Move web_main.py content to web.py

aiohttp/web.py

@@ -16,6 +16,9 @@
 from .web_exceptions import *  # noqa
 from .web_urldispatcher import *  # noqa
 from .web_ws import *  # noqa
+from argparse import ArgumentParser
+from importlib import import_module
+
 
 __all__ = (web_reqrep.__all__ +
            web_exceptions.__all__ +
@@ -322,6 +325,45 @@ def run_app(app, *, host='0.0.0.0', port=None,
         loop.run_until_complete(app.cleanup())
     loop.close()
 
+
+def main():
+    arg_parser = ArgumentParser(
+        description="aiohttp.web TCP/IP Application server",
+        prog="aiohttp.web"
+    )
+    arg_parser.add_argument(
+        "entry_func",
+        help=("Callable returning the `aiohttp.web.Application` instance to "
+              "run. Should be specified in the Python import syntax, "
+              "e.g. 'package.module.function')"),
+        metavar="entry-func"
+    )
+    arg_parser.add_argument(
+        "-n", "--hostname",
+        help="TCP/IP hostname to serve on (default: %(default)r)",
+        default="localhost"
+    )
+    arg_parser.add_argument(
+        "-p", "--port",
+        help="TCP/IP port to serve on (default: %(default)r)",
+        type=int,
+        default="8080"
+    )
+    args, extra_args = arg_parser.parse_known_args()
+
+    # Import logic
+    mod_str, _, func_str = args.entry_func.rpartition(".")
+    try:
+        module = import_module(mod_str)
+        func = getattr(module, func_str)
+    except (ImportError, ValueError) as e:
+        arg_parser.error(e)
+    except AttributeError as e:
+        arg_parser.error(e)
+
+    app = func(extra_args)
+    run_app(app, host=args.hostname, port=args.port)
+    arg_parser.exit(message="Stopped\n")
+
 if __name__ == "__main__":
-    from .web_main import main
     main()