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.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.stream.Collectors;
  29 import java.util.stream.IntStream;
  30
  31 import static de.juplo.kafka.ApplicationTests.*;
  32 import static org.assertj.core.api.Assertions.*;
  33 import static org.awaitility.Awaitility.*;
  34
  35
  36 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  37 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  38 @TestPropertySource(
  39                 properties = {
  40                                 "sumup.requests.bootstrap-server=${spring.embedded.kafka.brokers}",
  41                                 "sumup.requests.topic-in=" + INPUT_TOPIC,
  42                                 "sumup.requests.commit-interval=1s" })
  43 @EmbeddedKafka(topics = { INPUT_TOPIC, OUTPUT_TOPIC }, partitions = PARTITIONS)
  44 @EnableAutoConfiguration
  45 @Slf4j
  46 class ApplicationTests
  47 {
  48         public static final String INPUT_TOPIC = "FOO";
  49         public static final String OUTPUT_TOPIC = "BAR";
  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> testProducer;
  59         @Autowired
  60         KafkaConsumer<String, Integer> kafkaConsumer;
  61         @Autowired
  62         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  63         @Autowired
  64         ApplicationProperties properties;
  65         @Autowired
  66         ExecutorService executor;
  67         @Autowired
  68         RecordHandler noopRecordHandler;
  69
  70         EndlessConsumer<String, Integer> endlessConsumer;
  71         Map<TopicPartition, Long> oldOffsets;
  72         Map<TopicPartition, Long> newOffsets;
  73         Set<ConsumerRecord<String, Integer>> receivedRecords;
  74
  75
  76         /** Tests methods */
  77
  78         @Test
  79         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  80         {
  81                 send100Messages((partition, key, counter) ->
  82                 {
  83                         Bytes value = new Bytes(valueSerializer.serialize(INPUT_TOPIC, counter));
  84                         return new ProducerRecord<>(INPUT_TOPIC, partition, key, value);
  85                 });
  86
  87                 await("100 records received")
  88                                 .atMost(Duration.ofSeconds(30))
  89                                 .pollInterval(Duration.ofSeconds(1))
  90                                 .until(() -> receivedRecords.size() >= 100);
  91
  92                 await("Offsets committed")
  93                                 .atMost(Duration.ofSeconds(10))
  94                                 .pollInterval(Duration.ofSeconds(1))
  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         void commitsOffsetOfErrorForReprocessingOnDeserializationError()
 108         {
 109                 send100Messages((partition, key, counter) ->
 110                 {
 111                         Bytes value = counter == 77
 112                                         ? new Bytes(stringSerializer.serialize(INPUT_TOPIC, "BOOM!"))
 113                                         : new Bytes(valueSerializer.serialize(INPUT_TOPIC, counter));
 114                         return new ProducerRecord<>(INPUT_TOPIC, partition, key, value);
 115                 });
 116
 117                 await("Consumer failed")
 118                                 .atMost(Duration.ofSeconds(30))
 119                                 .pollInterval(Duration.ofSeconds(1))
 120                                 .until(() -> !endlessConsumer.running());
 121
 122                 checkSeenOffsetsForProgress();
 123                 compareToCommitedOffsets(newOffsets);
 124
 125                 endlessConsumer.start();
 126                 await("Consumer failed")
 127                                 .atMost(Duration.ofSeconds(30))
 128                                 .pollInterval(Duration.ofSeconds(1))
 129                                 .until(() -> !endlessConsumer.running());
 130
 131                 checkSeenOffsetsForProgress();
 132                 compareToCommitedOffsets(newOffsets);
 133                 assertThat(receivedRecords.size())
 134                                 .describedAs("Received not all sent events")
 135                                 .isLessThan(100);
 136
 137                 assertThatNoException()
 138                                 .describedAs("Consumer should not be running")
 139                                 .isThrownBy(() -> endlessConsumer.exitStatus());
 140                 assertThat(endlessConsumer.exitStatus())
 141                                 .describedAs("Consumer should have exited abnormally")
 142                                 .containsInstanceOf(RecordDeserializationException.class);
 143         }
 144
 145
 146         /** Helper methods for the verification of expectations */
 147
 148         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 149         {
 150                 doForCurrentOffsets((tp, offset) ->
 151                 {
 152                         Long expected = offsetsToCheck.get(tp) + 1;
 153                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 154                         assertThat(offset)
 155                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 156                                         .isEqualTo(expected);
 157                 });
 158         }
 159
 160         void checkSeenOffsetsForProgress()
 161         {
 162                 // Be sure, that some messages were consumed...!
 163                 Set<TopicPartition> withProgress = new HashSet<>();
 164                 partitions().forEach(tp ->
 165                 {
 166                         Long oldOffset = oldOffsets.get(tp) + 1;
 167                         Long newOffset = newOffsets.get(tp) + 1;
 168                         if (!oldOffset.equals(newOffset))
 169                         {
 170                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 171                                 withProgress.add(tp);
 172                         }
 173                 });
 174                 assertThat(withProgress)
 175                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 176                                 .isNotEmpty();
 177         }
 178
 179
 180         /** Helper methods for setting up and running the tests */
 181
 182         void seekToEnd()
 183         {
 184                 offsetConsumer.assign(partitions());
 185                 offsetConsumer.seekToEnd(partitions());
 186                 partitions().forEach(tp ->
 187                 {
 188                         // seekToEnd() works lazily: it only takes effect on poll()/position()
 189                         Long offset = offsetConsumer.position(tp);
 190                         log.info("New position for {}: {}", tp, offset);
 191                 });
 192                 // The new positions must be commited!
 193                 offsetConsumer.commitSync();
 194                 offsetConsumer.unsubscribe();
 195         }
 196
 197         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 198         {
 199                 offsetConsumer.assign(partitions());
 200                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 201                 offsetConsumer.unsubscribe();
 202         }
 203
 204         List<TopicPartition> partitions()
 205         {
 206                 return
 207                                 IntStream
 208                                                 .range(0, PARTITIONS)
 209                                                 .mapToObj(partition -> new TopicPartition(INPUT_TOPIC, partition))
 210                                                 .collect(Collectors.toList());
 211         }
 212
 213
 214         public interface RecordGenerator<K, V>
 215         {
 216                 public ProducerRecord<String, Bytes> generate(int partition, String key, int counter);
 217         }
 218
 219         void send100Messages(RecordGenerator recordGenerator)
 220         {
 221                 int i = 0;
 222
 223                 for (int partition = 0; partition < 10; partition++)
 224                 {
 225                         for (int key = 0; key < 10; key++)
 226                         {
 227                                 ProducerRecord<String, Bytes> record =
 228                                                 recordGenerator.generate(partition, Integer.toString(partition*10+key%2), ++i);
 229
 230                                 testProducer.send(record, (metadata, e) ->
 231                                 {
 232                                         if (metadata != null)
 233                                         {
 234                                                 log.debug(
 235                                                                 "{}|{} - {}={}",
 236                                                                 metadata.partition(),
 237                                                                 metadata.offset(),
 238                                                                 record.key(),
 239                                                                 record.value());
 240                                         }
 241                                         else
 242                                         {
 243                                                 log.warn(
 244                                                                 "Exception for {}={}: {}",
 245                                                                 record.key(),
 246                                                                 record.value(),
 247                                                                 e.toString());
 248                                         }
 249                                 });
 250                         }
 251                 }
 252         }
 253
 254
 255         @BeforeEach
 256         public void init()
 257         {
 258                 seekToEnd();
 259
 260                 oldOffsets = new HashMap<>();
 261                 newOffsets = new HashMap<>();
 262                 receivedRecords = new HashSet<>();
 263
 264                 doForCurrentOffsets((tp, offset) ->
 265                 {
 266                         oldOffsets.put(tp, offset - 1);
 267                         newOffsets.put(tp, offset - 1);
 268                 });
 269
 270                 TestRecordHandler<String, Integer> captureOffsetAndExecuteTestHandler =
 271                                 new TestRecordHandler<String, Integer>(noopRecordHandler) {
 272                                         @Override
 273                                         public void onNewRecord(ConsumerRecord<String, Integer> record)
 274                                         {
 275                                                 newOffsets.put(
 276                                                                 new TopicPartition(record.topic(), record.partition()),
 277                                                                 record.offset());
 278                                                 receivedRecords.add(record);
 279                                         }
 280                                 };
 281
 282                 endlessConsumer =
 283                                 new EndlessConsumer<>(
 284                                                 executor,
 285                                                 properties.getClientId(),
 286                                                 properties.getTopicIn(),
 287                                                 kafkaConsumer,
 288                                                 captureOffsetAndExecuteTestHandler);
 289
 290                 endlessConsumer.start();
 291         }
 292
 293         @AfterEach
 294         public void deinit()
 295         {
 296                 try
 297                 {
 298                         endlessConsumer.stop();
 299                 }
 300                 catch (Exception e)
 301                 {
 302                         log.info("Exception while stopping the consumer: {}", e.toString());
 303                 }
 304         }
 305
 306
 307         @TestConfiguration
 308         @Import(ApplicationConfiguration.class)
 309         public static class Configuration
 310         {
 311                 @Bean
 312                 Serializer<Integer> valueSerializer()
 313                 {
 314                         return new IntegerSerializer();
 315                 }
 316
 317                 @Bean
 318                 KafkaProducer<String, Bytes> testProducer(ApplicationProperties properties)
 319                 {
 320                         Properties props = new Properties();
 321                         props.put("bootstrap.servers", properties.getBootstrapServer());
 322                         props.put("linger.ms", 100);
 323                         props.put("key.serializer", StringSerializer.class.getName());
 324                         props.put("value.serializer", BytesSerializer.class.getName());
 325
 326                         return new KafkaProducer<>(props);
 327                 }
 328
 329                 @Bean
 330                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 331                 {
 332                         Properties props = new Properties();
 333                         props.put("bootstrap.servers", properties.getBootstrapServer());
 334                         props.put("client.id", "OFFSET-CONSUMER");
 335                         props.put("group.id", properties.getGroupId());
 336                         props.put("key.deserializer", BytesDeserializer.class.getName());
 337                         props.put("value.deserializer", BytesDeserializer.class.getName());
 338
 339                         return new KafkaConsumer<>(props);
 340                 }
 341
 342                 @Bean
 343                 KafkaProducer<String, String> kafkaProducer(ApplicationProperties properties)
 344                 {
 345                         Properties props = new Properties();
 346                         props.put("bootstrap.servers", properties.getBootstrapServer());
 347                         props.put("key.serializer", StringSerializer.class.getName());
 348                         props.put("value.serializer", StringSerializer.class.getName());
 349
 350                         return new KafkaProducer<>(props);
 351                 }
 352         }
 353 }