RE: Cannot process zip file with Groovy

MY first thought was “are you SURE it is a kosher Zip file?”

Sometimes one gets ‘odd’ gzip files masquerading as plain zip files.

Also, apparently “java.util.Zip does not support DEFLATE64 compression method.” : https://www.ibm.com/support/pages/zip-file-fails-route-invalid-compression-method-error

IF this is the case, you may need to use: https://commons.apache.org/proper/commons-compress/zip.html
(maybe worth looking at the “Known Interoperability Problems” section of the above doc)

May be helpful: https://stackoverflow.com/a/76321625

HTH

BOB

From: James McMahon <[email protected]>
Sent: Saturday, February 17, 2024 4:20 AM
To: [email protected]
Subject: Re: Cannot process zip file with Groovy

Hello Paul, and thanks again for taking a moment to look at this. I tried as you suggested:
- - - - - - - - - -
import java.util.zip.ZipInputStream

def ff = session.get()
if (!ff) return

try {
    ff = session.write(ff, { inputStream, outputStream ->
        def zipInputStream = new ZipInputStream(inputStream)
        def entry = zipInputStream.getNextEntry()
        while (entry != null) {
            entry = zipInputStream.getNextEntry()
        }
        outputStream = inputStream
    } as StreamCallback)

    session.transfer(ff, REL_SUCCESS)
} catch (Exception e) {
    log.error('Error occurred processing FlowFile', e)
    session.transfer(ff, REL_FAILURE)
}
- - - - - - - - - -

Once again it threw this error and failed:


ExecuteScript[id=ae3e5de5-018d-1000-ff81-b0c807b75086] Error occurred processing FlowFile: org.apache.nifi.processor.exception.ProcessException: IOException thrown from ExecuteScript[id=ae3e5de5-018d-1000-ff81-b0c807b75086]: java.util.zip.ZipException: invalid compression method

- Caused by: java.util.zip.ZipException: invalid compression method



It bears repeating: I am able to list and unzip the file at the linux command line, but cannot get it to work from the script.



What is interesting (and a little frustrating) is that the NiFi UnpackContent will successfully unzip the zip file. However, the reason I am trying to do it in Groovy is that UnpackContent exposes the file metadata for each file in a tar archive - lastModifiedDate, for example - but it does not do so for files extracted from zips. And I need that metadata. So here I be.



Can I explicitly set my (de)compression in the Groovy script? Where would I do that, and what values does one typically encounter for zip compression?



Jim

On Thu, Feb 15, 2024 at 9:26 PM Paul King <[email protected]<mailto:[email protected]>> wrote:
What you are doing to read the zip looks okay.

Just a guess, but it could be that because you haven't written to the
output stream, it is essentially a corrupt data stream as far as NiFi
processing is concerned. What happens if you set "outputStream =
inputStream" as the last line of your callback?

Paul.

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On Fri, Feb 16, 2024 at 8:48 AM James McMahon <[email protected]<mailto:[email protected]>> wrote:
>
> I am struggling to build a Groovy scri[t I can run from a NiFi ExecuteScript processor to extract from a zip file and stream to a tar archive.
>
> I tried to tackle it all at once and made little progress.
> I am now just trying to read the zip file, and am getting this error:
>
> ExecuteScript[id=ae3e5de5-018d-1000-ff81-b0c807b75086] Error occurred processing FlowFile: org.apache.nifi.processor.exception.ProcessException: IOException thrown from ExecuteScript[id=ae3e5de5-018d-1000-ff81-b0c807b75086]: java.util.zip.ZipException: invalid compression method
> - Caused by: java.util.zip.ZipException: invalid compression method
>
>
> This is my simplified code:
>
>
> import java.util.zip.ZipInputStream
>
> def ff = session.get()
> if (!ff) return
>
> try {
>     ff = session.write(ff, { inputStream, outputStream ->
>         def zipInputStream = new ZipInputStream(inputStream)
>         def entry = zipInputStream.getNextEntry()
>         while (entry != null) {
>             entry = zipInputStream.getNextEntry()
>         }
>     } as StreamCallback)
>
>     session.transfer(ff, REL_SUCCESS)
> } catch (Exception e) {
>     log.error('Error occurred processing FlowFile', e)
>     session.transfer(ff, REL_FAILURE)
> }
>
>
> I am able to list and unzip the file at the linux command line, but cannot get it to work from the script.
>
>
> Has anyone had success doing this? Can anyone help me get past this error?
>
>
> Thanks in advance.
>
> Jim
>
>