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.test.context.ConfigDataApplicationContextInitializer;
  15 import org.springframework.boot.test.context.TestConfiguration;
  16 import org.springframework.context.annotation.Bean;
  17 import org.springframework.context.annotation.Import;
  18 import org.springframework.kafka.test.context.EmbeddedKafka;
  19 import org.springframework.test.context.TestPropertySource;
  20 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  21
  22 import java.time.Duration;
  23 import java.util.*;
  24 import java.util.concurrent.ExecutionException;
  25 import java.util.concurrent.ExecutorService;
  26 import java.util.function.BiConsumer;
  27 import java.util.function.Consumer;
  28 import java.util.function.Function;
  29 import java.util.stream.Collectors;
  30 import java.util.stream.IntStream;
  31
  32 import static de.juplo.kafka.ApplicationTests.PARTITIONS;
  33 import static de.juplo.kafka.ApplicationTests.TOPIC;
  34 import static org.assertj.core.api.Assertions.*;
  35 import static org.awaitility.Awaitility.*;
  36
  37
  38 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  39 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  40 @TestPropertySource(
  41                 properties = {
  42                                 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
  43                                 "consumer.topic=" + TOPIC })
  44 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  45 @Slf4j
  46 class ApplicationTests
  47 {
  48         public static final String TOPIC = "FOO";
  49         public static final int PARTITIONS = 10;
  50
  51
  52         StringSerializer stringSerializer = new StringSerializer();
  53
  54         @Autowired
  55         Serializer valueSerializer;
  56         @Autowired
  57         KafkaProducer<String, Bytes> kafkaProducer;
  58         @Autowired
  59         KafkaConsumer<String, Long> kafkaConsumer;
  60         @Autowired
  61         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  62         @Autowired
  63         ApplicationProperties properties;
  64         @Autowired
  65         ExecutorService executor;
  66
  67         Consumer<ConsumerRecord<String, Long>> testHandler;
  68         EndlessConsumer<String, Long> endlessConsumer;
  69         Map<TopicPartition, Long> oldOffsets;
  70         Map<TopicPartition, Long> newOffsets;
  71         Set<ConsumerRecord<String, Long>> receivedRecords;
  72
  73
  74         /** Tests methods */
  75
  76         @Test
  77         @Order(1) // << The poistion pill is not skipped. Hence, this test must run first
  78         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  79         {
  80                 send100Messages(i ->  new Bytes(valueSerializer.serialize(TOPIC, i)));
  81
  82                 await("100 records received")
  83                                 .atMost(Duration.ofSeconds(30))
  84                                 .until(() -> receivedRecords.size() >= 100);
  85
  86                 await("Offsets committed")
  87                                 .atMost(Duration.ofSeconds(10))
  88                                 .untilAsserted(() ->
  89                                 {
  90                                         checkSeenOffsetsForProgress();
  91                                         compareToCommitedOffsets(newOffsets);
  92                                 });
  93
  94                 assertThatExceptionOfType(IllegalStateException.class)
  95                                 .isThrownBy(() -> endlessConsumer.exitStatus())
  96                                 .describedAs("Consumer should still be running");
  97         }
  98
  99         @Test
 100         @Order(2)
 101         void commitsOffsetOfErrorForReprocessingOnError()
 102         {
 103                 send100Messages(counter ->
 104                                 counter == 77
 105                                                 ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
 106                                                 : new Bytes(valueSerializer.serialize(TOPIC, counter)));
 107
 108                 await("Consumer failed")
 109                                 .atMost(Duration.ofSeconds(30))
 110                                 .until(() -> !endlessConsumer.running());
 111
 112                 checkSeenOffsetsForProgress();
 113                 compareToCommitedOffsets(newOffsets);
 114
 115                 endlessConsumer.start();
 116                 await("Consumer failed")
 117                                 .atMost(Duration.ofSeconds(30))
 118                                 .until(() -> !endlessConsumer.running());
 119
 120                 checkSeenOffsetsForProgress();
 121                 compareToCommitedOffsets(newOffsets);
 122                 assertThat(receivedRecords.size())
 123                                 .describedAs("Received not all sent events")
 124                                 .isLessThan(100);
 125
 126                 assertThatNoException()
 127                                 .describedAs("Consumer should not be running")
 128                                 .isThrownBy(() -> endlessConsumer.exitStatus());
 129                 assertThat(endlessConsumer.exitStatus())
 130                                 .describedAs("Consumer should have exited abnormally")
 131                                 .containsInstanceOf(RecordDeserializationException.class);
 132         }
 133
 134
 135         /** Helper methods for the verification of expectations */
 136
 137         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 138         {
 139                 doForCurrentOffsets((tp, offset) ->
 140                 {
 141                         Long expected = offsetsToCheck.get(tp) + 1;
 142                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 143                         assertThat(offset)
 144                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 145                                         .isEqualTo(expected);
 146                 });
 147         }
 148
 149         void checkSeenOffsetsForProgress()
 150         {
 151                 // Be sure, that some messages were consumed...!
 152                 Set<TopicPartition> withProgress = new HashSet<>();
 153                 partitions().forEach(tp ->
 154                 {
 155                         Long oldOffset = oldOffsets.get(tp);
 156                         Long newOffset = newOffsets.get(tp);
 157                         if (!oldOffset.equals(newOffset))
 158                         {
 159                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 160                                 withProgress.add(tp);
 161                         }
 162                 });
 163                 assertThat(withProgress)
 164                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 165                                 .isNotEmpty();
 166         }
 167
 168
 169         /** Helper methods for setting up and running the tests */
 170
 171         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 172         {
 173                 offsetConsumer.assign(partitions());
 174                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 175                 offsetConsumer.unsubscribe();
 176         }
 177
 178         List<TopicPartition> partitions()
 179         {
 180                 return
 181                                 IntStream
 182                                                 .range(0, PARTITIONS)
 183                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 184                                                 .collect(Collectors.toList());
 185         }
 186
 187
 188         void send100Messages(Function<Long, Bytes> messageGenerator)
 189         {
 190                 long i = 0;
 191
 192                 for (int partition = 0; partition < 10; partition++)
 193                 {
 194                         for (int key = 0; key < 10; key++)
 195                         {
 196                                 Bytes value = messageGenerator.apply(++i);
 197
 198                                 ProducerRecord<String, Bytes> record =
 199                                                 new ProducerRecord<>(
 200                                                                 TOPIC,
 201                                                                 partition,
 202                                                                 Integer.toString(key%2),
 203                                                                 value);
 204
 205                                 kafkaProducer.send(record, (metadata, e) ->
 206                                 {
 207                                         if (metadata != null)
 208                                         {
 209                                                 log.debug(
 210                                                                 "{}|{} - {}={}",
 211                                                                 metadata.partition(),
 212                                                                 metadata.offset(),
 213                                                                 record.key(),
 214                                                                 record.value());
 215                                         }
 216                                         else
 217                                         {
 218                                                 log.warn(
 219                                                                 "Exception for {}={}: {}",
 220                                                                 record.key(),
 221                                                                 record.value(),
 222                                                                 e.toString());
 223                                         }
 224                                 });
 225                         }
 226                 }
 227         }
 228
 229
 230         @BeforeEach
 231         public void init()
 232         {
 233                 testHandler = record -> {} ;
 234
 235                 oldOffsets = new HashMap<>();
 236                 newOffsets = new HashMap<>();
 237                 receivedRecords = new HashSet<>();
 238
 239                 doForCurrentOffsets((tp, offset) ->
 240                 {
 241                         oldOffsets.put(tp, offset - 1);
 242                         newOffsets.put(tp, offset - 1);
 243                 });
 244
 245                 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
 246                                 record ->
 247                                 {
 248                                         newOffsets.put(
 249                                                         new TopicPartition(record.topic(), record.partition()),
 250                                                         record.offset());
 251                                         receivedRecords.add(record);
 252                                         testHandler.accept(record);
 253                                 };
 254
 255                 endlessConsumer =
 256                                 new EndlessConsumer<>(
 257                                                 executor,
 258                                                 properties.getClientId(),
 259                                                 properties.getTopic(),
 260                                                 kafkaConsumer,
 261                                                 captureOffsetAndExecuteTestHandler);
 262
 263                 endlessConsumer.start();
 264         }
 265
 266         @AfterEach
 267         public void deinit()
 268         {
 269                 try
 270                 {
 271                         endlessConsumer.stop();
 272                 }
 273                 catch (Exception e)
 274                 {
 275                         log.info("Exception while stopping the consumer: {}", e.toString());
 276                 }
 277         }
 278
 279
 280         @TestConfiguration
 281         @Import(ApplicationConfiguration.class)
 282         public static class Configuration
 283         {
 284                 @Bean
 285                 Serializer<Long> serializer()
 286                 {
 287                         return new LongSerializer();
 288                 }
 289
 290                 @Bean
 291                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 292                 {
 293                         Properties props = new Properties();
 294                         props.put("bootstrap.servers", properties.getBootstrapServer());
 295                         props.put("linger.ms", 100);
 296                         props.put("key.serializer", StringSerializer.class.getName());
 297                         props.put("value.serializer", BytesSerializer.class.getName());
 298
 299                         return new KafkaProducer<>(props);
 300                 }
 301
 302                 @Bean
 303                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 304                 {
 305                         Properties props = new Properties();
 306                         props.put("bootstrap.servers", properties.getBootstrapServer());
 307                         props.put("client.id", "OFFSET-CONSUMER");
 308                         props.put("group.id", properties.getGroupId());
 309                         props.put("key.deserializer", BytesDeserializer.class.getName());
 310                         props.put("value.deserializer", BytesDeserializer.class.getName());
 311
 312                         return new KafkaConsumer<>(props);
 313                 }
 314         }
 315 }