/*
* 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.accumulo.core.util;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.security.Security;
import org.apache.hadoop.io.Text;
import org.apache.thrift.transport.TSocket;
import org.apache.log4j.Logger;
public class AddressUtil {
private static final Logger log = Logger.getLogger(AddressUtil.class);
static public InetSocketAddress parseAddress(String address, int defaultPort) throws NumberFormatException {
final String[] parts = address.split(":", 2);
if (parts.length == 2) {
if (parts[1].isEmpty())
return new InetSocketAddress(parts[0], defaultPort);
return new InetSocketAddress(parts[0], Integer.parseInt(parts[1]));
}
return new InetSocketAddress(address, defaultPort);
}
static public InetSocketAddress parseAddress(Text address, int defaultPort) {
return parseAddress(address.toString(), defaultPort);
}
static public TSocket createTSocket(String address, int defaultPort) {
InetSocketAddress addr = parseAddress(address, defaultPort);
return new TSocket(addr.getHostName(), addr.getPort());
}
static public String toString(InetSocketAddress addr) {
return addr.getAddress().getHostAddress() + ":" + addr.getPort();
}
/**
* Fetch the security value that determines how long DNS failures are cached.
* Looks up the security property 'networkaddress.cache.negative.ttl'. Should that fail returns
* the default value used in the Oracle JVM 1.4+, which is 10 seconds.
*
* @param originalException the host lookup that is the source of needing this lookup. maybe be null.
* @return positive integer number of seconds
* @see InetAddress
* @throws IllegalArgumentException if dns failures are cached forever
*/
static public int getAddressCacheNegativeTtl(UnknownHostException originalException) {
int negativeTtl = 10;
try {
negativeTtl = Integer.parseInt(Security.getProperty("networkaddress.cache.negative.ttl"));
} catch (NumberFormatException exception) {
log.warn("Failed to get JVM negative DNS respones cache TTL due to format problem (e.g. this JVM might not have the " +
"property). Falling back to default based on Oracle JVM 1.6 (10s)", exception);
} catch (SecurityException exception) {
log.warn("Failed to get JVM negative DNS response cache TTL due to security manager. Falling back to default based on Oracle JVM 1.6 (10s)", exception);
}
if (-1 == negativeTtl) {
log.error("JVM negative DNS repsonse cache TTL is set to 'forever' and host lookup failed. TTL can be changed with security property " +
"'networkaddress.cache.negative.ttl', see java.net.InetAddress.", originalException);
throw new IllegalArgumentException(originalException);
} else if (0 > negativeTtl) {
log.warn("JVM specified negative DNS response cache TTL was negative (and not 'forever'). Falling back to default based on Oracle JVM 1.6 (10s)");
negativeTtl = 10;
}
return negativeTtl;
}
}