53 lines
1.5 KiB
Python
Executable file
53 lines
1.5 KiB
Python
Executable file
#!/usr/bin/env python3
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"""
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Example of serving an Application using the `aiohttp.web` CLI.
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Serve this app using::
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$ python -m aiohttp.web -H localhost -P 8080 --repeat 10 cli_app:init \
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> "Hello World"
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Here ``--repeat`` & ``"Hello World"`` are application specific command-line
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arguments. `aiohttp.web` only parses & consumes the command-line arguments it
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needs (i.e. ``-H``, ``-P`` & ``entry-func``) and passes on any additional
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arguments to the `cli_app:init` function for processing.
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"""
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from argparse import ArgumentParser, Namespace
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from aiohttp import web
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args_key = web.AppKey("args_key", Namespace)
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async def display_message(req: web.Request) -> web.StreamResponse:
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args = req.app[args_key]
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text = "\n".join([args.message] * args.repeat)
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return web.Response(text=text)
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def init(argv):
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arg_parser = ArgumentParser(
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prog="aiohttp.web ...", description="Application CLI", add_help=False
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)
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# Positional argument
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arg_parser.add_argument("message", help="message to print")
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# Optional argument
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arg_parser.add_argument(
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"--repeat", help="number of times to repeat message", type=int, default="1"
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)
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# Avoid conflict with -h from `aiohttp.web` CLI parser
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arg_parser.add_argument(
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"--app-help", help="show this message and exit", action="help"
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)
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args = arg_parser.parse_args(argv)
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app = web.Application()
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app[args_key] = args
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app.router.add_get("/", display_message)
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return app
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