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netty: return status code unavailable when netty channel has unresolved InetSocketAddress #7023

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merged 3 commits into from May 21, 2020
Merged

netty: return status code unavailable when netty channel has unresolved InetSocketAddress #7023

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71f56cb
netty: add check for UnresolvedAddressException for netty channels wi…
reggiemcdonald May 8, 2020
52a7b3a
netty: make netty transport test more lightweight
reggiemcdonald May 10, 2020
02ec5f8
netty: change try-catch to try-finally for better clarity
reggiemcdonald May 11, 2020
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3 changes: 2 additions & 1 deletion netty/src/main/java/io/grpc/netty/NettyChannelBuilder.java
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Expand Up @@ -103,7 +103,8 @@ public final class NettyChannelBuilder
* Creates a new builder with the given server address. This factory method is primarily intended
* for using Netty Channel types other than SocketChannel. {@link #forAddress(String, int)} should
* generally be preferred over this method, since that API permits delaying DNS lookups and
* noticing changes to DNS.
* noticing changes to DNS. If an unresolved InetSocketAddress is passed in, then it will remain
* unresolved.
*/
@CheckReturnValue
public static NettyChannelBuilder forAddress(SocketAddress serverAddress) {
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4 changes: 4 additions & 0 deletions netty/src/main/java/io/grpc/netty/Utils.java
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Expand Up @@ -54,6 +54,7 @@
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.UnresolvedAddressException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ThreadFactory;
Expand Down Expand Up @@ -270,6 +271,9 @@ public static Status statusFromThrowable(Throwable t) {
if (t instanceof IOException) {
return Status.UNAVAILABLE.withDescription("io exception").withCause(t);
}
if (t instanceof UnresolvedAddressException) {
return Status.UNAVAILABLE.withDescription("unresolved address").withCause(t);
}
if (t instanceof Http2Exception) {
return Status.INTERNAL.withDescription("http2 exception").withCause(t);
}
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36 changes: 36 additions & 0 deletions netty/src/test/java/io/grpc/netty/NettyTransportTest.java
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Expand Up @@ -16,16 +16,30 @@

package io.grpc.netty;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import io.grpc.CallOptions;
import io.grpc.ManagedChannel;
import io.grpc.ServerStreamTracer;
import io.grpc.Status;
import io.grpc.StatusRuntimeException;
import io.grpc.internal.AbstractTransportTest;
import io.grpc.internal.ClientTransportFactory;
import io.grpc.internal.FakeClock;
import io.grpc.internal.InternalServer;
import io.grpc.internal.ManagedClientTransport;
import io.grpc.stub.ClientCalls;
import io.grpc.testing.GrpcCleanupRule;
import io.grpc.testing.TestMethodDescriptors;
import java.net.InetSocketAddress;
import java.nio.channels.UnresolvedAddressException;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.junit.After;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

Expand All @@ -44,6 +58,9 @@ public class NettyTransportTest extends AbstractTransportTest {
.setTransportTracerFactory(fakeClockTransportTracer)
.buildTransportFactory();

@Rule
public final GrpcCleanupRule grpcCleanupRule = new GrpcCleanupRule();

@Override
protected boolean haveTransportTracer() {
return true;
Expand Down Expand Up @@ -106,4 +123,23 @@ protected ManagedClientTransport newClientTransport(InternalServer server) {
public void clientChecksInboundMetadataSize_trailer() throws Exception {
// Server-side is flaky due to https://github.com/netty/netty/pull/8332
}

@Test
public void channelHasUnresolvedHostname() throws Exception {
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server = null;
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ManagedChannel channel = NettyChannelBuilder
.forAddress(new InetSocketAddress("invalid", 1234))
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InetSocketAddress.createUnresolved()

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ahh missed this in the docs. Thanks!

.build();
grpcCleanupRule.register(channel);
try {
ClientCalls.blockingUnaryCall(channel, TestMethodDescriptors.voidMethod(),
CallOptions.DEFAULT, null);
fail("exception should have been thrown");
} catch (StatusRuntimeException e) {
Status status = e.getStatus();
assertEquals(Status.Code.UNAVAILABLE, status.getCode());
assertTrue(status.getCause() instanceof UnresolvedAddressException);
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You can leave it as-is, but I'll note that assertTrue/assertFalse commonly produce poor error messages if they fail.

This is one of the biggest reasons using Truth can be nice. With Truth, this would be assertThat(status.getCause()).isinstanceof(UnresolvedAddressException.class) (assertThat is typically a static import from the Truth class). Then if it fails, instead of saying "expected true but was false" it can say "expected UnresolvedAddressException but was SomeOtherException" which can greatly aid debugging. It's possible to do that with the JUnit assertion, but you have to create a string and pass it as the first argument. Something to consider for the future.

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I like that a lot better! Change made

assertEquals("unresolved address", status.getDescription());
}
}
}
3 changes: 3 additions & 0 deletions netty/src/test/java/io/grpc/netty/UtilsTest.java
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Expand Up @@ -42,6 +42,7 @@
import io.netty.handler.codec.http2.Http2Exception;
import io.netty.handler.codec.http2.Http2Headers;
import io.netty.util.AsciiString;
import java.nio.channels.UnresolvedAddressException;
import java.util.Map;
import org.junit.Test;
import org.junit.runner.RunWith;
Expand All @@ -61,6 +62,8 @@ public void testStatusFromThrowable() {
Throwable t;
t = new ConnectTimeoutException("msg");
assertStatusEquals(Status.UNAVAILABLE.withCause(t), Utils.statusFromThrowable(t));
t = new UnresolvedAddressException();
assertStatusEquals(Status.UNAVAILABLE.withCause(t), Utils.statusFromThrowable(t));
t = new Http2Exception(Http2Error.INTERNAL_ERROR, "msg");
assertStatusEquals(Status.INTERNAL.withCause(t), Utils.statusFromThrowable(t));
t = new Exception("msg");
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