (Transaction()) {
+      Transaction()->DisableSpdy();
+    }
+  }
+  virtual void ReuseConnectionOnRestartOK(bool aReuse) {
+    if (Transaction()) {
+      Transaction()->ReuseConnectionOnRestartOK(aReuse);
+    }
+  }
+  virtual void MakeNonSticky() {
+    if (Transaction()) {
+      Transaction()->MakeNonSticky();
+    }
+  }
+
+ protected:
+  virtual ~Http2StreamBase();
+
+  virtual void HandleResponseHeaders(nsACString& aHeadersOut,
+                                     int32_t httpResponseCode) {}
+  virtual nsresult CallToWriteData(uint32_t count, uint32_t* countRead) = 0;
+  virtual nsresult CallToReadData(uint32_t count, uint32_t* countWritten) = 0;
+  virtual bool CloseSendStreamWhenDone() { return true; }
+
+  // These internal states track request generation
+  enum upstreamStateType {
+    GENERATING_HEADERS,
+    GENERATING_BODY,
+    SENDING_BODY,
+    SENDING_FIN_STREAM,
+    UPSTREAM_COMPLETE
+  };
+
+  uint32_t mStreamID{0};
+
+  // The session that this stream is a subset of
+  nsWeakPtr mSession;
+
+  // 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.
+  RefPtr<nsAHttpSegmentReader> mSegmentReader;
+  nsAHttpSegmentWriter* mSegmentWriter{nullptr};
+
+  nsCString mOrigin;
+  nsCString mHeaderHost;
+  nsCString mHeaderScheme;
+  nsCString mHeaderPath;
+
+  // Each stream goes from generating_headers to upstream_complete, perhaps
+  // looping on multiple instances of generating_body and
+  // sending_body for each frame in the upload.
+  enum upstreamStateType mUpstreamState { GENERATING_HEADERS };
+
+  // The HTTP/2 state for the stream from section 5.1
+  enum stateType mState { IDLE };
+
+  // Flag is set when all http request headers have been read ID is not stable
+  uint32_t mRequestHeadersDone : 1;
+
+  // Flag is set when ID is stable and concurrency limits are met
+  uint32_t mOpenGenerated : 1;
+
+  // Flag is set when all http response headers have been read
+  uint32_t mAllHeadersReceived : 1;
+
+  // Flag is set when stream is queued inside the session due to
+  // concurrency limits being exceeded
+  uint32_t mQueued : 1;
+
+  void ChangeState(enum upstreamStateType);
+
+  virtual void AdjustInitialWindow();
+  [[nodiscard]] nsresult TransmitFrame(const char*, uint32_t*,
+                                       bool forceCommitment);
+
+  // The underlying socket transport object is needed to propogate some events
+  nsCOMPtr<nsISocketTransport> mSocketTransport;
+
+  uint8_t mPriorityWeight = 0;       // h2 weight
+  uint32_t mPriorityDependency = 0;  // h2 stream id this one depends on
+  uint64_t mCurrentTopBrowsingContextId;
+  uint64_t mTransactionTabId{0};
+
+  // The InlineFrame and associated data is used for composing control
+  // frames and data frame headers.
+  UniquePtr<uint8_t[]> mTxInlineFrame;
+  uint32_t mTxInlineFrameSize{0};
+  uint32_t mTxInlineFrameUsed{0};
+
+  uint32_t mPriority = 0;  // geckoish weight
+
+  // Buffer for request header compression.
+  nsCString mFlatHttpRequestHeaders;
+
+  // Track the content-length of a request body so that we can
+  // place the fin flag on the last data packet instead of waiting
+  // for a stream closed indication. Relying on stream close results
+  // in an extra 0-length runt packet and seems to have some interop
+  // problems with the google servers. Connect does rely on stream
+  // close by setting this to the max value.
+  int64_t mRequestBodyLenRemaining{0};
+
+ private:
+  friend class mozilla::DefaultDelete<Http2StreamBase>;
+
+  [[nodiscard]] nsresult ParseHttpRequestHeaders(const char*, uint32_t,
+                                                 uint32_t*);
+  [[nodiscard]] nsresult GenerateOpen();
+
+  virtual nsresult GenerateHeaders(nsCString& aCompressedData,
+                                   uint8_t& firstFrameFlags) = 0;
+
+  void GenerateDataFrameHeader(uint32_t, bool);
+
+  [[nodiscard]] nsresult BufferInput(uint32_t, uint32_t*);
+
+  // The quanta upstream data frames are chopped into
+  uint32_t mChunkSize;
+
+  // Flag is set when the HTTP processor has more data to send
+  // but has blocked in doing so.
+  uint32_t mRequestBlockedOnRead : 1;
+
+  // Flag is set after the response frame bearing the fin bit has
+  // been processed. (i.e. after the server has closed).
+  uint32_t mRecvdFin : 1;
+
+  // Flag is set after 1st DATA frame has been passed to stream
+  uint32_t mReceivedData : 1;
+
+  // Flag is set after RST_STREAM has been received for this stream
+  uint32_t mRecvdReset : 1;
+
+  // Flag is set after RST_STREAM has been generated for this stream
+  uint32_t mSentReset : 1;
+
+  // Flag is set when stream is counted towards MAX_CONCURRENT streams in
+  // session
+  uint32_t mCountAsActive : 1;
+
+  // Flag is set when a FIN has been placed on a data or header frame
+  // (i.e after the client has closed)
+  uint32_t mSentFin : 1;
+
+  // Flag is set after the WAITING_FOR Transport event has been generated
+  uint32_t mSentWaitingFor : 1;
+
+  // Flag is set after TCP send autotuning has been disabled
+  uint32_t mSetTCPSocketBuffer : 1;
+
+  // Flag is set when OnWriteSegment is being called directly from stream
+  // instead of transaction
+  uint32_t mBypassInputBuffer : 1;
+
+  // mTxStreamFrameSize tracks the progress of
+  // transmitting a request body data frame. The data frame itself
+  // is never copied into the spdy layer.
+  uint32_t mTxStreamFrameSize{0};
+
+  // mClientReceiveWindow, mServerReceiveWindow, and mLocalUnacked are for flow
+  // control. *window are signed because the race conditions in asynchronous
+  // SETTINGS messages can force them temporarily negative.
+
+  // mClientReceiveWindow is how much data the server will send without getting
+  // a
+  //   window update
+  int64_t mClientReceiveWindow;
+
+  // mServerReceiveWindow is how much data the client is allowed to send without
+  //   getting a window update
+  int64_t mServerReceiveWindow;
+
+  // LocalUnacked is the number of bytes received by the client but not
+  //   yet reflected in a window update. Sending that update will increment
+  //   ClientReceiveWindow
+  uint64_t mLocalUnacked{0};
+
+  // True when sending is suspended becuase the server receive window is
+  //   <= 0
+  bool mBlockedOnRwin{false};
+
+  // For Progress Events
+  uint64_t mTotalSent{0};
+  uint64_t mTotalRead{0};
+
+  // Used to store stream data when the transaction channel cannot keep up
+  // and flow control has not yet kicked in.
+  SimpleBuffer mSimpleBuffer;
+
+  bool mAttempting0RTT{false};
+};
+
+}  // namespace mozilla::net
+
+#endif  // mozilla_net_Http2StreamBase_h