| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 |
| * |
| * http://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 org.apache.pulsar.broker.stats.prometheus; |
| |
| import static org.apache.bookkeeper.mledger.util.SafeRun.safeRun; |
| import io.netty.util.concurrent.DefaultThreadFactory; |
| import java.io.IOException; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import javax.servlet.AsyncContext; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import org.apache.pulsar.broker.PulsarService; |
| import org.eclipse.jetty.http.HttpStatus; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class PrometheusMetricsServlet extends HttpServlet { |
| |
| private static final long serialVersionUID = 1L; |
| |
| private final PulsarService pulsar; |
| private final boolean shouldExportTopicMetrics; |
| private final boolean shouldExportConsumerMetrics; |
| private final boolean shouldExportProducerMetrics; |
| private final long metricsServletTimeoutMs; |
| private final boolean splitTopicAndPartitionLabel; |
| private List<PrometheusRawMetricsProvider> metricsProviders; |
| |
| private ExecutorService executor = null; |
| |
| public PrometheusMetricsServlet(PulsarService pulsar, boolean includeTopicMetrics, boolean includeConsumerMetrics, |
| boolean shouldExportProducerMetrics, boolean splitTopicAndPartitionLabel) { |
| this.pulsar = pulsar; |
| this.shouldExportTopicMetrics = includeTopicMetrics; |
| this.shouldExportConsumerMetrics = includeConsumerMetrics; |
| this.shouldExportProducerMetrics = shouldExportProducerMetrics; |
| this.metricsServletTimeoutMs = pulsar.getConfiguration().getMetricsServletTimeoutMs(); |
| this.splitTopicAndPartitionLabel = splitTopicAndPartitionLabel; |
| } |
| |
| @Override |
| public void init() throws ServletException { |
| executor = Executors.newSingleThreadScheduledExecutor(new DefaultThreadFactory("prometheus-stats")); |
| } |
| |
| @Override |
| protected void doGet(HttpServletRequest request, HttpServletResponse response) |
| throws ServletException, IOException { |
| AsyncContext context = request.startAsync(); |
| context.setTimeout(metricsServletTimeoutMs); |
| executor.execute(safeRun(() -> { |
| HttpServletResponse res = (HttpServletResponse) context.getResponse(); |
| try { |
| res.setStatus(HttpStatus.OK_200); |
| res.setContentType("text/plain"); |
| PrometheusMetricsGenerator.generate(pulsar, shouldExportTopicMetrics, shouldExportConsumerMetrics, |
| shouldExportProducerMetrics, splitTopicAndPartitionLabel, res.getOutputStream(), |
| metricsProviders); |
| context.complete(); |
| |
| } catch (Exception e) { |
| log.error("Failed to generate prometheus stats", e); |
| res.setStatus(HttpStatus.INTERNAL_SERVER_ERROR_500); |
| context.complete(); |
| } |
| })); |
| } |
| |
| @Override |
| public void destroy() { |
| if (executor != null) { |
| executor.shutdownNow(); |
| } |
| } |
| |
| public void addRawMetricsProvider(PrometheusRawMetricsProvider metricsProvider) { |
| if (metricsProviders == null) { |
| metricsProviders = new LinkedList<>(); |
| } |
| metricsProviders.add(metricsProvider); |
| } |
| |
| private static final Logger log = LoggerFactory.getLogger(PrometheusMetricsServlet.class); |
| } |