Flashbag (flash messages) support for aiohttp.web
Project description
The library provides flashbag for aiohttp.web.
Usage
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.
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