Implement HTTP/2 settings field trial parameters.

net/spdy/spdy_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.
 
 #ifndef NET_SPDY_SPDY_SESSION_H_
 #define NET_SPDY_SPDY_SESSION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 57 matching lines @@
 const int kMaxSpdyFrameChunkSize = (2 * kMss) - 8;
 
 // Default value of SETTINGS_INITIAL_WINDOW_SIZE per protocol specification.
 // A session is always created with this initial window size.
 const int32_t kDefaultInitialWindowSize = 65535;
 
 // Maximum number of concurrent streams we will create, unless the server
 // sends a SETTINGS frame with a different value.
 const size_t kInitialMaxConcurrentStreams = 100;
 
-// Specifies the maximum HPACK dynamic table size the server is allowed to set.
-const int kMaxHeaderTableSize = 64 * 1024;
-
-// Specifies the maximum concurrent streams server could send (via push).
-const int kMaxConcurrentPushedStreams = 1000;
-
 // If more than this many bytes have been read or more than that many
 // milliseconds have passed, return ERR_IO_PENDING from ReadLoop.
 const int kYieldAfterBytesRead = 32 * 1024;
 const int kYieldAfterDurationMilliseconds = 20;
 
 // First and last valid stream IDs. As we always act as the client,
 // start at 1 for the first stream id.
 const SpdyStreamId kFirstStreamId = 1;
 const SpdyStreamId kLastStreamId = 0x7fffffff;
 
@@ skipping 206 matching lines @@
   // |spdy_session_key| is the host/port that this session connects to, privacy
   // and proxy configuration settings that it's using.
   // |session| is the HttpNetworkSession.  |net_log| is the NetLog that we log
   // network events to.
   SpdySession(const SpdySessionKey& spdy_session_key,
               HttpServerProperties* http_server_properties,
               TransportSecurityState* transport_security_state,
               bool enable_sending_initial_data,
               bool enable_ping_based_connection_checking,
               size_t session_max_recv_window_size,
-              size_t stream_max_recv_window_size,
+              const SettingsMap& settings,
               TimeFunc time_func,
               ServerPushDelegate* push_delegate,
               ProxyDelegate* proxy_delegate,
               NetLog* net_log);
 
   ~SpdySession() override;
 
   const HostPortPair& host_port_pair() const {
     return spdy_session_key_.host_port_proxy_pair().first;
   }
@@ skipping 766 matching lines @@
   AvailabilityState availability_state_;
   ReadState read_state_;
   WriteState write_state_;
 
   // If the session is closing (i.e., |availability_state_| is STATE_DRAINING),
   // then |error_on_close_| holds the error with which it was closed, which
   // may be OK (upon a polite GOAWAY) or an error < ERR_IO_PENDING otherwise.
   // Initialized to OK.
   Error error_on_close_;
 
+  // Settings that are sent in the initial SETTINGS frame
+  // (if |enable_sending_initial_data_| is true),
+  // and also control SpdySession parameters like initial receive window size
+  // and maximum HPACK dynamic table size.
+  const SettingsMap settings_;

[Ryan Hamilton, 2016/12/27 22:32:43]

nit: perhaps this should be initial_settings_?

[Bence, 2016/12/28 00:53:24]

Done.

+
   // Limits
   size_t max_concurrent_streams_;
   size_t max_concurrent_pushed_streams_;
 
   // Some statistics counters for the session.
   int streams_initiated_count_;
   int streams_pushed_count_;
   int streams_pushed_and_claimed_count_;
   int streams_abandoned_count_;
 
@@ skipping 37 matching lines @@
   // When bytes are consumed, SpdyIOBuffer destructor calls back to SpdySession,
   // and this member keeps count of them until the corresponding WINDOW_UPDATEs
   // are sent.  Zero unless session flow control is turned on.
   int32_t session_unacked_recv_window_bytes_;
 
   // Initial send window size for this session's streams. Can be
   // changed by an arriving SETTINGS frame. Newly created streams use
   // this value for the initial send window size.
   int32_t stream_initial_send_window_size_;
 
+  // The maximum HPACK dynamic table size the server is allowed to set.
+  uint32_t max_header_table_size_;
+
   // Initial receive window size for this session's streams. There are
   // plans to add a command line switch that would cause a SETTINGS
   // frame with window size announcement to be sent on startup. Newly
   // created streams will use this value for the initial receive
   // window size.
   int32_t stream_max_recv_window_size_;
 
   // A queue of stream IDs that have been send-stalled at some point
   // in the past.
   std::deque<SpdyStreamId> stream_send_unstall_queue_[NUM_PRIORITIES];
@@ skipping 38 matching lines @@
   // Used for posting asynchronous IO tasks.  We use this even though
   // SpdySession is refcounted because we don't need to keep the SpdySession
   // alive if the last reference is within a RunnableMethod.  Just revoke the
   // method.
   base::WeakPtrFactory<SpdySession> weak_factory_;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_SESSION_H_