com.netflix.nfsidecar.utils.SystemUtils Maven / Gradle / Ivy

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/**
 * Copyright 2013 Netflix, Inc.
 *
 * Licensed 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 com.netflix.nfsidecar.utils;

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FilterInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Charsets;


public class SystemUtils
{
    private static final Logger logger = LoggerFactory.getLogger(SystemUtils.class);

    /**
     * REST call
     * @param url
     * @return the response from the HTTP GET
     */
    public static String getDataFromUrl(String url)
    {
        try
        {
            HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
            conn.setConnectTimeout(1000);
            conn.setReadTimeout(1000);
            conn.setRequestMethod("GET");
            if (conn.getResponseCode() != 200)
            {
                throw new RuntimeException("Unable to get data for URL " + url);
            }
            byte[] b = new byte[2048];
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            DataInputStream d = new DataInputStream((FilterInputStream) conn.getContent());
            int c = 0;
            while ((c = d.read(b, 0, b.length)) != -1)
                bos.write(b, 0, c);
            String return_ = new String(bos.toByteArray(), Charsets.UTF_8);
            logger.info("Calling URL API: {} returns: {}", url, return_);
            conn.disconnect();
            return return_;
        }
        catch (Exception ex)
        {
            throw new RuntimeException(ex);
        }

    }

    /**
     * delete all the files/dirs in the given Directory but dont delete the dir
     * itself.
     */
    public static void cleanupDir(String dirPath, List childdirs) throws IOException
    {
        if (childdirs == null || childdirs.size() == 0)
            FileUtils.cleanDirectory(new File(dirPath));
        else
        {
            for (String cdir : childdirs)
                FileUtils.cleanDirectory(new File(dirPath + "/" + cdir));
        }
    }
  
}