AndrewJSchofield commented on code in PR #17626: URL: https://github.com/apache/kafka/pull/17626#discussion_r1825888174
########## tools/src/main/java/org/apache/kafka/tools/GroupsCommand.java: ########## @@ -0,0 +1,295 @@ +/* + * 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.kafka.tools; + +import org.apache.kafka.clients.admin.Admin; +import org.apache.kafka.clients.admin.AdminClientConfig; +import org.apache.kafka.clients.admin.GroupListing; +import org.apache.kafka.common.GroupType; +import org.apache.kafka.common.utils.Exit; +import org.apache.kafka.common.utils.Utils; +import org.apache.kafka.server.util.CommandDefaultOptions; +import org.apache.kafka.server.util.CommandLineUtils; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collection; +import java.util.List; +import java.util.Optional; +import java.util.Properties; +import java.util.concurrent.ExecutionException; +import java.util.concurrent.TimeUnit; +import java.util.stream.Stream; + +import joptsimple.ArgumentAcceptingOptionSpec; +import joptsimple.OptionSpec; +import joptsimple.OptionSpecBuilder; + +public class GroupsCommand { + private static final Logger LOG = LoggerFactory.getLogger(GroupsCommand.class); + + public static void main(String... args) { + Exit.exit(mainNoExit(args)); + } + + static int mainNoExit(String... args) { + try { + execute(args); + return 0; + } catch (Throwable e) { + System.err.println(e.getMessage()); + System.err.println(Utils.stackTrace(e)); + return 1; + } + } + + static void execute(String... args) throws Exception { + GroupsCommandOptions opts = new GroupsCommandOptions(args); + + Properties config = opts.commandConfig(); + config.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, opts.bootstrapServer()); + + int exitCode = 0; + try (GroupsService service = new GroupsService(config)) { + if (opts.hasListOption()) { + service.listGroups(opts); + } + } catch (ExecutionException e) { + Throwable cause = e.getCause(); + if (cause != null) { + printException(cause); + } else { + printException(e); + } + exitCode = 1; + } catch (Throwable t) { + printException(t); + exitCode = 1; + } finally { + Exit.exit(exitCode); + } + } + + public static class GroupsService implements AutoCloseable { + private final Admin adminClient; + + public GroupsService(Properties config) { + this.adminClient = Admin.create(config); + } + + // Visible for testing + GroupsService(Admin adminClient) { + this.adminClient = adminClient; + } + + public void listGroups(GroupsCommandOptions opts) throws Exception { + Collection<GroupListing> resources = adminClient.listGroups() + .all().get(30, TimeUnit.SECONDS); + printGroupDetails(resources, opts.groupType(), opts.protocol(), opts.hasConsumerOption(), opts.hasShareOption()); + } + + private void printGroupDetails(Collection<GroupListing> groups, + Optional<GroupType> groupTypeFilter, + Optional<String> protocolFilter, + boolean consumerGroupFilter, + boolean shareGroupFilter) { + List<List<String>> lineItems = new ArrayList<>(); + int maxLen = 20; + for (GroupListing group : groups) { + if (combinedFilter(group, groupTypeFilter, protocolFilter, consumerGroupFilter, shareGroupFilter)) { + List<String> lineItem = new ArrayList<>(); + lineItem.add(group.groupId()); + lineItem.add(group.type().map(GroupType::toString).orElse("")); + lineItem.add(group.protocol()); + for (String item : lineItem) { + if (item != null) { + maxLen = Math.max(maxLen, item.length()); + } + } + lineItems.add(lineItem); + } + } + + String fmt = "%" + (-maxLen) + "s"; + String header = fmt + " " + fmt + " " + fmt; + System.out.printf(header, "GROUP", "TYPE", "PROTOCOL"); + System.out.println(); + for (List<String> item : lineItems) { + for (String atom : item) { + System.out.printf(fmt + " ", atom); + } + System.out.println(); + } + } + + private boolean combinedFilter(GroupListing group, + Optional<GroupType> groupTypeFilter, + Optional<String> protocolFilter, + boolean consumerGroupFilter, + boolean shareGroupFilter) { + boolean pass = true; + Optional<GroupType> groupType = group.type(); + String protocol = group.protocol(); + + if (groupTypeFilter.isPresent()) { + pass = protocolFilter.map(s -> protocol.equals(s) && groupType.filter(gt -> gt == groupTypeFilter.get()).isPresent()) + .orElseGet(() -> groupType.filter(gt -> gt == groupTypeFilter.get()).isPresent()); + } else if (protocolFilter.isPresent()) { + pass = protocol.equals(protocolFilter.get()); + } else if (consumerGroupFilter) { + pass = protocol.equals("consumer") || protocol.isEmpty() || groupType.filter(gt -> gt == GroupType.CONSUMER).isPresent(); + } else if (shareGroupFilter) { + pass = groupType.filter(gt -> gt == GroupType.SHARE).isPresent(); + } + return pass; + } + + @Override + public void close() throws Exception { + adminClient.close(); + } + } + + private static void printException(Throwable e) { + System.out.println("Error while executing groups command : " + e.getMessage()); + LOG.error(Utils.stackTrace(e)); + } + + public static final class GroupsCommandOptions extends CommandDefaultOptions { + private final ArgumentAcceptingOptionSpec<String> bootstrapServerOpt; + + private final ArgumentAcceptingOptionSpec<String> commandConfigOpt; + + private final OptionSpecBuilder listOpt; + + private final ArgumentAcceptingOptionSpec<String> groupTypeOpt; + + private final ArgumentAcceptingOptionSpec<String> protocolOpt; + + private final OptionSpecBuilder consumerOpt; + + private final OptionSpecBuilder shareOpt; + + public GroupsCommandOptions(String[] args) { + super(args); + bootstrapServerOpt = parser.accepts("bootstrap-server", "REQUIRED: The Kafka server to connect to.") + .withRequiredArg() + .describedAs("server to connect to") + .required() + .ofType(String.class); + commandConfigOpt = parser.accepts("command-config", "Property file containing configs to be passed to Admin Client.") + .withRequiredArg() + .describedAs("command config property file") + .ofType(String.class); + + listOpt = parser.accepts("list", "List the groups."); + + groupTypeOpt = parser.accepts("group-type", "Filter the groups based on group type. " + + "Valid types are: 'classic', 'consumer' and 'share'.") + .withRequiredArg() + .describedAs("type") + .ofType(String.class); + + protocolOpt = parser.accepts("protocol", "Filter the groups based on protocol type.") + .withRequiredArg() + .describedAs("protocol") + .ofType(String.class); + + consumerOpt = parser.accepts("consumer", "Filter the groups to show all kinds of consumer groups, including classic and simple consumer groups. " Review Comment: Yes. Here's the output for a distributed Kafka Connect cluster running one sink connector: ``` % bin/kafka-groups.sh --bootstrap-server localhost:9092 --list GROUP TYPE PROTOCOL connect-file Classic consumer connect-cluster Classic connect ``` The group `connect-cluster` is the Kafka Connect classic group which is used to coordinate the workers. The consumer group `connect-file` is used by the sink connector to consume records from Kafka. I expect if I configured my sink connector with `group.protocol=consumer` that the group `connect-file` would actually be group type Consumer. Either way, this one is a consumer group. I think there will be a new group type of connect before too long, but for now, it uses a classic group with protocol "connect". The fact that you can see this at all shows the value of the new tool :) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
