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ServletJakartaExporterWebXmlIT.java
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ServletJakartaExporterWebXmlIT.java
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package io.prometheus.client.it.servlet.jakarta;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.testcontainers.containers.GenericContainer;
import org.testcontainers.containers.wait.strategy.Wait;
import org.testcontainers.images.builder.ImageFromDockerfile;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.List;
public class ServletJakartaExporterWebXmlIT {
private final OkHttpClient client = new OkHttpClient();
private static class DockerContainer extends GenericContainer<DockerContainer> {
DockerContainer() {
super(new ImageFromDockerfile("servlet-jakarta-exporter-webxml")
.withFileFromPath("servlet_jakarta_exporter_webxml.war", Paths.get("target/servlet_jakarta_exporter_webxml.war"))
.withFileFromClasspath("Dockerfile", "Dockerfile"));
}
}
@Rule
public DockerContainer dockerContainer = new DockerContainer()
.withExposedPorts(8080)
.waitingFor(Wait.forLogMessage(".*oejs.Server:main: Started Server.*", 1));
@Test
public void testSampleNameFilter() throws IOException, InterruptedException {
callExampleServlet();
List<String> metrics = scrapeMetrics();
assertContains(metrics, "requests_bucket");
assertContains(metrics, "requests_count");
assertContains(metrics, "requests_sum");
assertContains(metrics, "requests_created");
assertContains(metrics, "requests_status_total");
assertContains(metrics, "requests_status_created");
assertContains(metrics, "jvm_gc_collection_seconds_count");
assertNotContains(metrics, "jvm_threads_deadlocked");
assertNotContains(metrics, "jvm_memory_pool");
List<String> filteredMetrics = scrapeMetricsWithNameFilter("requests_count", "requests_sum");
assertNotContains(filteredMetrics, "requests_bucket");
assertContains(filteredMetrics, "requests_count");
assertContains(filteredMetrics, "requests_sum");
assertNotContains(filteredMetrics, "requests_created");
assertNotContains(filteredMetrics, "requests_status_total");
assertNotContains(filteredMetrics, "requests_status_created");
assertNotContains(filteredMetrics, "jvm_gc_collection_seconds_count");
assertNotContains(filteredMetrics, "jvm_threads_deadlocked");
assertNotContains(filteredMetrics, "jvm_memory_pool");
}
private void assertContains(List<String> metrics, String prefix) {
for (String metric : metrics) {
if (metric.startsWith(prefix)) {
return;
}
}
Assert.fail("metric not found: " + prefix);
}
private void assertNotContains(List<String> metrics, String prefix) {
for (String metric : metrics) {
if (metric.startsWith(prefix)) {
Assert.fail("unexpected metric found: " + metric);
}
}
}
private void callExampleServlet() throws IOException {
Request request = new Request.Builder()
.url("http://localhost:" + dockerContainer.getMappedPort(8080) + "/hello")
.build();
try (Response response = client.newCall(request).execute()) {
Assert.assertEquals("Hello, world!\n", response.body().string());
}
}
private List<String> scrapeMetrics() throws IOException {
Request request = new Request.Builder()
.url("http://localhost:" + dockerContainer.getMappedPort(8080) + "/metrics")
.header("Accept", "application/openmetrics-text; version=1.0.0; charset=utf-8")
.build();
try (Response response = client.newCall(request).execute()) {
return Arrays.asList(response.body().string().split("\\n"));
}
}
private List<String> scrapeMetricsWithNameFilter(String... names) throws IOException {
StringBuilder param = new StringBuilder();
boolean first = true;
for (String name : names) {
if (!first) {
param.append("&");
}
param.append("name[]=").append(name);
first = false;
}
Request request = new Request.Builder()
.url("http://localhost:" + dockerContainer.getMappedPort(8080) + "/metrics?" + param)
.header("Accept", "application/openmetrics-text; version=1.0.0; charset=utf-8")
.build();
try (Response response = client.newCall(request).execute()) {
return Arrays.asList(response.body().string().split("\\n"));
}
}
}