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                 endlessConsumer.stop();
  88
  89                 checkSeenOffsetsForProgress();
  90                 compareToCommitedOffsets(newOffsets);
  91         }
  92
  93         @Test
  94         @Order(2)
  95         void commitsNoOffsetsOnError()
  96         {
  97                 send100Messages(counter ->
  98                                 counter == 77
  99                                                 ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
 100                                                 : new Bytes(longSerializer.serialize(TOPIC, counter)));
 101
 102                 await("Consumer failed")
 103                                 .atMost(Duration.ofSeconds(30))
 104                                 .until(() -> !endlessConsumer.running());
 105
 106                 checkSeenOffsetsForProgress();
 107                 compareToCommitedOffsets(oldOffsets);
 108         }
 109
 110
 111         void send100Messages(Function<Long, Bytes> messageGenerator)
 112         {
 113                 long i = 0;
 114
 115                 for (int partition = 0; partition < 10; partition++)
 116                 {
 117                         for (int key = 0; key < 10; key++)
 118                         {
 119                                 Bytes value = messageGenerator.apply(++i);
 120
 121                                 ProducerRecord<String, Bytes> record =
 122                                                 new ProducerRecord<>(
 123                                                                 TOPIC,
 124                                                                 partition,
 125                                                                 Integer.toString(key%2),
 126                                                                 value);
 127
 128                                 kafkaProducer.send(record, (metadata, e) ->
 129                                 {
 130                                         if (metadata != null)
 131                                         {
 132                                                 log.debug(
 133                                                                 "{}|{} - {}={}",
 134                                                                 metadata.partition(),
 135                                                                 metadata.offset(),
 136                                                                 record.key(),
 137                                                                 record.value());
 138                                         }
 139                                         else
 140                                         {
 141                                                 log.warn(
 142                                                                 "Exception for {}={}: {}",
 143                                                                 record.key(),
 144                                                                 record.value(),
 145                                                                 e.toString());
 146                                         }
 147                                 });
 148                         }
 149                 }
 150         }
 151
 152         @BeforeEach
 153         public void init()
 154         {
 155                 testHandler = record -> {} ;
 156
 157                 oldOffsets = new HashMap<>();
 158                 newOffsets = new HashMap<>();
 159
 160                 doForCurrentOffsets((tp, offset) ->
 161                 {
 162                         oldOffsets.put(tp, offset - 1);
 163                         newOffsets.put(tp, offset - 1);
 164                 });
 165
 166                 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
 167                                 record ->
 168                                 {
 169                                         newOffsets.put(
 170                                                         new TopicPartition(record.topic(), record.partition()),
 171                                                         record.offset());
 172                                         testHandler.accept(record);
 173                                 };
 174
 175                 endlessConsumer =
 176                                 new EndlessConsumer<>(
 177                                                 executor,
 178                                                 properties.getClientId(),
 179                                                 properties.getTopic(),
 180                                                 kafkaConsumer,
 181                                                 captureOffsetAndExecuteTestHandler);
 182
 183                 endlessConsumer.start();
 184         }
 185
 186         List<TopicPartition> partitions()
 187         {
 188                 return
 189                                 IntStream
 190                                                 .range(0, PARTITIONS)
 191                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 192                                                 .collect(Collectors.toList());
 193         }
 194
 195         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 196         {
 197                 offsetConsumer.assign(partitions());
 198                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 199                 offsetConsumer.unsubscribe();
 200         }
 201
 202         void checkSeenOffsetsForProgress()
 203         {
 204                 // Be sure, that some messages were consumed...!
 205                 Set<TopicPartition> withProgress = new HashSet<>();
 206                 partitions().forEach(tp ->
 207                 {
 208                         Long oldOffset = oldOffsets.get(tp);
 209                         Long newOffset = newOffsets.get(tp);
 210                         if (!oldOffset.equals(newOffset))
 211                         {
 212                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 213                                 withProgress.add(tp);
 214                         }
 215                 });
 216                 assertThat(withProgress).isNotEmpty().describedAs("Found no partitions with any offset-progress");
 217         }
 218
 219         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 220         {
 221                 doForCurrentOffsets((tp, offset) ->
 222                 {
 223                         Long expected = offsetsToCheck.get(tp) + 1;
 224                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 225                         assertThat(offset).isEqualTo(expected);
 226                 });
 227         }
 228
 229
 230         @AfterEach
 231         public void deinit()
 232         {
 233                 try
 234                 {
 235                         endlessConsumer.stop();
 236                 }
 237                 catch (Exception e)
 238                 {
 239                         log.info("Exception while stopping the consumer: {}", e.toString());
 240                 }
 241         }
 242
 243         @TestConfiguration
 244         @Import(ApplicationConfiguration.class)
 245         public static class Configuration
 246         {
 247                 @Bean
 248                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 249                 {
 250                         Properties props = new Properties();
 251                         props.put("bootstrap.servers", properties.getBootstrapServer());
 252                         props.put("linger.ms", 100);
 253                         props.put("key.serializer", StringSerializer.class.getName());
 254                         props.put("value.serializer", BytesSerializer.class.getName());
 255
 256                         return new KafkaProducer<>(props);
 257                 }
 258
 259                 @Bean
 260                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 261                 {
 262                         Properties props = new Properties();
 263                         props.put("bootstrap.servers", properties.getBootstrapServer());
 264                         props.put("client.id", "OFFSET-CONSUMER");
 265                         props.put("group.id", properties.getGroupId());
 266                         props.put("key.deserializer", BytesDeserializer.class.getName());
 267                         props.put("value.deserializer", BytesDeserializer.class.getName());
 268
 269                         return new KafkaConsumer<>(props);
 270                 }
 271         }
 272 }