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Exposing prometheus metrics for Pulsar function local run mode (apach…
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pulsar-broker/src/test/java/org/apache/pulsar/functions/worker/PulsarFunctionTestUtils.java
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| /** | ||
| * 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.functions.worker; | ||
|
|
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| import lombok.ToString; | ||
| import lombok.extern.slf4j.Slf4j; | ||
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|
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| import java.io.BufferedReader; | ||
| import java.io.IOException; | ||
| import java.io.InputStreamReader; | ||
| import java.net.HttpURLConnection; | ||
| import java.net.URL; | ||
| import java.util.Arrays; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.TreeMap; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
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|
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| import static com.google.common.base.Preconditions.checkArgument; | ||
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|
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| @Slf4j | ||
| public class PulsarFunctionTestUtils { | ||
| public static String getPrometheusMetrics(int metricsPort) throws IOException { | ||
| StringBuilder result = new StringBuilder(); | ||
| URL url = new URL(String.format("http://%s:%s/metrics", "localhost", metricsPort)); | ||
| HttpURLConnection conn = (HttpURLConnection) url.openConnection(); | ||
| conn.setRequestMethod("GET"); | ||
| BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream())); | ||
| String line; | ||
| while ((line = rd.readLine()) != null) { | ||
| result.append(line + System.lineSeparator()); | ||
| } | ||
| rd.close(); | ||
| return result.toString(); | ||
| } | ||
|
|
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| /** | ||
| * Hacky parsing of Prometheus text format. Sould be good enough for unit tests | ||
| */ | ||
| public static Map<String, Metric> parseMetrics(String metrics) { | ||
| final Map<String, Metric> parsed = new HashMap<>(); | ||
| // Example of lines are | ||
| // jvm_threads_current{cluster="standalone",} 203.0 | ||
| // or | ||
| // pulsar_subscriptions_count{cluster="standalone", namespace="sample/standalone/ns1", | ||
| // topic="persistent://sample/standalone/ns1/test-2"} 0.0 1517945780897 | ||
| Pattern pattern = Pattern.compile("^(\\w+)(\\{[^\\}]+\\})?\\s(-?[\\d\\w\\.-]+)(\\s(\\d+))?$"); | ||
| Pattern tagsPattern = Pattern.compile("(\\w+)=\"([^\"]+)\"(,\\s?)?"); | ||
| Arrays.asList(metrics.split("\n")).forEach(line -> { | ||
| if (line.isEmpty() || line.startsWith("#")) { | ||
| return; | ||
| } | ||
| Matcher matcher = pattern.matcher(line); | ||
| log.info("line: {}", line); | ||
| checkArgument(matcher.matches()); | ||
| String name = matcher.group(1); | ||
| Metric m = new Metric(); | ||
| String numericValue = matcher.group(3); | ||
| if (numericValue.equalsIgnoreCase("-Inf")) { | ||
| m.value = Double.NEGATIVE_INFINITY; | ||
| } else if (numericValue.equalsIgnoreCase("+Inf")) { | ||
| m.value = Double.POSITIVE_INFINITY; | ||
| } else { | ||
| m.value = Double.parseDouble(numericValue); | ||
| } | ||
| String tags = matcher.group(2); | ||
| if (tags != null) { | ||
| tags = tags.replace("{", "").replace("}", ""); | ||
| Matcher tagsMatcher = tagsPattern.matcher(tags); | ||
| while (tagsMatcher.find()) { | ||
| String tag = tagsMatcher.group(1); | ||
| String value = tagsMatcher.group(2); | ||
| m.tags.put(tag, value); | ||
| } | ||
| } | ||
| parsed.put(name, m); | ||
| }); | ||
|
|
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| log.info("parsed metrics: {}", parsed); | ||
| return parsed; | ||
| } | ||
|
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| @ToString | ||
| public static class Metric { | ||
| public final Map<String, String> tags = new TreeMap<>(); | ||
| public double value; | ||
| } | ||
| } |
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