The library provides flashbag for aiohttp.web.
The library allows us to share some data between requests inside session.
Basic usage example:
import aiohttp_flashbag
from aiohttp import web
from aiohttp_session import setup as setup_session
from aiohttp_session import SimpleCookieStorage
async def handler_get(request):
validation_error = aiohttp_flashbag.flashbag_get(request, 'error')
error_html = ''
if validation_error is not None:
error_html = '<span>{validation_error}</span>'.format(
validation_error=validation_error,
)
body = '''
<html>
<head><title>aiohttp_flashbag demo</title></head>
<body>
<form method="POST" action="/">
<input type="text" name="name" />
{error_html}
<input type="submit" value="Say hello">
</form>
</body>
</html>
'''
body = body.format(error_html=error_html)
return web.Response(body=body.encode('utf-8'), content_type='text/html')
async def handler_post(request):
post = await request.post()
if len(post['name']) == 0:
aiohttp_flashbag.flashbag_set(request, 'error', 'Name is required')
return web.HTTPSeeOther('/')
body = 'Hello, {name}'.format(name=post['name'])
return web.Response(body=body.encode('utf-8'), content_type='text/html')
def make_app():
session_storage = SimpleCookieStorage()
app = web.Application()
setup_session(app, session_storage)
app.middlewares.append(aiohttp_flashbag.flashbag_middleware)
app.router.add_route(
'GET',
'/',
handler_get,
)
app.router.add_route(
'POST',
'/',
handler_post,
)
return app
web.run_app(make_app())First of all, you have to register aiohttp_flashbag.flashbag_middleware in aiohttp.web.Application.
You can get some data from the previous request with aiohttp_flashbag.flashbag_get method. Parameters:
- request. Instance of
aiohttp.web_request.Request. - key. Name of "variable" that you want to get
- default. The default value that should be returned, if the key doesn't exist in session flashbag.
To set one "variable" in flashbag you should use aiohttp_flashbag.flashbag_set. Parameters:
- request. Instance of
aiohttp.web_request.Request. - key. Name of "variable" that you want to specify.
- value. Data that you want to specify.
If you need to replace all "variables" in flashbag you should use aiohttp_flashbag.flashbag_replace_all. Parameters:
- request. Instance of
aiohttp.web_request.Request. - value. Dict with values that you want to add into flashbag.