net/http/http_server_properties_manager.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_HTTP_HTTP_SERVER_PROPERTIES_MANAGER_H_
   6 #define NET_HTTP_HTTP_SERVER_PROPERTIES_MANAGER_H_
   7
   8 #include <string>
   9 #include <vector>
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "base/prefs/pref_change_registrar.h"
  15 #include "base/timer/timer.h"
  16 #include "base/values.h"
  17 #include "net/base/host_port_pair.h"
  18 #include "net/http/http_server_properties.h"
  19 #include "net/http/http_server_properties_impl.h"
  20
  21 class PrefService;
  22
  23 namespace base {
  24 class SequencedTaskRunner;
  25 }
  26
  27 namespace net {
  28
  29 ////////////////////////////////////////////////////////////////////////////////
  30 // HttpServerPropertiesManager
  31
  32 // The manager for creating and updating an HttpServerProperties (for example it
  33 // tracks if a server supports SPDY or not).
  34 //
  35 // This class interacts with both the pref thread, where notifications of pref
  36 // changes are received from, and the network thread, which owns it, and it
  37 // persists the changes from network stack whether server supports SPDY or not.
  38 //
  39 // It must be constructed on the pref thread, to set up |pref_task_runner_| and
  40 // the prefs listeners.
  41 //
  42 // ShutdownOnPrefThread must be called from pref thread before destruction, to
  43 // release the prefs listeners on the pref thread.
  44 //
  45 // Class requires that update tasks from the Pref thread can post safely to the
  46 // network thread, so the destruction order must guarantee that if |this|
  47 // exists in pref thread, then a potential destruction on network thread will
  48 // come after any task posted to network thread from that method on pref thread.
  49 // This is used to go through network thread before the actual update starts,
  50 // and grab a WeakPtr.
  51 class NET_EXPORT HttpServerPropertiesManager : public HttpServerProperties {
  52  public:
  53   // Create an instance of the HttpServerPropertiesManager. The lifetime of the
  54   // PrefService objects must be longer than that of the
  55   // HttpServerPropertiesManager object. Must be constructed on the Pref thread.
  56   HttpServerPropertiesManager(
  57       PrefService* pref_service,
  58       const char* pref_path,
  59       scoped_refptr<base::SequencedTaskRunner> network_task_runner);
  60   virtual ~HttpServerPropertiesManager();
  61
  62   // Initialize on Network thread.
  63   void InitializeOnNetworkThread();
  64
  65   // Prepare for shutdown. Must be called on the Pref thread before destruction.
  66   void ShutdownOnPrefThread();
  67
  68   // Helper function for unit tests to set the version in the dictionary.
  69   static void SetVersion(base::DictionaryValue* http_server_properties_dict,
  70                          int version_number);
  71
  72   // Deletes all data. Works asynchronously, but if a |completion| callback is
  73   // provided, it will be fired on the pref thread when everything is done.
  74   void Clear(const base::Closure& completion);
  75
  76   // ----------------------------------
  77   // HttpServerProperties methods:
  78   // ----------------------------------
  79
  80   // Gets a weak pointer for this object.
  81   virtual base::WeakPtr<HttpServerProperties> GetWeakPtr() OVERRIDE;
  82
  83   // Deletes all data. Works asynchronously.
  84   virtual void Clear() OVERRIDE;
  85
  86   // Returns true if |server| supports SPDY. Should only be called from IO
  87   // thread.
  88   virtual bool SupportsSpdy(const HostPortPair& server) OVERRIDE;
  89
  90   // Add |server| as the SPDY server which supports SPDY protocol into the
  91   // persisitent store. Should only be called from IO thread.
  92   virtual void SetSupportsSpdy(const HostPortPair& server,
  93                                bool support_spdy) OVERRIDE;
  94
  95   // Returns true if |server| has an Alternate-Protocol header.
  96   virtual bool HasAlternateProtocol(const HostPortPair& server) OVERRIDE;
  97
  98   // Returns the Alternate-Protocol and port for |server|.
  99   // HasAlternateProtocol(server) must be true.
 100   virtual AlternateProtocolInfo GetAlternateProtocol(
 101       const HostPortPair& server) OVERRIDE;
 102
 103   // Sets the Alternate-Protocol for |server|.
 104   virtual void SetAlternateProtocol(
 105       const HostPortPair& server,
 106       uint16 alternate_port,
 107       AlternateProtocol alternate_protocol,
 108       double alternate_probability) OVERRIDE;
 109
 110   // Sets the Alternate-Protocol for |server| to be BROKEN.
 111   virtual void SetBrokenAlternateProtocol(const HostPortPair& server) OVERRIDE;
 112
 113   // Returns true if Alternate-Protocol for |server| was recently BROKEN.
 114   virtual bool WasAlternateProtocolRecentlyBroken(
 115       const HostPortPair& server) OVERRIDE;
 116
 117   // Confirms that Alternate-Protocol for |server| is working.
 118   virtual void ConfirmAlternateProtocol(const HostPortPair& server) OVERRIDE;
 119
 120   // Clears the Alternate-Protocol for |server|.
 121   virtual void ClearAlternateProtocol(const HostPortPair& server) OVERRIDE;
 122
 123   // Returns all Alternate-Protocol mappings.
 124   virtual const AlternateProtocolMap& alternate_protocol_map() const OVERRIDE;
 125
 126   virtual void SetAlternateProtocolExperiment(
 127       AlternateProtocolExperiment experiment) OVERRIDE;
 128
 129   virtual void SetAlternateProtocolProbabilityThreshold(
 130       double threshold) OVERRIDE;
 131
 132   virtual AlternateProtocolExperiment GetAlternateProtocolExperiment()
 133       const OVERRIDE;
 134
 135   // Gets a reference to the SettingsMap stored for a host.
 136   // If no settings are stored, returns an empty SettingsMap.
 137   virtual const SettingsMap& GetSpdySettings(
 138       const HostPortPair& host_port_pair) OVERRIDE;
 139
 140   // Saves an individual SPDY setting for a host. Returns true if SPDY setting
 141   // is to be persisted.
 142   virtual bool SetSpdySetting(const HostPortPair& host_port_pair,
 143                               SpdySettingsIds id,
 144                               SpdySettingsFlags flags,
 145                               uint32 value) OVERRIDE;
 146
 147   // Clears all SPDY settings for a host.
 148   virtual void ClearSpdySettings(const HostPortPair& host_port_pair) OVERRIDE;
 149
 150   // Clears all SPDY settings for all hosts.
 151   virtual void ClearAllSpdySettings() OVERRIDE;
 152
 153   // Returns all SPDY persistent settings.
 154   virtual const SpdySettingsMap& spdy_settings_map() const OVERRIDE;
 155
 156   virtual void SetServerNetworkStats(const HostPortPair& host_port_pair,
 157                                      NetworkStats stats) OVERRIDE;
 158
 159   virtual const NetworkStats* GetServerNetworkStats(
 160       const HostPortPair& host_port_pair) const OVERRIDE;
 161
 162  protected:
 163   // --------------------
 164   // SPDY related methods
 165
 166   // These are used to delay updating of the cached data in
 167   // |http_server_properties_impl_| while the preferences are changing, and
 168   // execute only one update per simultaneous prefs changes.
 169   void ScheduleUpdateCacheOnPrefThread();
 170
 171   // Starts the timers to update the cached prefs. This are overridden in tests
 172   // to prevent the delay.
 173   virtual void StartCacheUpdateTimerOnPrefThread(base::TimeDelta delay);
 174
 175   // Update cached prefs in |http_server_properties_impl_| with data from
 176   // preferences. It gets the data on pref thread and calls
 177   // UpdateSpdyServersFromPrefsOnNetworkThread() to perform the update on
 178   // network thread.
 179   virtual void UpdateCacheFromPrefsOnPrefThread();
 180
 181   // Starts the update of cached prefs in |http_server_properties_impl_| on the
 182   // network thread. Protected for testing.
 183   void UpdateCacheFromPrefsOnNetworkThread(
 184       std::vector<std::string>* spdy_servers,
 185       SpdySettingsMap* spdy_settings_map,
 186       AlternateProtocolMap* alternate_protocol_map,
 187       AlternateProtocolExperiment alternate_protocol_experiment,
 188       bool detected_corrupted_prefs);
 189
 190   // These are used to delay updating the preferences when cached data in
 191   // |http_server_properties_impl_| is changing, and execute only one update per
 192   // simultaneous spdy_servers or spdy_settings or alternate_protocol changes.
 193   void ScheduleUpdatePrefsOnNetworkThread();
 194
 195   // Starts the timers to update the prefs from cache. This are overridden in
 196   // tests to prevent the delay.
 197   virtual void StartPrefsUpdateTimerOnNetworkThread(base::TimeDelta delay);
 198
 199   // Update prefs::kHttpServerProperties in preferences with the cached data
 200   // from |http_server_properties_impl_|. This gets the data on network thread
 201   // and posts a task (UpdatePrefsOnPrefThread) to update preferences on pref
 202   // thread.
 203   void UpdatePrefsFromCacheOnNetworkThread();
 204
 205   // Same as above, but fires an optional |completion| callback on pref thread
 206   // when finished. Virtual for testing.
 207   virtual void UpdatePrefsFromCacheOnNetworkThread(
 208       const base::Closure& completion);
 209
 210   // Update prefs::kHttpServerProperties preferences on pref thread. Executes an
 211   // optional |completion| callback when finished. Protected for testing.
 212   void UpdatePrefsOnPrefThread(base::ListValue* spdy_server_list,
 213                                SpdySettingsMap* spdy_settings_map,
 214                                AlternateProtocolMap* alternate_protocol_map,
 215                                const base::Closure& completion);
 216
 217  private:
 218   void OnHttpServerPropertiesChanged();
 219
 220   // -----------
 221   // Pref thread
 222   // -----------
 223
 224   const scoped_refptr<base::SequencedTaskRunner> pref_task_runner_;
 225
 226   base::WeakPtr<HttpServerPropertiesManager> pref_weak_ptr_;
 227
 228   // Used to post cache update tasks.
 229   scoped_ptr<base::OneShotTimer<HttpServerPropertiesManager> >
 230       pref_cache_update_timer_;
 231
 232   // Used to track the spdy servers changes.
 233   PrefChangeRegistrar pref_change_registrar_;
 234   PrefService* pref_service_;  // Weak.
 235   bool setting_prefs_;
 236   const char* path_;
 237
 238   // --------------
 239   // Network thread
 240   // --------------
 241
 242   const scoped_refptr<base::SequencedTaskRunner> network_task_runner_;
 243
 244   // Used to post |prefs::kHttpServerProperties| pref update tasks.
 245   scoped_ptr<base::OneShotTimer<HttpServerPropertiesManager> >
 246       network_prefs_update_timer_;
 247
 248   scoped_ptr<HttpServerPropertiesImpl> http_server_properties_impl_;
 249
 250   // Used to get |weak_ptr_| to self on the pref thread.
 251   scoped_ptr<base::WeakPtrFactory<HttpServerPropertiesManager> >
 252       pref_weak_ptr_factory_;
 253
 254   // Used to get |weak_ptr_| to self on the network thread.
 255   scoped_ptr<base::WeakPtrFactory<HttpServerPropertiesManager> >
 256       network_weak_ptr_factory_;
 257
 258   DISALLOW_COPY_AND_ASSIGN(HttpServerPropertiesManager);
 259 };
 260
 261 }  // namespace net
 262
 263 #endif  // NET_HTTP_HTTP_SERVER_PROPERTIES_MANAGER_H_