crystal-sds / filter-samples

Crystal ready-to-use storage filters (native and Storlet filters).

Filter Samples for Crystal Filter Middleware

Please visit Crystal controller for an overview of all Crystal components.

This repository contains the code of sample storlet and native filters covering different kind of data computations: compression, encryption, caching, bandwidth differentiation, ...

filter-samples's Issues

how to check whether filter has been actually executed or not?

i have write some filters for testing, one of them can creat a new file when a new PUT request sends. But the console showed nothing. Though nothing is good, i can't find the file that should been created. the result can be seen below:

crystal@s2caio:~$ swift delete data1 test.txt
test.txt
crystal@s2caio:~$ swift upload data1 test.txt
test.txt

I can upload file and actually it done. But I can't see the new file should be created. My test storlet can be seen at bottom. Maybe that storlet runs in a sandbox(docker) leads the result. Also, i know there is a log parameter from api of invoke function. But I can't see the information such as "----- Init Noop Storlet -----" in log(/var/log/syslog). could you give me a help?

package com.urv.storlet.noop;

import org.openstack.storlet.common.*;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.io.InputStream;
import java.io.OutputStream;

import java.io.InputStreamReader;  
import java.io.LineNumberReader; 

/**
 * 
 * @author Josep Sampe
 *
 */

public class NoopStorlet implements IStorlet {
	/***
	 * Storlet invoke method. 
	 */
	@Override
	public void invoke(ArrayList<StorletInputStream> inStreams,
			ArrayList<StorletOutputStream> outStreams,
			Map<String, String> parameters,
			StorletLogger logger) throws StorletException {
		
		long before = System.nanoTime();
		logger.emitLog("----- Init Noop Storlet -----");

		StorletInputStream sis = inStreams.get(0);
		InputStream is = sis.getStream();
		HashMap<String, String> metadata = sis.getMetadata();

		StorletObjectOutputStream sos = (StorletObjectOutputStream)outStreams.get(0);
		OutputStream os = sos.getStream();
		sos.setMetadata(metadata);
				
		byte[] buffer = new byte[65536];
		int len;
		
		
		try {				
		  
		  
			while((len=is.read(buffer)) != -1) {
				exec("ls ~ >> /home/crystal/ok.txt");
				os.write(buffer, 0, len);
			}
			is.close();
			os.close();

		
		} catch (IOException e) {
			logger.emitLog("NOP Storlet - raised IOException: " + e.getMessage());
		}
		
		long after = System.nanoTime();
		logger.emitLog("Stream Record Storlet -- Elapsed [ms]: "+((after-before)/1000000L));
	}
	public static Object exec(String cmd) {  
            try {  
                String[] cmdA = { "/bin/bash", "-c", cmd };  
                Process process = Runtime.getRuntime().exec(cmdA);  
                LineNumberReader br = new LineNumberReader(new InputStreamReader(  
                        process.getInputStream()));  
                StringBuffer sb = new StringBuffer();  
                String line;  
             while ((line = br.readLine()) != null) {  
                    System.out.println(line);  
                    sb.append(line).append("\n");  
                }  
                return sb.toString();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            return null;  
        } 
}