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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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,
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.runners.dataflow.worker.windmill.client.grpc;
  
  import static org.junit.Assert.*;
  
  import java.io.*;
  import java.util.Optional;
  import org.apache.beam.runners.dataflow.options.DataflowWorkerHarnessOptions;
  import org.apache.beam.runners.dataflow.worker.FakeWindmillServer;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.ManagedChannel;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.inprocess.InProcessChannelBuilder;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableSet;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.net.HostAndPort;
  import org.junit.Test;
  import org.junit.rules.ErrorCollector;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  @RunWith(JUnit4.class)
  public class ChannelzServletTest {
  
    @Test
    public void testRendersAllChannels() throws UnsupportedEncodingException {
      String windmill1 = "WindmillHost1";
      String windmill2 = "WindmillHost2";
      String nonWindmill1 = "NonWindmillHost1";
      String someOtherHost1 = "SomeOtherHost2";
      ManagedChannel[] unusedChannels =
          new ManagedChannel[] {
            InProcessChannelBuilder.forName(windmill1).build(),
            InProcessChannelBuilder.forName(windmill2).build(),
            InProcessChannelBuilder.forName(nonWindmill1).build(),
            InProcessChannelBuilder.forName(someOtherHost1).build()
          };
      DataflowWorkerHarnessOptions options =
          PipelineOptionsFactory.create().as(DataflowWorkerHarnessOptions.class);
      FakeWindmillServer fakeWindmillServer =
          new FakeWindmillServer(new ErrorCollector(), s -> Optional.empty());
      fakeWindmillServer.setWindmillServiceEndpoints(
          ImmutableSet.of(HostAndPort.fromHost(windmill1), HostAndPort.fromHost(windmill2)));
      options.setChannelzShowOnlyWindmillServiceChannels(false);
      ChannelzServlet channelzServlet =
          new ChannelzServlet("/channelz", options, fakeWindmillServer::getWindmillServiceEndpoints);
      StringWriter stringWriter = new StringWriter();
      PrintWriter writer = new PrintWriter(stringWriter);
      channelzServlet.captureData(writer);
      writer.flush();
      String channelzData = stringWriter.toString();
      assertTrue(channelzData.contains(windmill1));
      assertTrue(channelzData.contains(windmill2));
      assertTrue(channelzData.contains(nonWindmill1));
      assertTrue(channelzData.contains(someOtherHost1));
    }
  
    @Test
    public void testRendersOnlyWindmillChannels() throws UnsupportedEncodingException {
      String windmill1 = "WindmillHost1";
      String windmill2 = "WindmillHost2";
      String nonWindmill1 = "NonWindmillHost1";
      String someOtherHost1 = "SomeOtherHost2";
      ManagedChannel[] unusedChannels =
          new ManagedChannel[] {
            InProcessChannelBuilder.forName(windmill1).build(),
            InProcessChannelBuilder.forName(windmill2).build(),
            InProcessChannelBuilder.forName(nonWindmill1).build(),
            InProcessChannelBuilder.forName(someOtherHost1).build()
          };
      DataflowWorkerHarnessOptions options =
          PipelineOptionsFactory.create().as(DataflowWorkerHarnessOptions.class);
      FakeWindmillServer fakeWindmillServer =
          new FakeWindmillServer(new ErrorCollector(), s -> Optional.empty());
      fakeWindmillServer.setWindmillServiceEndpoints(
          ImmutableSet.of(HostAndPort.fromHost(windmill1), HostAndPort.fromHost(windmill2)));
      options.setChannelzShowOnlyWindmillServiceChannels(true);
      ChannelzServlet channelzServlet =
          new ChannelzServlet("/channelz", options, fakeWindmillServer::getWindmillServiceEndpoints);
      StringWriter stringWriter = new StringWriter();
      PrintWriter writer = new PrintWriter(stringWriter);
      channelzServlet.captureData(writer);
      writer.flush();
      String channelzData = stringWriter.toString();
      assertTrue(channelzData.contains(windmill1));
      assertTrue(channelzData.contains(windmill2));
      // The logic does a substring match on the target
      // NonWindmillHost1 matches since it contains WindmillHost1 which is a windmill host
      assertTrue(channelzData.contains(nonWindmill1));
      assertFalse(channelzData.contains(someOtherHost1));
    }
  }
  