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         PartitionStatisticsRepository partitionStatisticsRepository;
  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                 partitions().forEach(tp ->
 181                 {
 182                         String partition = Integer.toString(tp.partition());
 183                         Optional<Long> offset = partitionStatisticsRepository.findById(partition).map(document -> document.offset);
 184                         consumer.accept(tp, offset.orElse(0l));
 185                 });
 186         }
 187
 188         List<TopicPartition> partitions()
 189         {
 190                 return
 191                                 IntStream
 192                                                 .range(0, PARTITIONS)
 193                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 194                                                 .collect(Collectors.toList());
 195         }
 196
 197
 198         void send100Messages(Function<Long, Bytes> messageGenerator)
 199         {
 200                 long i = 0;
 201
 202                 for (int partition = 0; partition < 10; partition++)
 203                 {
 204                         for (int key = 0; key < 10; key++)
 205                         {
 206                                 Bytes value = messageGenerator.apply(++i);
 207
 208                                 ProducerRecord<String, Bytes> record =
 209                                                 new ProducerRecord<>(
 210                                                                 TOPIC,
 211                                                                 partition,
 212                                                                 Integer.toString(key%2),
 213                                                                 value);
 214
 215                                 kafkaProducer.send(record, (metadata, e) ->
 216                                 {
 217                                         if (metadata != null)
 218                                         {
 219                                                 log.debug(
 220                                                                 "{}|{} - {}={}",
 221                                                                 metadata.partition(),
 222                                                                 metadata.offset(),
 223                                                                 record.key(),
 224                                                                 record.value());
 225                                         }
 226                                         else
 227                                         {
 228                                                 log.warn(
 229                                                                 "Exception for {}={}: {}",
 230                                                                 record.key(),
 231                                                                 record.value(),
 232                                                                 e.toString());
 233                                         }
 234                                 });
 235                         }
 236                 }
 237         }
 238
 239
 240         @BeforeEach
 241         public void init()
 242         {
 243                 testHandler = record -> {} ;
 244
 245                 oldOffsets = new HashMap<>();
 246                 newOffsets = new HashMap<>();
 247                 receivedRecords = new HashSet<>();
 248
 249                 doForCurrentOffsets((tp, offset) ->
 250                 {
 251                         oldOffsets.put(tp, offset - 1);
 252                         newOffsets.put(tp, offset - 1);
 253                 });
 254
 255                 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
 256                                 record ->
 257                                 {
 258                                         newOffsets.put(
 259                                                         new TopicPartition(record.topic(), record.partition()),
 260                                                         record.offset());
 261                                         receivedRecords.add(record);
 262                                         testHandler.accept(record);
 263                                 };
 264
 265                 endlessConsumer =
 266                                 new EndlessConsumer<>(
 267                                                 executor,
 268                                                 repository,
 269                                                 properties.getClientId(),
 270                                                 properties.getTopic(),
 271                                                 kafkaConsumer,
 272                                                 captureOffsetAndExecuteTestHandler);
 273
 274                 endlessConsumer.start();
 275         }
 276
 277         @AfterEach
 278         public void deinit()
 279         {
 280                 try
 281                 {
 282                         endlessConsumer.stop();
 283                 }
 284                 catch (Exception e)
 285                 {
 286                         log.info("Exception while stopping the consumer: {}", e.toString());
 287                 }
 288         }
 289
 290
 291         @TestConfiguration
 292         @Import(ApplicationConfiguration.class)
 293         public static class Configuration
 294         {
 295                 @Bean
 296                 Serializer<Long> serializer()
 297                 {
 298                         return new LongSerializer();
 299                 }
 300
 301                 @Bean
 302                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 303                 {
 304                         Properties props = new Properties();
 305                         props.put("bootstrap.servers", properties.getBootstrapServer());
 306                         props.put("linger.ms", 100);
 307                         props.put("key.serializer", StringSerializer.class.getName());
 308                         props.put("value.serializer", BytesSerializer.class.getName());
 309
 310                         return new KafkaProducer<>(props);
 311                 }
 312         }
 313 }