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JettyConnectionMetrics connection type detection
The `HttpConnection` class was relocated to a different package in Jetty 12 which was causing a `NoClassDefFoundError` when doing an instanceof check on it. The goal of it is to determine whether the connection instrumented is a server connection or a client connection. However, it specifically checks against `HttpConnection` and assumes that all server connections will be an instanceof `HttpConnection` and any not an instanceof it are client connections. This is brittle because Jetty supports more implementations of `Connection` on the server side than `HttpConnection` and there could in theory be an arbitrary implementation where we do not know whether it is a server or client connection (it could also be neither). This instead checks whether the package name contains `server` or `client` or neither. This is admittedly also brittle, but given the known implementations of `Connection` provided by the Jetty project, this pattern generally seems to hold, and it is at least more honest using `UNKNOWN` when our heuristic fails. It also avoids the `NoClassDefFoundError` when using `JettyConnectionMetrics` with Jetty 12. Resolves micrometer-metricsgh-4324
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| plugins { | ||
| id 'java' | ||
| } | ||
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| dependencies { | ||
| implementation project(":micrometer-core") | ||
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| testImplementation libs.jetty12Server | ||
| testImplementation libs.jetty12Client | ||
| testImplementation libs.httpcomponents.client | ||
| testImplementation libs.junitJupiter | ||
| testImplementation libs.assertj | ||
| } |
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...mples-jetty12/src/test/java/io.micrometer.samples.jetty12/JettyConnectionMetricsTest.java
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| /* | ||
| * Copyright 2023 VMware, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package io.micrometer.samples.jetty12; | ||
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| import io.micrometer.core.instrument.MockClock; | ||
| import io.micrometer.core.instrument.binder.jetty.JettyConnectionMetrics; | ||
| import io.micrometer.core.instrument.simple.SimpleConfig; | ||
| import io.micrometer.core.instrument.simple.SimpleMeterRegistry; | ||
| import org.apache.http.client.methods.CloseableHttpResponse; | ||
| import org.apache.http.client.methods.HttpPost; | ||
| import org.apache.http.entity.StringEntity; | ||
| import org.apache.http.impl.client.CloseableHttpClient; | ||
| import org.apache.http.impl.client.HttpClients; | ||
| import org.eclipse.jetty.client.HttpClient; | ||
| import org.eclipse.jetty.client.Request; | ||
| import org.eclipse.jetty.client.StringRequestContent; | ||
| import org.eclipse.jetty.server.Connector; | ||
| import org.eclipse.jetty.server.Server; | ||
| import org.eclipse.jetty.server.ServerConnector; | ||
| import org.eclipse.jetty.util.component.LifeCycle; | ||
| import org.junit.jupiter.api.AfterEach; | ||
| import org.junit.jupiter.api.Test; | ||
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| import java.util.concurrent.CountDownLatch; | ||
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| import static java.util.concurrent.TimeUnit.SECONDS; | ||
| import static org.assertj.core.api.Assertions.assertThat; | ||
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| class JettyConnectionMetricsTest { | ||
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| private SimpleMeterRegistry registry = new SimpleMeterRegistry(SimpleConfig.DEFAULT, new MockClock()); | ||
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| private Server server = new Server(0); | ||
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| private ServerConnector connector = new ServerConnector(server); | ||
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| private CloseableHttpClient client = HttpClients.createDefault(); | ||
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| void setup() throws Exception { | ||
| connector.addBean(new JettyConnectionMetrics(registry)); | ||
| server.setConnectors(new Connector[] { connector }); | ||
| server.start(); | ||
| } | ||
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| @AfterEach | ||
| void teardown() throws Exception { | ||
| if (server.isRunning()) { | ||
| server.stop(); | ||
| } | ||
| } | ||
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| @Test | ||
| void contributesServerConnectorMetrics() throws Exception { | ||
| setup(); | ||
| HttpPost post = new HttpPost("http://localhost:" + connector.getLocalPort()); | ||
| post.setEntity(new StringEntity("123456")); | ||
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| try (CloseableHttpResponse ignored = client.execute(post)) { | ||
| try (CloseableHttpResponse ignored2 = client.execute(post)) { | ||
| assertThat(registry.get("jetty.connections.current").gauge().value()).isEqualTo(2.0); | ||
| assertThat(registry.get("jetty.connections.max").gauge().value()).isEqualTo(2.0); | ||
| } | ||
| } | ||
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| CountDownLatch latch = new CountDownLatch(1); | ||
| connector.addEventListener(new LifeCycle.Listener() { | ||
| @Override | ||
| public void lifeCycleStopped(LifeCycle event) { | ||
| latch.countDown(); | ||
| } | ||
| }); | ||
| // Convenient way to get Jetty to flush its connections, which is required to | ||
| // update the sent/received bytes metrics | ||
| server.stop(); | ||
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| assertThat(latch.await(10, SECONDS)).isTrue(); | ||
| assertThat(registry.get("jetty.connections.max").gauge().value()).isEqualTo(2.0); | ||
| assertThat(registry.get("jetty.connections.request").tag("type", "server").timer().count()).isEqualTo(2); | ||
| assertThat(registry.get("jetty.connections.bytes.in").summary().totalAmount()).isGreaterThan(1); | ||
| } | ||
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| @Test | ||
| void contributesClientConnectorMetrics() throws Exception { | ||
| setup(); | ||
| HttpClient httpClient = new HttpClient(); | ||
| httpClient.setFollowRedirects(false); | ||
| httpClient.addBean(new JettyConnectionMetrics(registry)); | ||
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| CountDownLatch latch = new CountDownLatch(1); | ||
| httpClient.addEventListener(new LifeCycle.Listener() { | ||
| @Override | ||
| public void lifeCycleStopped(LifeCycle event) { | ||
| latch.countDown(); | ||
| } | ||
| }); | ||
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| httpClient.start(); | ||
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| Request post = httpClient.POST("http://localhost:" + connector.getLocalPort()); | ||
| post.body(new StringRequestContent("123456")); | ||
| post.send(); | ||
| httpClient.stop(); | ||
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| assertThat(latch.await(10, SECONDS)).isTrue(); | ||
| assertThat(registry.get("jetty.connections.max").gauge().value()).isEqualTo(1.0); | ||
| assertThat(registry.get("jetty.connections.request").tag("type", "client").timer().count()).isEqualTo(1); | ||
| assertThat(registry.get("jetty.connections.bytes.out").summary().totalAmount()).isGreaterThan(1); | ||
| } | ||
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| @Test | ||
| void passingConnectorAddsConnectorNameTag() { | ||
| new JettyConnectionMetrics(registry, connector); | ||
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| assertThat(registry.get("jetty.connections.messages.in").counter().getId().getTag("connector.name")) | ||
| .isEqualTo("unnamed"); | ||
| } | ||
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| @Test | ||
| void namedConnectorsGetTaggedWithName() { | ||
| connector.setName("super-fast-connector"); | ||
| new JettyConnectionMetrics(registry, connector); | ||
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| assertThat(registry.get("jetty.connections.messages.in").counter().getId().getTag("connector.name")) | ||
| .isEqualTo("super-fast-connector"); | ||
| } | ||
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| } |
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