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         PollIntervalAwareConsumerRebalanceListener 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> newOffsets;
  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()
  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                                         compareToCommitedOffsets(newOffsets);
 111                                 });
 112
 113                 assertThatExceptionOfType(IllegalStateException.class)
 114                                 .isThrownBy(() -> endlessConsumer.exitStatus())
 115                                 .describedAs("Consumer should still be running");
 116
 117                 recordGenerator.assertBusinessLogic();
 118         }
 119
 120         @Test
 121         @SkipWhenErrorCannotBeGenerated(poisonPill = true)
 122         void commitsOffsetOfErrorForReprocessingOnDeserializationError()
 123         {
 124                 int numberOfGeneratedMessages =
 125                                 recordGenerator.generate(true, false, messageSender);
 126
 127                 await("Consumer failed")
 128                                 .atMost(Duration.ofSeconds(30))
 129                                 .pollInterval(Duration.ofSeconds(1))
 130                                 .until(() -> !endlessConsumer.running());
 131
 132                 checkSeenOffsetsForProgress();
 133                 compareToCommitedOffsets(newOffsets);
 134
 135                 endlessConsumer.start();
 136                 await("Consumer failed")
 137                                 .atMost(Duration.ofSeconds(30))
 138                                 .pollInterval(Duration.ofSeconds(1))
 139                                 .until(() -> !endlessConsumer.running());
 140
 141                 checkSeenOffsetsForProgress();
 142                 compareToCommitedOffsets(newOffsets);
 143                 assertThat(receivedRecords.size())
 144                                 .describedAs("Received not all sent events")
 145                                 .isLessThan(numberOfGeneratedMessages);
 146
 147                 assertThatNoException()
 148                                 .describedAs("Consumer should not be running")
 149                                 .isThrownBy(() -> endlessConsumer.exitStatus());
 150                 assertThat(endlessConsumer.exitStatus())
 151                                 .describedAs("Consumer should have exited abnormally")
 152                                 .containsInstanceOf(RecordDeserializationException.class);
 153
 154                 recordGenerator.assertBusinessLogic();
 155         }
 156
 157         @Test
 158         @SkipWhenErrorCannotBeGenerated(logicError = true)
 159         void doesNotCommitOffsetsOnLogicError()
 160         {
 161                 int numberOfGeneratedMessages =
 162                                 recordGenerator.generate(false, true, messageSender);
 163
 164                 await("Consumer failed")
 165                                 .atMost(Duration.ofSeconds(30))
 166                                 .pollInterval(Duration.ofSeconds(1))
 167                                 .until(() -> !endlessConsumer.running());
 168
 169                 checkSeenOffsetsForProgress();
 170                 compareToCommitedOffsets(oldOffsets);
 171
 172                 endlessConsumer.start();
 173                 await("Consumer failed")
 174                                 .atMost(Duration.ofSeconds(30))
 175                                 .pollInterval(Duration.ofSeconds(1))
 176                                 .until(() -> !endlessConsumer.running());
 177
 178                 checkSeenOffsetsForProgress();
 179                 compareToCommitedOffsets(oldOffsets);
 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 compareToCommitedOffsets(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 {}", tp, expected);
 200                         assertThat(offset)
 201                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 202                                         .isEqualTo(expected);
 203                 });
 204         }
 205
 206         void checkSeenOffsetsForProgress()
 207         {
 208                 // Be sure, that some messages were consumed...!
 209                 Set<TopicPartition> withProgress = new HashSet<>();
 210                 partitions().forEach(tp ->
 211                 {
 212                         Long oldOffset = oldOffsets.get(tp) + 1;
 213                         Long newOffset = newOffsets.get(tp) + 1;
 214                         if (!oldOffset.equals(newOffset))
 215                         {
 216                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 217                                 withProgress.add(tp);
 218                         }
 219                 });
 220                 assertThat(withProgress)
 221                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 222                                 .isNotEmpty();
 223         }
 224
 225
 226         /** Helper methods for setting up and running the tests */
 227
 228         void seekToEnd()
 229         {
 230                 offsetConsumer.assign(partitions());
 231                 offsetConsumer.seekToEnd(partitions());
 232                 partitions().forEach(tp ->
 233                 {
 234                         // seekToEnd() works lazily: it only takes effect on poll()/position()
 235                         Long offset = offsetConsumer.position(tp);
 236                         log.info("New position for {}: {}", tp, offset);
 237                 });
 238                 // The new positions must be commited!
 239                 offsetConsumer.commitSync();
 240                 offsetConsumer.unsubscribe();
 241         }
 242
 243         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 244         {
 245                 offsetConsumer.assign(partitions());
 246                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 247                 offsetConsumer.unsubscribe();
 248         }
 249
 250         List<TopicPartition> partitions()
 251         {
 252                 return
 253                                 IntStream
 254                                                 .range(0, PARTITIONS)
 255                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 256                                                 .collect(Collectors.toList());
 257         }
 258
 259
 260         public interface RecordGenerator
 261         {
 262                 int generate(
 263                                 boolean poisonPills,
 264                                 boolean logicErrors,
 265                                 Consumer<ProducerRecord<Bytes, Bytes>> messageSender);
 266
 267                 default boolean canGeneratePoisonPill()
 268                 {
 269                         return true;
 270                 }
 271
 272                 default boolean canGenerateLogicError()
 273                 {
 274                         return true;
 275                 }
 276
 277                 default void assertBusinessLogic()
 278                 {
 279                         log.debug("No business-logic to assert");
 280                 }
 281         }
 282
 283         void sendMessage(ProducerRecord<Bytes, Bytes> record)
 284         {
 285                 testRecordProducer.send(record, (metadata, e) ->
 286                 {
 287                         if (metadata != null)
 288                         {
 289                                 log.debug(
 290                                                 "{}|{} - {}={}",
 291                                                 metadata.partition(),
 292                                                 metadata.offset(),
 293                                                 record.key(),
 294                                                 record.value());
 295                         }
 296                         else
 297                         {
 298                                 log.warn(
 299                                                 "Exception for {}={}: {}",
 300                                                 record.key(),
 301                                                 record.value(),
 302                                                 e.toString());
 303                         }
 304                 });
 305         }
 306
 307
 308         @BeforeEach
 309         public void init()
 310         {
 311                 Properties props;
 312                 props = new Properties();
 313                 props.put("bootstrap.servers", properties.getBootstrapServer());
 314                 props.put("linger.ms", 100);
 315                 props.put("key.serializer", BytesSerializer.class.getName());
 316                 props.put("value.serializer", BytesSerializer.class.getName());
 317                 testRecordProducer = new KafkaProducer<>(props);
 318
 319                 props = new Properties();
 320                 props.put("bootstrap.servers", properties.getBootstrapServer());
 321                 props.put("client.id", "OFFSET-CONSUMER");
 322                 props.put("group.id", properties.getGroupId());
 323                 props.put("key.deserializer", BytesDeserializer.class.getName());
 324                 props.put("value.deserializer", BytesDeserializer.class.getName());
 325                 offsetConsumer = new KafkaConsumer<>(props);
 326
 327                 seekToEnd();
 328
 329                 oldOffsets = new HashMap<>();
 330                 newOffsets = new HashMap<>();
 331                 receivedRecords = new HashSet<>();
 332
 333                 doForCurrentOffsets((tp, offset) ->
 334                 {
 335                         oldOffsets.put(tp, offset - 1);
 336                         newOffsets.put(tp, offset - 1);
 337                 });
 338
 339                 TestRecordHandler<K, V> captureOffsetAndExecuteTestHandler =
 340                                 new TestRecordHandler<K, V>(recordHandler)
 341                                 {
 342                                         @Override
 343                                         public void onNewRecord(ConsumerRecord<K, V> record)
 344                                         {
 345                                                 newOffsets.put(
 346                                                                 new TopicPartition(record.topic(), record.partition()),
 347                                                                 record.offset());
 348                                                 receivedRecords.add(record);
 349                                         }
 350                                 };
 351
 352                 mongoClient.getDatabase(mongoProperties.getDatabase()).drop();
 353
 354                 endlessConsumer =
 355                                 new EndlessConsumer<>(
 356                                                 executor,
 357                                                 properties.getClientId(),
 358                                                 properties.getTopic(),
 359                                                 kafkaConsumer,
 360                                                 rebalanceListener,
 361                                                 captureOffsetAndExecuteTestHandler);
 362
 363                 endlessConsumer.start();
 364         }
 365
 366         @AfterEach
 367         public void deinit()
 368         {
 369                 try
 370                 {
 371                         endlessConsumer.stop();
 372                         testRecordProducer.close();
 373                         offsetConsumer.close();
 374                 }
 375                 catch (Exception e)
 376                 {
 377                         log.info("Exception while stopping the consumer: {}", e.toString());
 378                 }
 379         }
 380
 381
 382         @TestConfiguration
 383         @Import(ApplicationConfiguration.class)
 384         public static class Configuration
 385         {
 386         }
 387 }