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.cassandra.locator;
  
  import java.net.InetAddress;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.junit.Test;
  
  import org.apache.cassandra.config.Config;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.config.ParameterizedClass;
  import org.apache.cassandra.utils.FBUtilities;
  import org.mockito.MockedStatic;
  
  import static java.lang.String.format;
  import static java.util.Arrays.asList;
  import static java.util.Collections.singletonList;
  import static org.apache.cassandra.locator.SimpleSeedProvider.RESOLVE_MULTIPLE_IP_ADDRESSES_PER_DNS_RECORD_KEY;
  import static org.apache.cassandra.locator.SimpleSeedProvider.SEEDS_KEY;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  import static org.mockito.Mockito.mockStatic;
  
  public class SimpleSeedProviderTest
  {
      private static final String dnsName1 = "dns-name-1";
      private static final String dnsName2 = "dns-name-2";
  
      @Test
      public void testSeedsResolution() throws Throwable
      {
          MockedStatic<InetAddressAndPort> inetAddressAndPortMock = null;
          MockedStatic<DatabaseDescriptor> descriptorMock = null;
          MockedStatic<FBUtilities> fbUtilitiesMock = null;
  
          try
          {
              byte[] addressBytes1 = new byte[]{ 127, 0, 0, 1 };
              byte[] addressBytes2 = new byte[]{ 127, 0, 0, 2 };
              byte[] addressBytes3 = new byte[]{ 127, 0, 0, 3 };
              InetAddressAndPort address1 = new InetAddressAndPort(InetAddress.getByAddress(addressBytes1), addressBytes1, 7000);
              InetAddressAndPort address2 = new InetAddressAndPort(InetAddress.getByAddress(addressBytes2), addressBytes2, 7000);
              InetAddressAndPort address3 = new InetAddressAndPort(InetAddress.getByAddress(addressBytes3), addressBytes3, 7000);
  
              inetAddressAndPortMock = mockStatic(InetAddressAndPort.class);
              inetAddressAndPortMock.when(() -> InetAddressAndPort.getByName(dnsName1)).thenReturn(address1);
              inetAddressAndPortMock.when(() -> InetAddressAndPort.getAllByName(dnsName1)).thenReturn(singletonList(address1));
              inetAddressAndPortMock.when(() -> InetAddressAndPort.getAllByName(dnsName2)).thenReturn(asList(address2, address3));
              inetAddressAndPortMock.when(() -> InetAddressAndPort.getByName(dnsName2)).thenReturn(address2);
  
              fbUtilitiesMock = mockStatic(FBUtilities.class);
              fbUtilitiesMock.when(FBUtilities::getLocalAddressAndPort).thenReturn(address1);
  
              descriptorMock = mockStatic(DatabaseDescriptor.class);
  
              Map<String, String> seedProviderArgs = new HashMap<>();
  
              //
              // dns 1 without multiple ips per record
              //
              seedProviderArgs.put(SEEDS_KEY, dnsName1);
              // resolve_multiple_ip_addresses_per_dns_record is implicitly false here
  
              descriptorMock.when(DatabaseDescriptor::loadConfig).thenReturn(getConfig(seedProviderArgs));
              SimpleSeedProvider provider = new SimpleSeedProvider(null);
              List<InetAddressAndPort> seeds = provider.getSeeds();
  
              assertEquals(1, seeds.size());
              assertEquals(address1, seeds.get(0));
  
              //
              // dns 2 without multiple ips per record
              //
              seedProviderArgs.put(SEEDS_KEY, dnsName2);
              // resolve_multiple_ip_addresses_per_dns_record is implicitly false here
  
              descriptorMock.when(DatabaseDescriptor::loadConfig).thenReturn(getConfig(seedProviderArgs));
              provider = new SimpleSeedProvider(null);
              seeds = provider.getSeeds();
  
              assertEquals(1, seeds.size());
              assertTrue(seeds.contains(address2));
  
              //
              // dns 1 with multiple ips per record
              //
              seedProviderArgs.put(SEEDS_KEY, dnsName1);
              seedProviderArgs.put(RESOLVE_MULTIPLE_IP_ADDRESSES_PER_DNS_RECORD_KEY, "true");
  
              descriptorMock.when(DatabaseDescriptor::loadConfig).thenReturn(getConfig(seedProviderArgs));
              provider = new SimpleSeedProvider(null);
              seeds = provider.getSeeds();
  
              assertEquals(1, seeds.size());
              assertEquals(address1, seeds.get(0));
  
              //
              // dns 2 with multiple ips per record
              //
              seedProviderArgs.put(SEEDS_KEY, dnsName2);
              seedProviderArgs.put(RESOLVE_MULTIPLE_IP_ADDRESSES_PER_DNS_RECORD_KEY, "true");
  
              descriptorMock.when(DatabaseDescriptor::loadConfig).thenReturn(getConfig(seedProviderArgs));
              provider = new SimpleSeedProvider(null);
              seeds = provider.getSeeds();
  
              assertEquals(2, seeds.size());
              assertTrue(seeds.containsAll(asList(address2, address3)));
  
              //
              // dns 1 and dns 2 without multiple ips per record
              //
              seedProviderArgs.put(SEEDS_KEY, format("%s,%s", dnsName1, dnsName2));
              seedProviderArgs.put(RESOLVE_MULTIPLE_IP_ADDRESSES_PER_DNS_RECORD_KEY, "false");
  
              descriptorMock.when(DatabaseDescriptor::loadConfig).thenReturn(getConfig(seedProviderArgs));
              provider = new SimpleSeedProvider(null);
              seeds = provider.getSeeds();
  
              assertEquals(2, seeds.size());
              assertTrue(seeds.containsAll(asList(address1, address2)));
  
              //
              // dns 1 and dns 2 with multiple ips per record
              //
              seedProviderArgs.put(SEEDS_KEY, format("%s,%s", dnsName1, dnsName2));
              seedProviderArgs.put(RESOLVE_MULTIPLE_IP_ADDRESSES_PER_DNS_RECORD_KEY, "true");
  
              descriptorMock.when(DatabaseDescriptor::loadConfig).thenReturn(getConfig(seedProviderArgs));
              provider = new SimpleSeedProvider(null);
              seeds = provider.getSeeds();
  
              assertEquals(3, seeds.size());
              assertTrue(seeds.containsAll(asList(address1, address2, address3)));
          }
          finally
          {
              if (inetAddressAndPortMock != null)
                  inetAddressAndPortMock.close();
  
              if (descriptorMock != null)
                  descriptorMock.close();
  
              if (fbUtilitiesMock != null)
                  fbUtilitiesMock.close();
          }
      }
  
      private static Config getConfig(Map<String, String> parameters)
      {
          Config config = new Config();
          config.seed_provider = new ParameterizedClass();
          config.seed_provider.class_name = SimpleSeedProvider.class.getName();
          config.seed_provider.parameters = parameters;
          return config;
      }
  }
  