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RlsLoadBalancerTest.java
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RlsLoadBalancerTest.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.rls;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.truth.Truth.assertThat;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.CALLS_REAL_METHODS;
import static org.mockito.Mockito.inOrder;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import com.google.common.base.Converter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import io.grpc.Attributes;
import io.grpc.CallOptions;
import io.grpc.ChannelLogger;
import io.grpc.ConnectivityState;
import io.grpc.ConnectivityStateInfo;
import io.grpc.EquivalentAddressGroup;
import io.grpc.ForwardingChannelBuilder;
import io.grpc.LoadBalancer.CreateSubchannelArgs;
import io.grpc.LoadBalancer.Helper;
import io.grpc.LoadBalancer.PickResult;
import io.grpc.LoadBalancer.ResolvedAddresses;
import io.grpc.LoadBalancer.Subchannel;
import io.grpc.LoadBalancer.SubchannelPicker;
import io.grpc.LoadBalancer.SubchannelStateListener;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.MethodDescriptor.Marshaller;
import io.grpc.MethodDescriptor.MethodType;
import io.grpc.NameResolver.ConfigOrError;
import io.grpc.Status;
import io.grpc.SynchronizationContext;
import io.grpc.inprocess.InProcessChannelBuilder;
import io.grpc.inprocess.InProcessServerBuilder;
import io.grpc.internal.JsonParser;
import io.grpc.internal.PickSubchannelArgsImpl;
import io.grpc.lookup.v1.RouteLookupServiceGrpc;
import io.grpc.rls.RlsLoadBalancer.CachingRlsLbClientBuilderProvider;
import io.grpc.rls.RlsProtoConverters.RouteLookupResponseConverter;
import io.grpc.rls.RlsProtoData.RouteLookupRequest;
import io.grpc.rls.RlsProtoData.RouteLookupResponse;
import io.grpc.stub.StreamObserver;
import io.grpc.testing.GrpcCleanupRule;
import java.io.IOException;
import java.lang.Thread.UncaughtExceptionHandler;
import java.net.SocketAddress;
import java.util.Collections;
import java.util.Deque;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ScheduledExecutorService;
import javax.annotation.Nonnull;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.AdditionalAnswers;
import org.mockito.ArgumentCaptor;
import org.mockito.Captor;
import org.mockito.InOrder;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.mockito.junit.MockitoJUnit;
import org.mockito.junit.MockitoRule;
@RunWith(JUnit4.class)
public class RlsLoadBalancerTest {
@Rule
public final GrpcCleanupRule grpcCleanupRule = new GrpcCleanupRule();
@Rule
public final MockitoRule mocks = MockitoJUnit.rule();
private final RlsLoadBalancerProvider provider = new RlsLoadBalancerProvider();
private final DoNotUseDirectScheduledExecutorService fakeScheduledExecutorService =
mock(DoNotUseDirectScheduledExecutorService.class, CALLS_REAL_METHODS);
private final SynchronizationContext syncContext =
new SynchronizationContext(new UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread t, Throwable e) {
throw new RuntimeException(e);
}
});
private final Helper helper =
mock(Helper.class, AdditionalAnswers.delegatesTo(new FakeHelper()));
private final FakeRlsServerImpl fakeRlsServerImpl = new FakeRlsServerImpl();
private final Deque<FakeSubchannel> subchannels = new LinkedList<>();
@Mock
private Marshaller<Object> mockMarshaller;
@Captor
private ArgumentCaptor<SubchannelPicker> pickerCaptor;
private MethodDescriptor<Object, Object> fakeSearchMethod;
private MethodDescriptor<Object, Object> fakeRescueMethod;
private RlsLoadBalancer rlsLb;
private boolean existingEnableOobChannelDirectPath;
private String defaultTarget = "defaultTarget";
@Before
public void setUp() throws Exception {
MockitoAnnotations.initMocks(this);
existingEnableOobChannelDirectPath = CachingRlsLbClient.enableOobChannelDirectPath;
CachingRlsLbClient.enableOobChannelDirectPath = false;
fakeSearchMethod =
MethodDescriptor.newBuilder()
.setFullMethodName("com.google/Search")
.setRequestMarshaller(mockMarshaller)
.setResponseMarshaller(mockMarshaller)
.setType(MethodType.CLIENT_STREAMING)
.build();
fakeRescueMethod =
MethodDescriptor.newBuilder()
.setFullMethodName("com.google/Rescue")
.setRequestMarshaller(mockMarshaller)
.setResponseMarshaller(mockMarshaller)
.setType(MethodType.UNARY)
.build();
fakeRlsServerImpl.setLookupTable(
ImmutableMap.of(
new RouteLookupRequest(
"localhost:8972", "/com.google/Search", "grpc", ImmutableMap.<String, String>of()),
new RouteLookupResponse(ImmutableList.of("wilderness"), "where are you?"),
new RouteLookupRequest(
"localhost:8972", "/com.google/Rescue", "grpc", ImmutableMap.<String, String>of()),
new RouteLookupResponse(ImmutableList.of("civilization"), "you are safe")));
rlsLb = (RlsLoadBalancer) provider.newLoadBalancer(helper);
rlsLb.cachingRlsLbClientBuilderProvider = new CachingRlsLbClientBuilderProvider() {
@Override
public CachingRlsLbClient.Builder get() {
// using default throttler which doesn't throttle
return CachingRlsLbClient.newBuilder();
}
};
}
@After
public void tearDown() throws Exception {
rlsLb.shutdown();
CachingRlsLbClient.enableOobChannelDirectPath = existingEnableOobChannelDirectPath;
}
@Test
public void lb_working_withDefaultTarget() throws Exception {
deliverResolvedAddresses();
InOrder inOrder = inOrder(helper);
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.CONNECTING), pickerCaptor.capture());
SubchannelPicker picker = pickerCaptor.getValue();
Metadata headers = new Metadata();
PickResult res = picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeSearchMethod, headers, CallOptions.DEFAULT));
inOrder.verify(helper).createSubchannel(any(CreateSubchannelArgs.class));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.CONNECTING), any(SubchannelPicker.class));
inOrder.verifyNoMoreInteractions();
assertThat(res.getStatus().isOk()).isTrue();
assertThat(subchannelIsReady(res.getSubchannel())).isFalse();
assertThat(subchannels).hasSize(1);
FakeSubchannel searchSubchannel = subchannels.getLast();
searchSubchannel.updateState(ConnectivityStateInfo.forNonError(ConnectivityState.READY));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.READY), pickerCaptor.capture());
inOrder.verifyNoMoreInteractions();
assertThat(subchannelIsReady(res.getSubchannel())).isTrue();
assertThat(res.getSubchannel().getAddresses()).isEqualTo(searchSubchannel.getAddresses());
assertThat(res.getSubchannel().getAttributes()).isEqualTo(searchSubchannel.getAttributes());
// rescue should be pending status although the overall channel state is READY
res = picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeRescueMethod, headers, CallOptions.DEFAULT));
inOrder.verify(helper).createSubchannel(any(CreateSubchannelArgs.class));
// other rls picker itself is ready due to first channel.
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.READY), pickerCaptor.capture());
inOrder.verifyNoMoreInteractions();
assertThat(res.getStatus().isOk()).isTrue();
assertThat(subchannelIsReady(res.getSubchannel())).isFalse();
assertThat(subchannels).hasSize(2);
FakeSubchannel rescueSubchannel = subchannels.getLast();
// search subchannel is down, rescue subchannel is connecting
searchSubchannel.updateState(ConnectivityStateInfo.forTransientFailure(Status.NOT_FOUND));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.CONNECTING), pickerCaptor.capture());
rescueSubchannel.updateState(ConnectivityStateInfo.forNonError(ConnectivityState.READY));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.READY), pickerCaptor.capture());
// search again, use pending fallback because searchSubchannel is in failure mode
res = picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeSearchMethod, headers, CallOptions.DEFAULT));
assertThat(res.getStatus().isOk()).isTrue();
assertThat(subchannelIsReady(res.getSubchannel())).isFalse();
inOrder.verify(helper).createSubchannel(any(CreateSubchannelArgs.class));
assertThat(subchannels).hasSize(3);
FakeSubchannel fallbackSubchannel = subchannels.getLast();
fallbackSubchannel.updateState(ConnectivityStateInfo.forNonError(ConnectivityState.READY));
inOrder.verify(helper, times(2))
.updateBalancingState(eq(ConnectivityState.READY), pickerCaptor.capture());
inOrder.verifyNoMoreInteractions();
res = picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeSearchMethod, headers, CallOptions.DEFAULT));
assertThat(subchannelIsReady(res.getSubchannel())).isTrue();
assertThat(res.getSubchannel().getAddresses()).isEqualTo(searchSubchannel.getAddresses());
assertThat(res.getSubchannel().getAttributes()).isEqualTo(searchSubchannel.getAttributes());
res = picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeRescueMethod, headers, CallOptions.DEFAULT));
assertThat(subchannelIsReady(res.getSubchannel())).isTrue();
assertThat(res.getSubchannel().getAddresses()).isEqualTo(rescueSubchannel.getAddresses());
assertThat(res.getSubchannel().getAttributes()).isEqualTo(rescueSubchannel.getAttributes());
// all channels are failed
rescueSubchannel.updateState(ConnectivityStateInfo.forTransientFailure(Status.NOT_FOUND));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.READY), pickerCaptor.capture());
fallbackSubchannel.updateState(ConnectivityStateInfo.forTransientFailure(Status.NOT_FOUND));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.TRANSIENT_FAILURE), pickerCaptor.capture());
inOrder.verifyNoMoreInteractions();
}
@Test
public void lb_working_withoutDefaultTarget() throws Exception {
defaultTarget = "";
deliverResolvedAddresses();
InOrder inOrder = inOrder(helper);
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.CONNECTING), pickerCaptor.capture());
SubchannelPicker picker = pickerCaptor.getValue();
Metadata headers = new Metadata();
PickResult res = picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeSearchMethod, headers, CallOptions.DEFAULT));
inOrder.verify(helper).createSubchannel(any(CreateSubchannelArgs.class));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.CONNECTING), any(SubchannelPicker.class));
inOrder.verifyNoMoreInteractions();
assertThat(res.getStatus().isOk()).isTrue();
assertThat(subchannels).hasSize(1);
FakeSubchannel searchSubchannel = subchannels.getLast();
searchSubchannel.updateState(ConnectivityStateInfo.forNonError(ConnectivityState.READY));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.READY), pickerCaptor.capture());
inOrder.verifyNoMoreInteractions();
assertThat(subchannelIsReady(res.getSubchannel())).isTrue();
assertThat(res.getSubchannel().getAddresses()).isEqualTo(searchSubchannel.getAddresses());
assertThat(res.getSubchannel().getAttributes()).isEqualTo(searchSubchannel.getAttributes());
// rescue should be pending status although the overall channel state is READY
picker = pickerCaptor.getValue();
res = picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeRescueMethod, headers, CallOptions.DEFAULT));
inOrder.verify(helper).createSubchannel(any(CreateSubchannelArgs.class));
// other rls picker itself is ready due to first channel.
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.READY), pickerCaptor.capture());
inOrder.verifyNoMoreInteractions();
assertThat(res.getStatus().isOk()).isTrue();
assertThat(subchannelIsReady(res.getSubchannel())).isFalse();
assertThat(subchannels).hasSize(2);
FakeSubchannel rescueSubchannel = subchannels.getLast();
// search subchannel is down, rescue subchannel is still connecting
searchSubchannel.updateState(ConnectivityStateInfo.forTransientFailure(Status.NOT_FOUND));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.CONNECTING), pickerCaptor.capture());
rescueSubchannel.updateState(ConnectivityStateInfo.forNonError(ConnectivityState.READY));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.READY), pickerCaptor.capture());
// search method will fail because there is no fallback target.
picker = pickerCaptor.getValue();
res = picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeSearchMethod, headers, CallOptions.DEFAULT));
assertThat(res.getStatus().isOk()).isFalse();
assertThat(subchannelIsReady(res.getSubchannel())).isFalse();
res = picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeRescueMethod, headers, CallOptions.DEFAULT));
assertThat(subchannelIsReady(res.getSubchannel())).isTrue();
assertThat(res.getSubchannel().getAddresses()).isEqualTo(rescueSubchannel.getAddresses());
assertThat(res.getSubchannel().getAttributes()).isEqualTo(rescueSubchannel.getAttributes());
// all channels are failed
rescueSubchannel.updateState(ConnectivityStateInfo.forTransientFailure(Status.NOT_FOUND));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.TRANSIENT_FAILURE), pickerCaptor.capture());
inOrder.verifyNoMoreInteractions();
}
@Test
public void lb_nameResolutionFailed() throws Exception {
deliverResolvedAddresses();
InOrder inOrder = inOrder(helper);
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.CONNECTING), pickerCaptor.capture());
SubchannelPicker picker = pickerCaptor.getValue();
Metadata headers = new Metadata();
PickResult res =
picker.pickSubchannel(
new PickSubchannelArgsImpl(fakeSearchMethod, headers, CallOptions.DEFAULT));
assertThat(res.getStatus().isOk()).isTrue();
assertThat(subchannelIsReady(res.getSubchannel())).isFalse();
inOrder.verify(helper).createSubchannel(any(CreateSubchannelArgs.class));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.CONNECTING), pickerCaptor.capture());
assertThat(subchannels).hasSize(1);
inOrder.verifyNoMoreInteractions();
FakeSubchannel searchSubchannel = subchannels.getLast();
searchSubchannel.updateState(ConnectivityStateInfo.forNonError(ConnectivityState.READY));
inOrder.verify(helper)
.updateBalancingState(eq(ConnectivityState.READY), pickerCaptor.capture());
SubchannelPicker picker2 = pickerCaptor.getValue();
assertThat(picker2).isEqualTo(picker);
res = picker2.pickSubchannel(
new PickSubchannelArgsImpl(fakeSearchMethod, headers, CallOptions.DEFAULT));
// verify success. Subchannel is wrapped, so checking attributes.
assertThat(subchannelIsReady(res.getSubchannel())).isTrue();
assertThat(res.getSubchannel().getAddresses()).isEqualTo(searchSubchannel.getAddresses());
assertThat(res.getSubchannel().getAttributes()).isEqualTo(searchSubchannel.getAttributes());
inOrder.verifyNoMoreInteractions();
rlsLb.handleNameResolutionError(Status.UNAVAILABLE);
verify(helper)
.updateBalancingState(eq(ConnectivityState.TRANSIENT_FAILURE), pickerCaptor.capture());
SubchannelPicker failedPicker = pickerCaptor.getValue();
res = failedPicker.pickSubchannel(
new PickSubchannelArgsImpl(fakeSearchMethod, headers, CallOptions.DEFAULT));
assertThat(res.getStatus().isOk()).isFalse();
assertThat(subchannelIsReady(res.getSubchannel())).isFalse();
}
private void deliverResolvedAddresses() throws Exception {
ConfigOrError parsedConfigOrError =
provider.parseLoadBalancingPolicyConfig(getServiceConfig());
assertThat(parsedConfigOrError.getConfig()).isNotNull();
rlsLb.handleResolvedAddresses(ResolvedAddresses.newBuilder()
.setAddresses(ImmutableList.of(new EquivalentAddressGroup(mock(SocketAddress.class))))
.setLoadBalancingPolicyConfig(parsedConfigOrError.getConfig())
.build());
verify(helper).createResolvingOobChannelBuilder(anyString());
}
@SuppressWarnings("unchecked")
private Map<String, Object> getServiceConfig() throws IOException {
String serviceConfig = "{"
+ " \"routeLookupConfig\": " + getRlsConfigJsonStr() + ", "
+ " \"childPolicy\": [{\"pick_first\": {}}],"
+ " \"childPolicyConfigTargetFieldName\": \"serviceName\""
+ "}";
return (Map<String, Object>) JsonParser.parse(serviceConfig);
}
private String getRlsConfigJsonStr() {
return "{\n"
+ " \"grpcKeyBuilders\": [\n"
+ " {\n"
+ " \"names\": [\n"
+ " {\n"
+ " \"service\": \"com.google\",\n"
+ " \"method\": \"*\"\n"
+ " }\n"
+ " ],\n"
+ " \"headers\": [\n"
+ " {\n"
+ " \"key\": \"permit\","
+ " \"names\": [\"PermitId\"],\n"
+ " \"optional\": true\n"
+ " }\n"
+ " ]\n"
+ " }\n"
+ " ],\n"
+ " \"lookupService\": \"localhost:8972\",\n"
+ " \"lookupServiceTimeout\": 2,\n"
+ " \"maxAge\": 300,\n"
+ " \"staleAge\": 240,\n"
+ " \"validTargets\": [\"localhost:9001\", \"localhost:9002\"],"
+ " \"cacheSizeBytes\": 1000,\n"
+ " \"defaultTarget\": \"" + defaultTarget + "\",\n"
+ " \"requestProcessingStrategy\": \"SYNC_LOOKUP_DEFAULT_TARGET_ON_ERROR\"\n"
+ "}";
}
private final class FakeHelper extends Helper {
@Override
public Subchannel createSubchannel(CreateSubchannelArgs args) {
FakeSubchannel subchannel = new FakeSubchannel(args.getAddresses(), args.getAttributes());
subchannels.add(subchannel);
return subchannel;
}
@Override
public ManagedChannelBuilder<?> createResolvingOobChannelBuilder(String target) {
try {
grpcCleanupRule.register(
InProcessServerBuilder.forName(target)
.addService(fakeRlsServerImpl)
.directExecutor()
.build()
.start());
} catch (IOException e) {
throw new RuntimeException("cannot create server: " + target, e);
}
final InProcessChannelBuilder builder =
InProcessChannelBuilder.forName(target).directExecutor();
class CleaningChannelBuilder extends ForwardingChannelBuilder<CleaningChannelBuilder> {
@Override
protected ManagedChannelBuilder<?> delegate() {
return builder;
}
@Override
public ManagedChannel build() {
return grpcCleanupRule.register(super.build());
}
}
return new CleaningChannelBuilder();
}
@Override
public ManagedChannel createOobChannel(EquivalentAddressGroup eag, String authority) {
throw new UnsupportedOperationException();
}
@Override
public void updateBalancingState(
@Nonnull ConnectivityState newState, @Nonnull SubchannelPicker newPicker) {
// no-op
}
@Override
public String getAuthority() {
return "fake-bigtable.googleapis.com";
}
@Override
public ScheduledExecutorService getScheduledExecutorService() {
return fakeScheduledExecutorService;
}
@Override
public SynchronizationContext getSynchronizationContext() {
return syncContext;
}
@Override
public ChannelLogger getChannelLogger() {
return mock(ChannelLogger.class);
}
}
private static final class FakeRlsServerImpl
extends RouteLookupServiceGrpc.RouteLookupServiceImplBase {
private static final Converter<io.grpc.lookup.v1.RouteLookupRequest, RouteLookupRequest>
REQUEST_CONVERTER = new RlsProtoConverters.RouteLookupRequestConverter();
private static final Converter<RouteLookupResponse, io.grpc.lookup.v1.RouteLookupResponse>
RESPONSE_CONVERTER = new RouteLookupResponseConverter().reverse();
private Map<RouteLookupRequest, RouteLookupResponse> lookupTable = ImmutableMap.of();
private void setLookupTable(Map<RouteLookupRequest, RouteLookupResponse> lookupTable) {
this.lookupTable = checkNotNull(lookupTable, "lookupTable");
}
@Override
public void routeLookup(io.grpc.lookup.v1.RouteLookupRequest request,
StreamObserver<io.grpc.lookup.v1.RouteLookupResponse> responseObserver) {
RouteLookupResponse response =
lookupTable.get(REQUEST_CONVERTER.convert(request));
if (response == null) {
responseObserver.onError(new RuntimeException("not found"));
} else {
responseObserver.onNext(RESPONSE_CONVERTER.convert(response));
responseObserver.onCompleted();
}
}
}
private static final class FakeSubchannel extends Subchannel {
private final Attributes attributes;
private List<EquivalentAddressGroup> eags;
private SubchannelStateListener listener;
private boolean isReady;
public FakeSubchannel(List<EquivalentAddressGroup> eags, Attributes attributes) {
this.eags = Collections.unmodifiableList(eags);
this.attributes = attributes;
}
@Override
public List<EquivalentAddressGroup> getAllAddresses() {
return eags;
}
@Override
public Attributes getAttributes() {
return attributes;
}
@Override
public void start(SubchannelStateListener listener) {
this.listener = checkNotNull(listener, "listener");
}
@Override
public void updateAddresses(List<EquivalentAddressGroup> addrs) {
this.eags = Collections.unmodifiableList(addrs);
}
@Override
public void shutdown() {
}
@Override
public void requestConnection() {
}
public void updateState(ConnectivityStateInfo newState) {
listener.onSubchannelState(newState);
isReady = newState.getState().equals(ConnectivityState.READY);
}
}
private static boolean subchannelIsReady(Subchannel subchannel) {
return subchannel instanceof FakeSubchannel && ((FakeSubchannel) subchannel).isReady;
}
}