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

   1 package de.juplo.kafka;
   2
   3 import com.mongodb.client.MongoClient;
   4 import lombok.extern.slf4j.Slf4j;
   5 import org.apache.kafka.clients.consumer.ConsumerRecord;
   6 import org.apache.kafka.clients.consumer.KafkaConsumer;
   7 import org.apache.kafka.clients.producer.KafkaProducer;
   8 import org.apache.kafka.clients.producer.ProducerRecord;
   9 import org.apache.kafka.common.TopicPartition;
  10 import org.apache.kafka.common.errors.RecordDeserializationException;
  11 import org.apache.kafka.common.serialization.*;
  12 import org.apache.kafka.common.utils.Bytes;
  13 import org.junit.jupiter.api.*;
  14 import org.springframework.beans.factory.annotation.Autowired;
  15 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
  16 import org.springframework.boot.autoconfigure.mongo.MongoProperties;
  17 import org.springframework.boot.test.autoconfigure.data.mongo.AutoConfigureDataMongo;
  18 import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer;
  19 import org.springframework.boot.test.context.TestConfiguration;
  20 import org.springframework.context.annotation.Import;
  21 import org.springframework.kafka.test.context.EmbeddedKafka;
  22 import org.springframework.test.context.TestPropertySource;
  23 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  24
  25 import java.time.Duration;
  26 import java.util.*;
  27 import java.util.concurrent.ExecutorService;
  28 import java.util.function.BiConsumer;
  29 import java.util.function.Consumer;
  30 import java.util.stream.Collectors;
  31 import java.util.stream.IntStream;
  32
  33 import static de.juplo.kafka.GenericApplicationTests.PARTITIONS;
  34 import static de.juplo.kafka.GenericApplicationTests.TOPIC;
  35 import static org.assertj.core.api.Assertions.*;
  36 import static org.awaitility.Awaitility.*;
  37
  38
  39 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  40 @TestPropertySource(
  41                 properties = {
  42                                 "sumup.adder.bootstrap-server=${spring.embedded.kafka.brokers}",
  43                                 "sumup.adder.topic=" + TOPIC,
  44                                 "sumup.adder.commit-interval=500ms",
  45                                 "spring.mongodb.embedded.version=4.4.13" })
  46 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  47 @EnableAutoConfiguration
  48 @AutoConfigureDataMongo
  49 @Slf4j
  50 abstract class GenericApplicationTests<K, V>
  51 {
  52         public static final String TOPIC = "FOO";
  53         public static final int PARTITIONS = 10;
  54
  55
  56         @Autowired
  57         KafkaConsumer<K, V> kafkaConsumer;
  58         @Autowired
  59         Consumer<ConsumerRecord<K, V>> consumer;
  60         @Autowired
  61         ApplicationProperties properties;
  62         @Autowired
  63         ExecutorService executor;
  64         @Autowired
  65         MongoClient mongoClient;
  66         @Autowired
  67         MongoProperties mongoProperties;
  68         @Autowired
  69         RebalanceListener rebalanceListener;
  70         @Autowired
  71         RecordHandler<K, V> recordHandler;
  72
  73         KafkaProducer<Bytes, Bytes> testRecordProducer;
  74         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  75         EndlessConsumer<K, V> endlessConsumer;
  76         Map<TopicPartition, Long> oldOffsets;
  77         Map<TopicPartition, Long> seenOffsets;
  78         Set<ConsumerRecord<K, V>> receivedRecords;
  79
  80
  81         final RecordGenerator recordGenerator;
  82         final Consumer<ProducerRecord<Bytes, Bytes>> messageSender;
  83
  84         public GenericApplicationTests(RecordGenerator recordGenerator)
  85         {
  86                 this.recordGenerator = recordGenerator;
  87                 this.messageSender = (record) -> sendMessage(record);
  88         }
  89
  90
  91         /** Tests methods */
  92
  93         @Test
  94         void commitsCurrentOffsetsOnSuccess() throws Exception
  95         {
  96                 int numberOfGeneratedMessages =
  97                                 recordGenerator.generate(false, false, messageSender);
  98
  99                 await(numberOfGeneratedMessages + " records received")
 100                                 .atMost(Duration.ofSeconds(30))
 101                                 .pollInterval(Duration.ofSeconds(1))
 102                                 .until(() -> receivedRecords.size() >= numberOfGeneratedMessages);
 103
 104                 await("Offsets committed")
 105                                 .atMost(Duration.ofSeconds(10))
 106                                 .pollInterval(Duration.ofSeconds(1))
 107                                 .untilAsserted(() ->
 108                                 {
 109                                         checkSeenOffsetsForProgress();
 110                                         assertSeenOffsetsEqualCommittedOffsets(seenOffsets);
 111                                 });
 112
 113                 assertThatExceptionOfType(IllegalStateException.class)
 114                                 .isThrownBy(() -> endlessConsumer.exitStatus())
 115                                 .describedAs("Consumer should still be running");
 116
 117                 endlessConsumer.stop();
 118                 recordGenerator.assertBusinessLogic();
 119         }
 120
 121         @Test
 122         @SkipWhenErrorCannotBeGenerated(poisonPill = true)
 123         void commitsOffsetOfErrorForReprocessingOnDeserializationError()
 124         {
 125                 int numberOfGeneratedMessages =
 126                                 recordGenerator.generate(true, false, messageSender);
 127
 128                 await("Consumer failed")
 129                                 .atMost(Duration.ofSeconds(30))
 130                                 .pollInterval(Duration.ofSeconds(1))
 131                                 .until(() -> !endlessConsumer.running());
 132
 133                 checkSeenOffsetsForProgress();
 134                 assertSeenOffsetsEqualCommittedOffsets(seenOffsets);
 135
 136                 endlessConsumer.start();
 137                 await("Consumer failed")
 138                                 .atMost(Duration.ofSeconds(30))
 139                                 .pollInterval(Duration.ofSeconds(1))
 140                                 .until(() -> !endlessConsumer.running());
 141
 142                 checkSeenOffsetsForProgress();
 143                 assertSeenOffsetsEqualCommittedOffsets(seenOffsets);
 144                 assertThat(receivedRecords.size())
 145                                 .describedAs("Received not all sent events")
 146                                 .isLessThan(numberOfGeneratedMessages);
 147
 148                 assertThatNoException()
 149                                 .describedAs("Consumer should not be running")
 150                                 .isThrownBy(() -> endlessConsumer.exitStatus());
 151                 assertThat(endlessConsumer.exitStatus())
 152                                 .describedAs("Consumer should have exited abnormally")
 153                                 .containsInstanceOf(RecordDeserializationException.class);
 154
 155                 recordGenerator.assertBusinessLogic();
 156         }
 157
 158         @Test
 159         @SkipWhenErrorCannotBeGenerated(logicError = true)
 160         void doesNotCommitOffsetsOnLogicError()
 161         {
 162                 int numberOfGeneratedMessages =
 163                                 recordGenerator.generate(false, true, messageSender);
 164
 165                 await("Consumer failed")
 166                                 .atMost(Duration.ofSeconds(30))
 167                                 .pollInterval(Duration.ofSeconds(1))
 168                                 .until(() -> !endlessConsumer.running());
 169
 170                 checkSeenOffsetsForProgress();
 171                 assertSeenOffsetsAreBehindCommittedOffsets(seenOffsets);
 172
 173                 endlessConsumer.start();
 174                 await("Consumer failed")
 175                                 .atMost(Duration.ofSeconds(30))
 176                                 .pollInterval(Duration.ofSeconds(1))
 177                                 .until(() -> !endlessConsumer.running());
 178
 179                 assertSeenOffsetsAreBehindCommittedOffsets(seenOffsets);
 180
 181                 assertThatNoException()
 182                                 .describedAs("Consumer should not be running")
 183                                 .isThrownBy(() -> endlessConsumer.exitStatus());
 184                 assertThat(endlessConsumer.exitStatus())
 185                                 .describedAs("Consumer should have exited abnormally")
 186                                 .containsInstanceOf(RuntimeException.class);
 187
 188                 recordGenerator.assertBusinessLogic();
 189         }
 190
 191
 192         /** Helper methods for the verification of expectations */
 193
 194         void assertSeenOffsetsEqualCommittedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 195         {
 196                 doForCurrentOffsets((tp, offset) ->
 197                 {
 198                         Long expected = offsetsToCheck.get(tp) + 1;
 199                         log.debug("Checking, if the offset {} for {} is exactly {}", offset, tp, expected);
 200                         assertThat(offset)
 201                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 202                                         .isEqualTo(expected);
 203                 });
 204         }
 205
 206         void assertSeenOffsetsAreBehindCommittedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 207         {
 208                 List<Boolean> isOffsetBehindSeen = new LinkedList<>();
 209
 210                 doForCurrentOffsets((tp, offset) ->
 211                 {
 212                         Long expected = offsetsToCheck.get(tp) + 1;
 213                         log.debug("Checking, if the offset {} for {} is at most {}", offset, tp, expected);
 214                         assertThat(offset)
 215                                         .describedAs("Committed offset must be at most equal to the offset of the consumer")
 216                                         .isLessThanOrEqualTo(expected);
 217                         isOffsetBehindSeen.add(offset < expected);
 218                 });
 219
 220                 assertThat(isOffsetBehindSeen.stream().reduce(false, (result, next) -> result | next))
 221                                 .describedAs("Committed offsets are behind seen offsets")
 222                                 .isTrue();
 223         }
 224
 225         void checkSeenOffsetsForProgress()
 226         {
 227                 // Be sure, that some messages were consumed...!
 228                 Set<TopicPartition> withProgress = new HashSet<>();
 229                 partitions().forEach(tp ->
 230                 {
 231                         Long oldOffset = oldOffsets.get(tp) + 1;
 232                         Long newOffset = seenOffsets.get(tp) + 1;
 233                         if (!oldOffset.equals(newOffset))
 234                         {
 235                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 236                                 withProgress.add(tp);
 237                         }
 238                 });
 239                 assertThat(withProgress)
 240                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 241                                 .isNotEmpty();
 242         }
 243
 244
 245         /** Helper methods for setting up and running the tests */
 246
 247         void seekToEnd()
 248         {
 249                 offsetConsumer.assign(partitions());
 250                 offsetConsumer.seekToEnd(partitions());
 251                 partitions().forEach(tp ->
 252                 {
 253                         // seekToEnd() works lazily: it only takes effect on poll()/position()
 254                         Long offset = offsetConsumer.position(tp);
 255                         log.info("New position for {}: {}", tp, offset);
 256                 });
 257                 // The new positions must be commited!
 258                 offsetConsumer.commitSync();
 259                 offsetConsumer.unsubscribe();
 260         }
 261
 262         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 263         {
 264                 offsetConsumer.assign(partitions());
 265                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 266                 offsetConsumer.unsubscribe();
 267         }
 268
 269         List<TopicPartition> partitions()
 270         {
 271                 return
 272                                 IntStream
 273                                                 .range(0, PARTITIONS)
 274                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 275                                                 .collect(Collectors.toList());
 276         }
 277
 278
 279         public interface RecordGenerator
 280         {
 281                 int generate(
 282                                 boolean poisonPills,
 283                                 boolean logicErrors,
 284                                 Consumer<ProducerRecord<Bytes, Bytes>> messageSender);
 285
 286                 default boolean canGeneratePoisonPill()
 287                 {
 288                         return true;
 289                 }
 290
 291                 default boolean canGenerateLogicError()
 292                 {
 293                         return true;
 294                 }
 295
 296                 default void assertBusinessLogic()
 297                 {
 298                         log.debug("No business-logic to assert");
 299                 }
 300         }
 301
 302         void sendMessage(ProducerRecord<Bytes, Bytes> record)
 303         {
 304                 testRecordProducer.send(record, (metadata, e) ->
 305                 {
 306                         if (metadata != null)
 307                         {
 308                                 log.debug(
 309                                                 "{}|{} - {}={}",
 310                                                 metadata.partition(),
 311                                                 metadata.offset(),
 312                                                 record.key(),
 313                                                 record.value());
 314                         }
 315                         else
 316                         {
 317                                 log.warn(
 318                                                 "Exception for {}={}: {}",
 319                                                 record.key(),
 320                                                 record.value(),
 321                                                 e.toString());
 322                         }
 323                 });
 324         }
 325
 326
 327         @BeforeEach
 328         public void init()
 329         {
 330                 Properties props;
 331                 props = new Properties();
 332                 props.put("bootstrap.servers", properties.getBootstrapServer());
 333                 props.put("linger.ms", 100);
 334                 props.put("key.serializer", BytesSerializer.class.getName());
 335                 props.put("value.serializer", BytesSerializer.class.getName());
 336                 testRecordProducer = new KafkaProducer<>(props);
 337
 338                 props = new Properties();
 339                 props.put("bootstrap.servers", properties.getBootstrapServer());
 340                 props.put("client.id", "OFFSET-CONSUMER");
 341                 props.put("group.id", properties.getGroupId());
 342                 props.put("key.deserializer", BytesDeserializer.class.getName());
 343                 props.put("value.deserializer", BytesDeserializer.class.getName());
 344                 offsetConsumer = new KafkaConsumer<>(props);
 345
 346                 mongoClient.getDatabase(mongoProperties.getDatabase()).drop();
 347                 seekToEnd();
 348
 349                 oldOffsets = new HashMap<>();
 350                 seenOffsets = new HashMap<>();
 351                 receivedRecords = new HashSet<>();
 352
 353                 doForCurrentOffsets((tp, offset) ->
 354                 {
 355                         oldOffsets.put(tp, offset - 1);
 356                         seenOffsets.put(tp, offset - 1);
 357                 });
 358
 359                 TestRecordHandler<K, V> captureOffsetAndExecuteTestHandler =
 360                                 new TestRecordHandler<K, V>(recordHandler)
 361                                 {
 362                                         @Override
 363                                         public void onNewRecord(ConsumerRecord<K, V> record)
 364                                         {
 365                                                 seenOffsets.put(
 366                                                                 new TopicPartition(record.topic(), record.partition()),
 367                                                                 record.offset());
 368                                                 receivedRecords.add(record);
 369                                         }
 370                                 };
 371
 372                 endlessConsumer =
 373                                 new EndlessConsumer<>(
 374                                                 executor,
 375                                                 properties.getClientId(),
 376                                                 properties.getTopic(),
 377                                                 kafkaConsumer,
 378                                                 rebalanceListener,
 379                                                 captureOffsetAndExecuteTestHandler);
 380
 381                 endlessConsumer.start();
 382         }
 383
 384         @AfterEach
 385         public void deinit()
 386         {
 387                 try
 388                 {
 389                         testRecordProducer.close();
 390                         offsetConsumer.close();
 391                 }
 392                 catch (Exception e)
 393                 {
 394                         log.info("Exception while stopping the consumer: {}", e.toString());
 395                 }
 396         }
 397
 398
 399         @TestConfiguration
 400         @Import(ApplicationConfiguration.class)
 401         public static class Configuration
 402         {
 403         }
 404 }