Parse termination reason and propagate the error to the Session interface.

remoting/protocol/session.h

 // Copyright (c) 2011 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_PROTOCOL_SESSION_H_
 #define REMOTING_PROTOCOL_SESSION_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 31 matching lines @@
     // TODO(sergeyu): Remove this state.
     CONNECTED_CHANNELS,
 
     // Session has been closed.
     CLOSED,
 
     // Connection has failed.
     FAILED,
   };
 
+  enum Error {
+    OK = 0,
+    PEER_IS_OFFLINE,
+    SESSION_REJECTED,
+    INCOMPATIBLE_PROTOCOL,
+    CHANNEL_CONNECTION_ERROR,
+  };
+
   typedef Callback1<State>::Type StateChangeCallback;
   typedef base::Callback<void(net::StreamSocket*)> StreamChannelCallback;
   typedef base::Callback<void(net::Socket*)> DatagramChannelCallback;
 
   Session() { }
   virtual ~Session() { }
 
   // Set callback that is called when state of the connection is changed.
   // Must be called on the jingle thread only.
   virtual void SetStateChangeCallback(StateChangeCallback* callback) = 0;
 
+  // Returns error code for a failed session.
+  virtual Error error() = 0;
+
   // Creates new channels for this connection. The specified callback
   // is called when then new channel is created and connected. The
   // callback is called with NULL if connection failed for any reason.
   // Ownership of the channel socket is given to the caller when the
   // callback is called. All channels must be destroyed before the
   // session is destroyed. Can be called only when in CONNECTING or
   // CONNECTED state.
   virtual void CreateStreamChannel(
       const std::string& name, const StreamChannelCallback& callback) = 0;
   virtual void CreateDatagramChannel(
@@ skipping 37 matching lines @@
   virtual void Close() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Session);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_SESSION_H_