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Posted to commits@pulsar.apache.org by GitBox <gi...@apache.org> on 2022/06/15 12:46:01 UTC
[GitHub] [pulsar] codelipenghui commented on a diff in pull request #16062: [feat][broker] PIP-145: Notifications for faster topic discovery
codelipenghui commented on code in PR #16062:
URL: https://github.com/apache/pulsar/pull/16062#discussion_r897882350
##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/PulsarClientImpl.java:
##########
@@ -119,9 +119,11 @@ public enum State {
// These sets are updated from multiple threads, so they require a threadsafe data structure
private final Set<ProducerBase<?>> producers = Collections.newSetFromMap(new ConcurrentHashMap<>());
private final Set<ConsumerBase<?>> consumers = Collections.newSetFromMap(new ConcurrentHashMap<>());
+ private final Set<TopicListWatcher> topicListWatchers = Collections.newSetFromMap(new ConcurrentHashMap<>());
Review Comment:
Looks like no one add watchers to this Set?
##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/ClientCnx.java:
##########
@@ -1036,6 +1053,62 @@ private TransactionBufferHandler checkAndGetTransactionBufferHandler() {
return transactionBufferHandler;
}
+ public CompletableFuture<CommandWatchTopicListSuccess> newWatchTopicList(
+ BaseCommand commandWatchTopicList, long requestId) {
+ if (!supportsTopicWatchers) {
+ return FutureUtil.failedFuture(
+ new PulsarClientException.NotAllowedException(
+ "Broker does not allow broker side pattern evaluation."));
+ }
+ return sendRequestAndHandleTimeout(Commands.serializeWithSize(commandWatchTopicList), requestId,
+ RequestType.Command, true);
+ }
+
+ public CompletableFuture<CommandWatchTopicListSuccess> newUnwatchTopicList(
+ BaseCommand commandUnwatchTopicList, long requestId) {
+ if (!supportsTopicWatchers) {
+ return FutureUtil.failedFuture(
+ new PulsarClientException.NotAllowedException(
+ "Broker does not allow broker side pattern evaluation."));
+ }
+ return sendRequestAndHandleTimeout(Commands.serializeWithSize(commandUnwatchTopicList), requestId,
+ RequestType.Command, true);
+ }
Review Comment:
Looks this method is unused. The TopicListWatcher uses `Commands.newUnwatchTopicList` directly.
##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/TopicListService.java:
##########
@@ -0,0 +1,254 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.pulsar.broker.service;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Semaphore;
+import java.util.function.BiConsumer;
+import java.util.regex.Pattern;
+import org.apache.pulsar.broker.PulsarService;
+import org.apache.pulsar.broker.namespace.NamespaceService;
+import org.apache.pulsar.broker.resources.TopicResources;
+import org.apache.pulsar.common.api.proto.CommandUnwatchTopicList;
+import org.apache.pulsar.common.api.proto.CommandWatchTopicList;
+import org.apache.pulsar.common.api.proto.ServerError;
+import org.apache.pulsar.common.naming.NamespaceName;
+import org.apache.pulsar.common.topics.TopicList;
+import org.apache.pulsar.common.util.collections.ConcurrentLongHashMap;
+import org.apache.pulsar.metadata.api.NotificationType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class TopicListService {
+
+
+ public static class TopicListWatcher implements BiConsumer<String, NotificationType> {
+
+ private final List<String> matchingTopics;
+ private final TopicListService topicListService;
+ private final long id;
+ private final Pattern topicsPattern;
+
+ public TopicListWatcher(TopicListService topicListService, long id,
+ Pattern topicsPattern, List<String> topics) {
+ this.topicListService = topicListService;
+ this.id = id;
+ this.topicsPattern = topicsPattern;
+ this.matchingTopics = TopicList.filterTopics(topics, topicsPattern);
+ }
+
+ public List<String> getMatchingTopics() {
+ return matchingTopics;
+ }
+
+ @Override
+ public void accept(String topicName, NotificationType notificationType) {
+ if (topicsPattern.matcher(topicName).matches()) {
+ List<String> newTopics;
+ List<String> deletedTopics;
+ if (notificationType == NotificationType.Deleted) {
+ newTopics = Collections.emptyList();
+ deletedTopics = Collections.singletonList(topicName);
+ matchingTopics.remove(topicName);
+ } else {
+ deletedTopics = Collections.emptyList();
+ newTopics = Collections.singletonList(topicName);
+ matchingTopics.add(topicName);
+ }
+ String hash = TopicList.calculateHash(matchingTopics);
+ topicListService.sendTopicListUpdate(id, hash, deletedTopics, newTopics);
+ }
+ }
+ }
+
+
+ private static final Logger log = LoggerFactory.getLogger(TopicListService.class);
+
+ private final NamespaceService namespaceService;
+ private final TopicResources topicResources;
+ private final ServerCnx connection;
+ private final boolean enableSubscriptionPatternEvaluation;
+ private final int maxSubscriptionPatternLength;
+ private final ConcurrentLongHashMap<CompletableFuture<TopicListWatcher>> watchers;
+
+
+ public TopicListService(PulsarService pulsar, ServerCnx connection,
+ boolean enableSubscriptionPatternEvaluation, int maxSubscriptionPatternLength) {
+ this.namespaceService = pulsar.getNamespaceService();
+ this.connection = connection;
+ this.enableSubscriptionPatternEvaluation = enableSubscriptionPatternEvaluation;
+ this.maxSubscriptionPatternLength = maxSubscriptionPatternLength;
+ this.watchers = ConcurrentLongHashMap.<CompletableFuture<TopicListWatcher>>newBuilder()
+ .expectedItems(8)
+ .concurrencyLevel(1)
+ .build();
+ this.topicResources = pulsar.getPulsarResources().getTopicResources();
+ }
+
+ public void inactivate() {
+ for (Long watcherId : new HashSet<>(watchers.keys())) {
+ deleteTopicListWatcher(watcherId);
+ }
+ }
+
+ public void handleWatchTopicList(CommandWatchTopicList commandWatchTopicList, Semaphore lookupSemaphore) {
+ String namespace = commandWatchTopicList.getNamespace();
+ NamespaceName namespaceName = NamespaceName.get(namespace);
+ long watcherId = commandWatchTopicList.getWatcherId();
+ long requestId = commandWatchTopicList.getRequestId();
+
+ Pattern topicsPattern = Pattern.compile(commandWatchTopicList.hasTopicsPattern()
+ ? commandWatchTopicList.getTopicsPattern() : TopicList.ALL_TOPICS_PATTERN);
+ if (!enableSubscriptionPatternEvaluation || topicsPattern.pattern().length() > maxSubscriptionPatternLength) {
+ String msg = "Unable to create topic list watcher: ";
+ if (!enableSubscriptionPatternEvaluation) {
+ msg += "Evaluating subscription patterns is disabled.";
+ } else {
+ msg += "Pattern longer than maximum: " + maxSubscriptionPatternLength;
+ }
+ log.warn("[{}] {} on namespace {}", connection.getRemoteAddress(), msg, namespaceName);
+ connection.getCommandSender().sendErrorResponse(requestId, ServerError.NotAllowedError, msg);
+ lookupSemaphore.release();
+ return;
+ }
+ CompletableFuture<TopicListWatcher> watcherFuture = new CompletableFuture<>();
+ CompletableFuture<TopicListWatcher> existingWatcherFuture = watchers.putIfAbsent(watcherId, watcherFuture);
+
+ if (existingWatcherFuture != null) {
+ if (existingWatcherFuture.isDone() && !existingWatcherFuture.isCompletedExceptionally()) {
+ TopicListWatcher watcher = existingWatcherFuture.getNow(null);
+ log.info("[{}] Watcher with the same id is already created:"
+ + " watcherId={}, watcher={}",
+ connection.getRemoteAddress(), watcherId, watcher);
+ watcherFuture = existingWatcherFuture;
+ } else {
+ // There was an early request to create a watcher with the same watcherId. This can happen when
+ // client timeout is lower the broker timeouts. We need to wait until the previous watcher
+ // creation request either completes or fails.
+ log.warn("[{}] Watcher with id is already present on the connection,"
+ + " consumerId={}", connection.getRemoteAddress(), watcherId);
+ ServerError error;
+ if (!existingWatcherFuture.isDone()) {
+ error = ServerError.ServiceNotReady;
+ } else {
+ error = ServerError.UnknownError;
+ watchers.remove(watcherId, existingWatcherFuture);
+ }
+ connection.getCommandSender().sendErrorResponse(requestId, error,
+ "Topic list watcher is already present on the connection");
+ lookupSemaphore.release();
+ return;
+ }
+ } else {
+ initializeTopicsListWatcher(watcherFuture, namespaceName, watcherId, topicsPattern);
+ }
+
+
+ watcherFuture.thenAccept(watcher -> {
+ List<String> topicList = watcher.getMatchingTopics();
+ String hash = TopicList.calculateHash(topicList);
+ if (commandWatchTopicList.hasTopicsHash()
+ && hash.equals(commandWatchTopicList.getTopicsHash())) {
+ topicList = Collections.emptyList();
+ }
+ if (log.isDebugEnabled()) {
+ log.debug(
+ "[{}] Received WatchTopicList for namespace [//{}] by {}",
+ connection.getRemoteAddress(), namespace, requestId);
+ }
+ connection.getCommandSender().sendWatchTopicListSuccess(requestId, watcherId, hash, topicList);
+ lookupSemaphore.release();
+ })
+ .exceptionally(ex -> {
+ log.warn("[{}] Error WatchTopicList for namespace [//{}] by {}",
+ connection.getRemoteAddress(), namespace, requestId);
+ connection.getCommandSender().sendErrorResponse(requestId,
+ BrokerServiceException.getClientErrorCode(
+ new BrokerServiceException.ServerMetadataException(ex)), ex.getMessage());
+ lookupSemaphore.release();
+ return null;
+ });
+ }
+
+
+ public void initializeTopicsListWatcher(CompletableFuture<TopicListWatcher> watcherFuture,
+ NamespaceName namespace, long watcherId, Pattern topicsPattern) {
+ namespaceService.getListOfPersistentTopics(namespace).
+ thenApply(topics -> {
+ TopicListWatcher watcher = new TopicListWatcher(this, watcherId, topicsPattern, topics);
+ topicResources.registerPersistentTopicListener(namespace, watcher);
+ return watcher;
+ }).
+ whenComplete((watcher, exception) -> {
+ if (exception != null) {
+ watcherFuture.completeExceptionally(exception);
+ } else {
+ watcherFuture.complete(watcher);
+ }
+ });
+ }
+
+
+ public void handleUnwatchTopicList(CommandUnwatchTopicList commandUnwatchTopicList) {
+ long requestId = commandUnwatchTopicList.getRequestId();
+ long watcherId = commandUnwatchTopicList.getWatcherId();
+ deleteTopicListWatcher(watcherId);
+ connection.getCommandSender().sendWatchTopicListSuccess(requestId, watcherId, null, null);
+ }
+
+ public void deleteTopicListWatcher(Long watcherId) {
+ CompletableFuture<TopicListWatcher> watcherFuture = watchers.get(watcherId);
+ if (watcherFuture == null) {
+ log.info("[{}] TopicListWatcher was not registered on the connection: {}",
+ watcherId, connection.getRemoteAddress());
+ return;
+ }
+
+ if (!watcherFuture.isDone() && watcherFuture
+ .completeExceptionally(new IllegalStateException("Closed watcher before creation was complete"))) {
+ // We have received a request to close the watcher before it was actually completed, we have marked the
+ // watcher future as failed and we can tell the client the close operation was successful. When the actual
+ // create operation will complete, the new watcher will be discarded.
+ log.info("[{}] Closed watcher before its creation was completed. watcherId={}",
+ connection.getRemoteAddress(), watcherId);
+ return;
Review Comment:
Any reason that doesn't remove from the watchers map if reach here?
##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/TopicListWatcher.java:
##########
@@ -0,0 +1,287 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.pulsar.client.impl;
+
+import io.netty.channel.ChannelHandlerContext;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLongFieldUpdater;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.regex.Pattern;
+import org.apache.pulsar.client.api.PulsarClientException;
+import org.apache.pulsar.common.api.proto.BaseCommand;
+import org.apache.pulsar.common.api.proto.CommandWatchTopicUpdate;
+import org.apache.pulsar.common.naming.NamespaceName;
+import org.apache.pulsar.common.protocol.Commands;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class TopicListWatcher extends HandlerState implements ConnectionHandler.Connection {
+
+ private static final Logger log = LoggerFactory.getLogger(TopicListWatcher.class);
+
+ private static final AtomicLongFieldUpdater<TopicListWatcher> CREATE_WATCHER_DEADLINE_UPDATER =
+ AtomicLongFieldUpdater
+ .newUpdater(TopicListWatcher.class, "createWatcherDeadline");
+
+ private final PatternMultiTopicsConsumerImpl.TopicsChangedListener topicsChangeListener;
+ private final String name;
+ private final ConnectionHandler connectionHandler;
+ private final Pattern topicsPattern;
+ private final long watcherId;
+ private volatile long createWatcherDeadline = 0;
+ private final NamespaceName namespace;
+ // TODO maintain the value based on updates from broker and warn the user if inconsistent with hash from polling
+ private String topicsHash;
+ private final CompletableFuture<TopicListWatcher> watcherFuture;
+
+ private final List<Throwable> previousExceptions = new CopyOnWriteArrayList<>();
+ private final AtomicReference<ClientCnx> clientCnxUsedForWatcherRegistration = new AtomicReference<>();
+
+
+ public TopicListWatcher(PatternMultiTopicsConsumerImpl.TopicsChangedListener topicsChangeListener,
+ PulsarClientImpl client, Pattern topicsPattern, long watcherId,
+ NamespaceName namespace, String topicsHash,
+ CompletableFuture<TopicListWatcher> watcherFuture) {
+ super(client, null);
+ this.topicsChangeListener = topicsChangeListener;
+ this.name = "Watcher(" + topicsPattern + ")";
+ this.connectionHandler = new ConnectionHandler(this,
+ new BackoffBuilder()
+ .setInitialTime(client.getConfiguration().getInitialBackoffIntervalNanos(),
+ TimeUnit.NANOSECONDS)
+ .setMax(client.getConfiguration().getMaxBackoffIntervalNanos(), TimeUnit.NANOSECONDS)
+ .setMandatoryStop(0, TimeUnit.MILLISECONDS)
+ .create(),
+ this);
+ this.topicsPattern = topicsPattern;
+ this.watcherId = watcherId;
+ this.namespace = namespace;
+ this.topicsHash = topicsHash;
+ this.watcherFuture = watcherFuture;
+
+ connectionHandler.grabCnx();
+ }
+
+ @Override
+ public void connectionFailed(PulsarClientException exception) {
+ boolean nonRetriableError = !PulsarClientException.isRetriableError(exception);
+ if (nonRetriableError) {
+ exception.setPreviousExceptions(previousExceptions);
+ if (watcherFuture.completeExceptionally(exception)) {
+ setState(State.Failed);
+ log.info("[{}] Watcher creation failed for {} with non-retriable error {}",
+ topic, name, exception);
+ deregisterFromClientCnx();
+ client.cleanupTopicListWatcher(this);
+ }
+ } else {
+ previousExceptions.add(exception);
+ }
+ }
+
+ @Override
+ public void connectionOpened(ClientCnx cnx) {
+ previousExceptions.clear();
+
+ if (getState() == State.Closing || getState() == State.Closed) {
+ setState(State.Closed);
+ deregisterFromClientCnx();
+ client.cleanupTopicListWatcher(this);
+ return;
+ }
+
+ log.info("[{}][{}] Creating topic list watcher on cnx {}, watcherId {}",
+ topic, getHandlerName(), cnx.ctx().channel(), watcherId);
+
+ long requestId = client.newRequestId();
+
+ CREATE_WATCHER_DEADLINE_UPDATER
+ .compareAndSet(this, 0L, System.currentTimeMillis()
+ + client.getConfiguration().getOperationTimeoutMs());
+
+ // synchronized this, because redeliverUnAckMessage eliminate the epoch inconsistency between them
+ synchronized (this) {
+ setClientCnx(cnx);
+ BaseCommand watchRequest = Commands.newWatchTopicList(requestId, watcherId, namespace.toString(),
+ topicsPattern.pattern(), topicsHash);
+
+ cnx.newWatchTopicList(watchRequest, requestId)
+
+ .thenAccept(response -> {
+ synchronized (TopicListWatcher.this) {
+ if (!changeToReadyState()) {
+ // Watcher was closed while reconnecting, close the connection to make sure the broker
+ // drops the watcher on its side
+ setState(State.Closed);
+ deregisterFromClientCnx();
+ client.cleanupTopicListWatcher(this);
+
+ cnx.channel().close();
+ return;
+ }
+ }
+
+ this.connectionHandler.resetBackoff();
+
+ watcherFuture.complete(this);
+
+ }).exceptionally((e) -> {
+ deregisterFromClientCnx();
+ if (getState() == State.Closing || getState() == State.Closed) {
+ // Watcher was closed while reconnecting, close the connection to make sure the broker
+ // drops the watcher on its side
+ cnx.channel().close();
+ return null;
+ }
+ log.warn("[{}][{}] Failed to subscribe to topic on {}", topic,
+ getHandlerName(), cnx.channel().remoteAddress());
+
+ if (e.getCause() instanceof PulsarClientException
+ && PulsarClientException.isRetriableError(e.getCause())
+ && System.currentTimeMillis()
+ < CREATE_WATCHER_DEADLINE_UPDATER.get(TopicListWatcher.this)) {
+ reconnectLater(e.getCause());
+ } else if (!watcherFuture.isDone()) {
+ // unable to create new watcher, fail operation
+ setState(State.Failed);
+ watcherFuture.completeExceptionally(
+ PulsarClientException.wrap(e, String.format("Failed to create topic list watcher %s"
+ + "when connecting to the broker", getHandlerName())));
+ client.cleanupTopicListWatcher(this);
Review Comment:
Should also cleanup the watcher from the `ClientCnx.topicListWatchers` since line:123 added the watcher to the `ClientCnx.topicListWatchers`
##########
pulsar-common/src/main/java/org/apache/pulsar/common/protocol/Commands.java:
##########
@@ -1474,6 +1477,55 @@ public static ByteBuf newEndTxnOnSubscriptionResponse(long requestId, long txnId
return serializeWithSize(cmd);
}
+ public static BaseCommand newWatchTopicList(
+ long requestId, long watcherId, String namespace, String topicsPattern, String topicsHash) {
+ BaseCommand cmd = localCmd(Type.WATCH_TOPIC_LIST);
+ cmd.setWatchTopicList()
+ .setRequestId(requestId)
+ .setNamespace(namespace)
Review Comment:
Can we make the namespace optional? Since we might support pattern subscribe without namespace/tenant. A related PR https://github.com/apache/pulsar/pull/7855
##########
pulsar-client/src/test/java/org/apache/pulsar/client/impl/ClientCnxTest.java:
##########
@@ -190,4 +196,106 @@ public void testHandleCloseProducer() {
eventLoop.shutdownGracefully();
}
+
+ @Test
+ public void testNoWatchersWhenNoServerSupport() {
+ withConnection("testNoWatchersWhenNoServerSupport", cnx -> {
+ cnx.handleConnected(new CommandConnected()
+ .setServerVersion("Some old Server")
+ .setProtocolVersion(1));
+
+ CompletableFuture<CommandWatchTopicListSuccess> result =
+ cnx.newWatchTopicList(Commands.newWatchTopicList(7, 5, "tenant/ns",
+ ".*", null), 7);
+ assertTrue(result.isCompletedExceptionally());
Review Comment:
Please also check the watcher is cleaned up if server does not support.
##########
pulsar-common/src/main/java/org/apache/pulsar/common/protocol/Commands.java:
##########
@@ -1474,6 +1477,55 @@ public static ByteBuf newEndTxnOnSubscriptionResponse(long requestId, long txnId
return serializeWithSize(cmd);
}
+ public static BaseCommand newWatchTopicList(
+ long requestId, long watcherId, String namespace, String topicsPattern, String topicsHash) {
+ BaseCommand cmd = localCmd(Type.WATCH_TOPIC_LIST);
+ cmd.setWatchTopicList()
+ .setRequestId(requestId)
+ .setNamespace(namespace)
Review Comment:
Or maybe better to have tenant and namespace, just keep them optional.
##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/TopicListService.java:
##########
@@ -0,0 +1,254 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.pulsar.broker.service;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Semaphore;
+import java.util.function.BiConsumer;
+import java.util.regex.Pattern;
+import org.apache.pulsar.broker.PulsarService;
+import org.apache.pulsar.broker.namespace.NamespaceService;
+import org.apache.pulsar.broker.resources.TopicResources;
+import org.apache.pulsar.common.api.proto.CommandUnwatchTopicList;
+import org.apache.pulsar.common.api.proto.CommandWatchTopicList;
+import org.apache.pulsar.common.api.proto.ServerError;
+import org.apache.pulsar.common.naming.NamespaceName;
+import org.apache.pulsar.common.topics.TopicList;
+import org.apache.pulsar.common.util.collections.ConcurrentLongHashMap;
+import org.apache.pulsar.metadata.api.NotificationType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class TopicListService {
+
+
+ public static class TopicListWatcher implements BiConsumer<String, NotificationType> {
+
+ private final List<String> matchingTopics;
+ private final TopicListService topicListService;
+ private final long id;
+ private final Pattern topicsPattern;
+
+ public TopicListWatcher(TopicListService topicListService, long id,
+ Pattern topicsPattern, List<String> topics) {
+ this.topicListService = topicListService;
+ this.id = id;
+ this.topicsPattern = topicsPattern;
+ this.matchingTopics = TopicList.filterTopics(topics, topicsPattern);
+ }
+
+ public List<String> getMatchingTopics() {
+ return matchingTopics;
+ }
+
+ @Override
+ public void accept(String topicName, NotificationType notificationType) {
+ if (topicsPattern.matcher(topicName).matches()) {
+ List<String> newTopics;
+ List<String> deletedTopics;
+ if (notificationType == NotificationType.Deleted) {
+ newTopics = Collections.emptyList();
+ deletedTopics = Collections.singletonList(topicName);
+ matchingTopics.remove(topicName);
+ } else {
+ deletedTopics = Collections.emptyList();
+ newTopics = Collections.singletonList(topicName);
+ matchingTopics.add(topicName);
+ }
+ String hash = TopicList.calculateHash(matchingTopics);
+ topicListService.sendTopicListUpdate(id, hash, deletedTopics, newTopics);
+ }
+ }
+ }
+
+
+ private static final Logger log = LoggerFactory.getLogger(TopicListService.class);
+
+ private final NamespaceService namespaceService;
+ private final TopicResources topicResources;
+ private final ServerCnx connection;
+ private final boolean enableSubscriptionPatternEvaluation;
+ private final int maxSubscriptionPatternLength;
+ private final ConcurrentLongHashMap<CompletableFuture<TopicListWatcher>> watchers;
+
+
+ public TopicListService(PulsarService pulsar, ServerCnx connection,
+ boolean enableSubscriptionPatternEvaluation, int maxSubscriptionPatternLength) {
+ this.namespaceService = pulsar.getNamespaceService();
+ this.connection = connection;
+ this.enableSubscriptionPatternEvaluation = enableSubscriptionPatternEvaluation;
+ this.maxSubscriptionPatternLength = maxSubscriptionPatternLength;
+ this.watchers = ConcurrentLongHashMap.<CompletableFuture<TopicListWatcher>>newBuilder()
+ .expectedItems(8)
+ .concurrencyLevel(1)
+ .build();
+ this.topicResources = pulsar.getPulsarResources().getTopicResources();
+ }
+
+ public void inactivate() {
+ for (Long watcherId : new HashSet<>(watchers.keys())) {
+ deleteTopicListWatcher(watcherId);
+ }
+ }
+
+ public void handleWatchTopicList(CommandWatchTopicList commandWatchTopicList, Semaphore lookupSemaphore) {
+ String namespace = commandWatchTopicList.getNamespace();
+ NamespaceName namespaceName = NamespaceName.get(namespace);
+ long watcherId = commandWatchTopicList.getWatcherId();
+ long requestId = commandWatchTopicList.getRequestId();
+
+ Pattern topicsPattern = Pattern.compile(commandWatchTopicList.hasTopicsPattern()
+ ? commandWatchTopicList.getTopicsPattern() : TopicList.ALL_TOPICS_PATTERN);
+ if (!enableSubscriptionPatternEvaluation || topicsPattern.pattern().length() > maxSubscriptionPatternLength) {
+ String msg = "Unable to create topic list watcher: ";
+ if (!enableSubscriptionPatternEvaluation) {
+ msg += "Evaluating subscription patterns is disabled.";
+ } else {
+ msg += "Pattern longer than maximum: " + maxSubscriptionPatternLength;
+ }
+ log.warn("[{}] {} on namespace {}", connection.getRemoteAddress(), msg, namespaceName);
+ connection.getCommandSender().sendErrorResponse(requestId, ServerError.NotAllowedError, msg);
+ lookupSemaphore.release();
+ return;
+ }
+ CompletableFuture<TopicListWatcher> watcherFuture = new CompletableFuture<>();
+ CompletableFuture<TopicListWatcher> existingWatcherFuture = watchers.putIfAbsent(watcherId, watcherFuture);
+
+ if (existingWatcherFuture != null) {
+ if (existingWatcherFuture.isDone() && !existingWatcherFuture.isCompletedExceptionally()) {
+ TopicListWatcher watcher = existingWatcherFuture.getNow(null);
+ log.info("[{}] Watcher with the same id is already created:"
+ + " watcherId={}, watcher={}",
+ connection.getRemoteAddress(), watcherId, watcher);
+ watcherFuture = existingWatcherFuture;
+ } else {
+ // There was an early request to create a watcher with the same watcherId. This can happen when
+ // client timeout is lower the broker timeouts. We need to wait until the previous watcher
+ // creation request either completes or fails.
+ log.warn("[{}] Watcher with id is already present on the connection,"
+ + " consumerId={}", connection.getRemoteAddress(), watcherId);
+ ServerError error;
+ if (!existingWatcherFuture.isDone()) {
+ error = ServerError.ServiceNotReady;
+ } else {
+ error = ServerError.UnknownError;
+ watchers.remove(watcherId, existingWatcherFuture);
+ }
+ connection.getCommandSender().sendErrorResponse(requestId, error,
+ "Topic list watcher is already present on the connection");
+ lookupSemaphore.release();
+ return;
+ }
+ } else {
+ initializeTopicsListWatcher(watcherFuture, namespaceName, watcherId, topicsPattern);
+ }
+
+
+ watcherFuture.thenAccept(watcher -> {
+ List<String> topicList = watcher.getMatchingTopics();
+ String hash = TopicList.calculateHash(topicList);
+ if (commandWatchTopicList.hasTopicsHash()
+ && hash.equals(commandWatchTopicList.getTopicsHash())) {
+ topicList = Collections.emptyList();
+ }
+ if (log.isDebugEnabled()) {
+ log.debug(
+ "[{}] Received WatchTopicList for namespace [//{}] by {}",
+ connection.getRemoteAddress(), namespace, requestId);
+ }
+ connection.getCommandSender().sendWatchTopicListSuccess(requestId, watcherId, hash, topicList);
+ lookupSemaphore.release();
+ })
+ .exceptionally(ex -> {
+ log.warn("[{}] Error WatchTopicList for namespace [//{}] by {}",
+ connection.getRemoteAddress(), namespace, requestId);
+ connection.getCommandSender().sendErrorResponse(requestId,
+ BrokerServiceException.getClientErrorCode(
+ new BrokerServiceException.ServerMetadataException(ex)), ex.getMessage());
+ lookupSemaphore.release();
+ return null;
+ });
+ }
+
+
+ public void initializeTopicsListWatcher(CompletableFuture<TopicListWatcher> watcherFuture,
+ NamespaceName namespace, long watcherId, Pattern topicsPattern) {
+ namespaceService.getListOfPersistentTopics(namespace).
+ thenApply(topics -> {
+ TopicListWatcher watcher = new TopicListWatcher(this, watcherId, topicsPattern, topics);
+ topicResources.registerPersistentTopicListener(namespace, watcher);
+ return watcher;
+ }).
+ whenComplete((watcher, exception) -> {
+ if (exception != null) {
+ watcherFuture.completeExceptionally(exception);
+ } else {
+ watcherFuture.complete(watcher);
+ }
+ });
+ }
+
+
+ public void handleUnwatchTopicList(CommandUnwatchTopicList commandUnwatchTopicList) {
+ long requestId = commandUnwatchTopicList.getRequestId();
+ long watcherId = commandUnwatchTopicList.getWatcherId();
+ deleteTopicListWatcher(watcherId);
+ connection.getCommandSender().sendWatchTopicListSuccess(requestId, watcherId, null, null);
+ }
+
+ public void deleteTopicListWatcher(Long watcherId) {
+ CompletableFuture<TopicListWatcher> watcherFuture = watchers.get(watcherId);
+ if (watcherFuture == null) {
+ log.info("[{}] TopicListWatcher was not registered on the connection: {}",
+ watcherId, connection.getRemoteAddress());
+ return;
+ }
+
+ if (!watcherFuture.isDone() && watcherFuture
+ .completeExceptionally(new IllegalStateException("Closed watcher before creation was complete"))) {
+ // We have received a request to close the watcher before it was actually completed, we have marked the
+ // watcher future as failed and we can tell the client the close operation was successful. When the actual
+ // create operation will complete, the new watcher will be discarded.
+ log.info("[{}] Closed watcher before its creation was completed. watcherId={}",
+ connection.getRemoteAddress(), watcherId);
+ return;
+ }
+
+ if (watcherFuture.isCompletedExceptionally()) {
+ log.info("[{}] Closed watcher that already failed to be created. watcherId={}",
+ connection.getRemoteAddress(), watcherId);
+ return;
Review Comment:
Same as the above comment.
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