Created
May 8, 2024 12:05
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An example of stateful handler with geberator based continuations.
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| import uuid | |
| from aiohttp import web | |
| CONTS = {} | |
| async def handle(request: web.Request) -> web.Response: | |
| k = request.query.get("cont") | |
| if k is None: | |
| key = uuid.uuid4().hex | |
| cont = wizard(request, key) | |
| CONTS[key] = cont | |
| return await anext(cont) | |
| elif (cont := CONTS.get(k)) is not None: | |
| return await cont.asend(request) # TODO: handle StopIteration | |
| raise web.HTTPNotFound(text="Bad session") | |
| async def wizard(_: web.Request, key: str): | |
| req = yield web.Response(text=f"""<!DOCTYPE html> | |
| <html lang="en"> | |
| <body> | |
| <h2>Welcome to aioh-cont</h2> | |
| <form action="/"> | |
| <input name="cont" value="{key}" hidden> | |
| <label for="name">Name:</label> | |
| <input name="name"> | |
| <input type="submit"> | |
| </form> | |
| </body> | |
| </html> | |
| """ , content_type="text/html") | |
| name = req.query['name'] | |
| yield web.Response(text=f"""<!DOCTYPE html> | |
| <html lang="en"> | |
| <body> | |
| <h2>Hello, {name}!</h2> | |
| <a href="/">Again</a> | |
| </body> | |
| </html>""" , content_type="text/html") | |
| app = web.Application() | |
| app.router.add_route('GET', '/', handle) | |
| if __name__ == '__main__': | |
| web.run_app(app) |
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