Skip to main content
This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (pypi.python.org).
Help us improve Python packaging - Donate today!

Provides maildir like access to files

Project Description

The filestore is an easy way to to process files with multiple processes without needing locks.

Initialize a FileStore

Create a filestore in a temporary area:

>>> import tempfile
>>> store_dir = tempfile.mkdtemp()
>>> from gocept.filestore import FileStore
>>> filestore = FileStore(store_dir)
>>> filestore
<gocept.filestore.filestore.FileStore object at 0x...>

So far nothing has happend:

>>> import os
>>> os.listdir(store_dir)
[]

Before using the store we need to prepare it:

>>> filestore.prepare()

Prepare has created the tmp/new/cur directory structure:

>>> sorted(os.listdir(store_dir))
['cur', 'new', 'tmp']

Calling prepare again does nothing:

>>> filestore.prepare()
>>> sorted(os.listdir(store_dir))
['cur', 'new', 'tmp']

Use a FileStore

Adding files to the store works with the create method:

>>> f = filestore.create('a-file')

Files are created in the ‘tmp’ area with the ‘w’ mode (if not specified):

>>> f
<open file '.../tmp/a-file', mode 'w' at 0x...>

We find the file in the tmp area. Note that filestore.list lists files with their full path names, so we could feed the name directly to file/open:

>>> filestore.list('tmp')
['.../tmp/a-file']

We got a plain file back, so write to it:

>>> f.write('Die Ente bleibt draussen!')
>>> f.close()

We have finished writing our file, so we can move it to the new space for other applications to pick it up:

>>> filestore.move('a-file', 'tmp', 'new')
>>> filestore.list('tmp')
[]
>>> filestore.list('new')
['.../new/a-file']

The move operation uses os.move which is supposed to be atomic. When another processes “sees” the file it can directly work with it and move it to ‘cur’:

>>> filestore.move('a-file', 'new', 'cur')
>>> filestore.list('new')
[]
>>> filestore.list('cur')
['.../cur/a-file']

Files can be copied, too:

>>> filestore.copy('a-file', 'cur', 'tmp')
>>> filestore.list('cur')
['.../cur/a-file']
>>> filestore.list('tmp')
['.../tmp/a-file']

Cleanup

Remove the temporary directory after testing:

>>> import shutil
>>> shutil.rmtree(store_dir)
Release History

Release History

This version
History Node

0.3

History Node

0.2

Download Files

Download Files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
gocept.filestore-0.3.tar.gz (4.5 kB) Copy SHA256 Checksum SHA256 Source Oct 8, 2009

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting