/
ConfigSelectingClientCallTest.java
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/
ConfigSelectingClientCallTest.java
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/*
* Copyright 2020 The gRPC Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.grpc.internal;
import static com.google.common.truth.Truth.assertThat;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.verify;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.util.concurrent.MoreExecutors;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.InternalConfigSelector;
import io.grpc.LoadBalancer.PickSubchannelArgs;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.Status;
import io.grpc.internal.ManagedChannelImpl.ConfigSelectingClientCall;
import io.grpc.internal.ManagedChannelServiceConfig.MethodInfo;
import io.grpc.testing.TestMethodDescriptors;
import java.util.Map;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnit;
import org.mockito.junit.MockitoRule;
/** Tests for {@link ManagedChannelImpl.ConfigSelectingClientCall}. */
@RunWith(JUnit4.class)
public class ConfigSelectingClientCallTest {
@Rule
public MockitoRule mockitoRule = MockitoJUnit.rule();
private final MethodDescriptor<Void, Void> method = TestMethodDescriptors.voidMethod();
private TestChannel channel = new TestChannel();
// The underlying call directly created by the channel.
private TestCall<?, ?> call;
@Mock
private ClientCall.Listener<Void> callListener;
@Test
public void configSelectorInterceptsCall() {
Map<String, ?> rawMethodConfig = ImmutableMap.of(
"retryPolicy",
ImmutableMap.of(
"maxAttempts", 3.0D,
"initialBackoff", "1s",
"maxBackoff", "10s",
"backoffMultiplier", 1.5D,
"retryableStatusCodes", ImmutableList.of("UNAVAILABLE")
));
final MethodInfo methodInfo = new MethodInfo(rawMethodConfig, true, 4, 4);
final Metadata.Key<String> metadataKey =
Metadata.Key.of("test", Metadata.ASCII_STRING_MARSHALLER);
final CallOptions.Key<String> callOptionsKey = CallOptions.Key.create("test");
InternalConfigSelector configSelector = new InternalConfigSelector() {
@Override
public Result selectConfig(final PickSubchannelArgs args) {
ManagedChannelServiceConfig config = new ManagedChannelServiceConfig(
methodInfo,
ImmutableMap.<String, MethodInfo>of(),
ImmutableMap.<String, MethodInfo>of(),
null,
null,
null);
return Result.newBuilder()
.setConfig(config)
.setInterceptor(
// An interceptor that mutates CallOptions based on headers value.
new ClientInterceptor() {
String value = args.getHeaders().get(metadataKey);
@Override
public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
MethodDescriptor<ReqT, RespT> method, CallOptions callOptions, Channel next) {
callOptions = callOptions.withOption(callOptionsKey, value);
return next.newCall(method, callOptions);
}
})
.build();
}
};
ClientCall<Void, Void> configSelectingClientCall = new ConfigSelectingClientCall<>(
configSelector,
channel,
MoreExecutors.directExecutor(),
method,
CallOptions.DEFAULT.withAuthority("bar.authority"));
Metadata metadata = new Metadata();
metadata.put(metadataKey, "fooValue");
configSelectingClientCall.start(callListener, metadata);
assertThat(call.callOptions.getAuthority()).isEqualTo("bar.authority");
assertThat(call.callOptions.getOption(MethodInfo.KEY)).isEqualTo(methodInfo);
assertThat(call.callOptions.getOption(callOptionsKey)).isEqualTo("fooValue");
}
@Test
public void selectionErrorPropagatedToListener() {
InternalConfigSelector configSelector = new InternalConfigSelector() {
@Override
public Result selectConfig(PickSubchannelArgs args) {
return Result.forError(Status.FAILED_PRECONDITION);
}
};
ClientCall<Void, Void> configSelectingClientCall = new ConfigSelectingClientCall<>(
configSelector,
channel,
MoreExecutors.directExecutor(),
method,
CallOptions.DEFAULT);
configSelectingClientCall.start(callListener, new Metadata());
ArgumentCaptor<Status> statusCaptor = ArgumentCaptor.forClass(null);
verify(callListener).onClose(statusCaptor.capture(), any(Metadata.class));
assertThat(statusCaptor.getValue().getCode()).isEqualTo(Status.Code.FAILED_PRECONDITION);
// The call should not delegate to null and fail methods with NPE.
configSelectingClientCall.request(1);
}
private final class TestChannel extends Channel {
@Override
public <ReqT, RespT> ClientCall<ReqT, RespT> newCall(
MethodDescriptor<ReqT, RespT> methodDescriptor, CallOptions callOptions) {
TestCall<ReqT, RespT> clientCall = new TestCall<>(callOptions);
call = clientCall;
return clientCall;
}
@Override
public String authority() {
return "foo.authority";
}
}
private static final class TestCall<ReqT, RespT> extends NoopClientCall<ReqT, RespT> {
// CallOptions actually received from the channel when the call is created.
final CallOptions callOptions;
TestCall(CallOptions callOptions) {
this.callOptions = callOptions;
}
}
}