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