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131
canary/src/test/java/io/littlehorse/canary/aggregator/internal/MetricStoreExporterTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| 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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