QUIC - disable QUIC if packet loss rate is bad for a connection.

net/quic/quic_client_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 client specific QuicSession subclass.  This class owns the underlying
 // QuicConnection and QuicConnectionHelper objects.  The connection stores
 // a non-owning pointer to the helper so this session needs to ensure that
 // the helper outlives the connection.
 
 #ifndef NET_QUIC_QUIC_CLIENT_SESSION_H_
@@ skipping 156 matching lines @@
 
   const BoundNetLog& net_log() const { return net_log_; }
 
   base::WeakPtr<QuicClientSession> GetWeakPtr();
 
   // Returns the number of client hello messages that have been sent on the
   // crypto stream. If the handshake has completed then this is one greater
   // than the number of round-trips needed for the handshake.
   int GetNumSentClientHellos() const;
 
+  // Return connection's overall packet loss rate in 1/10th of percent.
+  int PacketLossRate() const;

[Ryan Hamilton, 2015/03/21 00:04:46]

I wonder if a float would be more clear?

[ramant (doing other things), 2015/03/21 03:46:05]

Done.

+
   // Returns true if |hostname| may be pooled onto this session.  If this
   // is a secure QUIC session, then |hostname| must match the certificate
   // presented during the handshake.
   bool CanPool(const std::string& hostname, PrivacyMode privacy_mode) const;
 
   const QuicServerId& server_id() const { return server_id_; }
 
  protected:
   // QuicSession methods:
   QuicDataStream* CreateIncomingDataStream(QuicStreamId id) override;
@@ skipping 44 matching lines @@
   scoped_refptr<IOBufferWithSize> read_buffer_;
   TransportSecurityState* transport_security_state_;
   scoped_ptr<QuicServerInfo> server_info_;
   scoped_ptr<CertVerifyResult> cert_verify_result_;
   std::string pinning_failure_log_;
   ObserverSet observers_;
   StreamRequestQueue stream_requests_;
   bool read_pending_;
   CompletionCallback callback_;
   size_t num_total_streams_;
+  size_t number_of_handshakes_;
   base::TaskRunner* task_runner_;
   BoundNetLog net_log_;
   base::TimeTicks dns_resolution_end_time_;
   base::TimeTicks handshake_start_;  // Time the handshake was started.
   scoped_ptr<QuicConnectionLogger> logger_;
   // Number of packets read in the current read loop.
   size_t num_packets_read_;
   // True when the session is going away, and streams may no longer be created
   // on this session. Existing stream will continue to be processed.
   bool going_away_;
   base::WeakPtrFactory<QuicClientSession> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicClientSession);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CLIENT_SESSION_H_