#19572

Committed 27 Nov 2024 10:56PM CUT coverage: 84.622%. Remained the same

Build # #19572

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push

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web-flow

Commit Message

[CSM] Use xds-enabled server and xds credentials in examples (#11706)

Backport #11706 to v1.68.x

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/../xds/src/main/java/io/grpc/xds/client/ControlPlaneClient.java

/*
 * 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.xds.client;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Stopwatch;
import com.google.common.base.Supplier;
import com.google.protobuf.Any;
import com.google.rpc.Code;
import io.envoyproxy.envoy.service.discovery.v3.AggregatedDiscoveryServiceGrpc;
import io.envoyproxy.envoy.service.discovery.v3.DiscoveryRequest;
import io.envoyproxy.envoy.service.discovery.v3.DiscoveryResponse;
import io.grpc.InternalLogId;
import io.grpc.MethodDescriptor;
import io.grpc.Status;
import io.grpc.SynchronizationContext;
import io.grpc.SynchronizationContext.ScheduledHandle;
import io.grpc.internal.BackoffPolicy;
import io.grpc.xds.client.Bootstrapper.ServerInfo;
import io.grpc.xds.client.EnvoyProtoData.Node;
import io.grpc.xds.client.XdsClient.ProcessingTracker;
import io.grpc.xds.client.XdsClient.ResourceStore;
import io.grpc.xds.client.XdsClient.XdsResponseHandler;
import io.grpc.xds.client.XdsLogger.XdsLogLevel;
import io.grpc.xds.client.XdsTransportFactory.EventHandler;
import io.grpc.xds.client.XdsTransportFactory.StreamingCall;
import io.grpc.xds.client.XdsTransportFactory.XdsTransport;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;

/**
 * Common base type for XdsClient implementations, which encapsulates the layer abstraction of
 * the xDS RPC stream.
 */
final class ControlPlaneClient {

  private final SynchronizationContext syncContext;
  private final InternalLogId logId;
  private final XdsLogger logger;
  private final ServerInfo serverInfo;
  private final XdsTransport xdsTransport;
  private final XdsResponseHandler xdsResponseHandler;
  private final ResourceStore resourceStore;
  private final ScheduledExecutorService timeService;
  private final BackoffPolicy.Provider backoffPolicyProvider;
  private final Stopwatch stopwatch;
  private final Node bootstrapNode;
  private final XdsClient xdsClient;

  // Last successfully applied version_info for each resource type. Starts with empty string.
  // A version_info is used to update management server with client's most recent knowledge of
  // resources.
  private final Map<XdsResourceType<?>, String> versions = new HashMap<>();

  private boolean shutdown;
  @Nullable
  private AdsStream adsStream;
  @Nullable
  private BackoffPolicy retryBackoffPolicy;
  @Nullable
  private ScheduledHandle rpcRetryTimer;
  private MessagePrettyPrinter messagePrinter;

  /** An entity that manages ADS RPCs over a single channel. */
  ControlPlaneClient(
      XdsTransport xdsTransport,
      ServerInfo serverInfo,
      Node bootstrapNode,
      XdsResponseHandler xdsResponseHandler,
      ResourceStore resourceStore,
      ScheduledExecutorService
      timeService,
      SynchronizationContext syncContext,
      BackoffPolicy.Provider backoffPolicyProvider,
      Supplier<Stopwatch> stopwatchSupplier,
      XdsClient xdsClient,
      MessagePrettyPrinter messagePrinter) {
    this.serverInfo = checkNotNull(serverInfo, "serverInfo");
    this.xdsTransport = checkNotNull(xdsTransport, "xdsTransport");
    this.xdsResponseHandler = checkNotNull(xdsResponseHandler, "xdsResponseHandler");
    this.resourceStore = checkNotNull(resourceStore, "resourcesSubscriber");
    this.bootstrapNode = checkNotNull(bootstrapNode, "bootstrapNode");
    this.timeService = checkNotNull(timeService, "timeService");
    this.syncContext = checkNotNull(syncContext, "syncContext");
    this.backoffPolicyProvider = checkNotNull(backoffPolicyProvider, "backoffPolicyProvider");
    this.xdsClient = checkNotNull(xdsClient, "xdsClient");
    this.messagePrinter = checkNotNull(messagePrinter, "messagePrinter");
    stopwatch = checkNotNull(stopwatchSupplier, "stopwatchSupplier").get();
    logId = InternalLogId.allocate("xds-client", serverInfo.target());
    logger = XdsLogger.withLogId(logId);
    logger.log(XdsLogLevel.INFO, "Created");
  }

  void shutdown() {
    syncContext.execute(new Runnable() {
      @Override
      public void run() {
        shutdown = true;
        logger.log(XdsLogLevel.INFO, "Shutting down");
        if (adsStream != null) {
          adsStream.close(Status.CANCELLED.withDescription("shutdown").asException());
        }
        if (rpcRetryTimer != null && rpcRetryTimer.isPending()) {
          rpcRetryTimer.cancel();
        }
        xdsTransport.shutdown();
      }
    });
  }

  @Override
  public String toString() {
    return logId.toString();
  }

  /**
   * Updates the resource subscription for the given resource type.
   */
  // Must be synchronized.
  void adjustResourceSubscription(XdsResourceType<?> resourceType) {
    if (isInBackoff()) {
      return;
    }
    if (adsStream == null) {
      startRpcStream();
    }
    Collection<String> resources = resourceStore.getSubscribedResources(serverInfo, resourceType);
    if (resources == null) {
      resources = Collections.emptyList();
    }
    adsStream.sendDiscoveryRequest(resourceType, resources);
    if (resources.isEmpty()) {
      // The resource type no longer has subscribing resources; clean up references to it
      versions.remove(resourceType);
      adsStream.respNonces.remove(resourceType);
    }
  }

  /**
   * Accepts the update for the given resource type by updating the latest resource version
   * and sends an ACK request to the management server.
   */
  // Must be synchronized.
  void ackResponse(XdsResourceType<?> type, String versionInfo, String nonce) {
    versions.put(type, versionInfo);
    logger.log(XdsLogLevel.INFO, "Sending ACK for {0} update, nonce: {1}, current version: {2}",
        type.typeName(), nonce, versionInfo);
    Collection<String> resources = resourceStore.getSubscribedResources(serverInfo, type);
    if (resources == null) {
      resources = Collections.emptyList();
    }
    adsStream.sendDiscoveryRequest(type, versionInfo, resources, nonce, null);
  }

  /**
   * Rejects the update for the given resource type and sends an NACK request (request with last
   * accepted version) to the management server.
   */
  // Must be synchronized.
  void nackResponse(XdsResourceType<?> type, String nonce, String errorDetail) {
    String versionInfo = versions.getOrDefault(type, "");
    logger.log(XdsLogLevel.INFO, "Sending NACK for {0} update, nonce: {1}, current version: {2}",
        type.typeName(), nonce, versionInfo);
    Collection<String> resources = resourceStore.getSubscribedResources(serverInfo, type);
    if (resources == null) {
      resources = Collections.emptyList();
    }
    adsStream.sendDiscoveryRequest(type, versionInfo, resources, nonce, errorDetail);
  }

  /**
   * Returns {@code true} if the resource discovery is currently in backoff.
   */
  // Must be synchronized.
  boolean isInBackoff() {
    return rpcRetryTimer != null && rpcRetryTimer.isPending();
  }

  // Must be synchronized.
  boolean isReady() {
    return adsStream != null && adsStream.call != null && adsStream.call.isReady();
  }

  /**
   * Starts a timer for each requested resource that hasn't been responded to and
   * has been waiting for the channel to get ready.
   */
  // Must be synchronized.
  void readyHandler() {
    if (!isReady()) {
      return;
    }

    if (isInBackoff()) {
      rpcRetryTimer.cancel();
      rpcRetryTimer = null;
    }

    xdsClient.startSubscriberTimersIfNeeded(serverInfo);
  }

  /**
   * Establishes the RPC connection by creating a new RPC stream on the given channel for
   * xDS protocol communication.
   */
  // Must be synchronized.
  private void startRpcStream() {
    checkState(adsStream == null, "Previous adsStream has not been cleared yet");
    adsStream = new AdsStream();
    logger.log(XdsLogLevel.INFO, "ADS stream started");
    stopwatch.reset().start();
  }

  @VisibleForTesting
  public final class RpcRetryTask implements Runnable {
    @Override
    public void run() {
      if (shutdown) {
        return;
      }
      startRpcStream();
      Set<XdsResourceType<?>> subscribedResourceTypes =
          new HashSet<>(resourceStore.getSubscribedResourceTypesWithTypeUrl().values());
      for (XdsResourceType<?> type : subscribedResourceTypes) {
        Collection<String> resources = resourceStore.getSubscribedResources(serverInfo, type);
        if (resources != null) {
          adsStream.sendDiscoveryRequest(type, resources);
        }
      }
      xdsResponseHandler.handleStreamRestarted(serverInfo);
    }
  }

  @VisibleForTesting
  @Nullable
  XdsResourceType<?> fromTypeUrl(String typeUrl) {
    return resourceStore.getSubscribedResourceTypesWithTypeUrl().get(typeUrl);
  }

  private class AdsStream implements EventHandler<DiscoveryResponse> {
    private boolean responseReceived;
    private boolean closed;
    // Response nonce for the most recently received discovery responses of each resource type.
    // Client initiated requests start response nonce with empty string.
    // Nonce in each response is echoed back in the following ACK/NACK request. It is
    // used for management server to identify which response the client is ACKing/NACking.
    // To avoid confusion, client-initiated requests will always use the nonce in
    // most recently received responses of each resource type.
    private final Map<XdsResourceType<?>, String> respNonces = new HashMap<>();
    private final StreamingCall<DiscoveryRequest, DiscoveryResponse> call;
    private final MethodDescriptor<DiscoveryRequest, DiscoveryResponse> methodDescriptor =
        AggregatedDiscoveryServiceGrpc.getStreamAggregatedResourcesMethod();

    private AdsStream() {
      this.call = xdsTransport.createStreamingCall(methodDescriptor.getFullMethodName(),
          methodDescriptor.getRequestMarshaller(), methodDescriptor.getResponseMarshaller());
      call.start(this);
    }

    /**
     * Sends a discovery request with the given {@code versionInfo}, {@code nonce} and
     * {@code errorDetail}. Used for reacting to a specific discovery response. For
     * client-initiated discovery requests, use {@link
     * #sendDiscoveryRequest(XdsResourceType, Collection)}.
     */
    void sendDiscoveryRequest(XdsResourceType<?> type, String versionInfo,
                              Collection<String> resources, String nonce,
                              @Nullable String errorDetail) {
      DiscoveryRequest.Builder builder =
          DiscoveryRequest.newBuilder()
              .setVersionInfo(versionInfo)
              .setNode(bootstrapNode.toEnvoyProtoNode())
              .addAllResourceNames(resources)
              .setTypeUrl(type.typeUrl())
              .setResponseNonce(nonce);
      if (errorDetail != null) {
        com.google.rpc.Status error =
            com.google.rpc.Status.newBuilder()
                .setCode(Code.INVALID_ARGUMENT_VALUE)  // FIXME(chengyuanzhang): use correct code
                .setMessage(errorDetail)
                .build();
        builder.setErrorDetail(error);
      }
      DiscoveryRequest request = builder.build();
      call.sendMessage(request);
      if (logger.isLoggable(XdsLogLevel.DEBUG)) {
        logger.log(XdsLogLevel.DEBUG, "Sent DiscoveryRequest\n{0}", messagePrinter.print(request));
      }
    }

    /**
     * Sends a client-initiated discovery request.
     */
    final void sendDiscoveryRequest(XdsResourceType<?> type, Collection<String> resources) {
      logger.log(XdsLogLevel.INFO, "Sending {0} request for resources: {1}", type, resources);
      sendDiscoveryRequest(type, versions.getOrDefault(type, ""), resources,
          respNonces.getOrDefault(type, ""), null);
    }

    @Override
    public void onReady() {
      syncContext.execute(ControlPlaneClient.this::readyHandler);
    }

    @Override
    public void onRecvMessage(DiscoveryResponse response) {
      syncContext.execute(new Runnable() {
        @Override
        public void run() {
          XdsResourceType<?> type = fromTypeUrl(response.getTypeUrl());
          if (logger.isLoggable(XdsLogLevel.DEBUG)) {
            logger.log(
                XdsLogLevel.DEBUG, "Received {0} response:\n{1}", type,
                messagePrinter.print(response));
          }
          if (type == null) {
            logger.log(
                XdsLogLevel.WARNING,
                "Ignore an unknown type of DiscoveryResponse: {0}",
                response.getTypeUrl());

            call.startRecvMessage();
            return;
          }
          handleRpcResponse(type, response.getVersionInfo(), response.getResourcesList(),
              response.getNonce());
        }
      });
    }

    @Override
    public void onStatusReceived(final Status status) {
      syncContext.execute(() -> {
        handleRpcStreamClosed(status);
      });
    }

    final void handleRpcResponse(XdsResourceType<?> type, String versionInfo, List<Any> resources,
                                 String nonce) {
      checkNotNull(type, "type");
      if (closed) {
        return;
      }
      responseReceived = true;
      respNonces.put(type, nonce);
      ProcessingTracker processingTracker = new ProcessingTracker(
          () -> call.startRecvMessage(), syncContext);
      xdsResponseHandler.handleResourceResponse(type, serverInfo, versionInfo, resources, nonce,
          processingTracker);
      processingTracker.onComplete();
    }

    private void handleRpcStreamClosed(Status status) {
      if (closed) {
        return;
      }

      if (responseReceived || retryBackoffPolicy == null) {
        // Reset the backoff sequence if had received a response, or backoff sequence
        // has never been initialized.
        retryBackoffPolicy = backoffPolicyProvider.get();
      }
      // FakeClock in tests isn't thread-safe. Schedule the retry timer before notifying callbacks
      // to avoid TSAN races, since tests may wait until callbacks are called but then would run
      // concurrently with the stopwatch and schedule.
      long elapsed = stopwatch.elapsed(TimeUnit.NANOSECONDS);
      long delayNanos = Math.max(0, retryBackoffPolicy.nextBackoffNanos() - elapsed);
      rpcRetryTimer = syncContext.schedule(
          new RpcRetryTask(), delayNanos, TimeUnit.NANOSECONDS, timeService);

      Status newStatus = status;
      if (responseReceived) {
        // A closed ADS stream after a successful response is not considered an error. Servers may
        // close streams for various reasons during normal operation, such as load balancing or
        // underlying connection hitting its max connection age limit  (see gRFC A9).
        if (!status.isOk()) {
          newStatus = Status.OK;
          logger.log( XdsLogLevel.DEBUG, "ADS stream closed with error {0}: {1}. However, a "
              + "response was received, so this will not be treated as an error. Cause: {2}",
              status.getCode(), status.getDescription(), status.getCause());
        } else {
          logger.log(XdsLogLevel.DEBUG,
              "ADS stream closed by server after a response was received");
        }
      } else {
        // If the ADS stream is closed without ever having received a response from the server, then
        // the XdsClient should consider that a connectivity error (see gRFC A57).
        if (status.isOk()) {
          newStatus = Status.UNAVAILABLE.withDescription(
              "ADS stream closed with OK before receiving a response");
        }
        logger.log(
            XdsLogLevel.ERROR, "ADS stream failed with status {0}: {1}. Cause: {2}",
            newStatus.getCode(), newStatus.getDescription(), newStatus.getCause());
      }

      closed = true;
      xdsResponseHandler.handleStreamClosed(newStatus);
      cleanUp();

      logger.log(XdsLogLevel.INFO, "Retry ADS stream in {0} ns", delayNanos);
    }

    private void close(Exception error) {
      if (closed) {
        return;
      }
      closed = true;
      cleanUp();
      call.sendError(error);
    }

    private void cleanUp() {
      if (adsStream == this) {
        adsStream = null;
      }
    }
  }
}

1	/*
2	* Copyright 2020 The gRPC Authors
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* http://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16
17	package io.grpc.xds.client;
18
19	import static com.google.common.base.Preconditions.checkNotNull;
20	import static com.google.common.base.Preconditions.checkState;
21
22	import com.google.common.annotations.VisibleForTesting;
23	import com.google.common.base.Stopwatch;
24	import com.google.common.base.Supplier;
25	import com.google.protobuf.Any;
26	import com.google.rpc.Code;
27	import io.envoyproxy.envoy.service.discovery.v3.AggregatedDiscoveryServiceGrpc;
28	import io.envoyproxy.envoy.service.discovery.v3.DiscoveryRequest;
29	import io.envoyproxy.envoy.service.discovery.v3.DiscoveryResponse;
30	import io.grpc.InternalLogId;
31	import io.grpc.MethodDescriptor;
32	import io.grpc.Status;
33	import io.grpc.SynchronizationContext;
34	import io.grpc.SynchronizationContext.ScheduledHandle;
35	import io.grpc.internal.BackoffPolicy;
36	import io.grpc.xds.client.Bootstrapper.ServerInfo;
37	import io.grpc.xds.client.EnvoyProtoData.Node;
38	import io.grpc.xds.client.XdsClient.ProcessingTracker;
39	import io.grpc.xds.client.XdsClient.ResourceStore;
40	import io.grpc.xds.client.XdsClient.XdsResponseHandler;
41	import io.grpc.xds.client.XdsLogger.XdsLogLevel;
42	import io.grpc.xds.client.XdsTransportFactory.EventHandler;
43	import io.grpc.xds.client.XdsTransportFactory.StreamingCall;
44	import io.grpc.xds.client.XdsTransportFactory.XdsTransport;
45	import java.util.Collection;
46	import java.util.Collections;
47	import java.util.HashMap;
48	import java.util.HashSet;
49	import java.util.List;
50	import java.util.Map;
51	import java.util.Set;
52	import java.util.concurrent.ScheduledExecutorService;
53	import java.util.concurrent.TimeUnit;
54	import javax.annotation.Nullable;
55
56	/**
57	* Common base type for XdsClient implementations, which encapsulates the layer abstraction of
58	* the xDS RPC stream.
59	*/
60	final class ControlPlaneClient {
61
62	private final SynchronizationContext syncContext;
63	private final InternalLogId logId;
64	private final XdsLogger logger;
65	private final ServerInfo serverInfo;
66	private final XdsTransport xdsTransport;
67	private final XdsResponseHandler xdsResponseHandler;
68	private final ResourceStore resourceStore;
69	private final ScheduledExecutorService timeService;
70	private final BackoffPolicy.Provider backoffPolicyProvider;
71	private final Stopwatch stopwatch;
72	private final Node bootstrapNode;
73	private final XdsClient xdsClient;
74
75	// Last successfully applied version_info for each resource type. Starts with empty string.
76	// A version_info is used to update management server with client's most recent knowledge of
77	// resources.
78	private final Map<XdsResourceType<?>, String> versions = new HashMap<>();	1✔
79
80	private boolean shutdown;
81	@Nullable
82	private AdsStream adsStream;
83	@Nullable
84	private BackoffPolicy retryBackoffPolicy;
85	@Nullable
86	private ScheduledHandle rpcRetryTimer;
87	private MessagePrettyPrinter messagePrinter;
88
89	/** An entity that manages ADS RPCs over a single channel. */
90	ControlPlaneClient(
91	XdsTransport xdsTransport,
92	ServerInfo serverInfo,
93	Node bootstrapNode,
94	XdsResponseHandler xdsResponseHandler,
95	ResourceStore resourceStore,
96	ScheduledExecutorService
97	timeService,
98	SynchronizationContext syncContext,
99	BackoffPolicy.Provider backoffPolicyProvider,
100	Supplier<Stopwatch> stopwatchSupplier,
101	XdsClient xdsClient,
102	MessagePrettyPrinter messagePrinter) {	1✔
103	this.serverInfo = checkNotNull(serverInfo, "serverInfo");	1✔
104	this.xdsTransport = checkNotNull(xdsTransport, "xdsTransport");	1✔
105	this.xdsResponseHandler = checkNotNull(xdsResponseHandler, "xdsResponseHandler");	1✔
106	this.resourceStore = checkNotNull(resourceStore, "resourcesSubscriber");	1✔
107	this.bootstrapNode = checkNotNull(bootstrapNode, "bootstrapNode");	1✔
108	this.timeService = checkNotNull(timeService, "timeService");	1✔
109	this.syncContext = checkNotNull(syncContext, "syncContext");	1✔
110	this.backoffPolicyProvider = checkNotNull(backoffPolicyProvider, "backoffPolicyProvider");	1✔
111	this.xdsClient = checkNotNull(xdsClient, "xdsClient");	1✔
112	this.messagePrinter = checkNotNull(messagePrinter, "messagePrinter");	1✔
113	stopwatch = checkNotNull(stopwatchSupplier, "stopwatchSupplier").get();	1✔
114	logId = InternalLogId.allocate("xds-client", serverInfo.target());	1✔
115	logger = XdsLogger.withLogId(logId);	1✔
116	logger.log(XdsLogLevel.INFO, "Created");	1✔
117	}	1✔
118
119	void shutdown() {
120	syncContext.execute(new Runnable() {	1✔
121	@Override
122	public void run() {
123	shutdown = true;	1✔
124	logger.log(XdsLogLevel.INFO, "Shutting down");	1✔
125	if (adsStream != null) {	1✔
126	adsStream.close(Status.CANCELLED.withDescription("shutdown").asException());	1✔
127	}
128	if (rpcRetryTimer != null && rpcRetryTimer.isPending()) {	1✔
129	rpcRetryTimer.cancel();	1✔
130	}
131	xdsTransport.shutdown();	1✔
132	}	1✔
133	});
134	}	1✔
135
136	@Override
137	public String toString() {
138	return logId.toString();	×
139	}
140
141	/**
142	* Updates the resource subscription for the given resource type.
143	*/
144	// Must be synchronized.
145	void adjustResourceSubscription(XdsResourceType<?> resourceType) {
146	if (isInBackoff()) {	1✔
147	return;	1✔
148	}
149	if (adsStream == null) {	1✔
150	startRpcStream();	1✔
151	}
152	Collection<String> resources = resourceStore.getSubscribedResources(serverInfo, resourceType);	1✔
153	if (resources == null) {	1✔
154	resources = Collections.emptyList();	1✔
155	}
156	adsStream.sendDiscoveryRequest(resourceType, resources);	1✔
157	if (resources.isEmpty()) {	1✔
158	// The resource type no longer has subscribing resources; clean up references to it
159	versions.remove(resourceType);	1✔
160	adsStream.respNonces.remove(resourceType);	1✔
161	}
162	}	1✔
163
164	/**
165	* Accepts the update for the given resource type by updating the latest resource version
166	* and sends an ACK request to the management server.
167	*/
168	// Must be synchronized.
169	void ackResponse(XdsResourceType<?> type, String versionInfo, String nonce) {
170	versions.put(type, versionInfo);	1✔
171	logger.log(XdsLogLevel.INFO, "Sending ACK for {0} update, nonce: {1}, current version: {2}",	1✔
172	type.typeName(), nonce, versionInfo);	1✔
173	Collection<String> resources = resourceStore.getSubscribedResources(serverInfo, type);	1✔
174	if (resources == null) {	1✔
175	resources = Collections.emptyList();	×
176	}
177	adsStream.sendDiscoveryRequest(type, versionInfo, resources, nonce, null);	1✔
178	}	1✔
179
180	/**
181	* Rejects the update for the given resource type and sends an NACK request (request with last
182	* accepted version) to the management server.
183	*/
184	// Must be synchronized.
185	void nackResponse(XdsResourceType<?> type, String nonce, String errorDetail) {
186	String versionInfo = versions.getOrDefault(type, "");	1✔
187	logger.log(XdsLogLevel.INFO, "Sending NACK for {0} update, nonce: {1}, current version: {2}",	1✔
188	type.typeName(), nonce, versionInfo);	1✔
189	Collection<String> resources = resourceStore.getSubscribedResources(serverInfo, type);	1✔
190	if (resources == null) {	1✔
191	resources = Collections.emptyList();	×
192	}
193	adsStream.sendDiscoveryRequest(type, versionInfo, resources, nonce, errorDetail);	1✔
194	}	1✔
195
196	/**
197	* Returns {@code true} if the resource discovery is currently in backoff.
198	*/
199	// Must be synchronized.
200	boolean isInBackoff() {
201	return rpcRetryTimer != null && rpcRetryTimer.isPending();	1✔
202	}
203
204	// Must be synchronized.
205	boolean isReady() {
206	return adsStream != null && adsStream.call != null && adsStream.call.isReady();	1✔
207	}
208
209	/**
210	* Starts a timer for each requested resource that hasn't been responded to and
211	* has been waiting for the channel to get ready.
212	*/
213	// Must be synchronized.
214	void readyHandler() {
215	if (!isReady()) {	1✔
216	return;	1✔
217	}
218
219	if (isInBackoff()) {	1✔
220	rpcRetryTimer.cancel();	×
221	rpcRetryTimer = null;	×
222	}
223
224	xdsClient.startSubscriberTimersIfNeeded(serverInfo);	1✔
225	}	1✔
226
227	/**
228	* Establishes the RPC connection by creating a new RPC stream on the given channel for
229	* xDS protocol communication.
230	*/
231	// Must be synchronized.
232	private void startRpcStream() {
233	checkState(adsStream == null, "Previous adsStream has not been cleared yet");	1✔
234	adsStream = new AdsStream();	1✔
235	logger.log(XdsLogLevel.INFO, "ADS stream started");	1✔
236	stopwatch.reset().start();	1✔
237	}	1✔
238
239	@VisibleForTesting
240	public final class RpcRetryTask implements Runnable {	1✔
241	@Override
242	public void run() {
243	if (shutdown) {	1✔
244	return;	×
245	}
246	startRpcStream();	1✔
247	Set<XdsResourceType<?>> subscribedResourceTypes =	1✔
248	new HashSet<>(resourceStore.getSubscribedResourceTypesWithTypeUrl().values());	1✔
249	for (XdsResourceType<?> type : subscribedResourceTypes) {	1✔
250	Collection<String> resources = resourceStore.getSubscribedResources(serverInfo, type);	1✔
251	if (resources != null) {	1✔
252	adsStream.sendDiscoveryRequest(type, resources);	1✔
253	}
254	}	1✔
255	xdsResponseHandler.handleStreamRestarted(serverInfo);	1✔
256	}	1✔
257	}
258
259	@VisibleForTesting
260	@Nullable
261	XdsResourceType<?> fromTypeUrl(String typeUrl) {
262	return resourceStore.getSubscribedResourceTypesWithTypeUrl().get(typeUrl);	1✔
263	}
264
265	private class AdsStream implements EventHandler<DiscoveryResponse> {
266	private boolean responseReceived;
267	private boolean closed;
268	// Response nonce for the most recently received discovery responses of each resource type.
269	// Client initiated requests start response nonce with empty string.
270	// Nonce in each response is echoed back in the following ACK/NACK request. It is
271	// used for management server to identify which response the client is ACKing/NACking.
272	// To avoid confusion, client-initiated requests will always use the nonce in
273	// most recently received responses of each resource type.
274	private final Map<XdsResourceType<?>, String> respNonces = new HashMap<>();	1✔
275	private final StreamingCall<DiscoveryRequest, DiscoveryResponse> call;
276	private final MethodDescriptor<DiscoveryRequest, DiscoveryResponse> methodDescriptor =	1✔
277	AggregatedDiscoveryServiceGrpc.getStreamAggregatedResourcesMethod();	1✔
278
279	private AdsStream() {	1✔
280	this.call = xdsTransport.createStreamingCall(methodDescriptor.getFullMethodName(),	1✔
281	methodDescriptor.getRequestMarshaller(), methodDescriptor.getResponseMarshaller());	1✔
282	call.start(this);	1✔
283	}	1✔
284
285	/**
286	* Sends a discovery request with the given {@code versionInfo}, {@code nonce} and
287	* {@code errorDetail}. Used for reacting to a specific discovery response. For
288	* client-initiated discovery requests, use {@link
289	* #sendDiscoveryRequest(XdsResourceType, Collection)}.
290	*/
291	void sendDiscoveryRequest(XdsResourceType<?> type, String versionInfo,
292	Collection<String> resources, String nonce,
293	@Nullable String errorDetail) {
294	DiscoveryRequest.Builder builder =
295	DiscoveryRequest.newBuilder()	1✔
296	.setVersionInfo(versionInfo)	1✔
297	.setNode(bootstrapNode.toEnvoyProtoNode())	1✔
298	.addAllResourceNames(resources)	1✔
299	.setTypeUrl(type.typeUrl())	1✔
300	.setResponseNonce(nonce);	1✔
301	if (errorDetail != null) {	1✔
302	com.google.rpc.Status error =
303	com.google.rpc.Status.newBuilder()	1✔
304	.setCode(Code.INVALID_ARGUMENT_VALUE) // FIXME(chengyuanzhang): use correct code	1✔
305	.setMessage(errorDetail)	1✔
306	.build();	1✔
307	builder.setErrorDetail(error);	1✔
308	}
309	DiscoveryRequest request = builder.build();	1✔
310	call.sendMessage(request);	1✔
311	if (logger.isLoggable(XdsLogLevel.DEBUG)) {	1✔
312	logger.log(XdsLogLevel.DEBUG, "Sent DiscoveryRequest\n{0}", messagePrinter.print(request));	×
313	}
314	}	1✔
315
316	/**
317	* Sends a client-initiated discovery request.
318	*/
319	final void sendDiscoveryRequest(XdsResourceType<?> type, Collection<String> resources) {
320	logger.log(XdsLogLevel.INFO, "Sending {0} request for resources: {1}", type, resources);	1✔
321	sendDiscoveryRequest(type, versions.getOrDefault(type, ""), resources,	1✔
322	respNonces.getOrDefault(type, ""), null);	1✔
323	}	1✔
324
325	@Override
326	public void onReady() {
327	syncContext.execute(ControlPlaneClient.this::readyHandler);	1✔
328	}	1✔
329
330	@Override
331	public void onRecvMessage(DiscoveryResponse response) {
332	syncContext.execute(new Runnable() {	1✔
333	@Override
334	public void run() {
335	XdsResourceType<?> type = fromTypeUrl(response.getTypeUrl());	1✔
336	if (logger.isLoggable(XdsLogLevel.DEBUG)) {	1✔
337	logger.log(	×
338	XdsLogLevel.DEBUG, "Received {0} response:\n{1}", type,
339	messagePrinter.print(response));	×
340	}
341	if (type == null) {	1✔
342	logger.log(	1✔
343	XdsLogLevel.WARNING,
344	"Ignore an unknown type of DiscoveryResponse: {0}",
345	response.getTypeUrl());	1✔
346
347	call.startRecvMessage();	1✔
348	return;	1✔
349	}
350	handleRpcResponse(type, response.getVersionInfo(), response.getResourcesList(),	1✔
351	response.getNonce());	1✔
352	}	1✔
353	});
354	}	1✔
355
356	@Override
357	public void onStatusReceived(final Status status) {
358	syncContext.execute(() -> {	1✔
359	handleRpcStreamClosed(status);	1✔
360	});	1✔
361	}	1✔
362
363	final void handleRpcResponse(XdsResourceType<?> type, String versionInfo, List<Any> resources,
364	String nonce) {
365	checkNotNull(type, "type");	1✔
366	if (closed) {	1✔
367	return;	×
368	}
369	responseReceived = true;	1✔
370	respNonces.put(type, nonce);	1✔
371	ProcessingTracker processingTracker = new ProcessingTracker(	1✔
372	() -> call.startRecvMessage(), syncContext);	1✔
373	xdsResponseHandler.handleResourceResponse(type, serverInfo, versionInfo, resources, nonce,	1✔
374	processingTracker);
375	processingTracker.onComplete();	1✔
376	}	1✔
377
378	private void handleRpcStreamClosed(Status status) {
379	if (closed) {	1✔
380	return;	1✔
381	}
382
383	if (responseReceived \|\| retryBackoffPolicy == null) {	1✔
384	// Reset the backoff sequence if had received a response, or backoff sequence
385	// has never been initialized.
386	retryBackoffPolicy = backoffPolicyProvider.get();	1✔
387	}
388	// FakeClock in tests isn't thread-safe. Schedule the retry timer before notifying callbacks
389	// to avoid TSAN races, since tests may wait until callbacks are called but then would run
390	// concurrently with the stopwatch and schedule.
391	long elapsed = stopwatch.elapsed(TimeUnit.NANOSECONDS);	1✔
392	long delayNanos = Math.max(0, retryBackoffPolicy.nextBackoffNanos() - elapsed);	1✔
393	rpcRetryTimer = syncContext.schedule(	1✔
394	new RpcRetryTask(), delayNanos, TimeUnit.NANOSECONDS, timeService);	1✔
395
396	Status newStatus = status;	1✔
397	if (responseReceived) {	1✔
398	// A closed ADS stream after a successful response is not considered an error. Servers may
399	// close streams for various reasons during normal operation, such as load balancing or
400	// underlying connection hitting its max connection age limit (see gRFC A9).
401	if (!status.isOk()) {	1✔
402	newStatus = Status.OK;	1✔
403	logger.log( XdsLogLevel.DEBUG, "ADS stream closed with error {0}: {1}. However, a "	1✔
404	+ "response was received, so this will not be treated as an error. Cause: {2}",
405	status.getCode(), status.getDescription(), status.getCause());	1✔
406	} else {
407	logger.log(XdsLogLevel.DEBUG,	1✔
408	"ADS stream closed by server after a response was received");
409	}
410	} else {
411	// If the ADS stream is closed without ever having received a response from the server, then
412	// the XdsClient should consider that a connectivity error (see gRFC A57).
413	if (status.isOk()) {	1✔
414	newStatus = Status.UNAVAILABLE.withDescription(	1✔
415	"ADS stream closed with OK before receiving a response");
416	}
417	logger.log(	1✔
418	XdsLogLevel.ERROR, "ADS stream failed with status {0}: {1}. Cause: {2}",
419	newStatus.getCode(), newStatus.getDescription(), newStatus.getCause());	1✔
420	}
421
422	closed = true;	1✔
423	xdsResponseHandler.handleStreamClosed(newStatus);	1✔
424	cleanUp();	1✔
425
426	logger.log(XdsLogLevel.INFO, "Retry ADS stream in {0} ns", delayNanos);	1✔
427	}	1✔
428
429	private void close(Exception error) {
430	if (closed) {	1✔
431	return;	×
432	}
433	closed = true;	1✔
434	cleanUp();	1✔
435	call.sendError(error);	1✔
436	}	1✔
437
438	private void cleanUp() {
439	if (adsStream == this) {	1✔
440	adsStream = null;	1✔
441	}
442	}	1✔
443	}
444	}

grpc / grpc-java / #19572

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