Landing Recent QUIC changes until 01/26/2016 18:14 UTC

net/quic/quic_session.h

 // 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.
 
 #ifndef NET_QUIC_QUIC_SESSION_H_
 #define NET_QUIC_QUIC_SESSION_H_
 
 #include <stddef.h>
@@ skipping 13 matching lines @@
 #include "net/quic/quic_packet_creator.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_write_blocked_list.h"
 #include "net/quic/reliable_quic_stream.h"
 
 namespace net {
 
 class QuicCryptoStream;
 class QuicFlowController;
 class ReliableQuicStream;
-class VisitorShim;
 
 namespace test {
 class QuicSessionPeer;
 }  // namespace test
 
 class NET_EXPORT_PRIVATE QuicSession : public QuicConnectionVisitorInterface {
  public:
   // CryptoHandshakeEvent enumerates the events generated by a QuicCryptoStream.
   enum CryptoHandshakeEvent {
     // ENCRYPTION_FIRST_ESTABLISHED indicates that a full client hello has been
@@ skipping 23 matching lines @@
   void OnRstStream(const QuicRstStreamFrame& frame) override;
   void OnGoAway(const QuicGoAwayFrame& frame) override;
   void OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame) override;
   void OnBlockedFrame(const QuicBlockedFrame& frame) override;
   void OnConnectionClosed(QuicErrorCode error, bool from_peer) override;
   void OnWriteBlocked() override {}
   void OnSuccessfulVersionNegotiation(const QuicVersion& version) override;
   void OnCanWrite() override;
   void OnCongestionWindowChange(QuicTime /*now*/) override {}
   void OnConnectionMigration() override {}
+  // Deletes streams that are safe to be deleted now that it's safe to do so (no
+  // other operations are being done on the streams at this time).
+  void PostProcessAfterData() override;
   bool WillingAndAbleToWrite() const override;
   bool HasPendingHandshake() const override;
   bool HasOpenDynamicStreams() const override;
 
   // Called on every incoming packet. Passes |packet| through to |connection_|.
   virtual void ProcessUdpPacket(const IPEndPoint& self_address,
                                 const IPEndPoint& peer_address,
                                 const QuicEncryptedPacket& packet);
 
   // Called by streams when they want to write data to the peer.
@@ skipping 106 matching lines @@
   Perspective perspective() const { return connection_->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 get_max_open_streams() const { return max_open_streams_; }
+  size_t max_open_incoming_streams() const {
+    return max_open_incoming_streams_;
+  }
 
-  size_t get_max_available_streams() const {
-    return max_open_streams_ * kMaxAvailableStreamsMultiplier;
+  size_t max_open_outgoing_streams() const {
+    return max_open_outgoing_streams_;
   }
 
+  size_t MaxAvailableStreams() const;
+
   ReliableQuicStream* GetStream(const QuicStreamId stream_id);
 
   // Mark a stream as draining.
   virtual void StreamDraining(QuicStreamId id);
 
   // Close the connection, if it is not already closed.
   void CloseConnectionWithDetails(QuicErrorCode error, const char* details);
 
   // Returns true if this stream should yield writes to another blocked stream.
   bool ShouldYield(QuicStreamId stream_id);
@@ skipping 21 matching lines @@
   // Returns the stream ID for a new outgoing stream, and increments the
   // underlying counter.
   QuicStreamId GetNextOutgoingStreamId();
 
   // Returns existing stream with id = |stream_id|. If no such stream exists,
   // and |stream_id| is a peer-created id, then a new stream is created and
   // returned. However if |stream_id| is a locally-created id and no such stream
   // exists, the connection is closed.
   ReliableQuicStream* GetOrCreateDynamicStream(QuicStreamId stream_id);
 
-  // This is called after every call other than OnConnectionClose from the
-  // QuicConnectionVisitor to allow post-processing once the work has been done.
-  // In this case, it deletes streams given that it's safe to do so (no other
-  // operations are being done on the streams at this time)
-  virtual void PostProcessAfterData();
-
   // Performs the work required to close |stream_id|.  If |locally_reset|
   // then the stream has been reset by this endpoint, not by the peer.
   virtual void CloseStreamInner(QuicStreamId stream_id, bool locally_reset);
 
   // 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, or RST) this method
   // is called, and correctly updates the connection level flow controller.
   void UpdateFlowControlOnFinalReceivedByteOffset(
       QuicStreamId id,
       QuicStreamOffset final_byte_offset);
 
   // Return true if given stream is peer initiated.
   bool IsIncomingStream(QuicStreamId id) const;
 
   StreamMap& static_streams() { return static_stream_map_; }
   const StreamMap& static_streams() const { return static_stream_map_; }
 
   StreamMap& dynamic_streams() { return dynamic_stream_map_; }
   const StreamMap& dynamic_streams() const { return dynamic_stream_map_; }
 
   std::vector<ReliableQuicStream*>* closed_streams() {
     return &closed_streams_;
   }
 
-  void set_max_open_streams(size_t max_open_streams);
+  void set_max_open_incoming_streams(size_t max_open_incoming_streams);
+  void set_max_open_outgoing_streams(size_t max_open_outgoing_streams);
 
   void set_largest_peer_created_stream_id(
       QuicStreamId largest_peer_created_stream_id) {
     largest_peer_created_stream_id_ = largest_peer_created_stream_id;
   }
   void set_error(QuicErrorCode error) { error_ = error; }
   QuicWriteBlockedList* write_blocked_streams() {
     return &write_blocked_streams_;
   }
 
@@ skipping 26 matching lines @@
   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);
 
  private:
   friend class test::QuicSessionPeer;
-  friend class VisitorShim;
 
   // 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 connection level flow
   // control window in a negotiated config. Closes the connection if invalid.
   void OnNewSessionFlowControlWindow(QuicStreamOffset new_window);
 
   // Called in OnConfigNegotiated when auto-tuning is enabled for flow
   // control receive windows.
   void EnableAutoTuneReceiveWindow();
 
   // Called in OnConfigNegotiated for finch trials to measure performance of
   // starting with smaller flow control receive windows and auto-tuning.
   void AdjustInitialFlowControlWindows(size_t stream_window);
 
   // Keep track of highest received byte offset of locally closed streams, while
   // waiting for a definitive final highest offset from the peer.
   std::map<QuicStreamId, QuicStreamOffset>
       locally_closed_streams_highest_offset_;
 
   scoped_ptr<QuicConnection> connection_;
 
-  // A shim to stand between the connection and the session, to handle stream
-  // deletions.
-  scoped_ptr<VisitorShim> visitor_shim_;
-
   std::vector<ReliableQuicStream*> closed_streams_;
 
   QuicConfig config_;
 
-  // Returns the maximum number of streams this connection can open.
-  size_t max_open_streams_;
+  // The maximum number of outgoing streams this connection can open.
+  size_t max_open_outgoing_streams_;
+
+  // The maximum number of incoming streams this connection will allow.
+  size_t max_open_incoming_streams_;
 
   // Static streams, such as crypto and header streams. Owned by child classes
   // that create these streams.
   StreamMap static_stream_map_;
 
   // Map from StreamId to pointers to streams. Owns the streams.
   StreamMap dynamic_stream_map_;
 
   // The ID to use for the next outgoing stream.
   QuicStreamId next_outgoing_stream_id_;
@@ skipping 31 matching lines @@
   // The stream id which was last popped in OnCanWrite, or 0, if not under the
   // call stack of OnCanWrite.
   QuicStreamId currently_writing_stream_id_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSession);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SESSION_H_