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.serialization.BytesDeserializer;
  10 import org.apache.kafka.common.serialization.BytesSerializer;
  11 import org.apache.kafka.common.serialization.LongSerializer;
  12 import org.apache.kafka.common.serialization.StringSerializer;
  13 import org.apache.kafka.common.utils.Bytes;
  14 import org.junit.jupiter.api.*;
  15 import org.springframework.beans.factory.annotation.Autowired;
  16 import org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration;
  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.context.annotation.Primary;
  22 import org.springframework.kafka.test.context.EmbeddedKafka;
  23 import org.springframework.test.context.TestPropertySource;
  24 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  25
  26 import java.time.Duration;
  27 import java.util.*;
  28 import java.util.concurrent.ExecutionException;
  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
  40
  41 @SpringJUnitConfig(
  42                 initializers = ConfigDataApplicationContextInitializer.class,
  43     classes = {
  44                                 EndlessConsumer.class,
  45                                 KafkaAutoConfiguration.class,
  46                                 ApplicationTests.Configuration.class })
  47 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  48 @TestPropertySource(
  49                 properties = {
  50                                 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
  51                                 "consumer.topic=" + TOPIC })
  52 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  53 @Slf4j
  54 class ApplicationTests
  55 {
  56         public static final String TOPIC = "FOO";
  57         public static final int PARTITIONS = 10;
  58
  59
  60         StringSerializer stringSerializer = new StringSerializer();
  61         LongSerializer longSerializer = new LongSerializer();
  62
  63         @Autowired
  64         KafkaProducer<String, Bytes> kafkaProducer;
  65         @Autowired
  66         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  67         @Autowired
  68         ApplicationProperties properties;
  69         @Autowired
  70         EndlessConsumer endlessConsumer;
  71         @Autowired
  72         RecordHandler recordHandler;
  73
  74         Map<TopicPartition, Long> oldOffsets;
  75         Map<TopicPartition, Long> newOffsets;
  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                 Set<ConsumerRecord<String, Long>> received = new HashSet<>();
  87                 recordHandler.testHandler = record -> received.add(record);
  88
  89                 await("100 records received")
  90                                 .atMost(Duration.ofSeconds(30))
  91                                 .until(() -> received.size() >= 100);
  92
  93                 await("Offsets committed")
  94                                 .atMost(Duration.ofSeconds(10))
  95                                 .untilAsserted(() ->
  96                                 {
  97                                         checkSeenOffsetsForProgress();
  98                                         compareToCommitedOffsets(newOffsets);
  99                                 });
 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(longSerializer.serialize(TOPIC, counter)));
 110
 111                 await("Consumer failed")
 112                                 .atMost(Duration.ofSeconds(30))
 113                                 .untilAsserted(() -> checkSeenOffsetsForProgress());
 114
 115                 compareToCommitedOffsets(newOffsets);
 116         }
 117
 118
 119         /** Helper methods for the verification of expectations */
 120
 121         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 122         {
 123                 doForCurrentOffsets((tp, offset) ->
 124                 {
 125                         Long expected = offsetsToCheck.get(tp) + 1;
 126                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 127                         assertThat(offset).isEqualTo(expected);
 128                 });
 129         }
 130
 131         void checkSeenOffsetsForProgress()
 132         {
 133                 // Be sure, that some messages were consumed...!
 134                 Set<TopicPartition> withProgress = new HashSet<>();
 135                 partitions().forEach(tp ->
 136                 {
 137                         Long oldOffset = oldOffsets.get(tp);
 138                         Long newOffset = newOffsets.get(tp);
 139                         if (!oldOffset.equals(newOffset))
 140                         {
 141                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 142                                 withProgress.add(tp);
 143                         }
 144                 });
 145                 assertThat(withProgress).isNotEmpty().describedAs("Found no partitions with any offset-progress");
 146         }
 147
 148
 149         /** Helper methods for setting up and running the tests */
 150
 151         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 152         {
 153                 offsetConsumer.assign(partitions());
 154                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 155                 offsetConsumer.unsubscribe();
 156         }
 157
 158         List<TopicPartition> partitions()
 159         {
 160                 return
 161                                 IntStream
 162                                                 .range(0, PARTITIONS)
 163                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 164                                                 .collect(Collectors.toList());
 165         }
 166
 167
 168         void send100Messages(Function<Long, Bytes> messageGenerator)
 169         {
 170                 long i = 0;
 171
 172                 for (int partition = 0; partition < 10; partition++)
 173                 {
 174                         for (int key = 0; key < 10; key++)
 175                         {
 176                                 Bytes value = messageGenerator.apply(++i);
 177
 178                                 ProducerRecord<String, Bytes> record =
 179                                                 new ProducerRecord<>(
 180                                                                 TOPIC,
 181                                                                 partition,
 182                                                                 Integer.toString(key%2),
 183                                                                 value);
 184
 185                                 kafkaProducer.send(record, (metadata, e) ->
 186                                 {
 187                                         if (metadata != null)
 188                                         {
 189                                                 log.debug(
 190                                                                 "{}|{} - {}={}",
 191                                                                 metadata.partition(),
 192                                                                 metadata.offset(),
 193                                                                 record.key(),
 194                                                                 record.value());
 195                                         }
 196                                         else
 197                                         {
 198                                                 log.warn(
 199                                                                 "Exception for {}={}: {}",
 200                                                                 record.key(),
 201                                                                 record.value(),
 202                                                                 e.toString());
 203                                         }
 204                                 });
 205                         }
 206                 }
 207         }
 208
 209
 210         @BeforeEach
 211         public void init()
 212         {
 213                 recordHandler.testHandler = (record) -> {};
 214
 215                 oldOffsets = new HashMap<>();
 216                 newOffsets = new HashMap<>();
 217
 218                 doForCurrentOffsets((tp, offset) ->
 219                 {
 220                         oldOffsets.put(tp, offset - 1);
 221                         newOffsets.put(tp, offset - 1);
 222                 });
 223
 224                 recordHandler.captureOffsets =
 225                                 record ->
 226                                         newOffsets.put(
 227                                                         new TopicPartition(record.topic(), record.partition()),
 228                                                         record.offset());
 229
 230                 endlessConsumer.start();
 231         }
 232
 233         @AfterEach
 234         public void deinit()
 235         {
 236                 try
 237                 {
 238                         endlessConsumer.stop();
 239                 }
 240                 catch (Exception e)
 241                 {
 242                         log.info("Exception while stopping the consumer: {}", e.toString());
 243                 }
 244         }
 245
 246         public static class RecordHandler implements Consumer<ConsumerRecord<String, Long>>
 247         {
 248                 Consumer<ConsumerRecord<String, Long>> captureOffsets;
 249                 Consumer<ConsumerRecord<String, Long>> testHandler;
 250
 251
 252                 @Override
 253                 public void accept(ConsumerRecord<String, Long> record)
 254                 {
 255                         captureOffsets
 256                                         .andThen(testHandler)
 257                                         .accept(record);
 258                 }
 259         }
 260
 261         @TestConfiguration
 262         @Import(ApplicationConfiguration.class)
 263         public static class Configuration
 264         {
 265                 @Primary
 266                 @Bean
 267                 public Consumer<ConsumerRecord<String, Long>> testHandler()
 268                 {
 269                         return new RecordHandler();
 270                 }
 271
 272                 @Bean
 273                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 274                 {
 275                         Properties props = new Properties();
 276                         props.put("bootstrap.servers", properties.getBootstrapServer());
 277                         props.put("linger.ms", 100);
 278                         props.put("key.serializer", StringSerializer.class.getName());
 279                         props.put("value.serializer", BytesSerializer.class.getName());
 280
 281                         return new KafkaProducer<>(props);
 282                 }
 283
 284                 @Bean
 285                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 286                 {
 287                         Properties props = new Properties();
 288                         props.put("bootstrap.servers", properties.getBootstrapServer());
 289                         props.put("client.id", "OFFSET-CONSUMER");
 290                         props.put("group.id", properties.getGroupId());
 291                         props.put("key.deserializer", BytesDeserializer.class.getName());
 292                         props.put("value.deserializer", BytesDeserializer.class.getName());
 293
 294                         return new KafkaConsumer<>(props);
 295                 }
 296         }
 297 }