#19855

Committed 09 Jun 2025 02:13PM UTC coverage: 88.609% (+0.006%) from 88.603%

Build # #19855

Build Type

push

github

Committed by

ejona86

Commit Message

xds: cancelled=true on watch close in XdsDepManager

1fd29bc80 replaced cancelWatcher() with watcher.close(). But setting
cancelled was missing. Because the config update checks for shutdown,
the cancelled flag no longer avoids exceptions. But it seems best to
continue avoiding any processing after close to avoid surprises.

Run Details

34700 of 39161 relevant lines covered (88.61%)

0.89 hits per line

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92.89

/../xds/src/main/java/io/grpc/xds/XdsDependencyManager.java

/*
 * Copyright 2024 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.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static io.grpc.xds.client.XdsClient.ResourceUpdate;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import io.grpc.NameResolver;
import io.grpc.Status;
import io.grpc.StatusOr;
import io.grpc.SynchronizationContext;
import io.grpc.xds.VirtualHost.Route.RouteAction.ClusterWeight;
import io.grpc.xds.XdsClusterResource.CdsUpdate.ClusterType;
import io.grpc.xds.XdsConfig.XdsClusterConfig.AggregateConfig;
import io.grpc.xds.XdsConfig.XdsClusterConfig.EndpointConfig;
import io.grpc.xds.XdsRouteConfigureResource.RdsUpdate;
import io.grpc.xds.client.XdsClient;
import io.grpc.xds.client.XdsClient.ResourceWatcher;
import io.grpc.xds.client.XdsResourceType;
import java.io.Closeable;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ScheduledExecutorService;
import javax.annotation.Nullable;

/**
 * This class acts as a layer of indirection between the XdsClient and the NameResolver. It
 * maintains the watchers for the xds resources and when an update is received, it either requests
 * referenced resources or updates the XdsConfig and notifies the XdsConfigWatcher.  Each instance
 * applies to a single data plane authority.
 */
final class XdsDependencyManager implements XdsConfig.XdsClusterSubscriptionRegistry {
  public static final XdsClusterResource CLUSTER_RESOURCE = XdsClusterResource.getInstance();
  public static final XdsEndpointResource ENDPOINT_RESOURCE = XdsEndpointResource.getInstance();
  private static final int MAX_CLUSTER_RECURSION_DEPTH = 16; // Matches C++
  private final String listenerName;
  private final XdsClient xdsClient;
  private final XdsConfigWatcher xdsConfigWatcher;
  private final SynchronizationContext syncContext;
  private final String dataPlaneAuthority;

  private StatusOr<XdsConfig> lastUpdate = null;
  private final Map<XdsResourceType<?>, TypeWatchers<?>> resourceWatchers = new HashMap<>();
  private final Set<ClusterSubscription> subscriptions = new HashSet<>();

  XdsDependencyManager(XdsClient xdsClient, XdsConfigWatcher xdsConfigWatcher,
                       SynchronizationContext syncContext, String dataPlaneAuthority,
                       String listenerName, NameResolver.Args nameResolverArgs,
                       ScheduledExecutorService scheduler) {
    this.listenerName = checkNotNull(listenerName, "listenerName");
    this.xdsClient = checkNotNull(xdsClient, "xdsClient");
    this.xdsConfigWatcher = checkNotNull(xdsConfigWatcher, "xdsConfigWatcher");
    this.syncContext = checkNotNull(syncContext, "syncContext");
    this.dataPlaneAuthority = checkNotNull(dataPlaneAuthority, "dataPlaneAuthority");
    checkNotNull(nameResolverArgs, "nameResolverArgs");
    checkNotNull(scheduler, "scheduler");

    // start the ball rolling
    syncContext.execute(() -> addWatcher(new LdsWatcher(listenerName)));
  }

  public static String toContextStr(String typeName, String resourceName) {
    return typeName + " resource " + resourceName;
  }

  @Override
  public Closeable subscribeToCluster(String clusterName) {
    checkNotNull(clusterName, "clusterName");
    ClusterSubscription subscription = new ClusterSubscription(clusterName);

    syncContext.execute(() -> {
      if (getWatchers(XdsListenerResource.getInstance()).isEmpty()) {
        subscription.closed = true;
        return; // shutdown() called
      }
      subscriptions.add(subscription);
      addClusterWatcher(clusterName);
    });

    return subscription;
  }

  private <T extends ResourceUpdate> void addWatcher(XdsWatcherBase<T> watcher) {
    syncContext.throwIfNotInThisSynchronizationContext();
    XdsResourceType<T> type = watcher.type;
    String resourceName = watcher.resourceName;

    getWatchers(type).put(resourceName, watcher);
    xdsClient.watchXdsResource(type, resourceName, watcher, syncContext);
  }

  public void shutdown() {
    syncContext.execute(() -> {
      for (TypeWatchers<?> watchers : resourceWatchers.values()) {
        shutdownWatchersForType(watchers);
      }
      resourceWatchers.clear();
      subscriptions.clear();
    });
  }

  private <T extends ResourceUpdate> void shutdownWatchersForType(TypeWatchers<T> watchers) {
    for (Map.Entry<String, XdsWatcherBase<T>> watcherEntry : watchers.watchers.entrySet()) {
      xdsClient.cancelXdsResourceWatch(watchers.resourceType, watcherEntry.getKey(),
          watcherEntry.getValue());
      watcherEntry.getValue().cancelled = true;
    }
  }

  private void releaseSubscription(ClusterSubscription subscription) {
    checkNotNull(subscription, "subscription");
    syncContext.execute(() -> {
      if (subscription.closed) {
        return;
      }
      subscription.closed = true;
      if (!subscriptions.remove(subscription)) {
        return; // shutdown() called
      }
      maybePublishConfig();
    });
  }

  /**
   * Check if all resources have results, and if so, generate a new XdsConfig and send it to all
   * the watchers.
   */
  private void maybePublishConfig() {
    syncContext.throwIfNotInThisSynchronizationContext();
    if (getWatchers(XdsListenerResource.getInstance()).isEmpty()) {
      return; // shutdown() called
    }
    boolean waitingOnResource = resourceWatchers.values().stream()
        .flatMap(typeWatchers -> typeWatchers.watchers.values().stream())
        .anyMatch(XdsWatcherBase::missingResult);
    if (waitingOnResource) {
      return;
    }

    StatusOr<XdsConfig> newUpdate = buildUpdate();
    if (Objects.equals(newUpdate, lastUpdate)) {
      return;
    }
    assert newUpdate.hasValue()
        || (newUpdate.getStatus().getCode() == Status.Code.UNAVAILABLE
            || newUpdate.getStatus().getCode() == Status.Code.INTERNAL);
    lastUpdate = newUpdate;
    xdsConfigWatcher.onUpdate(lastUpdate);
  }

  @VisibleForTesting
  StatusOr<XdsConfig> buildUpdate() {
    // Create a config and discard any watchers not accessed
    WatcherTracer tracer = new WatcherTracer(resourceWatchers);
    StatusOr<XdsConfig> config = buildUpdate(
        tracer, listenerName, dataPlaneAuthority, subscriptions);
    tracer.closeUnusedWatchers();
    return config;
  }

  private static StatusOr<XdsConfig> buildUpdate(
      WatcherTracer tracer,
      String listenerName,
      String dataPlaneAuthority,
      Set<ClusterSubscription> subscriptions) {
    XdsConfig.XdsConfigBuilder builder = new XdsConfig.XdsConfigBuilder();

    // Iterate watchers and build the XdsConfig

    XdsWatcherBase<XdsListenerResource.LdsUpdate> ldsWatcher
        = tracer.getWatcher(XdsListenerResource.getInstance(), listenerName);
    if (ldsWatcher == null) {
      return StatusOr.fromStatus(Status.UNAVAILABLE.withDescription(
          "Bug: No listener watcher found for " + listenerName));
    }
    if (!ldsWatcher.getData().hasValue()) {
      return StatusOr.fromStatus(ldsWatcher.getData().getStatus());
    }
    XdsListenerResource.LdsUpdate ldsUpdate = ldsWatcher.getData().getValue();
    builder.setListener(ldsUpdate);

    RdsUpdateSupplier routeSource = ((LdsWatcher) ldsWatcher).getRouteSource(tracer);
    if (routeSource == null) {
      return StatusOr.fromStatus(Status.UNAVAILABLE.withDescription(
          "Bug: No route source found for listener " + dataPlaneAuthority));
    }
    StatusOr<RdsUpdate> statusOrRdsUpdate = routeSource.getRdsUpdate();
    if (!statusOrRdsUpdate.hasValue()) {
      return StatusOr.fromStatus(statusOrRdsUpdate.getStatus());
    }
    RdsUpdate rdsUpdate = statusOrRdsUpdate.getValue();
    builder.setRoute(rdsUpdate);

    VirtualHost activeVirtualHost =
        RoutingUtils.findVirtualHostForHostName(rdsUpdate.virtualHosts, dataPlaneAuthority);
    if (activeVirtualHost == null) {
      String error = "Failed to find virtual host matching hostname: " + dataPlaneAuthority;
      return StatusOr.fromStatus(Status.UNAVAILABLE.withDescription(error));
    }
    builder.setVirtualHost(activeVirtualHost);

    Map<String, StatusOr<XdsConfig.XdsClusterConfig>> clusters = new HashMap<>();
    LinkedHashSet<String> ancestors = new LinkedHashSet<>();
    for (String cluster : getClusterNamesFromVirtualHost(activeVirtualHost)) {
      addConfigForCluster(clusters, cluster, ancestors, tracer);
    }
    for (ClusterSubscription subscription : subscriptions) {
      addConfigForCluster(clusters, subscription.getClusterName(), ancestors, tracer);
    }
    for (Map.Entry<String, StatusOr<XdsConfig.XdsClusterConfig>> me : clusters.entrySet()) {
      builder.addCluster(me.getKey(), me.getValue());
    }

    return StatusOr.fromValue(builder.build());
  }

  private <T extends ResourceUpdate> Map<String, XdsWatcherBase<T>> getWatchers(
      XdsResourceType<T> resourceType) {
    TypeWatchers<?> typeWatchers = resourceWatchers.get(resourceType);
    if (typeWatchers == null) {
      typeWatchers = new TypeWatchers<T>(resourceType);
      resourceWatchers.put(resourceType, typeWatchers);
    }
    assert typeWatchers.resourceType == resourceType;
    @SuppressWarnings("unchecked")
    TypeWatchers<T> tTypeWatchers = (TypeWatchers<T>) typeWatchers;
    return tTypeWatchers.watchers;
  }

  private static void addConfigForCluster(
      Map<String, StatusOr<XdsConfig.XdsClusterConfig>> clusters,
      String clusterName,
      @SuppressWarnings("NonApiType") // Need order-preserving set for errors
      LinkedHashSet<String> ancestors,
      WatcherTracer tracer) {
    if (clusters.containsKey(clusterName)) {
      return;
    }
    if (ancestors.contains(clusterName)) {
      clusters.put(clusterName, StatusOr.fromStatus(
          Status.INTERNAL.withDescription(
              "Aggregate cluster cycle detected: " + ancestors)));
      return;
    }
    if (ancestors.size() > MAX_CLUSTER_RECURSION_DEPTH) {
      clusters.put(clusterName, StatusOr.fromStatus(
          Status.INTERNAL.withDescription("Recursion limit reached: " + ancestors)));
      return;
    }

    CdsWatcher cdsWatcher = (CdsWatcher) tracer.getWatcher(CLUSTER_RESOURCE, clusterName);
    StatusOr<XdsClusterResource.CdsUpdate> cdsWatcherDataOr = cdsWatcher.getData();
    if (!cdsWatcherDataOr.hasValue()) {
      clusters.put(clusterName, StatusOr.fromStatus(cdsWatcherDataOr.getStatus()));
      return;
    }

    XdsClusterResource.CdsUpdate cdsUpdate = cdsWatcherDataOr.getValue();
    XdsConfig.XdsClusterConfig.ClusterChild child;
    switch (cdsUpdate.clusterType()) {
      case AGGREGATE:
        // Re-inserting a present element into a LinkedHashSet does not reorder the entries, so it
        // preserves the priority across all aggregate clusters
        LinkedHashSet<String> leafNames = new LinkedHashSet<String>();
        ancestors.add(clusterName);
        for (String childCluster : cdsUpdate.prioritizedClusterNames()) {
          addConfigForCluster(clusters, childCluster, ancestors, tracer);
          StatusOr<XdsConfig.XdsClusterConfig> config = clusters.get(childCluster);
          if (!config.hasValue()) {
            clusters.put(clusterName, StatusOr.fromStatus(Status.INTERNAL.withDescription(
                "Unable to get leaves for " + clusterName + ": "
                + config.getStatus().getDescription())));
            return;
          }
          XdsConfig.XdsClusterConfig.ClusterChild children = config.getValue().getChildren();
          if (children instanceof AggregateConfig) {
            leafNames.addAll(((AggregateConfig) children).getLeafNames());
          } else {
            leafNames.add(childCluster);
          }
        }
        ancestors.remove(clusterName);

        child = new AggregateConfig(ImmutableList.copyOf(leafNames));
        break;
      case EDS:
        XdsWatcherBase<XdsEndpointResource.EdsUpdate> edsWatcher =
            tracer.getWatcher(ENDPOINT_RESOURCE, cdsWatcher.getEdsServiceName());
        if (edsWatcher != null) {
          child = new EndpointConfig(edsWatcher.getData());
        } else {
          child = new EndpointConfig(StatusOr.fromStatus(Status.INTERNAL.withDescription(
              "EDS resource not found for cluster " + clusterName)));
        }
        break;
      case LOGICAL_DNS:
        // TODO get the resolved endpoint configuration
        child = new EndpointConfig(StatusOr.fromStatus(
            Status.INTERNAL.withDescription("Logical DNS in dependency manager unsupported")));
        break;
      default:
        throw new IllegalStateException("Unexpected value: " + cdsUpdate.clusterType());
    }
    clusters.put(clusterName, StatusOr.fromValue(
        new XdsConfig.XdsClusterConfig(clusterName, cdsUpdate, child)));
  }

  private void addRdsWatcher(String resourceName) {
    if (getWatchers(XdsRouteConfigureResource.getInstance()).containsKey(resourceName)) {
      return;
    }

    addWatcher(new RdsWatcher(resourceName));
  }

  private void addEdsWatcher(String edsServiceName) {
    if (getWatchers(XdsEndpointResource.getInstance()).containsKey(edsServiceName)) {
      return;
    }

    addWatcher(new EdsWatcher(edsServiceName));
  }

  private void addClusterWatcher(String clusterName) {
    if (getWatchers(CLUSTER_RESOURCE).containsKey(clusterName)) {
      return;
    }

    addWatcher(new CdsWatcher(clusterName));
  }

  private void updateRoutes(List<VirtualHost> virtualHosts) {
    VirtualHost virtualHost =
        RoutingUtils.findVirtualHostForHostName(virtualHosts, dataPlaneAuthority);
    Set<String> newClusters = getClusterNamesFromVirtualHost(virtualHost);
    newClusters.forEach((cluster) -> addClusterWatcher(cluster));
  }

  private String nodeInfo() {
    return " nodeID: " + xdsClient.getBootstrapInfo().node().getId();
  }

  private static Set<String> getClusterNamesFromVirtualHost(VirtualHost virtualHost) {
    if (virtualHost == null) {
      return Collections.emptySet();
    }

    // Get all cluster names to which requests can be routed through the virtual host.
    Set<String> clusters = new HashSet<>();
    for (VirtualHost.Route route : virtualHost.routes()) {
      VirtualHost.Route.RouteAction action = route.routeAction();
      if (action == null) {
        continue;
      }
      if (action.cluster() != null) {
        clusters.add(action.cluster());
      } else if (action.weightedClusters() != null) {
        for (ClusterWeight weighedCluster : action.weightedClusters()) {
          clusters.add(weighedCluster.name());
        }
      }
    }

    return clusters;
  }

  private static class TypeWatchers<T extends ResourceUpdate> {
    // Key is resource name
    final Map<String, XdsWatcherBase<T>> watchers = new HashMap<>();
    final XdsResourceType<T> resourceType;

    TypeWatchers(XdsResourceType<T> resourceType) {
      this.resourceType = resourceType;
    }
  }

  public interface XdsConfigWatcher {
    /**
     * An updated XdsConfig or RPC-safe Status. The status code will be either UNAVAILABLE or
     * INTERNAL.
     */
    void onUpdate(StatusOr<XdsConfig> config);
  }

  private final class ClusterSubscription implements Closeable {
    private final String clusterName;
    boolean closed; // Accessed from syncContext

    public ClusterSubscription(String clusterName) {
      this.clusterName = checkNotNull(clusterName, "clusterName");
    }

    String getClusterName() {
      return clusterName;
    }

    @Override
    public void close() throws IOException {
      releaseSubscription(this);
    }
  }

  /** State for tracing garbage collector. */
  private static final class WatcherTracer {
    private final Map<XdsResourceType<?>, TypeWatchers<?>> resourceWatchers;
    private final Map<XdsResourceType<?>, TypeWatchers<?>> usedWatchers;

    public WatcherTracer(Map<XdsResourceType<?>, TypeWatchers<?>> resourceWatchers) {
      this.resourceWatchers = resourceWatchers;

      this.usedWatchers = new HashMap<>();
      for (XdsResourceType<?> type : resourceWatchers.keySet()) {
        usedWatchers.put(type, newTypeWatchers(type));
      }
    }

    private static <T extends ResourceUpdate> TypeWatchers<T> newTypeWatchers(
        XdsResourceType<T> type) {
      return new TypeWatchers<T>(type);
    }

    public <T extends ResourceUpdate> XdsWatcherBase<T> getWatcher(
        XdsResourceType<T> resourceType, String name) {
      TypeWatchers<?> typeWatchers = resourceWatchers.get(resourceType);
      if (typeWatchers == null) {
        return null;
      }
      assert typeWatchers.resourceType == resourceType;
      @SuppressWarnings("unchecked")
      TypeWatchers<T> tTypeWatchers = (TypeWatchers<T>) typeWatchers;
      XdsWatcherBase<T> watcher = tTypeWatchers.watchers.get(name);
      if (watcher == null) {
        return null;
      }
      @SuppressWarnings("unchecked")
      TypeWatchers<T> usedTypeWatchers = (TypeWatchers<T>) usedWatchers.get(resourceType);
      usedTypeWatchers.watchers.put(name, watcher);
      return watcher;
    }

    /** Shut down unused watchers. */
    public void closeUnusedWatchers() {
      boolean changed = false; // Help out the GC by preferring old objects
      for (XdsResourceType<?> type : resourceWatchers.keySet()) {
        TypeWatchers<?> orig = resourceWatchers.get(type);
        TypeWatchers<?> used = usedWatchers.get(type);
        for (String name : orig.watchers.keySet()) {
          if (used.watchers.containsKey(name)) {
            continue;
          }
          orig.watchers.get(name).close();
          changed = true;
        }
      }
      if (changed) {
        resourceWatchers.putAll(usedWatchers);
      }
    }
  }

  private abstract class XdsWatcherBase<T extends ResourceUpdate>
      implements ResourceWatcher<T> {
    private final XdsResourceType<T> type;
    private final String resourceName;
    boolean cancelled;

    @Nullable
    private StatusOr<T> data;


    private XdsWatcherBase(XdsResourceType<T> type, String resourceName) {
      this.type = checkNotNull(type, "type");
      this.resourceName = checkNotNull(resourceName, "resourceName");
    }

    @Override
    public void onError(Status error) {
      checkNotNull(error, "error");
      if (cancelled) {
        return;
      }
      // Don't update configuration on error, if we've already received configuration
      if (!hasDataValue()) {
        setDataAsStatus(Status.UNAVAILABLE.withDescription(
            String.format("Error retrieving %s: %s: %s",
              toContextString(), error.getCode(), error.getDescription())));
        maybePublishConfig();
      }
    }

    @Override
    public void onResourceDoesNotExist(String resourceName) {
      if (cancelled) {
        return;
      }

      checkArgument(this.resourceName.equals(resourceName), "Resource name does not match");
      setDataAsStatus(Status.UNAVAILABLE.withDescription(
          toContextString() + " does not exist" + nodeInfo()));
      maybePublishConfig();
    }

    public void close() {
      cancelled = true;
      xdsClient.cancelXdsResourceWatch(type, resourceName, this);
    }

    boolean missingResult() {
      return data == null;
    }

    @Nullable
    StatusOr<T> getData() {
      return data;
    }

    boolean hasDataValue() {
      return data != null && data.hasValue();
    }

    String resourceName() {
      return resourceName;
    }

    protected void setData(T data) {
      checkNotNull(data, "data");
      this.data = StatusOr.fromValue(data);
    }

    protected void setDataAsStatus(Status status) {
      checkNotNull(status, "status");
      this.data = StatusOr.fromStatus(status);
    }

    public String toContextString() {
      return toContextStr(type.typeName(), resourceName);
    }
  }

  private interface RdsUpdateSupplier {
    StatusOr<RdsUpdate> getRdsUpdate();
  }

  private class LdsWatcher extends XdsWatcherBase<XdsListenerResource.LdsUpdate>
      implements RdsUpdateSupplier {
    String rdsName;

    private LdsWatcher(String resourceName) {
      super(XdsListenerResource.getInstance(), resourceName);
    }

    @Override
    public void onChanged(XdsListenerResource.LdsUpdate update) {
      checkNotNull(update, "update");
      if (cancelled) {
        return;
      }

      HttpConnectionManager httpConnectionManager = update.httpConnectionManager();
      List<VirtualHost> virtualHosts;
      String rdsName;
      if (httpConnectionManager == null) {
        // TCP listener. Unsupported config
        virtualHosts = Collections.emptyList(); // Not null, to not delegate to RDS
        rdsName = null;
      } else {
        virtualHosts = httpConnectionManager.virtualHosts();
        rdsName = httpConnectionManager.rdsName();
      }

      if (virtualHosts != null) {
        // No RDS watcher since we are getting RDS updates via LDS
        updateRoutes(virtualHosts);
        this.rdsName = null;
      } else {
        this.rdsName = rdsName;
        addRdsWatcher(rdsName);
      }

      setData(update);
      maybePublishConfig();
    }

    @Override
    public void onResourceDoesNotExist(String resourceName) {
      if (cancelled) {
        return;
      }

      checkArgument(resourceName().equals(resourceName), "Resource name does not match");
      setDataAsStatus(Status.UNAVAILABLE.withDescription(
          toContextString() + " does not exist" + nodeInfo()));
      rdsName = null;
      maybePublishConfig();
    }

    private RdsWatcher getRdsWatcher(WatcherTracer tracer) {
      if (rdsName == null) {
        return null;
      }
      return (RdsWatcher) tracer.getWatcher(XdsRouteConfigureResource.getInstance(), rdsName);
    }

    public RdsUpdateSupplier getRouteSource(WatcherTracer tracer) {
      if (!hasDataValue()) {
        return this;
      }
      HttpConnectionManager hcm = getData().getValue().httpConnectionManager();
      if (hcm == null) {
        return this;
      }
      List<VirtualHost> virtualHosts = hcm.virtualHosts();
      if (virtualHosts != null) {
        return this;
      }
      RdsWatcher rdsWatcher = getRdsWatcher(tracer);
      assert rdsWatcher != null;
      return rdsWatcher;
    }

    @Override
    public StatusOr<RdsUpdate> getRdsUpdate() {
      if (missingResult()) {
        return StatusOr.fromStatus(Status.UNAVAILABLE.withDescription("Not yet loaded"));
      }
      if (!getData().hasValue()) {
        return StatusOr.fromStatus(getData().getStatus());
      }
      HttpConnectionManager hcm = getData().getValue().httpConnectionManager();
      if (hcm == null) {
        return StatusOr.fromStatus(
            Status.UNAVAILABLE.withDescription("Not an API listener" + nodeInfo()));
      }
      List<VirtualHost> virtualHosts = hcm.virtualHosts();
      if (virtualHosts == null) {
        // Code shouldn't trigger this case, as it should be calling RdsWatcher instead. This would
        // be easily implemented with getRdsWatcher().getRdsUpdate(), but getting here is likely a
        // bug
        return StatusOr.fromStatus(Status.INTERNAL.withDescription("Routes are in RDS, not LDS"));
      }
      return StatusOr.fromValue(new RdsUpdate(virtualHosts));
    }
  }

  private class RdsWatcher extends XdsWatcherBase<RdsUpdate> implements RdsUpdateSupplier {

    public RdsWatcher(String resourceName) {
      super(XdsRouteConfigureResource.getInstance(), checkNotNull(resourceName, "resourceName"));
    }

    @Override
    public void onChanged(RdsUpdate update) {
      checkNotNull(update, "update");
      if (cancelled) {
        return;
      }
      setData(update);
      updateRoutes(update.virtualHosts);
      maybePublishConfig();
    }

    @Override
    public StatusOr<RdsUpdate> getRdsUpdate() {
      if (missingResult()) {
        return StatusOr.fromStatus(Status.UNAVAILABLE.withDescription("Not yet loaded"));
      }
      return getData();
    }
  }

  private class CdsWatcher extends XdsWatcherBase<XdsClusterResource.CdsUpdate> {
    CdsWatcher(String resourceName) {
      super(CLUSTER_RESOURCE, checkNotNull(resourceName, "resourceName"));
    }

    @Override
    public void onChanged(XdsClusterResource.CdsUpdate update) {
      checkNotNull(update, "update");
      if (cancelled) {
        return;
      }
      switch (update.clusterType()) {
        case EDS:
          setData(update);
          addEdsWatcher(getEdsServiceName());
          break;
        case LOGICAL_DNS:
          setData(update);
          // no eds needed
          break;
        case AGGREGATE:
          setData(update);
          update.prioritizedClusterNames()
              .forEach(name -> addClusterWatcher(name));
          break;
        default:
          Status error = Status.UNAVAILABLE.withDescription(
              "unknown cluster type in " + resourceName() + " " + update.clusterType());
          setDataAsStatus(error);
      }
      maybePublishConfig();
    }

    public String getEdsServiceName() {
      XdsClusterResource.CdsUpdate cdsUpdate = getData().getValue();
      assert cdsUpdate.clusterType() == ClusterType.EDS;
      String edsServiceName = cdsUpdate.edsServiceName();
      if (edsServiceName == null) {
        edsServiceName = cdsUpdate.clusterName();
      }
      return edsServiceName;
    }
  }

  private class EdsWatcher extends XdsWatcherBase<XdsEndpointResource.EdsUpdate> {
    private EdsWatcher(String resourceName) {
      super(ENDPOINT_RESOURCE, checkNotNull(resourceName, "resourceName"));
    }

    @Override
    public void onChanged(XdsEndpointResource.EdsUpdate update) {
      if (cancelled) {
        return;
      }
      setData(checkNotNull(update, "update"));
      maybePublishConfig();
    }
  }
}

grpc / grpc-java / #19855

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