juplo.de Git - demos/kafka/training/blob - src/test/java/de/juplo/kafka/ApplicationTests.java

   1 package de.juplo.kafka;
   2
   3 import lombok.extern.slf4j.Slf4j;
   4 import org.apache.kafka.clients.consumer.ConsumerRecord;
   5 import org.apache.kafka.clients.consumer.KafkaConsumer;
   6 import org.apache.kafka.clients.producer.KafkaProducer;
   7 import org.apache.kafka.clients.producer.ProducerRecord;
   8 import org.apache.kafka.common.TopicPartition;
   9 import org.apache.kafka.common.errors.RecordDeserializationException;
  10 import org.apache.kafka.common.serialization.*;
  11 import org.apache.kafka.common.utils.Bytes;
  12 import org.junit.jupiter.api.*;
  13 import org.springframework.beans.factory.annotation.Autowired;
  14 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
  15 import org.springframework.boot.test.autoconfigure.data.mongo.AutoConfigureDataMongo;
  16 import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer;
  17 import org.springframework.boot.test.context.TestConfiguration;
  18 import org.springframework.context.annotation.Bean;
  19 import org.springframework.context.annotation.Import;
  20 import org.springframework.kafka.test.context.EmbeddedKafka;
  21 import org.springframework.test.context.TestPropertySource;
  22 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  23
  24 import java.time.Duration;
  25 import java.util.*;
  26 import java.util.concurrent.ExecutionException;
  27 import java.util.concurrent.ExecutorService;
  28 import java.util.function.BiConsumer;
  29 import java.util.function.Consumer;
  30 import java.util.function.Function;
  31 import java.util.stream.Collectors;
  32 import java.util.stream.IntStream;
  33
  34 import static de.juplo.kafka.ApplicationTests.PARTITIONS;
  35 import static de.juplo.kafka.ApplicationTests.TOPIC;
  36 import static org.assertj.core.api.Assertions.*;
  37 import static org.awaitility.Awaitility.*;
  38
  39
  40 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  41 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  42 @TestPropertySource(
  43                 properties = {
  44                                 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
  45                                 "consumer.topic=" + TOPIC,
  46                                 "spring.mongodb.embedded.version=4.4.13" })
  47 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  48 @EnableAutoConfiguration
  49 @AutoConfigureDataMongo
  50 @Slf4j
  51 class ApplicationTests
  52 {
  53         public static final String TOPIC = "FOO";
  54         public static final int PARTITIONS = 10;
  55
  56
  57         StringSerializer stringSerializer = new StringSerializer();
  58
  59         @Autowired
  60         Serializer valueSerializer;
  61         @Autowired
  62         KafkaProducer<String, Bytes> kafkaProducer;
  63         @Autowired
  64         KafkaConsumer<String, Long> kafkaConsumer;
  65         @Autowired
  66         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  67         @Autowired
  68         ApplicationProperties properties;
  69         @Autowired
  70         ExecutorService executor;
  71         @Autowired
  72         PartitionStatisticsRepository repository;
  73
  74         Consumer<ConsumerRecord<String, Long>> testHandler;
  75         EndlessConsumer<String, Long> endlessConsumer;
  76         Map<TopicPartition, Long> oldOffsets;
  77         Map<TopicPartition, Long> newOffsets;
  78         Set<ConsumerRecord<String, Long>> receivedRecords;
  79
  80
  81         /** Tests methods */
  82
  83         @Test
  84         @Order(1) // << The poistion pill is not skipped. Hence, this test must run first
  85         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  86         {
  87                 send100Messages(i ->  new Bytes(valueSerializer.serialize(TOPIC, i)));
  88
  89                 await("100 records received")
  90                                 .atMost(Duration.ofSeconds(30))
  91                                 .until(() -> receivedRecords.size() >= 100);
  92
  93                 await("Offsets committed")
  94                                 .atMost(Duration.ofSeconds(10))
  95                                 .untilAsserted(() ->
  96                                 {
  97                                         checkSeenOffsetsForProgress();
  98                                         compareToCommitedOffsets(newOffsets);
  99                                 });
 100
 101                 assertThatExceptionOfType(IllegalStateException.class)
 102                                 .isThrownBy(() -> endlessConsumer.exitStatus())
 103                                 .describedAs("Consumer should still be running");
 104         }
 105
 106         @Test
 107         @Order(2)
 108         void commitsOffsetOfErrorForReprocessingOnError()
 109         {
 110                 send100Messages(counter ->
 111                                 counter == 77
 112                                                 ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
 113                                                 : new Bytes(valueSerializer.serialize(TOPIC, counter)));
 114
 115                 await("Consumer failed")
 116                                 .atMost(Duration.ofSeconds(30))
 117                                 .until(() -> !endlessConsumer.running());
 118
 119                 checkSeenOffsetsForProgress();
 120                 compareToCommitedOffsets(newOffsets);
 121
 122                 endlessConsumer.start();
 123                 await("Consumer failed")
 124                                 .atMost(Duration.ofSeconds(30))
 125                                 .until(() -> !endlessConsumer.running());
 126
 127                 checkSeenOffsetsForProgress();
 128                 compareToCommitedOffsets(newOffsets);
 129                 assertThat(receivedRecords.size())
 130                                 .describedAs("Received not all sent events")
 131                                 .isLessThan(100);
 132
 133                 assertThatNoException()
 134                                 .describedAs("Consumer should not be running")
 135                                 .isThrownBy(() -> endlessConsumer.exitStatus());
 136                 assertThat(endlessConsumer.exitStatus())
 137                                 .describedAs("Consumer should have exited abnormally")
 138                                 .containsInstanceOf(RecordDeserializationException.class);
 139         }
 140
 141
 142         /** Helper methods for the verification of expectations */
 143
 144         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 145         {
 146                 doForCurrentOffsets((tp, offset) ->
 147                 {
 148                         Long expected = offsetsToCheck.get(tp) + 1;
 149                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 150                         assertThat(offset)
 151                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 152                                         .isEqualTo(expected);
 153                 });
 154         }
 155
 156         void checkSeenOffsetsForProgress()
 157         {
 158                 // Be sure, that some messages were consumed...!
 159                 Set<TopicPartition> withProgress = new HashSet<>();
 160                 partitions().forEach(tp ->
 161                 {
 162                         Long oldOffset = oldOffsets.get(tp);
 163                         Long newOffset = newOffsets.get(tp);
 164                         if (!oldOffset.equals(newOffset))
 165                         {
 166                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 167                                 withProgress.add(tp);
 168                         }
 169                 });
 170                 assertThat(withProgress)
 171                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 172                                 .isNotEmpty();
 173         }
 174
 175
 176         /** Helper methods for setting up and running the tests */
 177
 178         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 179         {
 180                 offsetConsumer.assign(partitions());
 181                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 182                 offsetConsumer.unsubscribe();
 183         }
 184
 185         List<TopicPartition> partitions()
 186         {
 187                 return
 188                                 IntStream
 189                                                 .range(0, PARTITIONS)
 190                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 191                                                 .collect(Collectors.toList());
 192         }
 193
 194
 195         void send100Messages(Function<Long, Bytes> messageGenerator)
 196         {
 197                 long i = 0;
 198
 199                 for (int partition = 0; partition < 10; partition++)
 200                 {
 201                         for (int key = 0; key < 10; key++)
 202                         {
 203                                 Bytes value = messageGenerator.apply(++i);
 204
 205                                 ProducerRecord<String, Bytes> record =
 206                                                 new ProducerRecord<>(
 207                                                                 TOPIC,
 208                                                                 partition,
 209                                                                 Integer.toString(key%2),
 210                                                                 value);
 211
 212                                 kafkaProducer.send(record, (metadata, e) ->
 213                                 {
 214                                         if (metadata != null)
 215                                         {
 216                                                 log.debug(
 217                                                                 "{}|{} - {}={}",
 218                                                                 metadata.partition(),
 219                                                                 metadata.offset(),
 220                                                                 record.key(),
 221                                                                 record.value());
 222                                         }
 223                                         else
 224                                         {
 225                                                 log.warn(
 226                                                                 "Exception for {}={}: {}",
 227                                                                 record.key(),
 228                                                                 record.value(),
 229                                                                 e.toString());
 230                                         }
 231                                 });
 232                         }
 233                 }
 234         }
 235
 236
 237         @BeforeEach
 238         public void init()
 239         {
 240                 testHandler = record -> {} ;
 241
 242                 oldOffsets = new HashMap<>();
 243                 newOffsets = new HashMap<>();
 244                 receivedRecords = new HashSet<>();
 245
 246                 doForCurrentOffsets((tp, offset) ->
 247                 {
 248                         oldOffsets.put(tp, offset - 1);
 249                         newOffsets.put(tp, offset - 1);
 250                 });
 251
 252                 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
 253                                 record ->
 254                                 {
 255                                         newOffsets.put(
 256                                                         new TopicPartition(record.topic(), record.partition()),
 257                                                         record.offset());
 258                                         receivedRecords.add(record);
 259                                         testHandler.accept(record);
 260                                 };
 261
 262                 endlessConsumer =
 263                                 new EndlessConsumer<>(
 264                                                 executor,
 265                                                 repository,
 266                                                 properties.getClientId(),
 267                                                 properties.getTopic(),
 268                                                 kafkaConsumer,
 269                                                 captureOffsetAndExecuteTestHandler);
 270
 271                 endlessConsumer.start();
 272         }
 273
 274         @AfterEach
 275         public void deinit()
 276         {
 277                 try
 278                 {
 279                         endlessConsumer.stop();
 280                 }
 281                 catch (Exception e)
 282                 {
 283                         log.info("Exception while stopping the consumer: {}", e.toString());
 284                 }
 285         }
 286
 287
 288         @TestConfiguration
 289         @Import(ApplicationConfiguration.class)
 290         public static class Configuration
 291         {
 292                 @Bean
 293                 Serializer<Long> serializer()
 294                 {
 295                         return new LongSerializer();
 296                 }
 297
 298                 @Bean
 299                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 300                 {
 301                         Properties props = new Properties();
 302                         props.put("bootstrap.servers", properties.getBootstrapServer());
 303                         props.put("linger.ms", 100);
 304                         props.put("key.serializer", StringSerializer.class.getName());
 305                         props.put("value.serializer", BytesSerializer.class.getName());
 306
 307                         return new KafkaProducer<>(props);
 308                 }
 309
 310                 @Bean
 311                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 312                 {
 313                         Properties props = new Properties();
 314                         props.put("bootstrap.servers", properties.getBootstrapServer());
 315                         props.put("client.id", "OFFSET-CONSUMER");
 316                         props.put("group.id", properties.getGroupId());
 317                         props.put("key.deserializer", BytesDeserializer.class.getName());
 318                         props.put("value.deserializer", BytesDeserializer.class.getName());
 319
 320                         return new KafkaConsumer<>(props);
 321                 }
 322         }
 323 }