[GitHub] [nifi] SatwikBhandiwad commented on a change in pull request #3257: NIFI-5435 Prometheus /metrics http endpoint for monitoring integration

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SatwikBhandiwad commented on a change in pull request #3257: NIFI-5435 Prometheus /metrics http endpoint for monitoring integration
URL: https://github.com/apache/nifi/pull/3257#discussion_r266724363
 
 

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 File path: nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/main/java/org/apache/nifi/reporting/prometheus/PrometheusServer.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.nifi.reporting.prometheus;
+
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.net.HttpURLConnection;
+import java.net.InetSocketAddress;
+
+import javax.servlet.ServletException;
+import javax.servlet.ServletOutputStream;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.nifi.controller.status.ProcessGroupStatus;
+import org.apache.nifi.logging.ComponentLog;
+import org.apache.nifi.reporting.ReportingContext;
+import org.apache.nifi.reporting.prometheus.api.PrometheusMetricsUtil;
+import org.apache.nifi.ssl.SSLContextService;
+import org.eclipse.jetty.server.Connector;
+import org.eclipse.jetty.server.HttpConfiguration;
+import org.eclipse.jetty.server.HttpConnectionFactory;
+import org.eclipse.jetty.server.SecureRequestCustomizer;
+import org.eclipse.jetty.server.Server;
+import org.eclipse.jetty.server.ServerConnector;
+import org.eclipse.jetty.server.SslConnectionFactory;
+import org.eclipse.jetty.servlet.ServletContextHandler;
+import org.eclipse.jetty.servlet.ServletHolder;
+import org.eclipse.jetty.util.ssl.SslContextFactory;
+
+import com.yammer.metrics.core.VirtualMachineMetrics;
+
+import io.prometheus.client.CollectorRegistry;
+import io.prometheus.client.exporter.common.TextFormat;
+
+public class PrometheusServer {
+    private static ComponentLog logger;
+    private Server server;
+    private ServletContextHandler handler;
+    private ReportingContext context;
+    private boolean sendJvmMetrics;
+    private String applicationId;
+
+    class MetricsServlet extends HttpServlet {
+        private CollectorRegistry nifiRegistry, jvmRegistry;
+        private ProcessGroupStatus rootGroupStatus;
+
+        @Override
+        protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
+            logger.info("PrometheusServer Do get called");
+
+            rootGroupStatus = PrometheusServer.this.context.getEventAccess().getControllerStatus();
+            ServletOutputStream response = resp.getOutputStream();
+            OutputStreamWriter osw = new OutputStreamWriter(response);
+            nifiRegistry = PrometheusMetricsUtil.createNifiMetrics(rootGroupStatus, PrometheusServer.this.applicationId);
+            TextFormat.write004(osw, nifiRegistry.metricFamilySamples());
+
+            if (PrometheusServer.this.sendJvmMetrics == true) {
+                jvmRegistry = PrometheusMetricsUtil.createJvmMetrics(VirtualMachineMetrics.getInstance());
+                TextFormat.write004(osw, jvmRegistry.metricFamilySamples());
+            }
+
+            osw.flush();
+            osw.close();
+            response.flush();
+            response.close();
+            resp.setHeader("Content-Type", TextFormat.CONTENT_TYPE_004);
+            resp.setStatus(HttpURLConnection.HTTP_OK);
+            resp.flushBuffer();
+        }
+    }
+
+    public PrometheusServer(InetSocketAddress addr, ComponentLog logger) throws Exception {
+        PrometheusServer.logger = logger;
+        this.server = new Server(addr);
+
+        this.handler = new ServletContextHandler(server, "/metrics");
+        this.handler.addServlet(new ServletHolder(new MetricsServlet()), "/");
+        this.server.start();
+    }
+
+    public PrometheusServer(int addr, SSLContextService sslContextService, ComponentLog logger) throws Exception {
+        PrometheusServer.logger = logger;
+        this.server = new Server();
+        this.handler = new ServletContextHandler(server, "/metrics");
+        this.handler.addServlet(new ServletHolder(new MetricsServlet()), "/");
+
+        SslContextFactory sslFactory = createSslFactory(sslContextService);
+        HttpConfiguration httpsConfiguration = new HttpConfiguration();
+        httpsConfiguration.setSecureScheme("https");
+        httpsConfiguration.setSecurePort(addr);
+        httpsConfiguration.addCustomizer(new SecureRequestCustomizer());
+
+        ServerConnector https = new ServerConnector(server, new SslConnectionFactory(sslFactory, "http/1.1"),
+            new HttpConnectionFactory(httpsConfiguration));
+        https.setPort(addr);
+        this.server.setConnectors(new Connector[]{https});
+        this.server.start();
+    }
+
+    private SslContextFactory createSslFactory(final SSLContextService sslService) {
+        SslContextFactory sslFactory = new SslContextFactory();
+        sslFactory.setNeedClientAuth(true);
+        sslFactory.setWantClientAuth(false);
 
 Review comment:
   Hi @kevdoran Thanks for reviewing. I'll refer HandleHttpRequest code for clientAuth part and submit the changes asap.

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