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