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