/*
 * 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.hadoop.metrics2.sink.timeline;

import com.google.gson.Gson;
import org.apache.commons.configuration2.SubsetConfiguration;
import org.apache.commons.configuration2.convert.DefaultListDelimiterHandler;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.metrics2.AbstractMetric;
import org.apache.hadoop.metrics2.MetricType;
import org.apache.hadoop.metrics2.MetricsInfo;
import org.apache.hadoop.metrics2.MetricsRecord;
import org.apache.hadoop.metrics2.MetricsTag;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.easymock.EasyMock;
import org.easymock.IAnswer;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.easymock.PowerMock;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.TreeMap;

import static org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.COLLECTOR_PORT;
import static org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.COLLECTOR_HOSTS_PROPERTY;
import static org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.COLLECTOR_PROTOCOL;
import static org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.INSTANCE_ID_PROPERTY;
import static org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.MAX_METRIC_ROW_CACHE_SIZE;
import static org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.METRICS_SEND_INTERVAL;
import static org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.SET_INSTANCE_ID_PROPERTY;
import static org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.HOST_IN_MEMORY_AGGREGATION_PROTOCOL_PROPERTY;
import static org.easymock.EasyMock.anyInt;
import static org.easymock.EasyMock.anyObject;
import static org.easymock.EasyMock.anyString;
import static org.easymock.EasyMock.createMockBuilder;
import static org.easymock.EasyMock.createNiceMock;
import static org.easymock.EasyMock.eq;
import static org.easymock.EasyMock.expect;
import static org.easymock.EasyMock.expectLastCall;
import static org.easymock.EasyMock.replay;
import static org.easymock.EasyMock.verify;
import static org.powermock.api.easymock.PowerMock.expectNew;
import static org.powermock.api.easymock.PowerMock.replayAll;
import static org.powermock.api.easymock.PowerMock.verifyAll;

@RunWith(PowerMockRunner.class)
@PrepareForTest({AbstractTimelineMetricsSink.class, HttpURLConnection.class, SubsetConfiguration.class})
public class HadoopTimelineMetricsSinkTest {
  Gson gson = new Gson();

  @Before
  public void setup() {
    Logger.getLogger("org.apache.hadoop.metrics2.sink.timeline").setLevel(Level.DEBUG);
  }

  @Test
  @PrepareForTest({URL.class, OutputStream.class, AbstractTimelineMetricsSink.class, HttpURLConnection.class, TimelineMetric.class, HadoopTimelineMetricsSink.class, SubsetConfiguration.class})
  public void testPutMetrics() throws Exception {
    HadoopTimelineMetricsSink sink = new HadoopTimelineMetricsSink();

    HttpURLConnection connection = PowerMock.createNiceMock(HttpURLConnection.class);
    URL url = PowerMock.createNiceMock(URL.class);
    InputStream is = IOUtils.toInputStream(gson.toJson(Collections.singletonList("localhost")));
    TimelineMetric timelineMetric = PowerMock.createNiceMock(TimelineMetric.class);
    expectNew(TimelineMetric.class).andReturn(timelineMetric).times(2);
    expect(timelineMetric.getMetricValues()).andReturn(new TreeMap<Long, Double>()).anyTimes();
    expect(timelineMetric.getMetricName()).andReturn("metricName").anyTimes();
    expectNew(URL.class, anyString()).andReturn(url).anyTimes();
    expect(url.openConnection()).andReturn(connection).anyTimes();
    expect(connection.getInputStream()).andReturn(is).anyTimes();
    expect(connection.getResponseCode()).andReturn(200).anyTimes();
    OutputStream os = PowerMock.createNiceMock(OutputStream.class);
    expect(connection.getOutputStream()).andReturn(os).anyTimes();

    SubsetConfiguration conf = PowerMock.createNiceMock(SubsetConfiguration.class);
    expect(conf.getString("slave.host.name")).andReturn("localhost").anyTimes();
    expect(conf.getParent()).andReturn(null).anyTimes();
    expect(conf.getPrefix()).andReturn("service").anyTimes();
    expect(conf.getStringArray(eq(COLLECTOR_HOSTS_PROPERTY))).andReturn(new String[]{"localhost"," localhost2"}).anyTimes();
    expect(conf.getString(eq("serviceName-prefix"), eq(""))).andReturn("").anyTimes();
    expect(conf.getString(eq(COLLECTOR_PROTOCOL), eq("http"))).andReturn("http").anyTimes();
    expect(conf.getString(eq(COLLECTOR_PORT), eq("6188"))).andReturn("6188").anyTimes();

    expect(conf.getInt(eq(MAX_METRIC_ROW_CACHE_SIZE), anyInt())).andReturn(10).anyTimes();
    expect(conf.getInt(eq(METRICS_SEND_INTERVAL), anyInt())).andReturn(1000).anyTimes();
    expect(conf.getBoolean(eq(SET_INSTANCE_ID_PROPERTY), eq(false))).andReturn(true).anyTimes();
    expect(conf.getString(eq(INSTANCE_ID_PROPERTY), anyString())).andReturn("instanceId").anyTimes();
    expect(conf.getString(eq(HOST_IN_MEMORY_AGGREGATION_PROTOCOL_PROPERTY), anyString())).andReturn("http").anyTimes();

    conf.setListDelimiterHandler(new DefaultListDelimiterHandler(eq(',')));
    expectLastCall().anyTimes();

    expect(conf.getKeys()).andReturn(new Iterator() {
      @Override
      public boolean hasNext() {
        return false;
      }

      @Override
      public Object next() {
        return null;
      }

      @Override
      public void remove() {

      }
    }).once();

    AbstractMetric metric = createNiceMock(AbstractMetric.class);
    expect(metric.name()).andReturn("metricName").anyTimes();
    expect(metric.value()).andReturn(9.5687).anyTimes();
    expect(metric.type()).andReturn(MetricType.COUNTER).anyTimes();
    //TODO currently only numeric metrics are supported

    MetricsRecord record = createNiceMock(MetricsRecord.class);
    expect(record.name()).andReturn("testName").anyTimes();
    expect(record.context()).andReturn("testContext").anyTimes();
    expect(record.timestamp()).andAnswer(new IAnswer<Long>() {
      @Override
      public Long answer() throws Throwable {
        return System.currentTimeMillis();
      }
    }).anyTimes();

    expect(record.metrics()).andReturn(Arrays.asList(metric)).anyTimes();

    timelineMetric.setInstanceId(eq("instanceId"));
    EasyMock.expectLastCall();

    replay(record, metric);
    replayAll();

    sink.init(conf);

    sink.putMetrics(record);

    Thread.sleep(1500L);

    sink.putMetrics(record);

    verifyAll();
  }

  @Test
  public void testDuplicateTimeSeriesNotSaved() throws Exception {
    HadoopTimelineMetricsSink sink =
      createMockBuilder(HadoopTimelineMetricsSink.class)
        .withConstructor().addMockedMethod("appendPrefix")
        .addMockedMethod("findLiveCollectorHostsFromKnownCollector")
        .addMockedMethod("emitMetrics", TimelineMetrics.class).createNiceMock();

    SubsetConfiguration conf = PowerMock.createNiceMock(SubsetConfiguration.class);
    expect(conf.getString("slave.host.name")).andReturn("localhost").anyTimes();
    expect(conf.getParent()).andReturn(null).anyTimes();
    expect(conf.getPrefix()).andReturn("service").anyTimes();
    expect(conf.getStringArray(eq(COLLECTOR_HOSTS_PROPERTY))).andReturn(new String[]{"localhost", "localhost2"}).anyTimes();
    expect(conf.getString(eq("serviceName-prefix"), eq(""))).andReturn("").anyTimes();
    expect(conf.getString(eq(COLLECTOR_PROTOCOL), eq("http"))).andReturn("http").anyTimes();
    expect(conf.getString(eq(COLLECTOR_PORT), eq("6188"))).andReturn("6188").anyTimes();
    expect(conf.getString(eq(HOST_IN_MEMORY_AGGREGATION_PROTOCOL_PROPERTY), anyString())).andReturn("http").anyTimes();

    expect(conf.getInt(eq(MAX_METRIC_ROW_CACHE_SIZE), anyInt())).andReturn(10).anyTimes();
    // Return eviction time smaller than time diff for first 3 entries
    // Third entry will result in eviction
    expect(conf.getInt(eq(METRICS_SEND_INTERVAL), anyInt())).andReturn(10).anyTimes();

    expect(sink.findLiveCollectorHostsFromKnownCollector("localhost", "6188"))
      .andReturn(Collections.singletonList("localhost")).anyTimes();
    expect(sink.findLiveCollectorHostsFromKnownCollector("localhost2", "6188"))
            .andReturn(Collections.singletonList("localhost2")).anyTimes();

    conf.setListDelimiterHandler(new DefaultListDelimiterHandler(eq(',')));
    expectLastCall().anyTimes();

    expect(conf.getKeys()).andReturn(new Iterator() {
      @Override
      public boolean hasNext() {
        return false;
      }

      @Override
      public Object next() {
        return null;
      }

      @Override
      public void remove() {

      }
    }).once();

    AbstractMetric metric = createNiceMock(AbstractMetric.class);
    expect(metric.name()).andReturn("metricName").anyTimes();
    expect(metric.value()).andReturn(1.0).once();
    expect(metric.value()).andReturn(2.0).once();
    expect(metric.value()).andReturn(3.0).once();
    expect(metric.value()).andReturn(4.0).once();
    expect(metric.value()).andReturn(5.0).once();
    expect(metric.value()).andReturn(6.0).once();

    MetricsRecord record = createNiceMock(MetricsRecord.class);
    expect(record.name()).andReturn("testName").anyTimes();
    expect(record.context()).andReturn("testContext").anyTimes();

    sink.appendPrefix(eq(record), (StringBuilder) anyObject());
    expectLastCall().anyTimes().andStubAnswer(new IAnswer<Object>() {
      @Override
      public Object answer() throws Throwable {
        return null;
      }
    });

    final Long now = System.currentTimeMillis();
    // TODO: Current implementation of cache needs > 1 elements to evict any
    expect(record.timestamp()).andReturn(now).times(2);
    expect(record.timestamp()).andReturn(now + 100l).times(2);
    expect(record.timestamp()).andReturn(now + 200l).once();
    expect(record.timestamp()).andReturn(now + 300l).once();

    expect(record.metrics()).andReturn(Arrays.asList(metric)).anyTimes();

    final List<TimelineMetrics> capturedMetrics = new ArrayList<TimelineMetrics>();
    sink.emitMetrics((TimelineMetrics) anyObject());
    expectLastCall().andStubAnswer(new IAnswer<Object>() {
      @Override
      public Object answer() throws Throwable {
        capturedMetrics.add((TimelineMetrics) EasyMock.getCurrentArguments()[0]);
        return null;
      }
    });

    replay(conf, sink, record, metric);

    sink.init(conf);

    // time = t1
    sink.putMetrics(record);
    // time = t1
    sink.putMetrics(record);
    // time = t2
    sink.putMetrics(record);
    // Evict
    // time = t2
    sink.putMetrics(record);
    // time = t3
    sink.putMetrics(record);
    // time = t4
    sink.putMetrics(record);

    verify(conf, sink, record, metric);

    Assert.assertEquals(2, capturedMetrics.size());
    Iterator<TimelineMetrics> metricsIterator = capturedMetrics.iterator();

    // t1, t2
    TimelineMetric timelineMetric1 = metricsIterator.next().getMetrics().get(0);
    Assert.assertEquals(2, timelineMetric1.getMetricValues().size());
    Iterator<Long> timestamps = timelineMetric1.getMetricValues().keySet().iterator();
    Assert.assertEquals(now, timestamps.next());
    Assert.assertEquals(new Long(now + 100l), timestamps.next());
    Iterator<Double> values = timelineMetric1.getMetricValues().values().iterator();
    Assert.assertEquals(new Double(1.0), values.next());
    Assert.assertEquals(new Double(3.0), values.next());
    // t3, t4
    TimelineMetric timelineMetric2 = metricsIterator.next().getMetrics().get(0);
    Assert.assertEquals(2, timelineMetric2.getMetricValues().size());
    timestamps = timelineMetric2.getMetricValues().keySet().iterator();
    Assert.assertEquals(new Long(now + 200l), timestamps.next());
    Assert.assertEquals(new Long(now + 300l), timestamps.next());
    values = timelineMetric2.getMetricValues().values().iterator();
    Assert.assertEquals(new Double(5.0), values.next());
    Assert.assertEquals(new Double(6.0), values.next());
  }

  @Test
  public void testRPCPortSuffixHandledCorrectly() throws Exception {
    HadoopTimelineMetricsSink sink =
      createMockBuilder(HadoopTimelineMetricsSink.class)
        .withConstructor().addMockedMethod("appendPrefix")
        .addMockedMethod("findLiveCollectorHostsFromKnownCollector")
        .addMockedMethod("emitMetrics", TimelineMetrics.class).createNiceMock();

    SubsetConfiguration conf = PowerMock.createNiceMock(SubsetConfiguration.class);
    expect(conf.getString("slave.host.name")).andReturn("localhost").anyTimes();
    expect(conf.getParent()).andReturn(null).anyTimes();
    expect(conf.getPrefix()).andReturn("service").anyTimes();
    expect(conf.getStringArray(eq(COLLECTOR_HOSTS_PROPERTY))).andReturn(new String[]{"localhost", "localhost2"}).anyTimes();
    expect(conf.getString(eq("serviceName-prefix"), eq(""))).andReturn("").anyTimes();
    expect(conf.getString(eq(COLLECTOR_PROTOCOL), eq("http"))).andReturn("http").anyTimes();
    expect(conf.getString(eq(COLLECTOR_PORT), eq("6188"))).andReturn("6188").anyTimes();

    expect(sink.findLiveCollectorHostsFromKnownCollector("localhost", "6188"))
      .andReturn(Collections.singletonList("localhost")).anyTimes();
    expect(sink.findLiveCollectorHostsFromKnownCollector("localhost2", "6188"))
            .andReturn(Collections.singletonList("localhost2")).anyTimes();

    expect(conf.getInt(eq(MAX_METRIC_ROW_CACHE_SIZE), anyInt())).andReturn(10).anyTimes();
    expect(conf.getInt(eq(METRICS_SEND_INTERVAL), anyInt())).andReturn(10).anyTimes();
    expect(conf.getString(eq(HOST_IN_MEMORY_AGGREGATION_PROTOCOL_PROPERTY), anyString())).andReturn("http").anyTimes();

    conf.setListDelimiterHandler(new DefaultListDelimiterHandler(eq(',')));
    expectLastCall().anyTimes();

    Set<String> rpcPortSuffixes = new HashSet<String>() {{
      add("metric.rpc.client.port");
      add("metric.rpc.datanode.port");
      add("metric.rpc.healthcheck.port");
    }};

    expect(conf.getKeys()).andReturn(rpcPortSuffixes.iterator());
    expect(conf.getString("metric.rpc.client.port")).andReturn("8020");
    expect(conf.getString("metric.rpc.datanode.port")).andReturn("8040");
    expect(conf.getString("metric.rpc.healthcheck.port")).andReturn("8060");

    AbstractMetric metric = createNiceMock(AbstractMetric.class);
    expect(metric.name()).andReturn("rpc.metricName").anyTimes();
    expect(metric.value()).andReturn(1.0).once();
    expect(metric.value()).andReturn(2.0).once();
    expect(metric.value()).andReturn(3.0).once();
    expect(metric.value()).andReturn(4.0).once();
    expect(metric.value()).andReturn(5.0).once();
    expect(metric.value()).andReturn(6.0).once();

    MetricsRecord record = createNiceMock(MetricsRecord.class);
    expect(record.name()).andReturn("testMetric").anyTimes();
    expect(record.context()).andReturn("rpc").anyTimes();
    Collection<MetricsTag> tags1 = Collections.singletonList(
      new MetricsTag(new MetricsInfo() {
        @Override
        public String name() {
          return "port";
        }

        @Override
        public String description() {
          return null;
        }
      }, "8020")
    );
    Collection<MetricsTag> tags2 = Collections.singletonList(
      new MetricsTag(new MetricsInfo() {
        @Override
        public String name() {
          return "port";
        }

        @Override
        public String description() {
          return null;
        }
      }, "8040")
    );
    expect(record.tags()).andReturn(tags1).times(12);
    expect(record.tags()).andReturn(tags2).times(12);

    sink.appendPrefix(eq(record), (StringBuilder) anyObject());
    expectLastCall().anyTimes().andStubAnswer(new IAnswer<Object>() {
      @Override
      public Object answer() throws Throwable {
        return null;
      }
    });

    final Long now = System.currentTimeMillis();
    // TODO: Current implementation of cache needs > 1 elements to evict any
    expect(record.timestamp()).andReturn(now).times(2);
    expect(record.timestamp()).andReturn(now + 100l).times(2);
    expect(record.timestamp()).andReturn(now + 200l).once();
    expect(record.timestamp()).andReturn(now + 300l).once();

    expect(record.metrics()).andReturn(Arrays.asList(metric)).anyTimes();

    final List<TimelineMetrics> capturedMetrics = new ArrayList<TimelineMetrics>();
    sink.emitMetrics((TimelineMetrics) anyObject());
    expectLastCall().andStubAnswer(new IAnswer<Object>() {
      @Override
      public Object answer() throws Throwable {
        capturedMetrics.add((TimelineMetrics) EasyMock.getCurrentArguments()[0]);
        return null;
      }
    });

    replay(conf, sink, record, metric);

    sink.init(conf);

    // time = t1
    sink.putMetrics(record);
    // time = t1
    sink.putMetrics(record);
    // time = t2
    sink.putMetrics(record);
    // Evict
    // time = t2
    sink.putMetrics(record);
    // time = t3
    sink.putMetrics(record);
    // time = t4
    sink.putMetrics(record);

    verify(conf, sink, record, metric);

    Assert.assertEquals(2, capturedMetrics.size());
    Iterator<TimelineMetrics> metricsIterator = capturedMetrics.iterator();

    // t1, t2
    TimelineMetric timelineMetric1 = metricsIterator.next().getMetrics().get(0);
    Assert.assertEquals(2, timelineMetric1.getMetricValues().size());
    // Assert the tag added to the name
    Assert.assertEquals("rpc.testMetric.client.rpc.metricName", timelineMetric1.getMetricName());
    // t3, t4
    TimelineMetric timelineMetric2 = metricsIterator.next().getMetrics().get(0);
    Assert.assertEquals(2, timelineMetric2.getMetricValues().size());
    // Assert the tag added to the name
    Assert.assertEquals("rpc.testMetric.datanode.rpc.metricName", timelineMetric2.getMetricName());
  }
}