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