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https://github.com/allanlei/python-zipstream

Like Python's ZipFile module, except it works as a generator that provides the file in many small chunks.
https://github.com/allanlei/python-zipstream

python stream zip

Last synced: 30 days ago
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Like Python's ZipFile module, except it works as a generator that provides the file in many small chunks.

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README 

        

# python-zipstream



[![Build Status](https://travis-ci.org/allanlei/python-zipstream.png?branch=master)](https://travis-ci.org/allanlei/python-zipstream)

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zipstream.py is a zip archive generator based on python 3.3's zipfile.py. It was created to

generate a zip file generator for streaming (ie web apps). This is beneficial for when you

want to provide a downloadable archive of a large collection of regular files, which would be infeasible to

generate the archive prior to downloading or of a very large file that you do not want to store entirely on disk or on memory.



The archive is generated as an iterator of strings, which, when joined, form

the zip archive. For example, the following code snippet would write a zip

archive containing files from 'path' to a normal file:



```python

import zipstream



z = zipstream.ZipFile()

z.write('path/to/files')



with open('zipfile.zip', 'wb') as f:

    for data in z:

        f.write(data)

```



zipstream also allows to take as input a byte string iterable and to generate

the archive as an iterator.

This avoids storing large files on disk or in memory.

To do so you could use something like this snippet:



```python

def iterable():

    for _ in xrange(10):

        yield b'this is a byte string\x01\n'



z = zipstream.ZipFile()

z.write_iter('my_archive_iter', iterable())



with open('zipfile.zip', 'wb') as f:

    for data in z:

        f.write(data)

```



Of course both approach can be combined:



```python

def iterable():

    for _ in xrange(10):

        yield b'this is a byte string\x01\n'



z = zipstream.ZipFile()

z.write('path/to/files', 'my_archive_files')

z.write_iter('my_archive_iter', iterable())



with open('zipfile.zip', 'wb') as f:

    for data in z:

        f.write(data)

```



Since recent versions of web.py support returning iterators of strings to be

sent to the browser, to download a dynamically generated archive, you could

use something like this snippet:



```python

def GET(self):

    path = '/path/to/dir/of/files'

    zip_filename = 'files.zip'

    web.header('Content-type' , 'application/zip')

    web.header('Content-Disposition', 'attachment; filename="%s"' % (

        zip_filename,))

    return zipstream.ZipFile(path)

```



If the zlib module is available, zipstream.ZipFile can generate compressed zip

archives.



## Installation



```

pip install zipstream

```



## Requirements



  * Python 2.6, 2.7, 3.2, 3.3, pypy



## Examples



### flask



```python

from flask import Response



@app.route('/package.zip', methods=['GET'], endpoint='zipball')

def zipball():

    def generator():

        z = zipstream.ZipFile(mode='w', compression=ZIP_DEFLATED)



        z.write('/path/to/file')



        for chunk in z:

            yield chunk



    response = Response(generator(), mimetype='application/zip')

    response.headers['Content-Disposition'] = 'attachment; filename={}'.format('files.zip')

    return response



# or



@app.route('/package.zip', methods=['GET'], endpoint='zipball')

def zipball():

    z = zipstream.ZipFile(mode='w', compression=ZIP_DEFLATED)

    z.write('/path/to/file')



    response = Response(z, mimetype='application/zip')

    response.headers['Content-Disposition'] = 'attachment; filename={}'.format('files.zip')

    return response

```



### django 1.5+



```python

from django.http import StreamingHttpResponse



def zipball(request):

    z = zipstream.ZipFile(mode='w', compression=ZIP_DEFLATED)

    z.write('/path/to/file')



    response = StreamingHttpResponse(z, content_type='application/zip')

    response['Content-Disposition'] = 'attachment; filename={}'.format('files.zip')

    return response

```



### webpy



```python

def GET(self):

    path = '/path/to/dir/of/files'

    zip_filename = 'files.zip'

    web.header('Content-type' , 'application/zip')

    web.header('Content-Disposition', 'attachment; filename="%s"' % (

        zip_filename,))

    return zipstream.ZipFile(path)

```



## Running tests



With python version > 2.6, just run the following command: `python -m unittest discover`



Alternatively, you can use `nose`.