org.apache.hadoop.util.FileBasedIPList Maven / Gradle / Ivy
/**
* 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.hadoop.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
/**
* FileBasedIPList loads a list of subnets in CIDR format and ip addresses from
* a file.
*
* Given an ip address, isIn method returns true if ip belongs to one of the
* subnets.
*
* Thread safe.
*/
public class FileBasedIPList implements IPList {
private static final Logger LOG =
LoggerFactory.getLogger(FileBasedIPList.class);
private final String fileName;
private final MachineList addressList;
public FileBasedIPList(String fileName) {
this.fileName = fileName;
String[] lines;
try {
lines = readLines(fileName);
} catch (IOException e) {
lines = null;
}
if (lines != null) {
addressList = new MachineList(new HashSet(Arrays.asList(lines)));
} else {
addressList = null;
}
}
public FileBasedIPList reload() {
return new FileBasedIPList(fileName);
}
@Override
public boolean isIn(String ipAddress) {
if (ipAddress == null || addressList == null) {
return false;
}
return addressList.includes(ipAddress);
}
/**
* Reads the lines in a file.
* @param fileName
* @return lines in a String array; null if the file does not exist or if the
* file name is null
* @throws IOException
*/
private static String[] readLines(String fileName) throws IOException {
try {
if (fileName != null) {
File file = new File (fileName);
if (file.exists()) {
try (
Reader fileReader = new InputStreamReader(
Files.newInputStream(file.toPath()), StandardCharsets.UTF_8);
BufferedReader bufferedReader = new BufferedReader(fileReader)) {
List lines = new ArrayList();
String line = null;
while ((line = bufferedReader.readLine()) != null) {
lines.add(line);
}
if (LOG.isDebugEnabled()) {
LOG.debug("Loaded IP list of size = " + lines.size() +
" from file = " + fileName);
}
return (lines.toArray(new String[lines.size()]));
}
} else {
LOG.debug("Missing ip list file : "+ fileName);
}
}
} catch (IOException ioe) {
LOG.error(ioe.toString());
throw ioe;
}
return null;
}
}