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