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.*;
  11 import org.apache.kafka.common.utils.Bytes;
  12 import org.junit.jupiter.api.*;
  13 import org.springframework.beans.factory.annotation.Autowired;
  14 import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer;
  15 import org.springframework.boot.test.context.TestConfiguration;
  16 import org.springframework.context.annotation.Bean;
  17 import org.springframework.context.annotation.Import;
  18 import org.springframework.kafka.support.serializer.JsonSerializer;
  19 import org.springframework.kafka.test.context.EmbeddedKafka;
  20 import org.springframework.test.context.TestPropertySource;
  21 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  22
  23 import java.time.Duration;
  24 import java.util.*;
  25 import java.util.concurrent.ExecutionException;
  26 import java.util.concurrent.ExecutorService;
  27 import java.util.function.BiConsumer;
  28 import java.util.function.BiFunction;
  29 import java.util.function.Consumer;
  30 import java.util.stream.Collectors;
  31 import java.util.stream.IntStream;
  32
  33 import static de.juplo.kafka.ApplicationTests.PARTITIONS;
  34 import static de.juplo.kafka.ApplicationTests.TOPIC;
  35 import static org.assertj.core.api.Assertions.*;
  36 import static org.awaitility.Awaitility.*;
  37
  38
  39 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  40 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  41 @TestPropertySource(
  42                 properties = {
  43                                 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
  44                                 "consumer.topic=" + TOPIC })
  45 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  46 @Slf4j
  47 class ApplicationTests
  48 {
  49         public static final String TOPIC = "FOO";
  50         public static final int PARTITIONS = 10;
  51
  52
  53         StringSerializer stringSerializer = new StringSerializer();
  54
  55         @Autowired
  56         Serializer valueSerializer;
  57         @Autowired
  58         KafkaProducer<String, Bytes> kafkaProducer;
  59         @Autowired
  60         KafkaConsumer<String, ClientMessage> kafkaConsumer;
  61         @Autowired
  62         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  63         @Autowired
  64         ApplicationProperties properties;
  65         @Autowired
  66         ExecutorService executor;
  67
  68         Consumer<ConsumerRecord<String, ClientMessage>> testHandler;
  69         EndlessConsumer<String, ClientMessage> endlessConsumer;
  70         Map<TopicPartition, Long> oldOffsets;
  71         Map<TopicPartition, Long> newOffsets;
  72         Set<ConsumerRecord<String, ClientMessage>> receivedRecords;
  73
  74
  75         /** Tests methods */
  76
  77         @Test
  78         @Order(1) // << The poistion pill is not skipped. Hence, this test must run first
  79         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  80         {
  81                 send100Messages((key, counter) -> serialize(key, counter));
  82
  83                 await("100 records received")
  84                                 .atMost(Duration.ofSeconds(30))
  85                                 .until(() -> receivedRecords.size() >= 100);
  86
  87                 await("Offsets committed")
  88                                 .atMost(Duration.ofSeconds(10))
  89                                 .untilAsserted(() ->
  90                                 {
  91                                         checkSeenOffsetsForProgress();
  92                                         compareToCommitedOffsets(newOffsets);
  93                                 });
  94
  95                 assertThatExceptionOfType(IllegalStateException.class)
  96                                 .isThrownBy(() -> endlessConsumer.exitStatus())
  97                                 .describedAs("Consumer should still be running");
  98         }
  99
 100         @Test
 101         @Order(2)
 102         void commitsOffsetOfErrorForReprocessingOnError()
 103         {
 104                 send100Messages((key, counter) ->
 105                                 counter == 77
 106                                                 ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
 107                                                 : serialize(key, counter));
 108
 109                 await("Consumer failed")
 110                                 .atMost(Duration.ofSeconds(30))
 111                                 .until(() -> !endlessConsumer.running());
 112
 113                 checkSeenOffsetsForProgress();
 114                 compareToCommitedOffsets(newOffsets);
 115
 116                 endlessConsumer.start();
 117                 await("Consumer failed")
 118                                 .atMost(Duration.ofSeconds(30))
 119                                 .until(() -> !endlessConsumer.running());
 120
 121                 checkSeenOffsetsForProgress();
 122                 compareToCommitedOffsets(newOffsets);
 123                 assertThat(receivedRecords.size())
 124                                 .describedAs("Received not all sent events")
 125                                 .isLessThan(100);
 126
 127                 assertThatNoException()
 128                                 .describedAs("Consumer should not be running")
 129                                 .isThrownBy(() -> endlessConsumer.exitStatus());
 130                 assertThat(endlessConsumer.exitStatus())
 131                                 .describedAs("Consumer should have exited abnormally")
 132                                 .containsInstanceOf(RecordDeserializationException.class);
 133         }
 134
 135
 136         /** Helper methods for the verification of expectations */
 137
 138         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 139         {
 140                 doForCurrentOffsets((tp, offset) ->
 141                 {
 142                         Long expected = offsetsToCheck.get(tp) + 1;
 143                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 144                         assertThat(offset)
 145                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 146                                         .isEqualTo(expected);
 147                 });
 148         }
 149
 150         void checkSeenOffsetsForProgress()
 151         {
 152                 // Be sure, that some messages were consumed...!
 153                 Set<TopicPartition> withProgress = new HashSet<>();
 154                 partitions().forEach(tp ->
 155                 {
 156                         Long oldOffset = oldOffsets.get(tp);
 157                         Long newOffset = newOffsets.get(tp);
 158                         if (!oldOffset.equals(newOffset))
 159                         {
 160                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 161                                 withProgress.add(tp);
 162                         }
 163                 });
 164                 assertThat(withProgress)
 165                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 166                                 .isNotEmpty();
 167         }
 168
 169
 170         /** Helper methods for setting up and running the tests */
 171
 172         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 173         {
 174                 offsetConsumer.assign(partitions());
 175                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 176                 offsetConsumer.unsubscribe();
 177         }
 178
 179         List<TopicPartition> partitions()
 180         {
 181                 return
 182                                 IntStream
 183                                                 .range(0, PARTITIONS)
 184                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 185                                                 .collect(Collectors.toList());
 186         }
 187
 188
 189         void send100Messages(BiFunction<Integer, Long, Bytes> messageGenerator)
 190         {
 191                 long i = 0;
 192
 193                 for (int partition = 0; partition < 10; partition++)
 194                 {
 195                         for (int key = 0; key < 10; key++)
 196                         {
 197                                 Bytes value = messageGenerator.apply(key, ++i);
 198
 199                                 ProducerRecord<String, Bytes> record =
 200                                                 new ProducerRecord<>(
 201                                                                 TOPIC,
 202                                                                 partition,
 203                                                                 Integer.toString(key%2),
 204                                                                 value);
 205
 206                                 kafkaProducer.send(record, (metadata, e) ->
 207                                 {
 208                                         if (metadata != null)
 209                                         {
 210                                                 log.debug(
 211                                                                 "{}|{} - {}={}",
 212                                                                 metadata.partition(),
 213                                                                 metadata.offset(),
 214                                                                 record.key(),
 215                                                                 record.value());
 216                                         }
 217                                         else
 218                                         {
 219                                                 log.warn(
 220                                                                 "Exception for {}={}: {}",
 221                                                                 record.key(),
 222                                                                 record.value(),
 223                                                                 e.toString());
 224                                         }
 225                                 });
 226                         }
 227                 }
 228         }
 229
 230         Bytes serialize(Integer key, Long value)
 231         {
 232                 ClientMessage message = new ClientMessage();
 233                 message.setClient(key.toString());
 234                 message.setMessage(value.toString());
 235                 return new Bytes(valueSerializer.serialize(TOPIC, message));
 236         }
 237
 238
 239         @BeforeEach
 240         public void init()
 241         {
 242                 testHandler = record -> {} ;
 243
 244                 oldOffsets = new HashMap<>();
 245                 newOffsets = new HashMap<>();
 246                 receivedRecords = new HashSet<>();
 247
 248                 doForCurrentOffsets((tp, offset) ->
 249                 {
 250                         oldOffsets.put(tp, offset - 1);
 251                         newOffsets.put(tp, offset - 1);
 252                 });
 253
 254                 Consumer<ConsumerRecord<String, ClientMessage>> captureOffsetAndExecuteTestHandler =
 255                                 record ->
 256                                 {
 257                                         newOffsets.put(
 258                                                         new TopicPartition(record.topic(), record.partition()),
 259                                                         record.offset());
 260                                         receivedRecords.add(record);
 261                                         testHandler.accept(record);
 262                                 };
 263
 264                 endlessConsumer =
 265                                 new EndlessConsumer<>(
 266                                                 executor,
 267                                                 properties.getClientId(),
 268                                                 properties.getTopic(),
 269                                                 kafkaConsumer,
 270                                                 captureOffsetAndExecuteTestHandler);
 271
 272                 endlessConsumer.start();
 273         }
 274
 275         @AfterEach
 276         public void deinit()
 277         {
 278                 try
 279                 {
 280                         endlessConsumer.stop();
 281                 }
 282                 catch (Exception e)
 283                 {
 284                         log.info("Exception while stopping the consumer: {}", e.toString());
 285                 }
 286         }
 287
 288
 289         @TestConfiguration
 290         @Import(ApplicationConfiguration.class)
 291         public static class Configuration
 292         {
 293                 @Bean
 294                 Serializer<ClientMessage> serializer()
 295                 {
 296                         return new JsonSerializer<>();
 297                 }
 298
 299                 @Bean
 300                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 301                 {
 302                         Properties props = new Properties();
 303                         props.put("bootstrap.servers", properties.getBootstrapServer());
 304                         props.put("linger.ms", 100);
 305                         props.put("key.serializer", StringSerializer.class.getName());
 306                         props.put("value.serializer", BytesSerializer.class.getName());
 307
 308                         return new KafkaProducer<>(props);
 309                 }
 310
 311                 @Bean
 312                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 313                 {
 314                         Properties props = new Properties();
 315                         props.put("bootstrap.servers", properties.getBootstrapServer());
 316                         props.put("client.id", "OFFSET-CONSUMER");
 317                         props.put("group.id", properties.getGroupId());
 318                         props.put("key.deserializer", BytesDeserializer.class.getName());
 319                         props.put("value.deserializer", BytesDeserializer.class.getName());
 320
 321                         return new KafkaConsumer<>(props);
 322                 }
 323         }
 324 }