This buildout uses WebOb to help creating a minimal WSGI
application.
Create a minimal filesystem structure:
cd /PATH/TO/EXAMPLE
mkdir --parents src/helloworld
touch src/helloworld/__init__.py
wget http://python-distribute.org/bootstrap.py
Add file buildout.cfg containing:
[buildout]
parts = helloworld
develop = .
[helloworld]
recipe = zc.recipe.egg:scripts
egg = helloworld
Add file setup.py:
from setuptools import setup, find_packages
setup(name='helloworld',
packages=find_packages('src'),
package_dir = {'': 'src'},
install_requires=['setuptools', 'yafowil.webob'],
entry_points = """\
[console_scripts]
helloworld = helloworld.run:run
"""
)
Add src/helloworld/run.py including a minimal web application, the YAFOWIL
form and a dumb filesystem-based storage:
from yafowil import loader
import yafowil.webob
from yafowil.base import factory
from yafowil.controller import Controller
from webob import Request, Response
address, port = '127.0.0.1', 8080
url = 'http://%s:%s/' % (address, port)
def store(widget, data):
with open('helloworld.txt', 'a') as storage:
storage.write(data.fetch('helloworld.hello').extracted + '\n')
def readall():
try:
with open('helloworld.txt', 'r') as storage:
return reversed(storage.readlines())
except IOError:
return ['Empty storage!']
def next(request):
return url
def application(environ, start_response):
request = Request(environ)
response = Response()
response.write('<html><body><h1>YAFOWIL Demo</h1>')
form = factory(u'form', name='helloworld', props={
'action': url})
form['hello'] = factory('field:label:error:text', props={
'label': 'Enter some text',
'value': '',
'required': True})
form['submit'] = factory('field:submit', props={
'label': 'store value',
'action': 'save',
'handler': store,
'next': next})
controller = Controller(form, request)
response.write(controller.rendered)
response.write('<hr />%s</html></body>' % '<br />'.join(readall()))
return response(environ, start_response)
def run():
from wsgiref.simple_server import make_server
server = make_server(address, port, application)
server.serve_forever()
Now bootstrap and run buildout, and start the application.:
python2.6 bootstrap.py
./bin/buildout
./bin/helloworld
Pointing the browser to http://localhost:8080/ shows the application.
The full working example code is available at github.