/* This file is part of VoltDB.
* Copyright (C) 2008-2017 VoltDB Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
package org.voltcore.network;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.channels.Channel;
import java.nio.channels.SelectionKey;
import com.google_voltpatches.common.base.Function;
import junit.framework.TestCase;
import org.junit.BeforeClass;
import org.junit.Test;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.*;
public class TestReverseDNSCache extends TestCase {
static Function<InetAddress, String> DNS_RESOLVER;
private Field resolverField;
public static InetAddress getAddress(final Integer address) throws Exception {
ByteBuffer addressBytes = ByteBuffer.allocate(4);
addressBytes.putInt(address);
return InetAddress.getByAddress(addressBytes.array());
}
/*
* An experiment with madness
*/
@BeforeClass
public void setUp() throws Exception {
resolverField = ReverseDNSCache.class.getDeclaredField("DNS_RESOLVER");
resolverField.setAccessible(true);
Field modifiersField = Field.class.getDeclaredField("modifiers");
modifiersField.setAccessible(true);
modifiersField.setInt(resolverField, resolverField.getModifiers() & ~Modifier.FINAL);
DNS_RESOLVER = (Function<InetAddress, String>)resolverField.get(null);
}
private void toggleDNSResolver(final String retval) throws Exception {
if (retval == null) {
resolverField.set(null, DNS_RESOLVER);
} else {
resolverField.set(null, new Function<InetAddress, String>() {
@Override
public String apply(java.net.InetAddress inetAddress) {
return retval;
}
});
}
}
@Test
public void testCaching() throws Exception {
final InetAddress addr = getAddress(42);
toggleDNSResolver("foozle");
ReverseDNSCache.hostnameOrAddress(addr);
toggleDNSResolver(addr.getHostAddress());
assertEquals("foozle", ReverseDNSCache.hostnameOrAddress(addr));
}
@Test
public void testFailedStaysFailed() throws Exception {
final InetAddress addr = getAddress(43);
toggleDNSResolver(addr.getHostAddress());
ReverseDNSCache.hostnameOrAddress(addr);
toggleDNSResolver("foozle");
assertFalse("foozle".equals(ReverseDNSCache.hostnameOrAddress(addr)));
}
}