Add support for setting QUIC connection options via field trial config.

chrome/browser/io_thread.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 CHROME_BROWSER_IO_THREAD_H_
 #define CHROME_BROWSER_IO_THREAD_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 51 matching lines @@
 class URLRequestContextGetter;
 class URLRequestJobFactory;
 class URLRequestThrottlerManager;
 class URLSecurityManager;
 }  // namespace net
 
 namespace policy {
 class PolicyService;
 }  // namespace policy
 
+namespace test {
+class IOThreadPeer;
+}  // namespace test
+
 // Contains state associated with, initialized and cleaned up on, and
 // primarily used on, the IO thread.
 //
 // If you are looking to interact with the IO thread (e.g. post tasks
 // to it or check if it is the current thread), see
 // content::BrowserThread.
 class IOThread : public content::BrowserThreadDelegate {
  public:
   struct Globals {
     template <typename T>
     class Optional {
      public:
       Optional() : set_(false) {}
 
       void set(T value) {
         set_ = true;
         value_ = value;
       }
-      void CopyToIfSet(T* value) {
+      void CopyToIfSet(T* value) const {
         if (set_) {
           *value = value_;
         }
       }
 
      private:
       bool set_;
       T value_;
     };
 
@@ skipping 64 matching lines @@
     Optional<string> trusted_spdy_proxy;
     Optional<bool> force_spdy_over_ssl;
     Optional<bool> force_spdy_always;
     std::set<net::HostPortPair> forced_spdy_exclusions;
     Optional<bool> use_alternate_protocols;
     Optional<bool> enable_websocket_over_spdy;
 
     Optional<bool> enable_quic;
     Optional<bool> enable_quic_pacing;
     Optional<bool> enable_quic_time_based_loss_detection;
-    Optional<bool> enable_quic_persist_server_info;
     Optional<bool> enable_quic_port_selection;
     Optional<size_t> quic_max_packet_length;
+    net::QuicTagVector quic_connection_options;
     Optional<std::string> quic_user_agent_id;
     Optional<net::QuicVersionVector> quic_supported_versions;
     Optional<net::HostPortPair> origin_to_force_quic_on;
     bool enable_user_alternate_protocol_ports;
     // NetErrorTabHelper uses |dns_probe_service| to send DNS probes when a
     // main frame load fails with a DNS error in order to provide more useful
     // information to the renderer so it can show a more specific error page.
     scoped_ptr<chrome_browser_net::DnsProbeService> dns_probe_service;
     scoped_ptr<data_reduction_proxy::DataReductionProxyParams>
         data_reduction_proxy_params;
@@ skipping 28 matching lines @@
   // Clears the host cache.  Intended to be used to prevent exposing recently
   // visited sites on about:net-internals/#dns and about:dns pages.  Must be
   // called on the IO thread.
   void ClearHostCache();
 
   void InitializeNetworkSessionParams(net::HttpNetworkSession::Params* params);
 
   base::TimeTicks creation_time() const;
 
  private:
+  typedef std::map<std::string, std::string> VariationParameters;

[Lei Zhang, 2014/06/23 21:28:14]

Can you briefly document what the key/value are?

[Ryan Hamilton, 2014/06/23 22:38:52]

Done.

+
   // Provide SystemURLRequestContextGetter with access to
   // InitSystemRequestContext().
   friend class SystemURLRequestContextGetter;
 
+  friend class test::IOThreadPeer;
+
   // BrowserThreadDelegate implementation, runs on the IO thread.
   // This handles initialization and destruction of state that must
   // live on the IO thread.
   virtual void Init() OVERRIDE;
   virtual void InitAsync() OVERRIDE;
   virtual void CleanUp() OVERRIDE;
 
+  // Initializes |params| based on the settings in |globals|.
+  static void InitializeNetworkSessionParamsFromGlobals(
+      const Globals& globals,
+      net::HttpNetworkSession::Params* params);
+
   void InitializeNetworkOptions(const base::CommandLine& parsed_command_line);
 
   // Enable SPDY with the given mode, which may contain the following:
   //
   //   "off"                      : Disables SPDY support entirely.
   //   "ssl"                      : Forces SPDY for all HTTPS requests.
   //   "no-ssl"                   : Forces SPDY for all HTTP requests.
   //   "no-ping"                  : Disables SPDY ping connection testing.
   //   "exclude=<host>"           : Disables SPDY support for the host <host>.
   //   "no-compress"              : Disables SPDY header compression.
@@ skipping 23 matching lines @@
   net::SSLConfigService* GetSSLConfigService();
 
   void ChangedToOnTheRecordOnIOThread();
 
   void UpdateDnsClientEnabled();
 
   // Configures QUIC options based on the flags in |command_line| as
   // well as the QUIC field trial group.
   void ConfigureQuic(const base::CommandLine& command_line);
 
+  // Configures QUIC options in |globals| based on the flags in |command_line|
+  // as well as the QUIC field trial group and parameters.
+  static void ConfigureQuicGlobals(
+      const base::CommandLine& command_line,
+      base::StringPiece quic_trial_group,
+      const VariationParameters& quic_trial_params,
+      Globals* globals);
+
   // Returns true if QUIC should be enabled, either as a result
   // of a field trial or a command line flag.
-  bool ShouldEnableQuic(const base::CommandLine& command_line,
-                        base::StringPiece quic_trial_group);
+  static bool ShouldEnableQuic(
+      const base::CommandLine& command_line,
+      base::StringPiece quic_trial_group);
 
   // Returns true if the selection of the ephemeral port in bind() should be
   // performed by Chromium, and false if the OS should select the port.  The OS
   // option is used to prevent Windows from posting a security security warning
   // dialog.
-  bool ShouldEnableQuicPortSelection(const base::CommandLine& command_line);
+  static bool ShouldEnableQuicPortSelection(
+      const base::CommandLine& command_line);
 
   // Returns true if QUIC packet pacing should be negotiated during the
   // QUIC handshake.
-  bool ShouldEnableQuicPacing(const base::CommandLine& command_line,
-                              base::StringPiece quic_trial_group);
+  static bool ShouldEnableQuicPacing(
+      const base::CommandLine& command_line,
+      base::StringPiece quic_trial_group,

[Lei Zhang, 2014/06/23 21:28:14]

base::StringPiece should be const ref, ditto elsewhere

[Ryan Hamilton, 2014/06/23 22:38:52]

Hm. The internal copy of string_piece.h says:

// Prefer passing StringPieces by value:

And it links to a long discussion about why that is ever so slightly faster, and
produces smaller code. If you feel strongly, I can change this. It makes me
wonder if we should sync the advice between the internal and external versions
of string_piece.h

[Lei Zhang, 2014/06/23 22:42:06]

Ok, I should have read string_piece.h, but instead I just looked at a few sample
files on cs and they were all by const ref.

+      const VariationParameters& quic_trial_params);
 
   // Returns true if QUIC time-base loss detection should be negotiated during
   // the QUIC handshake.
-  bool ShouldEnableQuicTimeBasedLossDetection(
+  static bool ShouldEnableQuicTimeBasedLossDetection(
       const base::CommandLine& command_line,
-      base::StringPiece quic_trial_group);
-
-  // Returns true if Chromium should persist QUIC server config information to
-  // disk cache.
-  bool ShouldEnableQuicPersistServerInfo(const base::CommandLine& command_line);
+      base::StringPiece quic_trial_group,
+      const VariationParameters& quic_trial_params);
 
   // Returns the maximum length for QUIC packets, based on any flags in
   // |command_line| or the field trial.  Returns 0 if there is an error
   // parsing any of the options, or if the default value should be used.
-  size_t GetQuicMaxPacketLength(const base::CommandLine& command_line,
-                                base::StringPiece quic_trial_group);
+  static size_t GetQuicMaxPacketLength(
+      const base::CommandLine& command_line,
+      base::StringPiece quic_trial_group,
+      const VariationParameters& quic_trial_params);
 
-  // Returns the quic versions specified by any flags in |command_line|.
-  net::QuicVersion GetQuicVersion(const base::CommandLine& command_line);
+  // Returns the QUIC versions specified by any flags in |command_line|
+  // or |quic_trial_params|.
+  static net::QuicVersion GetQuicVersion(
+      const base::CommandLine& command_line,
+      const VariationParameters& quic_trial_params);
+
+  // Returns the QUIC version specified by |quic_version| or
+  // QUIC_VERSION_UNSUPPORTED if |quic_version| is invalid.
+  static net::QuicVersion ParseQuicVersion(const std::string& quic_version);
+
+  // Returns the QUIC connection options specified by any flags in
+  // |command_line| or |quic_trial_params|.
+  static net::QuicTagVector GetQuicConnectionOptions(
+      const base::CommandLine& command_line,
+      const VariationParameters& quic_trial_params);
+
+  // Returns the list of QUIC tags represented by the comma separated
+  // string in |connection_options|.
+  static net::QuicTagVector ParseQuicConnectionOptions(
+      const std::string& connection_options);
 
   // The NetLog is owned by the browser process, to allow logging from other
   // threads during shutdown, but is used most frequently on the IOThread.
   ChromeNetLog* net_log_;
 
   // The extensions::EventRouterForwarder allows for sending events to
   // extensions from the IOThread.
   extensions::EventRouterForwarder* extension_event_router_forwarder_;
 
   // These member variables are basically global, but their lifetimes are tied
@@ skipping 41 matching lines @@
   bool is_spdy_disabled_by_policy_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   const base::TimeTicks creation_time_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_