sync/notifier/gcm_network_channel.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 SYNC_NOTIFIER_GCM_NETWORK_CHANNEL_H_
   6 #define SYNC_NOTIFIER_GCM_NETWORK_CHANNEL_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/threading/non_thread_safe.h"
  14 #include "net/base/backoff_entry.h"
  15 #include "net/base/network_change_notifier.h"
  16 #include "net/url_request/url_fetcher_delegate.h"
  17 #include "sync/base/sync_export.h"
  18 #include "sync/notifier/gcm_network_channel_delegate.h"
  19 #include "sync/notifier/sync_system_resources.h"
  20 #include "url/gurl.h"
  21
  22 class GoogleServiceAuthError;
  23
  24 namespace syncer {
  25 class GCMNetworkChannel;
  26
  27 // POD with copy of some statuses for debugging purposes.
  28 struct GCMNetworkChannelDiagnostic {
  29   explicit GCMNetworkChannelDiagnostic(GCMNetworkChannel* parent);
  30
  31   // Collect all the internal variables in a single readable dictionary.
  32   scoped_ptr<base::DictionaryValue> CollectDebugData() const;
  33
  34   // TODO(pavely): Move this toString to a more appropiate place in GCMClient.
  35   std::string GCMClientResultToString(
  36       const gcm::GCMClient::Result result) const;
  37
  38   GCMNetworkChannel* parent_;
  39   bool last_message_empty_echo_token_;
  40   base::Time last_message_received_time_;
  41   int last_post_response_code_;
  42   std::string registration_id_;
  43   gcm::GCMClient::Result registration_result_;
  44   int sent_messages_count_;
  45 };
  46
  47 // GCMNetworkChannel is an implementation of SyncNetworkChannel that routes
  48 // messages through GCMService.
  49 class SYNC_EXPORT_PRIVATE GCMNetworkChannel
  50     : public SyncNetworkChannel,
  51       public net::URLFetcherDelegate,
  52       public net::NetworkChangeNotifier::NetworkChangeObserver,
  53       public base::NonThreadSafe {
  54  public:
  55   GCMNetworkChannel(
  56       scoped_refptr<net::URLRequestContextGetter> request_context_getter,
  57       scoped_ptr<GCMNetworkChannelDelegate> delegate);
  58
  59   virtual ~GCMNetworkChannel();
  60
  61   // invalidation::NetworkChannel implementation.
  62   virtual void SendMessage(const std::string& message) OVERRIDE;
  63   virtual void SetMessageReceiver(
  64       invalidation::MessageCallback* incoming_receiver) OVERRIDE;
  65
  66   // SyncNetworkChannel implementation.
  67   virtual void UpdateCredentials(const std::string& email,
  68                                  const std::string& token) OVERRIDE;
  69   virtual int GetInvalidationClientType() OVERRIDE;
  70   virtual void RequestDetailedStatus(
  71       base::Callback<void(const base::DictionaryValue&)> callback) OVERRIDE;
  72
  73   // URLFetcherDelegate implementation.
  74   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
  75
  76   // NetworkChangeObserver implementation.
  77   virtual void OnNetworkChanged(
  78       net::NetworkChangeNotifier::ConnectionType connection_type) OVERRIDE;
  79
  80  protected:
  81   void ResetRegisterBackoffEntryForTest(
  82       const net::BackoffEntry::Policy* policy);
  83
  84   virtual GURL BuildUrl(const std::string& registration_id);
  85
  86  private:
  87   friend class GCMNetworkChannelTest;
  88   void Register();
  89   void OnRegisterComplete(const std::string& registration_id,
  90                           gcm::GCMClient::Result result);
  91   void RequestAccessToken();
  92   void OnGetTokenComplete(const GoogleServiceAuthError& error,
  93                           const std::string& token);
  94   void OnIncomingMessage(const std::string& message,
  95                          const std::string& echo_token);
  96
  97   // Base64 encoding/decoding with URL safe alphabet.
  98   // http://tools.ietf.org/html/rfc4648#page-7
  99   static void Base64EncodeURLSafe(const std::string& input,
 100                                   std::string* output);
 101   static bool Base64DecodeURLSafe(const std::string& input,
 102                                   std::string* output);
 103
 104   scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
 105   scoped_ptr<GCMNetworkChannelDelegate> delegate_;
 106
 107   // Message is saved until all conditions are met: there is valid
 108   // registration_id and access_token.
 109   std::string cached_message_;
 110
 111   // Access token is saved because in case of auth failure from server we need
 112   // to invalidate it.
 113   std::string access_token_;
 114
 115   // GCM registration_id is requested one at startup and never refreshed until
 116   // next restart.
 117   std::string registration_id_;
 118   scoped_ptr<net::BackoffEntry> register_backoff_entry_;
 119
 120   scoped_ptr<net::URLFetcher> fetcher_;
 121
 122   // cacheinvalidation client receives echo_token with incoming message from
 123   // GCM and shuld include it in headers with outgoing message over http.
 124   std::string echo_token_;
 125
 126   GCMNetworkChannelDiagnostic diagnostic_info_;
 127
 128   base::WeakPtrFactory<GCMNetworkChannel> weak_factory_;
 129
 130   DISALLOW_COPY_AND_ASSIGN(GCMNetworkChannel);
 131 };
 132
 133 }  // namespace syncer
 134
 135 #endif  // SYNC_NOTIFIER_GCM_NETWORK_CHANNEL_H_