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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,
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.distributed.test;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.concurrent.TimeoutException;
  
  import com.google.common.collect.ImmutableMap;
  import org.junit.Assert;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.Feature;
  import org.apache.cassandra.transport.SimpleClient;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  public class InternodeErrorExclusionTest extends TestBaseImpl
  {
      @BeforeClass
      public static void beforeClass2()
      {
          DatabaseDescriptor.clientInitialization();
      }
  
      // Connect a simple native client to the internode port (which fails on the protocol magic check)
      // and make sure the exception is swallowed.
      @Test
      public void ignoreExcludedInternodeErrors() throws IOException, TimeoutException
      {
          try (Cluster cluster = Cluster.build(1)
                                        .withConfig(c -> c
                                                         .with(Feature.NETWORK)
                                                         .set("internode_error_reporting_exclusions", ImmutableMap.of("subnets", Arrays.asList("127.0.0.1"))))
                                        .start())
          {
  
              causeException();
              assertThat(cluster.get(1).logs().watchFor("address contained in internode_error_reporting_exclusions").getResult()).hasSize(1);
          }
      }
  
      @Test
      public void testNoSpammingInvalidLegacyProtocolMagicException() throws Throwable
      {
          try (Cluster cluster = Cluster.build(1)
                                        .withConfig(c -> c
                                                         .with(Feature.NETWORK)
                                                         .set("invalid_legacy_protocol_magic_no_spam_enabled", true))
                                        .start())
          {
              causeException();
              causeException();
              // we used no spam logger so the second message will not be emitted (the size is still 1).
              assertThat(cluster.get(1).logs().watchFor("Failed to properly handshake with peer localhost. Closing the channel. Invalid legacy protocol magic.").getResult()).hasSize(1);
          }
      }
  
      private void causeException()
      {
          try (SimpleClient client = SimpleClient.builder("127.0.0.1", 7012).build())
          {
              client.connect(true);
              Assert.fail("Connection should fail");
          }
          catch (Exception e)
          {
              // expected
          }
      }
  }
  