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         RecordHandler recordHandler;
  71
  72         Map<TopicPartition, Long> oldOffsets;
  73         Map<TopicPartition, Long> newOffsets;
  74
  75
  76         /** Tests methods */
  77
  78         @Test
  79         @Order(1) // << The poistion pill is not skipped. Hence, this test must run first
  80         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  81         {
  82                 send100Messages(i ->  new Bytes(longSerializer.serialize(TOPIC, i)));
  83
  84                 Set<ConsumerRecord<String, Long>> received = new HashSet<>();
  85                 recordHandler.testHandler = record -> received.add(record);
  86
  87                 await("100 records received")
  88                                 .atMost(Duration.ofSeconds(30))
  89                                 .until(() -> received.size() >= 100);
  90
  91                 await("Offsets committed")
  92                                 .atMost(Duration.ofSeconds(10))
  93                                 .untilAsserted(() ->
  94                                 {
  95                                         checkSeenOffsetsForProgress();
  96                                         compareToCommitedOffsets(newOffsets);
  97                                 });
  98         }
  99
 100         @Test
 101         @Order(2)
 102         void commitsOffsetOfErrorForReprocessingOnError()
 103         {
 104                 send100Messages(counter ->
 105                                 counter == 77
 106                                                 ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
 107                                                 : new Bytes(longSerializer.serialize(TOPIC, counter)));
 108
 109                 await("Consumer failed")
 110                                 .atMost(Duration.ofSeconds(30))
 111                                 .untilAsserted(() -> checkSeenOffsetsForProgress());
 112
 113                 compareToCommitedOffsets(newOffsets);
 114         }
 115
 116
 117         /** Helper methods for the verification of expectations */
 118
 119         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 120         {
 121                 doForCurrentOffsets((tp, offset) ->
 122                 {
 123                         Long expected = offsetsToCheck.get(tp) + 1;
 124                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 125                         assertThat(offset).isEqualTo(expected);
 126                 });
 127         }
 128
 129         void checkSeenOffsetsForProgress()
 130         {
 131                 // Be sure, that some messages were consumed...!
 132                 Set<TopicPartition> withProgress = new HashSet<>();
 133                 partitions().forEach(tp ->
 134                 {
 135                         Long oldOffset = oldOffsets.get(tp);
 136                         Long newOffset = newOffsets.get(tp);
 137                         if (!oldOffset.equals(newOffset))
 138                         {
 139                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 140                                 withProgress.add(tp);
 141                         }
 142                 });
 143                 assertThat(withProgress).isNotEmpty().describedAs("Found no partitions with any offset-progress");
 144         }
 145
 146
 147         /** Helper methods for setting up and running the tests */
 148
 149         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 150         {
 151                 offsetConsumer.assign(partitions());
 152                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 153                 offsetConsumer.unsubscribe();
 154         }
 155
 156         List<TopicPartition> partitions()
 157         {
 158                 return
 159                                 IntStream
 160                                                 .range(0, PARTITIONS)
 161                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 162                                                 .collect(Collectors.toList());
 163         }
 164
 165
 166         void send100Messages(Function<Long, Bytes> messageGenerator)
 167         {
 168                 long i = 0;
 169
 170                 for (int partition = 0; partition < 10; partition++)
 171                 {
 172                         for (int key = 0; key < 10; key++)
 173                         {
 174                                 Bytes value = messageGenerator.apply(++i);
 175
 176                                 ProducerRecord<String, Bytes> record =
 177                                                 new ProducerRecord<>(
 178                                                                 TOPIC,
 179                                                                 partition,
 180                                                                 Integer.toString(key%2),
 181                                                                 value);
 182
 183                                 kafkaProducer.send(record, (metadata, e) ->
 184                                 {
 185                                         if (metadata != null)
 186                                         {
 187                                                 log.debug(
 188                                                                 "{}|{} - {}={}",
 189                                                                 metadata.partition(),
 190                                                                 metadata.offset(),
 191                                                                 record.key(),
 192                                                                 record.value());
 193                                         }
 194                                         else
 195                                         {
 196                                                 log.warn(
 197                                                                 "Exception for {}={}: {}",
 198                                                                 record.key(),
 199                                                                 record.value(),
 200                                                                 e.toString());
 201                                         }
 202                                 });
 203                         }
 204                 }
 205         }
 206
 207
 208         @BeforeEach
 209         public void init()
 210         {
 211                 recordHandler.testHandler = (record) -> {};
 212
 213                 oldOffsets = new HashMap<>();
 214                 newOffsets = new HashMap<>();
 215
 216                 doForCurrentOffsets((tp, offset) ->
 217                 {
 218                         oldOffsets.put(tp, offset - 1);
 219                         newOffsets.put(tp, offset - 1);
 220                 });
 221
 222                 recordHandler.captureOffsets =
 223                                 record ->
 224                                         newOffsets.put(
 225                                                         new TopicPartition(record.topic(), record.partition()),
 226                                                         record.offset());
 227         }
 228
 229
 230         public static class RecordHandler implements Consumer<ConsumerRecord<String, Long>>
 231         {
 232                 Consumer<ConsumerRecord<String, Long>> captureOffsets;
 233                 Consumer<ConsumerRecord<String, Long>> testHandler;
 234
 235
 236                 @Override
 237                 public void accept(ConsumerRecord<String, Long> record)
 238                 {
 239                         captureOffsets
 240                                         .andThen(testHandler)
 241                                         .accept(record);
 242                 }
 243         }
 244
 245         @TestConfiguration
 246         @Import(ApplicationConfiguration.class)
 247         public static class Configuration
 248         {
 249                 @Primary
 250                 @Bean
 251                 public Consumer<ConsumerRecord<String, Long>> testHandler()
 252                 {
 253                         return new RecordHandler();
 254                 }
 255
 256                 @Bean
 257                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 258                 {
 259                         Properties props = new Properties();
 260                         props.put("bootstrap.servers", properties.getBootstrapServer());
 261                         props.put("linger.ms", 100);
 262                         props.put("key.serializer", StringSerializer.class.getName());
 263                         props.put("value.serializer", BytesSerializer.class.getName());
 264
 265                         return new KafkaProducer<>(props);
 266                 }
 267
 268                 @Bean
 269                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 270                 {
 271                         Properties props = new Properties();
 272                         props.put("bootstrap.servers", properties.getBootstrapServer());
 273                         props.put("client.id", "OFFSET-CONSUMER");
 274                         props.put("group.id", properties.getGroupId());
 275                         props.put("key.deserializer", BytesDeserializer.class.getName());
 276                         props.put("value.deserializer", BytesDeserializer.class.getName());
 277
 278                         return new KafkaConsumer<>(props);
 279                 }
 280         }
 281 }