Use heartbeat interval received from the bot.

remoting/host/heartbeat_sender.h

 // Copyright (c) 2010 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 REMOTING_HOST_HEARTBEAT_SENDER_H_
 #define REMOTING_HOST_HEARTBEAT_SENDER_H_
 
 #include <string>
 
 #include "base/scoped_ptr.h"
@@ skipping 19 matching lines @@
 //     <rem:signature rem:time="1279061748">.signature.</rem:signature>
 //   </rem:heartbeat>
 // </iq>
 //
 // The time attribute of the signature is the decimal time when the message
 // was sent in second since the epoch (01/01/1970). The signature is a BASE64
 // encoded SHA-1/RSA signature created with the host's private key. The message
 // being signed is the full Jid concatenated with the time value, separated by
 // space. For example, for the heartbeat stanza above the message that is being
 // signed is "user@gmail.com/chromoting123123 1279061748".
+//
+// Bot sends the following result stanza in response to each heartbeat:
+//
+//  <iq type="set" from="remoting@bot.talk.google.com"
+//      to="user@gmail.com/chromoting123123" id="5" xmlns="jabber:client">
+//    <rem:heartbeat-result xmlns:rem="google:remoting">
+//      <rem:set-interval>300</rem:set-interval>
+//    </rem:heartbeat>
+//  </iq>
+//
+// The set-interval tag is used to specify desired heartbeat interval
+// in seconds. The heartbeat-result and the set-interval tags are
+// optional. Host uses default heartbeat interval if it doesn't find
+// set-interval tag in the result Iq stanza it receives from the
+// server.
+//
 // TODO(sergeyu): Is it enough to sign JID and nothing else?
 class HeartbeatSender : public base::RefCountedThreadSafe<HeartbeatSender> {
  public:
   HeartbeatSender();
   virtual ~HeartbeatSender();
 
   // Initializes heart-beating for |jingle_client| with the specified
   // config. Returns false if the config is invalid (e.g. private key
   // cannot be parsed).
   bool Init(MutableHostConfig* config, JingleClient* jingle_client);
 
   // Starts heart-beating. Must be called after init.
   void Start();
 
   // Stops heart-beating. Must be called before corresponding JingleClient
   // is destroyed. This object will not be deleted until Stop() is called,
   // and it may (and will) crash after JingleClient is destroyed. Heartbeating
   // cannot be restarted after it has been stopped, A new sender must be created
   // instead.
   void Stop();
 
  private:
   FRIEND_TEST_ALL_PREFIXES(HeartbeatSenderTest, DoSendStanza);
   FRIEND_TEST_ALL_PREFIXES(HeartbeatSenderTest, CreateHeartbeatMessage);
+  FRIEND_TEST_ALL_PREFIXES(HeartbeatSenderTest, ProcessResponse);
 
   enum State {
     CREATED,
     INITIALIZED,
     STARTED,
     STOPPED,
   };
 
   void DoSendStanza();
 
   // Helper methods used by DoSendStanza() to generate heartbeat stanzas.
   // Caller owns the result.
   buzz::XmlElement* CreateHeartbeatMessage();
   buzz::XmlElement* CreateSignature();
 
   void ProcessResponse(const buzz::XmlElement* response);
 
   State state_;
   scoped_refptr<MutableHostConfig> config_;
   JingleClient* jingle_client_;
   scoped_ptr<IqRequest> request_;
   std::string host_id_;
   HostKeyPair key_pair_;
+  int interval_ms_;
 
   DISALLOW_COPY_AND_ASSIGN(HeartbeatSender);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_HEARTBEAT_SENDER_H_