| /* |
| * 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.karaf.decanter.collector.prometheus; |
| |
| import org.apache.karaf.decanter.collector.utils.PropertiesPreparator; |
| import org.osgi.service.component.ComponentContext; |
| import org.osgi.service.component.annotations.Activate; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.event.Event; |
| import org.osgi.service.event.EventAdmin; |
| import org.osgi.service.event.EventConstants; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.BufferedReader; |
| import java.io.InputStreamReader; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.util.Dictionary; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| @Component( |
| name = "org.apache.karaf.decanter.collector.prometheus", |
| immediate = true, |
| property = { "decanter.collector.name=prometheus", |
| "scheduler.period:Long=60", |
| "scheduler.concurrent:Boolean=false", |
| "scheduler.name=decanter-collector-prometheus"} |
| ) |
| public class PrometheusCollector implements Runnable { |
| |
| private final static Logger LOGGER = LoggerFactory.getLogger(PrometheusCollector.class); |
| |
| @Reference |
| public EventAdmin dispatcher; |
| |
| private Dictionary<String, Object> properties; |
| |
| private URL prometheusURL; |
| |
| @Activate |
| public void activate(ComponentContext componentContext) throws Exception { |
| activate(componentContext.getProperties()); |
| } |
| |
| public void activate(Dictionary<String, Object> properties) throws Exception { |
| this.properties = properties; |
| if (properties.get("prometheus.url") == null) { |
| throw new IllegalArgumentException("prometheus.url is mandatory in the configuration"); |
| } |
| prometheusURL = new URL(properties.get("prometheus.url").toString()); |
| } |
| |
| @Override |
| public void run() { |
| try { |
| URLConnection connection = prometheusURL.openConnection(); |
| Map<String, Object> data = new HashMap<>(); |
| data.put("type", "prometheus"); |
| try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))) { |
| String line; |
| while ((line = reader.readLine()) != null) { |
| if (line.matches("# TYPE .* gauge")) { |
| line = reader.readLine(); |
| if (line == null) { |
| break; |
| } |
| String[] split = line.split(" "); |
| if (split.length == 2) { |
| String property = split[0]; |
| double value = Double.parseDouble(split[1]); |
| data.put(property, value); |
| } |
| } |
| } |
| } |
| PropertiesPreparator.prepare(data, properties); |
| String topic = (properties.get(EventConstants.EVENT_TOPIC) != null) ? (String) properties.get(EventConstants.EVENT_TOPIC) : "decanter/collect/prometheus"; |
| dispatcher.postEvent(new Event(topic, data)); |
| } catch (Exception e) { |
| LOGGER.warn("Can't get Prometheus metrics", e); |
| e.printStackTrace(); |
| } |
| } |
| |
| public void setDispatcher(EventAdmin dispatcher) { |
| this.dispatcher = dispatcher; |
| } |
| |
| } |