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.bookkeeper.stats.prometheus;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertSame;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufAllocator;
  import java.io.StringWriter;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.concurrent.TimeUnit;
  import lombok.Cleanup;
  import org.apache.bookkeeper.stats.Counter;
  import org.apache.bookkeeper.stats.StatsLogger;
  import org.apache.commons.configuration2.PropertiesConfiguration;
  import org.junit.Assert;
  import org.junit.Test;
  
  /**
   * Unit test of {@link PrometheusMetricsProvider}.
   */
  public class TestPrometheusMetricsProvider {
  
      @Test
      public void testStartNoHttp() {
          PropertiesConfiguration config = new PropertiesConfiguration();
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_ENABLE, false);
          PrometheusMetricsProvider provider = new PrometheusMetricsProvider();
          try {
              provider.start(config);
              assertNull(provider.server);
          } finally {
              provider.stop();
          }
      }
  
      @Test
      public void testStartNoHttpWhenBkHttpEnabled() {
          PropertiesConfiguration config = new PropertiesConfiguration();
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_ENABLE, true);
          config.setProperty("httpServerEnabled", true);
          @Cleanup("stop") PrometheusMetricsProvider provider = new PrometheusMetricsProvider();
          provider.start(config);
          assertNull(provider.server);
      }
  
      @Test
      public void testStartWithHttp() {
          PropertiesConfiguration config = new PropertiesConfiguration();
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_ENABLE, true);
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_PORT, 0); // ephemeral
          PrometheusMetricsProvider provider = new PrometheusMetricsProvider();
          try {
              provider.start(config);
              assertNotNull(provider.server);
          } finally {
              provider.stop();
          }
      }
  
      @Test
      public void testStartWithHttpSpecifyAddr() {
          PropertiesConfiguration config = new PropertiesConfiguration();
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_ENABLE, true);
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_PORT, 0); // ephemeral
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_ADDRESS, "127.0.0.1");
          PrometheusMetricsProvider provider = new PrometheusMetricsProvider();
          try {
              provider.start(config);
              assertNotNull(provider.server);
          } finally {
              provider.stop();
          }
      }
  
      @Test
      public void testCounter() {
          LongAdderCounter counter = new LongAdderCounter(Collections.emptyMap());
          long value = counter.get();
          assertEquals(0L, value);
          counter.inc();
          assertEquals(1L, counter.get().longValue());
          counter.dec();
          assertEquals(0L, counter.get().longValue());
          counter.addCount(3);
          assertEquals(3L, counter.get().longValue());
      }
  
      @Test
      public void testCounter2() {
          LongAdderCounter counter = new LongAdderCounter(Collections.emptyMap());
          long value = counter.get();
          assertEquals(0L, value);
          counter.addLatency(3 * 1000 * 1000L, TimeUnit.NANOSECONDS);
          assertEquals(3L, counter.get().longValue());
      }
  
      @Test
      public void testTwoCounters() throws Exception {
          PrometheusMetricsProvider provider = new PrometheusMetricsProvider();
          StatsLogger statsLogger =  provider.getStatsLogger("test");
  
          Counter counter1 = statsLogger.getCounter("counter");
          Counter counter2 = statsLogger.getCounter("counter");
          assertEquals(counter1, counter2);
          assertSame(counter1, counter2);
  
          assertEquals(1, provider.counters.size());
      }
  
      @Test
      public void testJvmDirectMemoryMetrics() throws Exception {
          PropertiesConfiguration config = new PropertiesConfiguration();
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_ENABLE, true);
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_PORT, 0);
          config.setProperty(PrometheusMetricsProvider.PROMETHEUS_STATS_HTTP_ADDRESS, "127.0.0.1");
          PrometheusMetricsProvider provider = new PrometheusMetricsProvider();
          try {
              provider.start(config);
              assertNotNull(provider.server);
              ByteBuf byteBuf = ByteBufAllocator.DEFAULT.directBuffer(25);
              StringWriter writer = new StringWriter();
              provider.writeAllMetrics(writer);
              String s = writer.toString();
              // prometheus network string uses '\n' in all platform
              String[] split = s.split("\n");
              HashMap<String, String> map = new HashMap<>();
              for (String str : split) {
                  String[] aux = str.split(" ");
                  map.put(aux[0], aux[1]);
              }
              String directBytesMax = map.get("jvm_memory_direct_bytes_max{}");
              Assert.assertNotNull(directBytesMax);
              Assert.assertNotEquals("Nan", directBytesMax);
              Assert.assertNotEquals("-1", directBytesMax);
              String directBytesUsed = map.get("jvm_memory_direct_bytes_used{}");
              Assert.assertNotNull(directBytesUsed);
              Assert.assertNotEquals("Nan", directBytesUsed);
              Assert.assertTrue(Double.parseDouble(directBytesUsed) > 25);
              // ensure byteBuffer doesn't gc
              byteBuf.release();
          } finally {
              provider.stop();
          }
      }
  
  }
  