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131
canary/src/test/java/io/littlehorse/canary/aggregator/internal/MetricStoreExporterTest.java
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package io.littlehorse.canary.aggregator.internal; | ||
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import static org.assertj.core.api.Assertions.assertThat; | ||
import static org.mockito.ArgumentMatchers.any; | ||
import static org.mockito.Mockito.doNothing; | ||
import static org.mockito.Mockito.when; | ||
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import io.littlehorse.canary.proto.MetricKey; | ||
import io.littlehorse.canary.proto.MetricValue; | ||
import io.littlehorse.canary.proto.Tag; | ||
import io.micrometer.prometheusmetrics.PrometheusConfig; | ||
import io.micrometer.prometheusmetrics.PrometheusMeterRegistry; | ||
import java.time.Duration; | ||
import java.util.List; | ||
import org.apache.kafka.streams.KafkaStreams; | ||
import org.apache.kafka.streams.KeyValue; | ||
import org.apache.kafka.streams.state.KeyValueIterator; | ||
import org.apache.kafka.streams.state.ReadOnlyKeyValueStore; | ||
import org.junit.jupiter.api.AfterEach; | ||
import org.junit.jupiter.api.BeforeEach; | ||
import org.junit.jupiter.api.Test; | ||
import org.junit.jupiter.api.extension.ExtendWith; | ||
import org.mockito.Mock; | ||
import org.mockito.junit.jupiter.MockitoExtension; | ||
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@ExtendWith(MockitoExtension.class) | ||
class MetricStoreExporterTest { | ||
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public static final String TEST_STORAGE = "testStorage"; | ||
public static final String HOST = "localhost"; | ||
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@Mock | ||
KafkaStreams kafkaStreams; | ||
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@Mock | ||
ReadOnlyKeyValueStore<MetricKey, MetricValue> store; | ||
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@Mock | ||
KeyValueIterator<MetricKey, MetricValue> records; | ||
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PrometheusMeterRegistry prometheusRegistry; | ||
MetricStoreExporter metricExporter; | ||
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@BeforeEach | ||
void setUp() { | ||
metricExporter = new MetricStoreExporter(kafkaStreams, TEST_STORAGE, Duration.ofSeconds(10)); | ||
prometheusRegistry = new PrometheusMeterRegistry(PrometheusConfig.DEFAULT); | ||
} | ||
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@AfterEach | ||
void tearDown() throws InterruptedException { | ||
metricExporter.close(); | ||
prometheusRegistry.close(); | ||
} | ||
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@Test | ||
public void shouldScrapeSimpleMetric() throws InterruptedException { | ||
// metrics | ||
MetricKey key = createMetricsKey(List.of( | ||
Tag.newBuilder().setKey("custom_tag").setValue("custom_value").build())); | ||
MetricKey key2 = createMetricsKey(List.of()); | ||
MetricValue value = MetricValue.newBuilder().setValue(1.0).build(); | ||
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// records | ||
when(records.hasNext()).thenReturn(true, false); | ||
when(records.next()).thenReturn(KeyValue.pair(key, value)); | ||
doNothing().when(records).close(); | ||
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// store | ||
when(store.all()).thenReturn(records); | ||
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// kafka streams | ||
when(kafkaStreams.state()).thenReturn(KafkaStreams.State.RUNNING); | ||
when(kafkaStreams.store(any())).thenReturn(store); | ||
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metricExporter.bindTo(prometheusRegistry); | ||
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Thread.sleep(500); | ||
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assertThat(prometheusRegistry.scrape()) | ||
.contains( | ||
"my_metric{custom_tag=\"custom_value\",server=\"localhost:2023\",server_id=\"my_server\",server_version=\"test\"} 1.0"); | ||
} | ||
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private static MetricKey createMetricsKey(List<Tag> tags) { | ||
return createMetricsKey(HOST, tags); | ||
} | ||
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private static MetricKey createMetricsKey(String host, List<Tag> tags) { | ||
return MetricKey.newBuilder() | ||
.setServerHost(host) | ||
.setServerPort(2023) | ||
.setServerVersion("test") | ||
.setId("my_metric") | ||
.setServerId("my_server") | ||
.addAllTags(tags) | ||
.build(); | ||
} | ||
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@Test | ||
void printMetricsWithTwoDifferentServers() throws InterruptedException { | ||
// metrics | ||
List<Tag> tags = List.of( | ||
Tag.newBuilder().setKey("custom_tag").setValue("custom_value").build()); | ||
MetricKey key1 = createMetricsKey(tags); | ||
MetricKey key2 = createMetricsKey("localhost2", tags); | ||
MetricValue value = MetricValue.newBuilder().setValue(1.0).build(); | ||
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// records | ||
when(records.hasNext()).thenReturn(true, true, false); | ||
when(records.next()).thenReturn(KeyValue.pair(key1, value), KeyValue.pair(key2, value)); | ||
doNothing().when(records).close(); | ||
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// store | ||
when(store.all()).thenReturn(records); | ||
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// kafka streams | ||
when(kafkaStreams.state()).thenReturn(KafkaStreams.State.RUNNING); | ||
when(kafkaStreams.store(any())).thenReturn(store); | ||
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metricExporter.bindTo(prometheusRegistry); | ||
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Thread.sleep(500); | ||
System.out.printf(prometheusRegistry.scrape()); | ||
assertThat(prometheusRegistry.scrape()) | ||
.isEqualTo( | ||
"# HELP my_metric \n" + "# TYPE my_metric gauge\n" | ||
+ "my_metric{custom_tag=\"custom_value\",server=\"localhost2:2023\",server_id=\"my_server\",server_version=\"test\"} 1.0\n" | ||
+ "my_metric{custom_tag=\"custom_value\",server=\"localhost:2023\",server_id=\"my_server\",server_version=\"test\"} 1.0\n"); | ||
} | ||
} |
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