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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.http.prometheus;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import com.google.errorprone.annotations.RestrictedApi;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.io.Writer;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.Collection;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.regex.Pattern;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import javax.servlet.http.HttpServlet;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import javax.servlet.http.HttpServletRequest;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import javax.servlet.http.HttpServletResponse;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.commons.lang3.StringUtils;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.metrics2.AbstractMetric;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.metrics2.MetricType;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.metrics2.MetricsRecord;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.metrics2.MetricsTag;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hadoop.metrics2.impl.MetricsExportHelper;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span><a name="line.35"></a> |
| <span class="sourceLineNo">036</span>@InterfaceAudience.Private<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>public class PrometheusHadoopServlet extends HttpServlet {<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> private static final Pattern SPLIT_PATTERN =<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> Pattern.compile("(?<=[a-z])(?=[A-Z])|(?<=[A-Z])(?=([A-Z][a-z]))|\\W|(_)+");<a name="line.39"></a> |
| <span class="sourceLineNo">040</span><a name="line.40"></a> |
| <span class="sourceLineNo">041</span> @Override<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> writeMetrics(resp.getWriter(), "true".equals(req.getParameter("description")),<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> req.getParameter("qry"));<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> }<a name="line.45"></a> |
| <span class="sourceLineNo">046</span><a name="line.46"></a> |
| <span class="sourceLineNo">047</span> static String toPrometheusName(String metricRecordName, String metricName) {<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> String baseName = metricRecordName + StringUtils.capitalize(metricName);<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> String[] parts = SPLIT_PATTERN.split(baseName);<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> return String.join("_", parts).toLowerCase();<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> }<a name="line.51"></a> |
| <span class="sourceLineNo">052</span><a name="line.52"></a> |
| <span class="sourceLineNo">053</span> /*<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * SimpleClient for Prometheus is not used, because the format is very easy to implement and this<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> * solution doesn't add any dependencies to the project. You can check the Prometheus format here:<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> * https://prometheus.io/docs/instrumenting/exposition_formats/<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> */<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> @RestrictedApi(explanation = "Should only be called in tests or self", link = "",<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> allowedOnPath = ".*/src/test/.*|.*/PrometheusHadoopServlet\\.java")<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> void writeMetrics(Writer writer, boolean descriptionEnabled, String queryParam)<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> throws IOException {<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> Collection<MetricsRecord> metricRecords = MetricsExportHelper.export();<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> for (MetricsRecord metricsRecord : metricRecords) {<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> for (AbstractMetric metrics : metricsRecord.metrics()) {<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> if (metrics.type() == MetricType.COUNTER || metrics.type() == MetricType.GAUGE) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span><a name="line.66"></a> |
| <span class="sourceLineNo">067</span> String key = toPrometheusName(metricsRecord.name(), metrics.name());<a name="line.67"></a> |
| <span class="sourceLineNo">068</span><a name="line.68"></a> |
| <span class="sourceLineNo">069</span> if (queryParam == null || key.contains(queryParam)) {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span><a name="line.70"></a> |
| <span class="sourceLineNo">071</span> if (descriptionEnabled) {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> String description = metrics.description();<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> if (!description.isEmpty()) writer.append("# HELP ").append(description).append('\n');<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> }<a name="line.74"></a> |
| <span class="sourceLineNo">075</span><a name="line.75"></a> |
| <span class="sourceLineNo">076</span> writer.append("# TYPE ").append(key).append(" ")<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> .append(metrics.type().toString().toLowerCase()).append('\n').append(key).append("{");<a name="line.77"></a> |
| <span class="sourceLineNo">078</span><a name="line.78"></a> |
| <span class="sourceLineNo">079</span> /* add tags */<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> String sep = "";<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> for (MetricsTag tag : metricsRecord.tags()) {<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> String tagName = tag.name().toLowerCase();<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> writer.append(sep).append(tagName).append("=\"").append(tag.value()).append("\"");<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> sep = ",";<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> }<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> writer.append("} ");<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> writer.append(metrics.value().toString()).append('\n');<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> }<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> }<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> }<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> }<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> writer.flush();<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> }<a name="line.93"></a> |
| <span class="sourceLineNo">094</span>}<a name="line.94"></a> |
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