X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Ftest%2Fjava%2Fde%2Fjuplo%2Fkafka%2FApplicationTests.java;fp=src%2Ftest%2Fjava%2Fde%2Fjuplo%2Fkafka%2FApplicationTests.java;h=5b13b7d138a4791c3aab030f27bf3bd317511b1d;hb=de0468e4db973312e61ad4894edc092e84655161;hp=0000000000000000000000000000000000000000;hpb=66863e3169440f73ff450c7ba8ea4b9662b180e0;p=demos%2Fkafka%2Ftraining diff --git a/src/test/java/de/juplo/kafka/ApplicationTests.java b/src/test/java/de/juplo/kafka/ApplicationTests.java new file mode 100644 index 0000000..5b13b7d --- /dev/null +++ b/src/test/java/de/juplo/kafka/ApplicationTests.java @@ -0,0 +1,345 @@ +package de.juplo.kafka; + +import lombok.extern.slf4j.Slf4j; +import org.apache.kafka.clients.consumer.ConsumerRecord; +import org.apache.kafka.clients.consumer.KafkaConsumer; +import org.apache.kafka.clients.producer.KafkaProducer; +import org.apache.kafka.clients.producer.ProducerRecord; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.errors.RecordDeserializationException; +import org.apache.kafka.common.serialization.*; +import org.apache.kafka.common.utils.Bytes; +import org.junit.jupiter.api.*; +import org.springframework.beans.factory.annotation.Autowired; +import org.springframework.boot.autoconfigure.EnableAutoConfiguration; +import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer; +import org.springframework.boot.test.context.TestConfiguration; +import org.springframework.context.annotation.Bean; +import org.springframework.context.annotation.Import; +import org.springframework.kafka.test.context.EmbeddedKafka; +import org.springframework.test.context.TestPropertySource; +import org.springframework.test.context.junit.jupiter.SpringJUnitConfig; + +import java.time.Duration; +import java.util.*; +import java.util.concurrent.ExecutionException; +import java.util.concurrent.ExecutorService; +import java.util.function.BiConsumer; +import java.util.stream.Collectors; +import java.util.stream.IntStream; + +import static de.juplo.kafka.ApplicationTests.PARTITIONS; +import static de.juplo.kafka.ApplicationTests.TOPIC; +import static org.assertj.core.api.Assertions.*; +import static org.awaitility.Awaitility.*; + + +@SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class) +@TestMethodOrder(MethodOrderer.OrderAnnotation.class) +@TestPropertySource( + properties = { + "consumer.bootstrap-server=${spring.embedded.kafka.brokers}", + "consumer.topic=" + TOPIC, + "consumer.commit-interval=1s" }) +@EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS) +@EnableAutoConfiguration +@Slf4j +class ApplicationTests +{ + public static final String TOPIC = "FOO"; + public static final int PARTITIONS = 10; + + + StringSerializer stringSerializer = new StringSerializer(); + + @Autowired + Serializer valueSerializer; + @Autowired + KafkaProducer kafkaProducer; + @Autowired + KafkaConsumer kafkaConsumer; + @Autowired + KafkaConsumer offsetConsumer; + @Autowired + ApplicationProperties properties; + @Autowired + ExecutorService executor; + @Autowired + KeyCountingRebalanceListener keyCountingRebalanceListener; + @Autowired + KeyCountingRecordHandler keyCountingRecordHandler; + + EndlessConsumer endlessConsumer; + Map oldOffsets; + Map newOffsets; + Set> receivedRecords; + + + /** Tests methods */ + + @Test + void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException + { + send100Messages((partition, key, counter) -> + { + Bytes value = new Bytes(valueSerializer.serialize(TOPIC, counter)); + return new ProducerRecord<>(TOPIC, partition, key, value); + }); + + await("100 records received") + .atMost(Duration.ofSeconds(30)) + .pollInterval(Duration.ofSeconds(1)) + .until(() -> receivedRecords.size() >= 100); + + await("Offsets committed") + .atMost(Duration.ofSeconds(10)) + .pollInterval(Duration.ofSeconds(1)) + .untilAsserted(() -> + { + checkSeenOffsetsForProgress(); + compareToCommitedOffsets(newOffsets); + }); + + assertThatExceptionOfType(IllegalStateException.class) + .isThrownBy(() -> endlessConsumer.exitStatus()) + .describedAs("Consumer should still be running"); + } + + @Test + void commitsOffsetOfErrorForReprocessingOnDeserializationError() + { + send100Messages((partition, key, counter) -> + { + Bytes value = counter == 77 + ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!")) + : new Bytes(valueSerializer.serialize(TOPIC, counter)); + return new ProducerRecord<>(TOPIC, partition, key, value); + }); + + await("Consumer failed") + .atMost(Duration.ofSeconds(30)) + .pollInterval(Duration.ofSeconds(1)) + .until(() -> !endlessConsumer.running()); + + checkSeenOffsetsForProgress(); + compareToCommitedOffsets(newOffsets); + + endlessConsumer.start(); + await("Consumer failed") + .atMost(Duration.ofSeconds(30)) + .pollInterval(Duration.ofSeconds(1)) + .until(() -> !endlessConsumer.running()); + + checkSeenOffsetsForProgress(); + compareToCommitedOffsets(newOffsets); + assertThat(receivedRecords.size()) + .describedAs("Received not all sent events") + .isLessThan(100); + + assertThatNoException() + .describedAs("Consumer should not be running") + .isThrownBy(() -> endlessConsumer.exitStatus()); + assertThat(endlessConsumer.exitStatus()) + .describedAs("Consumer should have exited abnormally") + .containsInstanceOf(RecordDeserializationException.class); + } + + + /** Helper methods for the verification of expectations */ + + void compareToCommitedOffsets(Map offsetsToCheck) + { + doForCurrentOffsets((tp, offset) -> + { + Long expected = offsetsToCheck.get(tp) + 1; + log.debug("Checking, if the offset for {} is {}", tp, expected); + assertThat(offset) + .describedAs("Committed offset corresponds to the offset of the consumer") + .isEqualTo(expected); + }); + } + + void checkSeenOffsetsForProgress() + { + // Be sure, that some messages were consumed...! + Set withProgress = new HashSet<>(); + partitions().forEach(tp -> + { + Long oldOffset = oldOffsets.get(tp) + 1; + Long newOffset = newOffsets.get(tp) + 1; + if (!oldOffset.equals(newOffset)) + { + log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset); + withProgress.add(tp); + } + }); + assertThat(withProgress) + .describedAs("Some offsets must have changed, compared to the old offset-positions") + .isNotEmpty(); + } + + + /** Helper methods for setting up and running the tests */ + + void seekToEnd() + { + offsetConsumer.assign(partitions()); + offsetConsumer.seekToEnd(partitions()); + partitions().forEach(tp -> + { + // seekToEnd() works lazily: it only takes effect on poll()/position() + Long offset = offsetConsumer.position(tp); + log.info("New position for {}: {}", tp, offset); + }); + // The new positions must be commited! + offsetConsumer.commitSync(); + offsetConsumer.unsubscribe(); + } + + void doForCurrentOffsets(BiConsumer consumer) + { + offsetConsumer.assign(partitions()); + partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp))); + offsetConsumer.unsubscribe(); + } + + List partitions() + { + return + IntStream + .range(0, PARTITIONS) + .mapToObj(partition -> new TopicPartition(TOPIC, partition)) + .collect(Collectors.toList()); + } + + + public interface RecordGenerator + { + public ProducerRecord generate(int partition, String key, long counter); + } + + void send100Messages(RecordGenerator recordGenerator) + { + long i = 0; + + for (int partition = 0; partition < 10; partition++) + { + for (int key = 0; key < 10; key++) + { + ProducerRecord record = + recordGenerator.generate(partition, Integer.toString(partition*10+key%2), ++i); + + kafkaProducer.send(record, (metadata, e) -> + { + if (metadata != null) + { + log.debug( + "{}|{} - {}={}", + metadata.partition(), + metadata.offset(), + record.key(), + record.value()); + } + else + { + log.warn( + "Exception for {}={}: {}", + record.key(), + record.value(), + e.toString()); + } + }); + } + } + } + + + @BeforeEach + public void init() + { + seekToEnd(); + + oldOffsets = new HashMap<>(); + newOffsets = new HashMap<>(); + receivedRecords = new HashSet<>(); + + doForCurrentOffsets((tp, offset) -> + { + oldOffsets.put(tp, offset - 1); + newOffsets.put(tp, offset - 1); + }); + + TestRecordHandler captureOffsetAndExecuteTestHandler = + new TestRecordHandler(keyCountingRecordHandler) { + @Override + public void onNewRecord(ConsumerRecord record) + { + newOffsets.put( + new TopicPartition(record.topic(), record.partition()), + record.offset()); + receivedRecords.add(record); + } + }; + + endlessConsumer = + new EndlessConsumer<>( + executor, + properties.getClientId(), + properties.getTopic(), + kafkaConsumer, + keyCountingRebalanceListener, + captureOffsetAndExecuteTestHandler); + + endlessConsumer.start(); + } + + @AfterEach + public void deinit() + { + try + { + endlessConsumer.stop(); + } + catch (Exception e) + { + log.info("Exception while stopping the consumer: {}", e.toString()); + } + } + + + @TestConfiguration + @Import(ApplicationConfiguration.class) + public static class Configuration + { + @Bean + Serializer serializer() + { + return new LongSerializer(); + } + + @Bean + KafkaProducer kafkaProducer(ApplicationProperties properties) + { + Properties props = new Properties(); + props.put("bootstrap.servers", properties.getBootstrapServer()); + props.put("linger.ms", 100); + props.put("key.serializer", StringSerializer.class.getName()); + props.put("value.serializer", BytesSerializer.class.getName()); + + return new KafkaProducer<>(props); + } + + @Bean + KafkaConsumer offsetConsumer(ApplicationProperties properties) + { + Properties props = new Properties(); + props.put("bootstrap.servers", properties.getBootstrapServer()); + props.put("client.id", "OFFSET-CONSUMER"); + props.put("group.id", properties.getGroupId()); + props.put("key.deserializer", BytesDeserializer.class.getName()); + props.put("value.deserializer", BytesDeserializer.class.getName()); + + return new KafkaConsumer<>(props); + } + } +}