OmniaGM commented on code in PR #15274: URL: https://github.com/apache/kafka/pull/15274#discussion_r1472771173
########## tools/src/main/java/org/apache/kafka/tools/consumer/ConsoleConsumer.java: ########## @@ -0,0 +1,233 @@ +/* + * 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.consumer; + +import java.io.PrintStream; +import java.time.Duration; +import java.util.HashMap; +import java.util.Iterator; +import java.util.Map; +import java.util.Optional; +import java.util.OptionalInt; +import java.util.OptionalLong; +import java.util.concurrent.CountDownLatch; +import java.util.regex.Pattern; +import java.util.Collections; +import org.apache.kafka.clients.consumer.Consumer; +import org.apache.kafka.clients.consumer.ConsumerRecord; +import org.apache.kafka.clients.consumer.KafkaConsumer; +import org.apache.kafka.common.MessageFormatter; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.errors.AuthenticationException; +import org.apache.kafka.common.errors.TimeoutException; +import org.apache.kafka.common.errors.WakeupException; +import org.apache.kafka.common.requests.ListOffsetsRequest; +import org.apache.kafka.common.serialization.ByteArrayDeserializer; +import org.apache.kafka.common.utils.Exit; +import org.apache.kafka.common.utils.Time; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +/** + * Consumer that dumps messages to standard out. + */ +class ConsoleConsumer { + + private static final Logger LOG = LoggerFactory.getLogger(ConsoleConsumer.class); + private static final CountDownLatch SHUTDOWN_LATCH = new CountDownLatch(1); + + static int messageCount = 0; + + public static void main(String[] args) throws Exception { + ConsoleConsumerOptions opts = new ConsoleConsumerOptions(args); + try { + run(opts); + } catch (AuthenticationException ae) { + LOG.error("Authentication failed: terminating consumer process", ae); + Exit.exit(1); + } catch (Throwable t) { + LOG.error("Unknown error when running consumer: ", t); + Exit.exit(1); + } + } + + static void run(ConsoleConsumerOptions conf) { + long timeoutMs = conf.timeoutMs() >= 0 ? conf.timeoutMs() : Long.MAX_VALUE; + Consumer<byte[], byte[]> consumer = new KafkaConsumer<>(conf.consumerProps(), new ByteArrayDeserializer(), new ByteArrayDeserializer()); + ConsumerWrapper consumerWrapper = conf.partitionArg().isPresent() + ? new ConsumerWrapper(Optional.of(conf.topicArg()), conf.partitionArg(), OptionalLong.of(conf.offsetArg()), Optional.empty(), consumer, timeoutMs) + : new ConsumerWrapper(Optional.of(conf.topicArg()), OptionalInt.empty(), OptionalLong.empty(), Optional.ofNullable(conf.includedTopicsArg()), consumer, timeoutMs); + + addShutdownHook(consumerWrapper, conf); + + try { + process(conf.maxMessages(), conf.formatter(), consumerWrapper, System.out, conf.skipMessageOnError()); + } finally { + consumerWrapper.cleanup(); + conf.formatter().close(); + reportRecordCount(); + + SHUTDOWN_LATCH.countDown(); + } + } + + static void addShutdownHook(ConsumerWrapper consumer, ConsoleConsumerOptions conf) { + Exit.addShutdownHook("consumer-shutdown-hook", () -> { + try { + consumer.wakeup(); + SHUTDOWN_LATCH.await(); + } catch (Throwable t) { + LOG.error("Exception while running shutdown hook " + t.getMessage()); + } + if (conf.enableSystestEventsLogging()) { + System.out.println("shutdown_complete"); + } + }); + } + + static void process(int maxMessages, MessageFormatter formatter, ConsumerWrapper consumer, PrintStream output, boolean skipMessageOnError) { + while (messageCount < maxMessages || maxMessages == -1) { + ConsumerRecord<byte[], byte[]> msg; + try { + msg = consumer.receive(); + } catch (WakeupException we) { + LOG.trace("Caught WakeupException because consumer is shutdown, ignore and terminate."); + // Consumer will be closed + return; + } catch (Throwable t) { + LOG.error("Error processing message, terminating consumer process: ", t); + // Consumer will be closed + return; + } + messageCount += 1; + try { + formatter.writeTo(new ConsumerRecord<>(msg.topic(), msg.partition(), msg.offset(), msg.timestamp(), msg.timestampType(), + 0, 0, msg.key(), msg.value(), msg.headers(), Optional.empty()), output); + } catch (Throwable t) { + if (skipMessageOnError) { + LOG.error("Error processing message, skipping this message: ", t); + } else { + // Consumer will be closed + throw t; + } + } + if (checkErr(output)) { + // Consumer will be closed + return; + } + } + } + + static void reportRecordCount() { + System.err.println("Processed a total of " + messageCount + " messages"); + } + + static boolean checkErr(PrintStream output) { + boolean gotError = output.checkError(); + if (gotError) { + // This means no one is listening to our output stream anymore, time to shut down + System.err.println("Unable to write to standard out, closing consumer."); + } + return gotError; + } + + public static class ConsumerWrapper { + final Optional<String> topic; + final OptionalInt partitionId; + final OptionalLong offset; + final Optional<String> includedTopics; + final Consumer<byte[], byte[]> consumer; + final long timeoutMs; + final Time time = Time.SYSTEM; + + Iterator<ConsumerRecord<byte[], byte[]>> recordIter = Collections.emptyIterator(); + + public ConsumerWrapper(Optional<String> topic, + OptionalInt partitionId, + OptionalLong offset, + Optional<String> includedTopics, + Consumer<byte[], byte[]> consumer, + long timeoutMs) { + this.topic = topic; + this.partitionId = partitionId; + this.offset = offset; + this.includedTopics = includedTopics; + this.consumer = consumer; + this.timeoutMs = timeoutMs; + + if (topic.isPresent() && partitionId.isPresent() && offset.isPresent() && !includedTopics.isPresent()) { + seek(topic.get(), partitionId.getAsInt(), offset.getAsLong()); + } else if (topic.isPresent() && partitionId.isPresent() && !offset.isPresent() && !includedTopics.isPresent()) { + // default to latest if no offset is provided + seek(topic.get(), partitionId.getAsInt(), ListOffsetsRequest.LATEST_TIMESTAMP); Review Comment: can't we use `ConsoleConsumerOptions.parseOffset` to either grab the given offset or the default instead of these 2 ifs? 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