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