Update gRPC

- Update gRPC and it's dependencies to 0.13.2
- Use pre-defined default port if not specified by URI
- Cosmetic fixes

Change-Id: Iac8c3ba4c6fe1b5925ea8832e61d313adfad6f71
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderRegistryClientProxy.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderRegistryClientProxy.java
index 630b64d..766dd1a 100644
--- a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderRegistryClientProxy.java
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderRegistryClientProxy.java
@@ -55,7 +55,7 @@
 
         // Create session
         DeviceProviderServiceClientProxy pService = new DeviceProviderServiceClientProxy(provider, channel);
-        log.debug("Created DeviceProviderServiceClientProxy", pService);
+        log.debug("Created DeviceProviderServiceClientProxy {}", pService);
 
         DeviceProviderServiceClientProxy old = pServices.put(provider, pService);
         if (old != null) {
@@ -68,7 +68,7 @@
     @Override
     public synchronized void unregister(DeviceProvider provider) {
         DeviceProviderServiceClientProxy pService = pServices.remove(provider);
-        log.debug("Unregistering DeviceProviderServiceClientProxy", pService);
+        log.debug("Unregistering DeviceProviderServiceClientProxy {}", pService);
         super.unregister(provider);
         if (pService != null) {
             pService.shutdown();
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceProvider.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceProvider.java
index 71a83c9..955a657 100644
--- a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceProvider.java
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceProvider.java
@@ -58,7 +58,7 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected RemoteServiceProviderRegistry rpcRegistry;
 
-    private Map<URI, ManagedChannel> channels = new ConcurrentHashMap<>();
+    private final Map<URI, ManagedChannel> channels = new ConcurrentHashMap<>();
 
     private RemoteServiceContextProviderService providerService;
 
@@ -67,8 +67,8 @@
     protected void activate() {
         providerService = rpcRegistry.register(this);
 
-        // FIXME remove me. test code to see if gRPC loads in karaf
-        //getChannel(URI.create("grpc://localhost:8080"));
+        // Uncomment to test if gRPC can be loaded in karaf
+        //getChannel(URI.create("grpc://localhost:11984"));
 
         log.info("Started");
     }
@@ -111,7 +111,11 @@
 
     private ManagedChannel createChannel(URI uri) {
         log.debug("Creating channel for {}", uri);
-        return NettyChannelBuilder.forAddress(uri.getHost(), uri.getPort())
+        int port = GrpcRemoteServiceServer.DEFAULT_LISTEN_PORT;
+        if (uri.getPort() != -1) {
+            port = uri.getPort();
+        }
+        return NettyChannelBuilder.forAddress(uri.getHost(), port)
                 .negotiationType(NegotiationType.PLAINTEXT)
                 .build();
     }
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceServer.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceServer.java
index 77d1cbe..f14b4ef 100644
--- a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceServer.java
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceServer.java
@@ -165,6 +165,7 @@
      * Unregisters all registered LinkProviders.
      */
     private synchronized void unregisterLinkProviders() {
+        // TODO remove all links registered by these providers
         linkProviders.values().forEach(linkProviderRegistry::unregister);
         linkProviders.clear();
         linkProviderServices.clear();
@@ -250,6 +251,7 @@
                 // TODO Do we care about provider name?
                 pairedProvider.setProviderId(new ProviderId(registerProvider.getProviderScheme(), RPC_PROVIDER_NAME));
                 registeredProviders.add(pairedProvider);
+                log.info("registering DeviceProvider {} via gRPC", pairedProvider.id());
                 deviceProviderService = deviceProviderRegistry.register(pairedProvider);
                 break;
 
@@ -319,8 +321,13 @@
         @Override
         public void onError(Throwable e) {
             log.error("DeviceProviderServiceServerProxy#onError", e);
-            deviceProviderRegistry.unregister(pairedProvider);
-            registeredProviders.remove(pairedProvider);
+            if (pairedProvider != null) {
+                // TODO call deviceDisconnected against all devices
+                // registered for this provider scheme
+                log.info("unregistering DeviceProvider {} via gRPC", pairedProvider.id());
+                deviceProviderRegistry.unregister(pairedProvider);
+                registeredProviders.remove(pairedProvider);
+            }
             // TODO What is the proper clean up for bi-di stream on error?
             // sample suggests no-op
             toDeviceProvider.onError(e);
@@ -364,6 +371,7 @@
 
         /**
          * Registers RPC stream in other direction.
+         *
          * @param deviceProviderServiceProxy {@link DeviceProviderServiceServerProxy}
          */
         void pair(DeviceProviderServiceServerProxy deviceProviderServiceProxy) {
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/LinkProviderServiceServerProxy.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/LinkProviderServiceServerProxy.java
index 80322dc..bf35ed2 100644
--- a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/LinkProviderServiceServerProxy.java
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/LinkProviderServiceServerProxy.java
@@ -51,6 +51,9 @@
 
     private final GrpcRemoteServiceServer server;
 
+    // TODO implement aging mechanism to automatically remove
+    // stale links reported by dead client, etc.
+
     LinkProviderServiceServerProxy(GrpcRemoteServiceServer server) {
         this.server = checkNotNull(server);
     }