More information for debugging.

- Include transport information in RPC's final status
- Implement toString() of transports

core/src/main/java/io/grpc/inprocess/InProcessTransport.java

@@ -164,6 +164,11 @@ class InProcessTransport implements ServerTransport, ClientTransport {
     }
   }
 
+  @Override
+  public String toString() {
+    return getClass().getSimpleName() + "(" + name + ")";
+  }
+
   private synchronized void notifyShutdown(Status s) {
     if (shutdown) {
       return;

core/src/main/java/io/grpc/internal/ClientCallImpl.java

@@ -434,7 +434,14 @@ final class ClientCallImpl<ReqT, RespT> extends ClientCall<ReqT, RespT>
           trailers = new Metadata();
         }
       }
-      final Status savedStatus = status;
+      ClientTransport transport = null;
+      try {
+        transport = transportFuture.get();
+      } catch (Exception e) {
+        // Ignore the exception, and keep transport as null.
+      }
+      final Status savedStatus = (transport == null
+          ? status : status.augmentDescription("transport=" + transport));
       final Metadata savedTrailers = trailers;
       callExecutor.execute(new ContextRunnable(context) {
         @Override

core/src/test/java/io/grpc/internal/ManagedChannelImplTest.java

@@ -158,8 +158,7 @@ public class ManagedChannelImplTest {
     ClientCall<String, Integer> call =
         channel.newCall(method, CallOptions.DEFAULT.withDeadlineNanoTime(System.nanoTime()));
     call.start(mockCallListener, new Metadata());
-    verify(mockCallListener, timeout(1000)).onClose(
-        same(Status.DEADLINE_EXCEEDED), any(Metadata.class));
+    verifyListenerClosed(mockCallListener, Status.Code.DEADLINE_EXCEEDED);
   }
 
   @Test
@@ -211,7 +210,7 @@ public class ManagedChannelImplTest {
     ClientStreamListener streamListener2 = streamListenerCaptor.getValue();
     Metadata trailers = new Metadata();
     streamListener2.closed(Status.CANCELLED, trailers);
-    verify(mockCallListener2, timeout(1000)).onClose(Status.CANCELLED, trailers);
+    verifyListenerClosed(mockCallListener2, Status.Code.CANCELLED);
 
     // Shutdown
     channel.shutdown();
@@ -235,7 +234,7 @@ public class ManagedChannelImplTest {
     transportListener.transportShutdown(Status.CANCELLED);
     assertFalse(channel.isTerminated());
     streamListener.closed(Status.CANCELLED, trailers);
-    verify(mockCallListener, timeout(1000)).onClose(Status.CANCELLED, trailers);
+    verifyListenerClosed(mockCallListener, Status.Code.CANCELLED);
     assertFalse(channel.isTerminated());
 
     transportListener.transportTerminated();
@@ -385,7 +384,7 @@ public class ManagedChannelImplTest {
     call.start(mockCallListener, headers);
     ArgumentCaptor<ClientTransport.Listener> badTransportListenerCaptor =
         ArgumentCaptor.forClass(ClientTransport.Listener.class);
-    verify(mockCallListener, timeout(1000)).onClose(same(Status.UNAVAILABLE), any(Metadata.class));
+    verifyListenerClosed(mockCallListener, Status.Code.UNAVAILABLE);
     verify(badTransport, timeout(1000)).start(badTransportListenerCaptor.capture());
     badTransportListenerCaptor.getValue().transportShutdown(Status.UNAVAILABLE);
 
@@ -396,6 +395,14 @@ public class ManagedChannelImplTest {
         same(method), same(headers), any(ClientStreamListener.class));
   }
 
+  private void verifyListenerClosed(ClientCall.Listener<?> mockCallListener,
+      Status.Code statusCode) {
+    ArgumentCaptor<Status> statusCaptor = ArgumentCaptor.forClass(Status.class);
+    verify(mockCallListener, timeout(1000)).onClose(statusCaptor.capture(), any(Metadata.class));
+    Status status = statusCaptor.getValue();
+    assertEquals(statusCode, status.getCode());
+  }
+
   private static class FakeBackoffPolicyProvider implements BackoffPolicy.Provider {
     @Override
     public BackoffPolicy get() {

grpclb/src/main/java/io/grpc/grpclb/GrpclbLoadBalancer.java

@@ -358,6 +358,7 @@ class GrpclbLoadBalancer extends LoadBalancer {
           if (lbResponseObserver != this) {
             return;
           }
+          logger.info("Received " + status + ", entering fallback mode");
           directTransport = transportFuture = Futures.immediateFuture(lbTransport);
           pendingPicksFulfillmentBatch = pendingPicks.createFulfillmentBatch();
         }

interop-testing/src/main/java/io/grpc/testing/integration/AbstractTransportTest.java

@@ -338,7 +338,8 @@ public abstract class AbstractTransportTest {
     requestObserver.onError(new RuntimeException());
     responseObserver.awaitCompletion();
     assertEquals(Arrays.<StreamingInputCallResponse>asList(), responseObserver.getValues());
-    assertEquals(Status.CANCELLED, Status.fromThrowable(responseObserver.getError()));
+    assertEquals(Status.Code.CANCELLED,
+        Status.fromThrowable(responseObserver.getError()).getCode());
   }
 
   @Test(timeout = 10000)
@@ -366,7 +367,7 @@ public abstract class AbstractTransportTest {
     requestObserver.onError(new RuntimeException());
     ArgumentCaptor<Throwable> captor = ArgumentCaptor.forClass(Throwable.class);
     verify(responseObserver, timeout(OPERATION_TIMEOUT)).onError(captor.capture());
-    assertEquals(Status.CANCELLED, Status.fromThrowable(captor.getValue()));
+    assertEquals(Status.Code.CANCELLED, Status.fromThrowable(captor.getValue()).getCode());
     verifyNoMoreInteractions(responseObserver);
   }
 
@@ -489,7 +490,8 @@ public abstract class AbstractTransportTest {
     // Make sure that everything still completes.
     call.request(1);
     assertEquals(goldenResponses.get(1), queue.poll(OPERATION_TIMEOUT, TimeUnit.MILLISECONDS));
-    assertEquals(Status.OK, queue.poll(OPERATION_TIMEOUT, TimeUnit.MILLISECONDS));
+    assertEquals(Status.Code.OK,
+        ((Status) queue.poll(OPERATION_TIMEOUT, TimeUnit.MILLISECONDS)).getCode());
   }
 
   @Test(timeout = 30000)
@@ -632,7 +634,7 @@ public abstract class AbstractTransportTest {
                .build()).next();
       fail("Expected deadline to be exceeded");
     } catch (Throwable t) {
-      assertEquals(Status.DEADLINE_EXCEEDED, Status.fromThrowable(t));
+      assertEquals(Status.Code.DEADLINE_EXCEEDED, Status.fromThrowable(t).getCode());
     }
   }
 
@@ -655,7 +657,8 @@ public abstract class AbstractTransportTest {
         .withDeadlineAfter(30, TimeUnit.MILLISECONDS)
         .streamingOutputCall(request, recorder);
     recorder.awaitCompletion();
-    assertEquals(Status.DEADLINE_EXCEEDED, Status.fromThrowable(recorder.getError()));
+    assertEquals(Status.Code.DEADLINE_EXCEEDED,
+        Status.fromThrowable(recorder.getError()).getCode());
   }
 
   protected int unaryPayloadLength() {

netty/src/main/java/io/grpc/netty/NettyClientTransport.java

@@ -212,6 +212,11 @@ class NettyClientTransport implements ClientTransport {
     }
   }
 
+  @Override
+  public String toString() {
+    return getClass().getSimpleName() + "(" + address + ")";
+  }
+
   private void notifyShutdown(Status status) {
     Preconditions.checkNotNull(status, "status");
     boolean notifyShutdown;

okhttp/src/main/java/io/grpc/okhttp/OkHttpClientTransport.java

@@ -404,6 +404,11 @@ class OkHttpClientTransport implements ClientTransport {
     });
   }
 
+  @Override
+  public String toString() {
+    return getClass().getSimpleName() + "(" + address + ")";
+  }
+
   /**
    * Gets the overriden authority hostname.  If the authority is overriden to be an invalid
    * authority, uri.getHost() will (rightly) return null, since the authority is no longer