$ pip install falcon
$ python3 app.py
alternatively with Gunicorn (for HTTP/1.1):
$ pip install gunicorn
$ gunicorn app:app
Last active
August 30, 2024 04:42
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Falcon WSGI application with asyncio
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| from asyncio import Future, Task, coroutine as async, sleep | |
| from random import randint | |
| def retrieve(*uris): | |
| res = Future() | |
| responses = [] | |
| def conclude(response): | |
| responses.append(response) | |
| if len(responses) == len(uris): | |
| res.set_result(responses) | |
| for uri in uris: | |
| task = Task(fetch(uri)) | |
| task.add_done_callback(lambda task: conclude(task.result())) | |
| return res | |
| @async | |
| def fetch(uri): | |
| print("retrieving %s..." % uri) | |
| lag = yield from _http() | |
| lag = lag * 1000 | |
| print("downloaded %s in %d ms" % (uri, lag)) | |
| return "[%d ms] %s" % (lag, uri) | |
| @async | |
| def _http(): | |
| lag = randint(2, 9) * 0.1 | |
| yield from sleep(lag) | |
| return lag |
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| import asyncio | |
| import falcon | |
| import aggregator | |
| from wsgiref import simple_server | |
| class Frontpage: | |
| def on_get(self, req, res): | |
| service_requests = aggregator.retrieve("http://example.org/foo", | |
| "http://example.org/bar", "http://example.org/baz") | |
| loop = asyncio.get_event_loop() | |
| loop.run_until_complete(service_requests) | |
| results = service_requests.result() | |
| res.body = "%s\n" % "\n".join(results) | |
| app = falcon.API() | |
| app.add_route("/", Frontpage()) | |
| if __name__ == "__main__": | |
| server = simple_server.make_server("localhost", 8000, app) | |
| server.serve_forever() |
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