forked from grpc/grpc-java
/
LoadReportClientTest.java
537 lines (482 loc) · 22.3 KB
/
LoadReportClientTest.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.xds;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertEquals;
import static org.mockito.AdditionalAnswers.delegatesTo;
import static org.mockito.ArgumentMatchers.argThat;
import static org.mockito.ArgumentMatchers.eq;
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 static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.protobuf.Struct;
import com.google.protobuf.Value;
import com.google.protobuf.util.Durations;
import io.envoyproxy.envoy.api.v2.core.Locality;
import io.envoyproxy.envoy.api.v2.core.Node;
import io.envoyproxy.envoy.api.v2.endpoint.ClusterStats;
import io.envoyproxy.envoy.api.v2.endpoint.ClusterStats.DroppedRequests;
import io.envoyproxy.envoy.api.v2.endpoint.UpstreamLocalityStats;
import io.envoyproxy.envoy.service.load_stats.v2.LoadReportingServiceGrpc;
import io.envoyproxy.envoy.service.load_stats.v2.LoadStatsRequest;
import io.envoyproxy.envoy.service.load_stats.v2.LoadStatsResponse;
import io.grpc.Context;
import io.grpc.Context.CancellationListener;
import io.grpc.InternalLogId;
import io.grpc.ManagedChannel;
import io.grpc.Status;
import io.grpc.SynchronizationContext;
import io.grpc.inprocess.InProcessChannelBuilder;
import io.grpc.inprocess.InProcessServerBuilder;
import io.grpc.internal.BackoffPolicy;
import io.grpc.internal.FakeClock;
import io.grpc.stub.StreamObserver;
import io.grpc.testing.GrpcCleanupRule;
import io.grpc.xds.LoadReportClient.LoadReportCallback;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.annotation.Nullable;
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.ArgumentCaptor;
import org.mockito.ArgumentMatcher;
import org.mockito.Captor;
import org.mockito.InOrder;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
/**
* Unit tests for {@link LoadReportClient}.
*/
@RunWith(JUnit4.class)
public class LoadReportClientTest {
private static final String TARGET_NAME = "lrs-test.example.com";
// bootstrap node identifier
private static final Node NODE =
Node.newBuilder()
.setId("LRS test")
.setMetadata(
Struct.newBuilder()
.putFields(
"TRAFFICDIRECTOR_NETWORK_HOSTNAME",
Value.newBuilder().setStringValue("default").build()))
.build();
private static final FakeClock.TaskFilter LOAD_REPORTING_TASK_FILTER =
new FakeClock.TaskFilter() {
@Override
public boolean shouldAccept(Runnable command) {
return command.toString()
.contains(LoadReportClient.LoadReportingTask.class.getSimpleName());
}
};
private static final FakeClock.TaskFilter LRS_RPC_RETRY_TASK_FILTER =
new FakeClock.TaskFilter() {
@Override
public boolean shouldAccept(Runnable command) {
return command.toString()
.contains(LoadReportClient.LrsRpcRetryTask.class.getSimpleName());
}
};
@Rule
public final GrpcCleanupRule cleanupRule = new GrpcCleanupRule();
private final SynchronizationContext syncContext = new SynchronizationContext(
new Thread.UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread t, Throwable e) {
throw new AssertionError(e);
}
});
private final InternalLogId logId = InternalLogId.allocate("lrs-client-test", null);
private final FakeClock fakeClock = new FakeClock();
private final ArrayDeque<StreamObserver<LoadStatsRequest>> lrsRequestObservers =
new ArrayDeque<>();
private final AtomicBoolean callEnded = new AtomicBoolean(true);
@Mock
private BackoffPolicy.Provider backoffPolicyProvider;
@Mock
private BackoffPolicy backoffPolicy1;
@Mock
private BackoffPolicy backoffPolicy2;
@Mock
private LoadStatsStore loadStatsStore1;
@Mock
private LoadStatsStore loadStatsStore2;
@Mock
private LoadReportCallback callback;
@Captor
private ArgumentCaptor<StreamObserver<LoadStatsResponse>> lrsResponseObserverCaptor;
private LoadReportingServiceGrpc.LoadReportingServiceImplBase mockLoadReportingService;
private ManagedChannel channel;
private LoadReportClient lrsClient;
@SuppressWarnings("unchecked")
@Before
public void setUp() throws Exception {
MockitoAnnotations.initMocks(this);
mockLoadReportingService = mock(LoadReportingServiceGrpc.LoadReportingServiceImplBase.class,
delegatesTo(
new LoadReportingServiceGrpc.LoadReportingServiceImplBase() {
@Override
public StreamObserver<LoadStatsRequest> streamLoadStats(
final StreamObserver<LoadStatsResponse> responseObserver) {
assertThat(callEnded.get()).isTrue(); // ensure previous call was ended
callEnded.set(false);
Context.current().addListener(
new CancellationListener() {
@Override
public void cancelled(Context context) {
callEnded.set(true);
}
}, MoreExecutors.directExecutor());
StreamObserver<LoadStatsRequest> requestObserver =
mock(StreamObserver.class);
lrsRequestObservers.add(requestObserver);
return requestObserver;
}
}
));
cleanupRule.register(InProcessServerBuilder.forName("fakeLoadReportingServer").directExecutor()
.addService(mockLoadReportingService).build().start());
channel = cleanupRule.register(
InProcessChannelBuilder.forName("fakeLoadReportingServer").directExecutor().build());
when(backoffPolicyProvider.get()).thenReturn(backoffPolicy1, backoffPolicy2);
when(backoffPolicy1.nextBackoffNanos())
.thenReturn(TimeUnit.SECONDS.toNanos(1L), TimeUnit.SECONDS.toNanos(10L));
when(backoffPolicy2.nextBackoffNanos())
.thenReturn(TimeUnit.SECONDS.toNanos(2L), TimeUnit.SECONDS.toNanos(20L));
lrsClient =
new LoadReportClient(
logId,
TARGET_NAME,
channel,
NODE,
syncContext,
fakeClock.getScheduledExecutorService(),
backoffPolicyProvider,
fakeClock.getStopwatchSupplier());
lrsClient.startLoadReporting(callback);
}
@After
public void tearDown() {
lrsClient.stopLoadReporting();
assertThat(callEnded.get()).isTrue();
}
@Test
public void typicalWorkflow() {
verify(mockLoadReportingService).streamLoadStats(lrsResponseObserverCaptor.capture());
StreamObserver<LoadStatsResponse> responseObserver = lrsResponseObserverCaptor.getValue();
StreamObserver<LoadStatsRequest> requestObserver =
Iterables.getOnlyElement(lrsRequestObservers);
InOrder inOrder = inOrder(requestObserver, callback);
inOrder.verify(requestObserver).onNext(eq(buildInitialRequest()));
String cluster1 = "cluster-foo.googleapis.com";
ClusterStats rawStats1 = generateClusterLoadStats(cluster1, null);
when(loadStatsStore1.generateLoadReport()).thenReturn(rawStats1);
lrsClient.addLoadStatsStore(cluster1, null, loadStatsStore1);
// Management server asks to report loads for cluster1.
responseObserver.onNext(buildLrsResponse(ImmutableList.of(cluster1), 1000));
inOrder.verify(callback).onReportResponse(1000);
ClusterStats expectedStats1 =
rawStats1.toBuilder().setLoadReportInterval(Durations.fromNanos(1000)).build();
fakeClock.forwardNanos(999);
inOrder.verifyNoMoreInteractions();
fakeClock.forwardNanos(1);
inOrder.verify(requestObserver)
.onNext(argThat(new LoadStatsRequestMatcher(Collections.singletonList(expectedStats1))));
fakeClock.forwardNanos(1000);
inOrder.verify(requestObserver)
.onNext(argThat(new LoadStatsRequestMatcher(Collections.singletonList(expectedStats1))));
String cluster2 = "cluster-bar.googleapis.com";
ClusterStats rawStats2 = generateClusterLoadStats(cluster2, null);
when(loadStatsStore2.generateLoadReport()).thenReturn(rawStats2);
lrsClient.addLoadStatsStore(cluster2, null, loadStatsStore2);
// Management server updates the interval of sending load reports, while still asking for
// loads to cluster1 only.
responseObserver.onNext(buildLrsResponse(ImmutableList.of(cluster1), 2000));
inOrder.verify(callback).onReportResponse(2000);
expectedStats1 =
rawStats1.toBuilder().setLoadReportInterval(Durations.fromNanos(2000)).build();
fakeClock.forwardNanos(1000);
inOrder.verifyNoMoreInteractions();
fakeClock.forwardNanos(1000);
inOrder.verify(requestObserver)
.onNext(argThat(new LoadStatsRequestMatcher(Collections.singletonList(expectedStats1))));
// Management server asks to report loads for all clusters.
responseObserver.onNext(
LoadStatsResponse.newBuilder()
.setSendAllClusters(true)
.setLoadReportingInterval(Durations.fromNanos(2000))
.build());
inOrder.verify(callback).onReportResponse(2000);
ClusterStats expectedStats2 =
rawStats2.toBuilder().setLoadReportInterval(Durations.fromNanos(2000 + 2000)).build();
fakeClock.forwardNanos(2000);
inOrder.verify(requestObserver)
.onNext(
argThat(
new LoadStatsRequestMatcher(Arrays.asList(expectedStats1, expectedStats2))));
// Load reports for cluster1 is no longer wanted.
responseObserver.onNext(buildLrsResponse(Collections.singletonList(cluster2), 2000));
expectedStats2 =
rawStats2.toBuilder().setLoadReportInterval(Durations.fromNanos(2000)).build();
fakeClock.forwardNanos(2000);
inOrder.verify(requestObserver)
.onNext(argThat(new LoadStatsRequestMatcher(Collections.singletonList(expectedStats2))));
// Management server asks loads for a cluster that client has no load data.
responseObserver
.onNext(buildLrsResponse(ImmutableList.of("cluster-unknown.googleapis.com"), 2000));
fakeClock.forwardNanos(2000);
ArgumentCaptor<LoadStatsRequest> reportCaptor = ArgumentCaptor.forClass(null);
inOrder.verify(requestObserver).onNext(reportCaptor.capture());
assertThat(reportCaptor.getValue().getClusterStatsCount()).isEqualTo(0);
inOrder.verifyNoMoreInteractions();
}
@Test
public void lrsStreamClosedAndRetried() {
InOrder inOrder = inOrder(mockLoadReportingService, backoffPolicyProvider, backoffPolicy1,
backoffPolicy2);
inOrder.verify(mockLoadReportingService).streamLoadStats(lrsResponseObserverCaptor.capture());
StreamObserver<LoadStatsResponse> responseObserver = lrsResponseObserverCaptor.getValue();
assertThat(lrsRequestObservers).hasSize(1);
StreamObserver<LoadStatsRequest> requestObserver = lrsRequestObservers.poll();
String clusterName = "cluster-foo.googleapis.com";
String clusterServiceName = "service-blade.googleapis.com";
ClusterStats stats = generateClusterLoadStats(clusterName, clusterServiceName);
when(loadStatsStore1.generateLoadReport()).thenReturn(stats);
lrsClient.addLoadStatsStore(clusterName, null, loadStatsStore1);
// First balancer RPC
verify(requestObserver).onNext(eq(buildInitialRequest()));
assertEquals(0, fakeClock.numPendingTasks(LRS_RPC_RETRY_TASK_FILTER));
// Balancer closes it immediately (erroneously)
responseObserver.onCompleted();
// Will start backoff sequence 1 (1s)
inOrder.verify(backoffPolicyProvider).get();
inOrder.verify(backoffPolicy1).nextBackoffNanos();
assertEquals(1, fakeClock.numPendingTasks(LRS_RPC_RETRY_TASK_FILTER));
// Fast-forward to a moment before the retry
fakeClock.forwardNanos(TimeUnit.SECONDS.toNanos(1) - 1);
verifyNoMoreInteractions(mockLoadReportingService);
// Then time for retry
fakeClock.forwardNanos(1);
inOrder.verify(mockLoadReportingService).streamLoadStats(lrsResponseObserverCaptor.capture());
responseObserver = lrsResponseObserverCaptor.getValue();
assertThat(lrsRequestObservers).hasSize(1);
requestObserver = lrsRequestObservers.poll();
verify(requestObserver).onNext(eq(buildInitialRequest()));
assertEquals(0, fakeClock.numPendingTasks(LRS_RPC_RETRY_TASK_FILTER));
// Balancer closes it with an error.
responseObserver.onError(Status.UNAVAILABLE.asException());
// Will continue the backoff sequence 1 (10s)
verifyNoMoreInteractions(backoffPolicyProvider);
inOrder.verify(backoffPolicy1).nextBackoffNanos();
assertEquals(1, fakeClock.numPendingTasks(LRS_RPC_RETRY_TASK_FILTER));
// Fast-forward to a moment before the retry
fakeClock.forwardNanos(TimeUnit.SECONDS.toNanos(10) - 1);
verifyNoMoreInteractions(mockLoadReportingService);
// Then time for retry
fakeClock.forwardNanos(1);
inOrder.verify(mockLoadReportingService).streamLoadStats(lrsResponseObserverCaptor.capture());
responseObserver = lrsResponseObserverCaptor.getValue();
assertThat(lrsRequestObservers).hasSize(1);
requestObserver = lrsRequestObservers.poll();
verify(requestObserver).onNext(eq(buildInitialRequest()));
assertEquals(0, fakeClock.numPendingTasks(LRS_RPC_RETRY_TASK_FILTER));
// Balancer sends a response asking for loads of the cluster.
responseObserver
.onNext(buildLrsResponse(ImmutableList.of(clusterName), 5));
// Then breaks the RPC
responseObserver.onError(Status.UNAVAILABLE.asException());
// Will reset the retry sequence and retry immediately, because balancer has responded.
inOrder.verify(backoffPolicyProvider).get();
inOrder.verify(mockLoadReportingService).streamLoadStats(lrsResponseObserverCaptor.capture());
responseObserver = lrsResponseObserverCaptor.getValue();
assertThat(lrsRequestObservers).hasSize(1);
requestObserver = lrsRequestObservers.poll();
verify(requestObserver).onNext(eq(buildInitialRequest()));
// Fail the retry after spending 4ns
fakeClock.forwardNanos(4);
responseObserver.onError(Status.UNAVAILABLE.asException());
// Will be on the first retry (2s) of backoff sequence 2.
inOrder.verify(backoffPolicy2).nextBackoffNanos();
assertEquals(1, fakeClock.numPendingTasks(LRS_RPC_RETRY_TASK_FILTER));
// Fast-forward to a moment before the retry, the time spent in the last try is deducted.
fakeClock.forwardNanos(TimeUnit.SECONDS.toNanos(2) - 4 - 1);
verifyNoMoreInteractions(mockLoadReportingService);
// Then time for retry
fakeClock.forwardNanos(1);
inOrder.verify(mockLoadReportingService).streamLoadStats(lrsResponseObserverCaptor.capture());
assertThat(lrsRequestObservers).hasSize(1);
requestObserver = lrsRequestObservers.poll();
verify(requestObserver).onNext(eq(buildInitialRequest()));
assertEquals(0, fakeClock.numPendingTasks(LRS_RPC_RETRY_TASK_FILTER));
// Load reporting back to normal.
responseObserver = lrsResponseObserverCaptor.getValue();
responseObserver
.onNext(buildLrsResponse(ImmutableList.of(clusterName), 10));
fakeClock.forwardNanos(10);
ClusterStats expectedStats =
stats.toBuilder()
.setLoadReportInterval(
Durations.add(Durations.fromSeconds(1 + 10 + 2), Durations.fromNanos(10)))
.build();
verify(requestObserver)
.onNext(argThat(new LoadStatsRequestMatcher(Collections.singletonList(expectedStats))));
// Wrapping up
verify(backoffPolicyProvider, times(2)).get();
verify(backoffPolicy1, times(2)).nextBackoffNanos();
verify(backoffPolicy2, times(1)).nextBackoffNanos();
}
@Test
public void raceBetweenLoadReportingAndLbStreamClosure() {
verify(mockLoadReportingService).streamLoadStats(lrsResponseObserverCaptor.capture());
StreamObserver<LoadStatsResponse> responseObserver = lrsResponseObserverCaptor.getValue();
assertThat(lrsRequestObservers).hasSize(1);
StreamObserver<LoadStatsRequest> requestObserver = lrsRequestObservers.poll();
String clusterName = "cluster-foo.googleapis.com";
String clusterServiceName = "service-blade.googleapis.com";
ClusterStats stats = generateClusterLoadStats(clusterName, clusterServiceName);
when(loadStatsStore1.generateLoadReport()).thenReturn(stats);
lrsClient.addLoadStatsStore(clusterName, null, loadStatsStore1);
// First balancer RPC
verify(requestObserver).onNext(eq(buildInitialRequest()));
assertEquals(0, fakeClock.numPendingTasks(LRS_RPC_RETRY_TASK_FILTER));
// Simulate receiving a response from traffic director.
assertEquals(0, fakeClock.numPendingTasks(LOAD_REPORTING_TASK_FILTER));
responseObserver
.onNext(buildLrsResponse(ImmutableList.of("namespace-foo:service-blade"), 1983));
// Load reporting task is scheduled
assertEquals(1, fakeClock.numPendingTasks(LOAD_REPORTING_TASK_FILTER));
FakeClock.ScheduledTask scheduledTask =
Iterables.getOnlyElement(fakeClock.getPendingTasks(LOAD_REPORTING_TASK_FILTER));
assertEquals(1983, scheduledTask.getDelay(TimeUnit.NANOSECONDS));
// Close RPC stream.
responseObserver.onCompleted();
// Reporting task cancelled
assertEquals(0, fakeClock.numPendingTasks(LOAD_REPORTING_TASK_FILTER));
// Simulate a race condition where the task has just started when its cancelled
scheduledTask.command.run();
// No report sent. No new task scheduled
verifyNoMoreInteractions(requestObserver);
assertEquals(0, fakeClock.numPendingTasks(LOAD_REPORTING_TASK_FILTER));
}
private static LoadStatsResponse buildLrsResponse(
List<String> clusterNames, long loadReportIntervalNanos) {
return
LoadStatsResponse
.newBuilder()
.addAllClusters(clusterNames)
.setLoadReportingInterval(Durations.fromNanos(loadReportIntervalNanos))
.build();
}
private static LoadStatsRequest buildInitialRequest() {
return
LoadStatsRequest.newBuilder()
.setNode(
Node.newBuilder()
.setId("LRS test")
.setMetadata(
Struct.newBuilder()
.putFields(
"TRAFFICDIRECTOR_NETWORK_HOSTNAME",
Value.newBuilder().setStringValue("default").build())
.putFields(
LoadReportClient.TARGET_NAME_METADATA_KEY,
Value.newBuilder().setStringValue(TARGET_NAME).build())))
.build();
}
/**
* Generates a raw service load stats report with random data.
*/
private static ClusterStats generateClusterLoadStats(
String clusterName, @Nullable String clusterServiceName) {
long callsInProgress = ThreadLocalRandom.current().nextLong(Long.MAX_VALUE);
long callsSucceeded = ThreadLocalRandom.current().nextLong(Long.MAX_VALUE);
long callsFailed = ThreadLocalRandom.current().nextLong(Long.MAX_VALUE);
long callsIssued = ThreadLocalRandom.current().nextLong(Long.MAX_VALUE);
long numLbDrops = ThreadLocalRandom.current().nextLong(Long.MAX_VALUE);
long numThrottleDrops = ThreadLocalRandom.current().nextLong(Long.MAX_VALUE);
ClusterStats.Builder clusterStatsBuilder = ClusterStats.newBuilder();
clusterStatsBuilder.setClusterName(clusterName);
if (clusterServiceName != null) {
clusterStatsBuilder.setClusterServiceName(clusterServiceName);
}
clusterStatsBuilder.addUpstreamLocalityStats(
UpstreamLocalityStats.newBuilder()
.setLocality(
Locality.newBuilder()
.setRegion(clusterName + "-region-foo")
.setZone(clusterName + "-zone-bar")
.setSubZone(clusterName + "-subzone-baz"))
.setTotalRequestsInProgress(callsInProgress)
.setTotalSuccessfulRequests(callsSucceeded)
.setTotalErrorRequests(callsFailed)
.setTotalIssuedRequests(callsIssued))
.addDroppedRequests(
DroppedRequests.newBuilder()
.setCategory("lb")
.setDroppedCount(numLbDrops))
.addDroppedRequests(
DroppedRequests.newBuilder()
.setCategory("throttle")
.setDroppedCount(numThrottleDrops))
.setTotalDroppedRequests(numLbDrops + numThrottleDrops);
return clusterStatsBuilder.build();
}
/**
* For comparing LoadStatsRequest stats data regardless of .
*/
private static class LoadStatsRequestMatcher implements ArgumentMatcher<LoadStatsRequest> {
private final Map<String, ClusterStats> expectedStats = new HashMap<>();
LoadStatsRequestMatcher(Collection<ClusterStats> clusterStats) {
for (ClusterStats stats : clusterStats) {
expectedStats.put(stats.getClusterName(), stats);
}
}
@Override
public boolean matches(LoadStatsRequest argument) {
if (!argument.getNode().getMetadata()
.getFieldsOrThrow(LoadReportClient.TARGET_NAME_METADATA_KEY)
.getStringValue().equals(TARGET_NAME)) {
return false;
}
if (argument.getClusterStatsCount() != expectedStats.size()) {
return false;
}
for (ClusterStats stats : argument.getClusterStatsList()) {
if (!stats.equals(expectedStats.get(stats.getClusterName()))) {
return false;
}
}
return true;
}
}
}