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ServiceConfigErrorHandlingTest.java
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ServiceConfigErrorHandlingTest.java
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/*
* Copyright 2019 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.base.Preconditions.checkState;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.mockito.AdditionalAnswers.delegatesTo;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import io.grpc.Attributes;
import io.grpc.ClientInterceptor;
import io.grpc.ConnectivityState;
import io.grpc.EquivalentAddressGroup;
import io.grpc.InternalChannelz;
import io.grpc.LoadBalancer;
import io.grpc.LoadBalancer.Helper;
import io.grpc.LoadBalancer.ResolvedAddresses;
import io.grpc.LoadBalancerProvider;
import io.grpc.LoadBalancerRegistry;
import io.grpc.NameResolver;
import io.grpc.Status;
import java.net.SocketAddress;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import javax.annotation.Nullable;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
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;
/** Unit tests for ServiceConfig error handling. */
@RunWith(JUnit4.class)
public class ServiceConfigErrorHandlingTest {
private static final int DEFAULT_PORT = 447;
private static final long RECONNECT_BACKOFF_INTERVAL_NANOS = 10;
private static final String SERVICE_NAME = "fake.example.com";
private static final String USER_AGENT = "userAgent";
private static final String TARGET = "fake://" + SERVICE_NAME;
private static final String MOCK_POLICY_NAME = "mock_lb";
private URI expectedUri;
private final SocketAddress socketAddress =
new SocketAddress() {
@Override
public String toString() {
return "test-addr";
}
};
private final EquivalentAddressGroup addressGroup = new EquivalentAddressGroup(socketAddress);
private final FakeClock timer = new FakeClock();
private final FakeClock executor = new FakeClock();
private static final FakeClock.TaskFilter NAME_RESOLVER_REFRESH_TASK_FILTER =
new FakeClock.TaskFilter() {
@Override
public boolean shouldAccept(Runnable command) {
return command.toString().contains(
ManagedChannelImpl.DelayedNameResolverRefresh.class.getName());
}
};
private final InternalChannelz channelz = new InternalChannelz();
@Rule public final ExpectedException thrown = ExpectedException.none();
@Rule public final MockitoRule mocks = MockitoJUnit.rule();
private ManagedChannelImpl channel;
private FakeLoadBalancer mockLoadBalancer =
mock(FakeLoadBalancer.class, delegatesTo(new FakeLoadBalancer()));
private final LoadBalancerProvider mockLoadBalancerProvider =
mock(LoadBalancerProvider.class, delegatesTo(new LoadBalancerProvider() {
@Override
public LoadBalancer newLoadBalancer(final Helper helper) {
mockLoadBalancer.setHelper(helper);
return mockLoadBalancer;
}
@Override
public boolean isAvailable() {
return true;
}
@Override
public int getPriority() {
return 999;
}
@Override
public String getPolicyName() {
return MOCK_POLICY_NAME;
}
}));
@Mock
private ClientTransportFactory mockTransportFactory;
@Mock
private ObjectPool<Executor> executorPool;
@Mock
private ObjectPool<Executor> balancerRpcExecutorPool;
@Mock
private Executor blockingExecutor;
private ChannelBuilder channelBuilder;
private void createChannel(ClientInterceptor... interceptors) {
checkState(channel == null);
channel =
new ManagedChannelImpl(
channelBuilder,
mockTransportFactory,
new FakeBackoffPolicyProvider(),
balancerRpcExecutorPool,
timer.getStopwatchSupplier(),
Arrays.asList(interceptors),
timer.getTimeProvider());
int numExpectedTasks = 0;
// Force-exit the initial idle-mode
channel.syncContext.execute(new Runnable() {
@Override
public void run() {
channel.exitIdleMode();
}
});
if (channelBuilder.idleTimeoutMillis != ManagedChannelImpl.IDLE_TIMEOUT_MILLIS_DISABLE) {
numExpectedTasks += 1;
}
if (getNameResolverRefresh() != null) {
numExpectedTasks += 1;
}
assertEquals(numExpectedTasks, timer.numPendingTasks());
ArgumentCaptor<Helper> helperCaptor = ArgumentCaptor.forClass(null);
verify(mockLoadBalancerProvider).newLoadBalancer(helperCaptor.capture());
}
@Before
public void setUp() throws Exception {
when(mockLoadBalancer.canHandleEmptyAddressListFromNameResolution()).thenCallRealMethod();
LoadBalancerRegistry.getDefaultRegistry().register(mockLoadBalancerProvider);
expectedUri = new URI(TARGET);
when(mockTransportFactory.getScheduledExecutorService())
.thenReturn(timer.getScheduledExecutorService());
when(executorPool.getObject()).thenReturn(executor.getScheduledExecutorService());
channelBuilder =
new ChannelBuilder()
.nameResolverFactory(new FakeNameResolverFactory.Builder(expectedUri).build())
.defaultLoadBalancingPolicy(MOCK_POLICY_NAME)
.userAgent(USER_AGENT)
.idleTimeout(
AbstractManagedChannelImplBuilder.IDLE_MODE_MAX_TIMEOUT_DAYS, TimeUnit.DAYS)
.offloadExecutor(blockingExecutor);
channelBuilder.executorPool = executorPool;
channelBuilder.binlog = null;
channelBuilder.channelz = channelz;
}
@After
public void allPendingTasksAreRun() throws Exception {
// The "never" verifications in the tests only hold up if all due tasks are done.
// As for timer, although there may be scheduled tasks in a future time, since we don't test
// any time-related behavior in this test suite, we only care the tasks that are due. This
// would ignore any time-sensitive tasks, e.g., back-off and the idle timer.
assertTrue(timer.getDueTasks() + " should be empty", timer.getDueTasks().isEmpty());
assertEquals(executor.getPendingTasks() + " should be empty", 0, executor.numPendingTasks());
if (channel != null) {
channel.shutdownNow();
channel = null;
}
}
@After
public void cleanUp() {
LoadBalancerRegistry.getDefaultRegistry().deregister(mockLoadBalancerProvider);
}
@Test
public void emptyAddressesWithValidConfig_lbNeedsAddress() throws Exception {
FakeNameResolverFactory nameResolverFactory =
new FakeNameResolverFactory.Builder(expectedUri)
.setServers(Collections.<EquivalentAddressGroup>emptyList())
.build();
channelBuilder.nameResolverFactory(nameResolverFactory);
Attributes serviceConfigAttrs =
Attributes.newBuilder()
.set(
GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG,
ImmutableMap.<String, Object>of("loadBalancingPolicy", "round_robin"))
.build();
nameResolverFactory.nextResolvedAttributes.set(serviceConfigAttrs);
createChannel();
assertThat(channel.getState(true)).isEqualTo(ConnectivityState.TRANSIENT_FAILURE);
}
@Test
public void emptyAddressesWithValidConfig_lbDoesNotNeedAddress() throws Exception {
FakeNameResolverFactory nameResolverFactory =
new FakeNameResolverFactory.Builder(expectedUri)
.setServers(Collections.<EquivalentAddressGroup>emptyList())
.build();
channelBuilder.nameResolverFactory(nameResolverFactory);
when(mockLoadBalancer.canHandleEmptyAddressListFromNameResolution()).thenReturn(true);
ImmutableMap<String, Object> serviceConfig =
ImmutableMap.<String, Object>of("loadBalancingPolicy", "mock_lb");
Attributes serviceConfigAttrs =
Attributes.newBuilder()
.set(
GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG,
serviceConfig)
.build();
nameResolverFactory.nextResolvedAttributes.set(serviceConfigAttrs);
createChannel();
ArgumentCaptor<ResolvedAddresses> resultCaptor =
ArgumentCaptor.forClass(ResolvedAddresses.class);
verify(mockLoadBalancer).handleResolvedAddresses(resultCaptor.capture());
assertThat(resultCaptor.getValue().getAddresses()).isEmpty();
Attributes actualAttrs = resultCaptor.getValue().getAttributes();
assertThat(actualAttrs.get(GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG))
.isEqualTo(serviceConfig);
verify(mockLoadBalancer, never()).handleNameResolutionError(any(Status.class));
assertThat(channel.getState(false)).isNotEqualTo(ConnectivityState.TRANSIENT_FAILURE);
}
@Test
public void validConfig_lbDoesNotNeedAddress() throws Exception {
FakeNameResolverFactory nameResolverFactory =
new FakeNameResolverFactory.Builder(expectedUri)
.setServers(ImmutableList.of(addressGroup))
.build();
channelBuilder.nameResolverFactory(nameResolverFactory);
ImmutableMap<String, Object> serviceConfig =
ImmutableMap.<String, Object>of("loadBalancingPolicy", "mock_lb");
Attributes serviceConfigAttrs =
Attributes.newBuilder()
.set(
GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG,
serviceConfig)
.build();
nameResolverFactory.nextResolvedAttributes.set(serviceConfigAttrs);
createChannel();
ArgumentCaptor<ResolvedAddresses> resultCaptor =
ArgumentCaptor.forClass(ResolvedAddresses.class);
verify(mockLoadBalancer).handleResolvedAddresses(resultCaptor.capture());
assertThat(resultCaptor.getValue().getAddresses()).containsExactly(addressGroup);
Attributes actualAttrs = resultCaptor.getValue().getAttributes();
assertThat(actualAttrs.get(GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG))
.isEqualTo(serviceConfig);
verify(mockLoadBalancer, never()).handleNameResolutionError(any(Status.class));
assertThat(channel.getState(false)).isNotEqualTo(ConnectivityState.TRANSIENT_FAILURE);
}
@Test
public void invalidConfig_noDefaultConfig() throws Exception {
Status error = Status.NOT_FOUND.withDescription("service config error");
FakeNameResolverFactory nameResolverFactory =
new FakeNameResolverFactory.Builder(expectedUri)
.setServers(ImmutableList.of(addressGroup))
.setError(error)
.build();
channelBuilder.nameResolverFactory(nameResolverFactory);
createChannel();
ArgumentCaptor<Status> statusCaptor =
ArgumentCaptor.forClass(Status.class);
verify(mockLoadBalancer).handleNameResolutionError(statusCaptor.capture());
assertThat(statusCaptor.getValue()).isEqualTo(error);
assertThat(channel.getState(true)).isEqualTo(ConnectivityState.TRANSIENT_FAILURE);
}
@Test
public void resolverReturnsNoConfig_noDefaultConfig() {
FakeNameResolverFactory nameResolverFactory =
new FakeNameResolverFactory.Builder(expectedUri)
.setServers(ImmutableList.of(addressGroup))
.build();
channelBuilder.nameResolverFactory(nameResolverFactory);
nameResolverFactory.nextResolvedAttributes.set(Attributes.EMPTY);
createChannel();
ArgumentCaptor<ResolvedAddresses> resultCaptor =
ArgumentCaptor.forClass(ResolvedAddresses.class);
verify(mockLoadBalancer).handleResolvedAddresses(resultCaptor.capture());
assertThat(resultCaptor.getValue().getAddresses()).containsExactly(addressGroup);
Attributes actualAttrs = resultCaptor.getValue().getAttributes();
assertThat(actualAttrs.get(GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG)).isEmpty();
verify(mockLoadBalancer, never()).handleNameResolutionError(any(Status.class));
assertThat(channel.getState(false)).isNotEqualTo(ConnectivityState.TRANSIENT_FAILURE);
}
@Test
public void resolverReturnsNoConfig_usingDefaultConfig() throws Exception {
FakeNameResolverFactory nameResolverFactory =
new FakeNameResolverFactory.Builder(expectedUri)
.setServers(ImmutableList.of(addressGroup))
.build();
channelBuilder.nameResolverFactory(nameResolverFactory);
ImmutableMap<String, Object> defaultServiceConfig =
ImmutableMap.<String, Object>of("loadBalancingPolicy", "mock_lb");
channelBuilder.defaultServiceConfig(defaultServiceConfig);
Attributes serviceConfigAttrs = Attributes.EMPTY;
nameResolverFactory.nextResolvedAttributes.set(serviceConfigAttrs);
createChannel();
ArgumentCaptor<ResolvedAddresses> resultCaptor =
ArgumentCaptor.forClass(ResolvedAddresses.class);
verify(mockLoadBalancer).handleResolvedAddresses(resultCaptor.capture());
assertThat(resultCaptor.getValue().getAddresses()).containsExactly(addressGroup);
Attributes actualAttrs = resultCaptor.getValue().getAttributes();
assertThat(actualAttrs.get(GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG))
.isEqualTo(defaultServiceConfig);
verify(mockLoadBalancer, never()).handleNameResolutionError(any(Status.class));
assertThat(channel.getState(false)).isNotEqualTo(ConnectivityState.TRANSIENT_FAILURE);
}
@Test
public void resolverReturnsInvalidConfig_firstResolutionWithDefaultConfig() throws Exception {
FakeNameResolverFactory nameResolverFactory =
new FakeNameResolverFactory.Builder(expectedUri)
.setServers(ImmutableList.of(addressGroup))
.build();
channelBuilder.nameResolverFactory(nameResolverFactory);
ImmutableMap<String, Object> defaultServiceConfig =
ImmutableMap.<String, Object>of("loadBalancingPolicy", "mock_lb");
channelBuilder.defaultServiceConfig(defaultServiceConfig);
Attributes serviceConfigAttrs =
Attributes.newBuilder()
.set(
GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG,
ImmutableMap.<String, Object>of("loadBalancingPolicy", "kaboom"))
.build();
nameResolverFactory.nextResolvedAttributes.set(serviceConfigAttrs);
createChannel();
assertThat(channel.getState(false)).isEqualTo(ConnectivityState.TRANSIENT_FAILURE);
}
@Test
public void resolverReturnsInvalidConfig_firstResolutionWithoutDefaultConfig() throws Exception {
FakeNameResolverFactory nameResolverFactory =
new FakeNameResolverFactory.Builder(expectedUri)
.setServers(ImmutableList.of(addressGroup))
.build();
channelBuilder.nameResolverFactory(nameResolverFactory);
Attributes serviceConfigAttrs =
Attributes.newBuilder()
.set(
GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG,
ImmutableMap.<String, Object>of("loadBalancingPolicy", "kaboom"))
.build();
nameResolverFactory.nextResolvedAttributes.set(serviceConfigAttrs);
createChannel();
assertThat(channel.getState(false)).isEqualTo(ConnectivityState.TRANSIENT_FAILURE);
}
private static final class ChannelBuilder
extends AbstractManagedChannelImplBuilder<ChannelBuilder> {
ChannelBuilder() {
super(TARGET);
}
@Override protected ClientTransportFactory buildTransportFactory() {
throw new UnsupportedOperationException();
}
@Override protected int getDefaultPort() {
return DEFAULT_PORT;
}
}
private static final class FakeBackoffPolicyProvider implements BackoffPolicy.Provider {
@Override
public BackoffPolicy get() {
return new BackoffPolicy() {
int multiplier = 1;
@Override
public long nextBackoffNanos() {
return RECONNECT_BACKOFF_INTERVAL_NANOS * multiplier++;
}
};
}
}
private static final class FakeNameResolverFactory extends NameResolver.Factory {
final URI expectedUri;
final List<EquivalentAddressGroup> servers;
final boolean resolvedAtStart;
final Status error;
final ArrayList<FakeNameResolver> resolvers = new ArrayList<>();
// The Attributes argument of the next invocation of listener.onAddresses(servers, attrs)
final AtomicReference<Attributes> nextResolvedAttributes =
new AtomicReference<>(Attributes.EMPTY);
FakeNameResolverFactory(
URI expectedUri,
List<EquivalentAddressGroup> servers,
boolean resolvedAtStart,
Status error) {
this.expectedUri = expectedUri;
this.servers = servers;
this.resolvedAtStart = resolvedAtStart;
this.error = error;
}
@Override
public NameResolver newNameResolver(final URI targetUri, NameResolver.Args args) {
if (!expectedUri.equals(targetUri)) {
return null;
}
assertEquals(DEFAULT_PORT, args.getDefaultPort());
FakeNameResolver resolver = new FakeNameResolver(error);
resolvers.add(resolver);
return resolver;
}
@Override
public String getDefaultScheme() {
return "fake";
}
void allResolved() {
for (FakeNameResolver resolver : resolvers) {
resolver.resolved();
}
}
final class FakeNameResolver extends NameResolver {
Listener2 listener;
boolean shutdown;
int refreshCalled;
Status error;
FakeNameResolver(Status error) {
this.error = error;
}
@Override public String getServiceAuthority() {
return expectedUri.getAuthority();
}
@Override public void start(Listener2 listener) {
this.listener = listener;
if (resolvedAtStart) {
resolved();
}
}
@Override public void refresh() {
refreshCalled++;
resolved();
}
void resolved() {
if (error != null) {
listener.onError(error);
return;
}
Attributes attr = nextResolvedAttributes.get();
Map<String, ?> config = attr.get(GrpcAttributes.NAME_RESOLVER_SERVICE_CONFIG);
ResolutionResult.Builder builder =
ResolutionResult.newBuilder()
.setAddresses(servers)
.setAttributes(attr);
if (config != null) {
builder.setServiceConfig(ConfigOrError.fromConfig(config));
}
listener.onResult(builder.build());
}
@Override public void shutdown() {
shutdown = true;
}
@Override
public String toString() {
return "FakeNameResolver";
}
}
static final class Builder {
final URI expectedUri;
List<EquivalentAddressGroup> servers = ImmutableList.of();
boolean resolvedAtStart = true;
Status error = null;
Builder(URI expectedUri) {
this.expectedUri = expectedUri;
}
Builder setServers(List<EquivalentAddressGroup> servers) {
this.servers = servers;
return this;
}
Builder setResolvedAtStart(boolean resolvedAtStart) {
this.resolvedAtStart = resolvedAtStart;
return this;
}
Builder setError(Status error) {
this.error = error;
return this;
}
FakeNameResolverFactory build() {
return new FakeNameResolverFactory(expectedUri, servers, resolvedAtStart, error);
}
}
}
private FakeClock.ScheduledTask getNameResolverRefresh() {
return Iterables.getOnlyElement(timer.getPendingTasks(NAME_RESOLVER_REFRESH_TASK_FILTER), null);
}
private static class FakeLoadBalancer extends LoadBalancer {
@Nullable
private Helper helper;
public void setHelper(Helper helper) {
this.helper = helper;
}
@Override
public void handleNameResolutionError(final Status error) {
helper.updateBalancingState(ConnectivityState.TRANSIENT_FAILURE,
new SubchannelPicker() {
@Override
public PickResult pickSubchannel(PickSubchannelArgs args) {
return PickResult.withError(error);
}
});
}
@Override
public void shutdown() {}
}
}