[GCM] Add ConnectionListener support, and hook up to debug page

The ConnectionFactory::ConnectionListener gets informed of connection events,
including the actual ip endpoint with which a connection was established. This
will eventually be hooked up to app handlers to allow services to act on
connection changes. For now it just allows the debug page to more accurately
reflect the connection state.

BUG=377882

Review URL: https://codereview.chromium.org/317723004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276800 0039d316-1c4b-4281-b951-d872f2087c98

components/gcm_driver/gcm_client_impl.cc

@@ -341,6 +341,7 @@ void GCMClientImpl::InitializeMCSClient(
       network_session_,
       net_log_.net_log(),
       &recorder_);
+  connection_factory_->SetConnectionListener(this);
   mcs_client_ = internals_builder_->BuildMCSClient(
       chrome_build_info_.version,
       clock_.get(),
@@ -711,8 +712,9 @@ GCMClient::GCMStatistics GCMClientImpl::GetStatistics() const {
   stats.is_recording = recorder_.is_recording();
   stats.gcm_client_state = GetStateString();
   stats.connection_client_created = mcs_client_.get() != NULL;
+  if (connection_factory_.get())
+    stats.connection_state = connection_factory_->GetConnectionStateString();
   if (mcs_client_.get()) {
-    stats.connection_state = mcs_client_->GetStateString();
     stats.send_queue_size = mcs_client_->GetSendQueueSize();
     stats.resend_queue_size = mcs_client_->GetResendQueueSize();
   }
@@ -731,6 +733,17 @@ void GCMClientImpl::OnActivityRecorded() {
   delegate_->OnActivityRecorded();
 }
 
+void GCMClientImpl::OnConnected(const GURL& current_server,
+                                const net::IPEndPoint& ip_endpoint) {
+  // TODO(zea): inform GCMClient::Delegate and app handlers as well.
+  delegate_->OnActivityRecorded();
+}
+
+void GCMClientImpl::OnDisconnected() {
+  // TODO(zea): inform GCMClient::Delegate and app handlers as well.
+  delegate_->OnActivityRecorded();
+}
+
 void GCMClientImpl::OnMessageReceivedFromMCS(const gcm::MCSMessage& message) {
   switch (message.tag()) {
     case kLoginResponseTag:

components/gcm_driver/gcm_client_impl.h

@@ -74,12 +74,13 @@ class GCMInternalsBuilder {
 // Checkins. It also allows for registering user delegates that host
 // applications that send and receive messages.
 class GCMClientImpl
-    : public GCMClient, public GCMStatsRecorder::Delegate {
+    : public GCMClient, public GCMStatsRecorder::Delegate,
+      public ConnectionFactory::ConnectionListener {
  public:
   explicit GCMClientImpl(scoped_ptr<GCMInternalsBuilder> internals_builder);
   virtual ~GCMClientImpl();
 
-  // Overridden from GCMClient:
+  // GCMClient implementation.
   virtual void Initialize(
       const ChromeBuildInfo& chrome_build_info,
       const base::FilePath& store_path,
@@ -101,8 +102,15 @@ class GCMClientImpl
   virtual void SetRecording(bool recording) OVERRIDE;
   virtual void ClearActivityLogs() OVERRIDE;
   virtual GCMStatistics GetStatistics() const OVERRIDE;
+
+  // GCMStatsRecorder::Delegate implemenation.
   virtual void OnActivityRecorded() OVERRIDE;
 
+  // ConnectionFactory::ConnectionListener implementation.
+  virtual void OnConnected(const GURL& current_server,
+                           const net::IPEndPoint& ip_endpoint) OVERRIDE;
+  virtual void OnDisconnected() OVERRIDE;
+
  private:
   // State representation of the GCMClient.
   // Any change made to this enum should have corresponding change in the

google_apis/gcm/engine/connection_factory.cc

@@ -6,6 +6,9 @@
 
 namespace gcm {
 
+ConnectionFactory::ConnectionListener::ConnectionListener() {}
+ConnectionFactory::ConnectionListener::~ConnectionListener() {}
+
 ConnectionFactory::ConnectionFactory() {}
 ConnectionFactory::~ConnectionFactory() {}
 

google_apis/gcm/engine/connection_factory.h

@@ -5,10 +5,18 @@
 #ifndef GOOGLE_APIS_GCM_ENGINE_CONNECTION_FACTORY_H_
 #define GOOGLE_APIS_GCM_ENGINE_CONNECTION_FACTORY_H_
 
+#include <string>
+
 #include "base/time/time.h"
 #include "google_apis/gcm/base/gcm_export.h"
 #include "google_apis/gcm/engine/connection_handler.h"
 
+class GURL;
+
+namespace net {
+class IPEndPoint;
+}
+
 namespace mcs_proto {
 class LoginRequest;
 }
@@ -36,6 +44,22 @@ class GCM_EXPORT ConnectionFactory {
     CONNECTION_RESET_COUNT,
   };
 
+  // Listener interface to be notified of endpoint connection events.
+  class GCM_EXPORT ConnectionListener {
+   public:
+    ConnectionListener();
+    virtual ~ConnectionListener();
+
+    // Notifies the listener that GCM has performed a handshake with and is now
+    // actively connected to |current_server|. |ip_endpoint| is the resolved
+    // ip address/port through which the connection is being made.
+    virtual void OnConnected(const GURL& current_server,
+                             const net::IPEndPoint& ip_endpoint) = 0;
+
+    // Notifies the listener that the connection has been interrupted.
+    virtual void OnDisconnected() = 0;
+  };
+
   ConnectionFactory();
   virtual ~ConnectionFactory();
 
@@ -66,6 +90,9 @@ class GCM_EXPORT ConnectionFactory {
   // connection.
   virtual bool IsEndpointReachable() const = 0;
 
+  // Returns a debug string describing the connection state.
+  virtual std::string GetConnectionStateString() const = 0;
+
   // If in backoff, the time at which the next retry will be made. Otherwise,
   // a null time, indicating either no attempt to connect has been made or no
   // backoff is in progress.
@@ -76,6 +103,11 @@ class GCM_EXPORT ConnectionFactory {
   // If the last connection was made within kConnectionResetWindowSecs, the old
   // backoff is restored, else a new backoff kicks off.
   virtual void SignalConnectionReset(ConnectionResetReason reason) = 0;
+
+  // Sets the current connection listener. Only one listener is supported at a
+  // time, and the listener must either outlive the connection factory or
+  // call SetConnectionListener(NULL) upon destruction.
+  virtual void SetConnectionListener(ConnectionListener* listener) = 0;
 };
 
 }  // namespace gcm

google_apis/gcm/engine/connection_factory_impl.cc

@@ -59,6 +59,7 @@ ConnectionFactoryImpl::ConnectionFactoryImpl(
     waiting_for_backoff_(false),
     logging_in_(false),
     recorder_(recorder),
+    listener_(NULL),
     weak_ptr_factory_(this) {
   DCHECK_GE(mcs_endpoints_.size(), 1U);
 }
@@ -140,6 +141,18 @@ bool ConnectionFactoryImpl::IsEndpointReachable() const {
   return connection_handler_ && connection_handler_->CanSendMessage();
 }
 
+std::string ConnectionFactoryImpl::GetConnectionStateString() const {
+  if (IsEndpointReachable())
+    return "CONNECTED";
+  if (logging_in_)
+    return "LOGGING IN";
+  if (connecting_)
+    return "CONNECTING";
+  if (waiting_for_backoff_)
+    return "WAITING FOR BACKOFF";
+  return "NOT CONNECTED";
+}
+
 void ConnectionFactoryImpl::SignalConnectionReset(
     ConnectionResetReason reason) {
   // A failure can trigger multiple resets, so no need to do anything if a
@@ -149,6 +162,9 @@ void ConnectionFactoryImpl::SignalConnectionReset(
     return;
   }
 
+  if (listener_)
+    listener_->OnDisconnected();
+
   UMA_HISTOGRAM_ENUMERATION("GCM.ConnectionResetReason",
                             reason,
                             CONNECTION_RESET_COUNT);
@@ -202,6 +218,11 @@ void ConnectionFactoryImpl::SignalConnectionReset(
   Connect();
 }
 
+void ConnectionFactoryImpl::SetConnectionListener(
+    ConnectionListener* listener) {
+  listener_ = listener;
+}
+
 base::TimeTicks ConnectionFactoryImpl::NextRetryAttempt() const {
   if (!backoff_entry_)
     return base::TimeTicks();
@@ -234,6 +255,18 @@ GURL ConnectionFactoryImpl::GetCurrentEndpoint() const {
   return mcs_endpoints_[next_endpoint_];
 }
 
+net::IPEndPoint ConnectionFactoryImpl::GetPeerIP() {
+  if (!socket_handle_.socket())
+    return net::IPEndPoint();
+
+  net::IPEndPoint ip_endpoint;
+  int result = socket_handle_.socket()->GetPeerAddress(&ip_endpoint);
+  if (result != net::OK)
+    return net::IPEndPoint();
+
+  return ip_endpoint;
+}
+
 void ConnectionFactoryImpl::ConnectImpl() {
   DCHECK(!IsEndpointReachable());
   DCHECK(!socket_handle_.socket());
@@ -348,6 +381,9 @@ void ConnectionFactoryImpl::ConnectionHandlerCallback(int result) {
   previous_backoff_.swap(backoff_entry_);
   backoff_entry_->Reset();
   logging_in_ = false;
+
+  if (listener_)
+    listener_->OnConnected(GetCurrentEndpoint(), GetPeerIP());
 }
 
 // This has largely been copied from

google_apis/gcm/engine/connection_factory_impl.h

@@ -48,8 +48,10 @@ class GCM_EXPORT ConnectionFactoryImpl :
   virtual ConnectionHandler* GetConnectionHandler() const OVERRIDE;
   virtual void Connect() OVERRIDE;
   virtual bool IsEndpointReachable() const OVERRIDE;
+  virtual std::string GetConnectionStateString() const OVERRIDE;
   virtual base::TimeTicks NextRetryAttempt() const OVERRIDE;
   virtual void SignalConnectionReset(ConnectionResetReason reason) OVERRIDE;
+  virtual void SetConnectionListener(ConnectionListener* listener) OVERRIDE;
 
   // NetworkChangeNotifier observer implementations.
   virtual void OnConnectionTypeChanged(
@@ -61,6 +63,10 @@ class GCM_EXPORT ConnectionFactoryImpl :
   // attempt will be made.
   GURL GetCurrentEndpoint() const;
 
+  // Returns the IPEndpoint to which the factory is currently connected. If no
+  // connection is active, returns an empty IPEndpoint.
+  net::IPEndPoint GetPeerIP();
+
  protected:
   // Implementation of Connect(..). If not in backoff, uses |login_request_|
   // in attempting a connection/handshake. On connection/handshake failure, goes
@@ -161,6 +167,9 @@ class GCM_EXPORT ConnectionFactoryImpl :
   // Recorder that records GCM activities for debugging purpose. Not owned.
   GCMStatsRecorder* recorder_;
 
+  // Listener for connection change events.
+  ConnectionListener* listener_;
+
   base::WeakPtrFactory<ConnectionFactoryImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectionFactoryImpl);