content: /*
   * 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.beam.runners.extensions.metrics;
  
  import static org.junit.Assert.assertEquals;
  
  import com.sun.net.httpserver.HttpServer;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.net.HttpURLConnection;
  import java.net.InetSocketAddress;
  import java.net.ServerSocket;
  import java.nio.charset.StandardCharsets;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  import org.apache.beam.sdk.metrics.MetricQueryResults;
  import org.apache.beam.sdk.metrics.MetricsOptions;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.junit.AfterClass;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  /** Test class for MetricsHttpSink. */
  public class MetricsHttpSinkTest {
    private static int port;
    private static List<String> messages = new ArrayList<>();
    private static HttpServer httpServer;
    private static CountDownLatch countDownLatch;
  
    @BeforeClass
    public static void beforeClass() throws IOException {
      // get free local port
      ServerSocket serverSocket = new ServerSocket(0);
      port = serverSocket.getLocalPort();
      serverSocket.close();
      httpServer = HttpServer.create(new InetSocketAddress(port), 0);
      httpServer
          .createContext("/")
          .setHandler(
              httpExchange -> {
                try (final BufferedReader in =
                    new BufferedReader(
                        new InputStreamReader(
                            httpExchange.getRequestBody(), StandardCharsets.UTF_8))) {
                  String line;
                  while ((line = in.readLine()) != null) {
                    messages.add(line);
                  }
                }
                httpExchange.sendResponseHeaders(HttpURLConnection.HTTP_OK, 0L);
                httpExchange.close();
                countDownLatch.countDown();
              });
      httpServer.start();
    }
  
    @Before
    public void before() {
      messages.clear();
    }
  
    @Test
    public void testWriteMetricsWithCommittedSupported() throws Exception {
      MetricQueryResults metricQueryResults = new CustomMetricQueryResults(true);
      MetricsOptions pipelineOptions = PipelineOptionsFactory.create().as(MetricsOptions.class);
      pipelineOptions.setMetricsHttpSinkUrl(String.format("http://localhost:%s", port));
      MetricsHttpSink metricsHttpSink = new MetricsHttpSink(pipelineOptions);
      countDownLatch = new CountDownLatch(1);
      metricsHttpSink.writeMetrics(metricQueryResults);
      countDownLatch.await();
      String expected =
          "{\"boundedTries\":[{\"attempted\":{\"result\":[[\"cd\",\"false\"]]},"
              + "\"committed\":{\"result\":[[\"ab\",\"false\"]]},\"name\":{\"name\":\"n3\","
              + "\"namespace\":\"ns1\"},\"step\":\"s3\"}],"
              + "\"counters\":[{\"attempted\":20,\"committed\":10,\"name\":{\"name\":\"n1\","
              + "\"namespace\":\"ns1\"},\"step\":\"s1\"}],\"distributions\":[{\"attempted\":"
              + "{\"count\":4,\"max\":9,\"mean\":6.25,\"min\":3,\"sum\":25},\"committed\":"
              + "{\"count\":2,\"max\":8,\"mean\":5.0,\"min\":5,\"sum\":10},\"name\":{\"name\":\"n2\","
              + "\"namespace\":\"ns1\"},\"step\":\"s2\"}],\"gauges\":[{\"attempted\":{\"timestamp\":"
              + "\"1970-01-05T00:04:22.800Z\",\"value\":120},\"committed\":{\"timestamp\":"
              + "\"1970-01-05T00:04:22.800Z\",\"value\":100},\"name\":{\"name\":\"n3\",\"namespace\":"
              + "\"ns1\"},\"step\":\"s3\"}],\"histograms\":[],\"stringSets\":[{\"attempted\":{\"stringSet\":[\"cd"
              + "\"]},\"committed\":{\"stringSet\":[\"ab\"]},\"name\":{\"name\":\"n3\","
              + "\"namespace\":\"ns1\"},\"step\":\"s3\"}]}";
      assertEquals("Wrong number of messages sent to HTTP server", 1, messages.size());
      assertEquals("Wrong messages sent to HTTP server", expected, messages.get(0));
    }
  
    @Test
    public void testWriteMetricsWithCommittedUnSupported() throws Exception {
      MetricQueryResults metricQueryResults = new CustomMetricQueryResults(false);
      MetricsOptions pipelineOptions = PipelineOptionsFactory.create().as(MetricsOptions.class);
      pipelineOptions.setMetricsHttpSinkUrl(String.format("http://localhost:%s", port));
      MetricsHttpSink metricsHttpSink = new MetricsHttpSink(pipelineOptions);
      countDownLatch = new CountDownLatch(1);
      metricsHttpSink.writeMetrics(metricQueryResults);
      countDownLatch.await();
      String expected =
          "{\"boundedTries\":[{\"attempted\":{\"result\":[[\"cd\",\"false\"]]},"
              + "\"name\":{\"name\":\"n3\",\"namespace\":\"ns1\"},\"step\":\"s3\"}],"
              + "\"counters\":[{\"attempted\":20,\"name\":{\"name\":\"n1\","
              + "\"namespace\":\"ns1\"},\"step\":\"s1\"}],\"distributions\":[{\"attempted\":"
              + "{\"count\":4,\"max\":9,\"mean\":6.25,\"min\":3,\"sum\":25},\"name\":{\"name\":\"n2\""
              + ",\"namespace\":\"ns1\"},\"step\":\"s2\"}],\"gauges\":[{\"attempted\":{\"timestamp\":"
              + "\"1970-01-05T00:04:22.800Z\",\"value\":120},\"name\":{\"name\":\"n3\",\"namespace\":"
              + "\"ns1\"},\"step\":\"s3\"}],\"histograms\":[],\"stringSets\":[{\"attempted\":{\"stringSet\":[\"cd\"]},"
              + "\"name\":{\"name\":\"n3\",\"namespace\":\"ns1\"},\"step\":\"s3\"}]}";
      assertEquals("Wrong number of messages sent to HTTP server", 1, messages.size());
      assertEquals("Wrong messages sent to HTTP server", expected, messages.get(0));
    }
  
    @AfterClass
    public static void after() {
      httpServer.stop(0);
    }
  }
  