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.context.ConfigDataApplicationContextInitializer;
  16 import org.springframework.boot.test.context.TestConfiguration;
  17 import org.springframework.context.annotation.Bean;
  18 import org.springframework.context.annotation.Import;
  19 import org.springframework.kafka.test.context.EmbeddedKafka;
  20 import org.springframework.test.context.TestPropertySource;
  21 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  22
  23 import java.time.Duration;
  24 import java.util.*;
  25 import java.util.concurrent.ExecutionException;
  26 import java.util.concurrent.ExecutorService;
  27 import java.util.function.BiConsumer;
  28 import java.util.stream.Collectors;
  29 import java.util.stream.IntStream;
  30
  31 import static de.juplo.kafka.ApplicationTests.PARTITIONS;
  32 import static de.juplo.kafka.ApplicationTests.TOPIC;
  33 import static org.assertj.core.api.Assertions.*;
  34 import static org.awaitility.Awaitility.*;
  35
  36
  37 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  38 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  39 @TestPropertySource(
  40                 properties = {
  41                                 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
  42                                 "consumer.topic=" + TOPIC,
  43                                 "consumer.commit-interval=1s" })
  44 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  45 @EnableAutoConfiguration
  46 @Slf4j
  47 class ApplicationTests
  48 {
  49         public static final String TOPIC = "FOO";
  50         public static final int PARTITIONS = 10;
  51
  52
  53         StringSerializer stringSerializer = new StringSerializer();
  54
  55         @Autowired
  56         Serializer valueSerializer;
  57         @Autowired
  58         KafkaProducer<String, Bytes> kafkaProducer;
  59         @Autowired
  60         KafkaConsumer<String, Long> kafkaConsumer;
  61         @Autowired
  62         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  63         @Autowired
  64         ApplicationProperties properties;
  65         @Autowired
  66         ExecutorService executor;
  67         @Autowired
  68         ApplicationRebalanceListener rebalanceListener;
  69         @Autowired
  70         ApplicationRecordHandler recordHandler;
  71
  72         EndlessConsumer<String, Long> endlessConsumer;
  73         Map<TopicPartition, Long> oldOffsets;
  74         Map<TopicPartition, Long> newOffsets;
  75         Set<ConsumerRecord<String, Long>> receivedRecords;
  76
  77
  78         /** Tests methods */
  79
  80         @Test
  81         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  82         {
  83                 send100Messages((partition, key, counter) ->
  84                 {
  85                         Bytes value = new Bytes(valueSerializer.serialize(TOPIC, counter));
  86                         return new ProducerRecord<>(TOPIC, partition, key, value);
  87                 });
  88
  89                 await("100 records received")
  90                                 .atMost(Duration.ofSeconds(30))
  91                                 .pollInterval(Duration.ofSeconds(1))
  92                                 .until(() -> receivedRecords.size() >= 100);
  93
  94                 await("Offsets committed")
  95                                 .atMost(Duration.ofSeconds(10))
  96                                 .pollInterval(Duration.ofSeconds(1))
  97                                 .untilAsserted(() ->
  98                                 {
  99                                         checkSeenOffsetsForProgress();
 100                                         compareToCommitedOffsets(newOffsets);
 101                                 });
 102
 103                 assertThatExceptionOfType(IllegalStateException.class)
 104                                 .isThrownBy(() -> endlessConsumer.exitStatus())
 105                                 .describedAs("Consumer should still be running");
 106         }
 107
 108         @Test
 109         void commitsOffsetOfErrorForReprocessingOnDeserializationError()
 110         {
 111                 send100Messages((partition, key, counter) ->
 112                 {
 113                         Bytes value = counter == 77
 114                                         ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
 115                                         : new Bytes(valueSerializer.serialize(TOPIC, counter));
 116                         return new ProducerRecord<>(TOPIC, partition, key, value);
 117                 });
 118
 119                 await("Consumer failed")
 120                                 .atMost(Duration.ofSeconds(30))
 121                                 .pollInterval(Duration.ofSeconds(1))
 122                                 .until(() -> !endlessConsumer.running());
 123
 124                 checkSeenOffsetsForProgress();
 125                 compareToCommitedOffsets(newOffsets);
 126
 127                 endlessConsumer.start();
 128                 await("Consumer failed")
 129                                 .atMost(Duration.ofSeconds(30))
 130                                 .pollInterval(Duration.ofSeconds(1))
 131                                 .until(() -> !endlessConsumer.running());
 132
 133                 checkSeenOffsetsForProgress();
 134                 compareToCommitedOffsets(newOffsets);
 135                 assertThat(receivedRecords.size())
 136                                 .describedAs("Received not all sent events")
 137                                 .isLessThan(100);
 138
 139                 assertThatNoException()
 140                                 .describedAs("Consumer should not be running")
 141                                 .isThrownBy(() -> endlessConsumer.exitStatus());
 142                 assertThat(endlessConsumer.exitStatus())
 143                                 .describedAs("Consumer should have exited abnormally")
 144                                 .containsInstanceOf(RecordDeserializationException.class);
 145         }
 146
 147
 148         /** Helper methods for the verification of expectations */
 149
 150         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 151         {
 152                 doForCurrentOffsets((tp, offset) ->
 153                 {
 154                         Long expected = offsetsToCheck.get(tp) + 1;
 155                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 156                         assertThat(offset)
 157                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 158                                         .isEqualTo(expected);
 159                 });
 160         }
 161
 162         void checkSeenOffsetsForProgress()
 163         {
 164                 // Be sure, that some messages were consumed...!
 165                 Set<TopicPartition> withProgress = new HashSet<>();
 166                 partitions().forEach(tp ->
 167                 {
 168                         Long oldOffset = oldOffsets.get(tp) + 1;
 169                         Long newOffset = newOffsets.get(tp) + 1;
 170                         if (!oldOffset.equals(newOffset))
 171                         {
 172                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 173                                 withProgress.add(tp);
 174                         }
 175                 });
 176                 assertThat(withProgress)
 177                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 178                                 .isNotEmpty();
 179         }
 180
 181
 182         /** Helper methods for setting up and running the tests */
 183
 184         void seekToEnd()
 185         {
 186                 offsetConsumer.assign(partitions());
 187                 offsetConsumer.seekToEnd(partitions());
 188                 partitions().forEach(tp ->
 189                 {
 190                         // seekToEnd() works lazily: it only takes effect on poll()/position()
 191                         Long offset = offsetConsumer.position(tp);
 192                         log.info("New position for {}: {}", tp, offset);
 193                 });
 194                 // The new positions must be commited!
 195                 offsetConsumer.commitSync();
 196                 offsetConsumer.unsubscribe();
 197         }
 198
 199         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 200         {
 201                 offsetConsumer.assign(partitions());
 202                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 203                 offsetConsumer.unsubscribe();
 204         }
 205
 206         List<TopicPartition> partitions()
 207         {
 208                 return
 209                                 IntStream
 210                                                 .range(0, PARTITIONS)
 211                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 212                                                 .collect(Collectors.toList());
 213         }
 214
 215
 216         public interface RecordGenerator<K, V>
 217         {
 218                 public ProducerRecord<String, Bytes> generate(int partition, String key, long counter);
 219         }
 220
 221         void send100Messages(RecordGenerator recordGenerator)
 222         {
 223                 long i = 0;
 224
 225                 for (int partition = 0; partition < 10; partition++)
 226                 {
 227                         for (int key = 0; key < 10; key++)
 228                         {
 229                                 ProducerRecord<String, Bytes> record =
 230                                                 recordGenerator.generate(partition, Integer.toString(partition*10+key%2), ++i);
 231
 232                                 kafkaProducer.send(record, (metadata, e) ->
 233                                 {
 234                                         if (metadata != null)
 235                                         {
 236                                                 log.debug(
 237                                                                 "{}|{} - {}={}",
 238                                                                 metadata.partition(),
 239                                                                 metadata.offset(),
 240                                                                 record.key(),
 241                                                                 record.value());
 242                                         }
 243                                         else
 244                                         {
 245                                                 log.warn(
 246                                                                 "Exception for {}={}: {}",
 247                                                                 record.key(),
 248                                                                 record.value(),
 249                                                                 e.toString());
 250                                         }
 251                                 });
 252                         }
 253                 }
 254         }
 255
 256
 257         @BeforeEach
 258         public void init()
 259         {
 260                 seekToEnd();
 261
 262                 oldOffsets = new HashMap<>();
 263                 newOffsets = new HashMap<>();
 264                 receivedRecords = new HashSet<>();
 265
 266                 doForCurrentOffsets((tp, offset) ->
 267                 {
 268                         oldOffsets.put(tp, offset - 1);
 269                         newOffsets.put(tp, offset - 1);
 270                 });
 271
 272                 TestRecordHandler<String, Long> captureOffsetAndExecuteTestHandler =
 273                                 new TestRecordHandler<String, Long>(recordHandler) {
 274                                         @Override
 275                                         public void onNewRecord(ConsumerRecord<String, Long> record)
 276                                         {
 277                                                 newOffsets.put(
 278                                                                 new TopicPartition(record.topic(), record.partition()),
 279                                                                 record.offset());
 280                                                 receivedRecords.add(record);
 281                                         }
 282                                 };
 283
 284                 endlessConsumer =
 285                                 new EndlessConsumer<>(
 286                                                 executor,
 287                                                 properties.getClientId(),
 288                                                 properties.getTopic(),
 289                                                 kafkaConsumer,
 290                                                 rebalanceListener,
 291                                                 captureOffsetAndExecuteTestHandler);
 292
 293                 endlessConsumer.start();
 294         }
 295
 296         @AfterEach
 297         public void deinit()
 298         {
 299                 try
 300                 {
 301                         endlessConsumer.stop();
 302                 }
 303                 catch (Exception e)
 304                 {
 305                         log.info("Exception while stopping the consumer: {}", e.toString());
 306                 }
 307         }
 308
 309
 310         @TestConfiguration
 311         @Import(ApplicationConfiguration.class)
 312         public static class Configuration
 313         {
 314                 @Bean
 315                 Serializer<Long> serializer()
 316                 {
 317                         return new LongSerializer();
 318                 }
 319
 320                 @Bean
 321                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 322                 {
 323                         Properties props = new Properties();
 324                         props.put("bootstrap.servers", properties.getBootstrapServer());
 325                         props.put("linger.ms", 100);
 326                         props.put("key.serializer", StringSerializer.class.getName());
 327                         props.put("value.serializer", BytesSerializer.class.getName());
 328
 329                         return new KafkaProducer<>(props);
 330                 }
 331
 332                 @Bean
 333                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 334                 {
 335                         Properties props = new Properties();
 336                         props.put("bootstrap.servers", properties.getBootstrapServer());
 337                         props.put("client.id", "OFFSET-CONSUMER");
 338                         props.put("group.id", properties.getGroupId());
 339                         props.put("key.deserializer", BytesDeserializer.class.getName());
 340                         props.put("value.deserializer", BytesDeserializer.class.getName());
 341
 342                         return new KafkaConsumer<>(props);
 343                 }
 344         }
 345 }