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