Re: [Ryu-devel] CLI arguments for an app

[Wei-Li T. <al...@xi...>]

Hello Tom,

CLI option should be registered before CONF being initialized in
cmd/manager.py. You can simply import your app in cmd/manager.py in advance
as below:

diff --git a/ryu/cmd/manager.py b/ryu/cmd/manager.py
index 4710547..a9d5101 100755
--- a/ryu/cmd/manager.py
+++ b/ryu/cmd/manager.py
@@ -41,6 +41,7 @@ from ryu.app import wsgi
 from ryu.base.app_manager import AppManager
 from ryu.controller import controller
 from ryu.topology import switches
+from ryu.app import myapp


 CONF = cfg.CONF


2014-05-28 7:59 GMT+08:00 Thomas F Herbert <tho...@gm...>:

> Ryu experts,
>
> I have a question,
>
> I am writing a ryu app. Is there a way to add command line configuration
> arguments when writing an app?
>
> I tried the following also used in wsgi.py app but it didn't work.
>
> from ryu import cfg
>
> CONF = cfg.CONF
> CONF.register_cli_opts([
>      cfg.StrOpt('policy', default='block', help = 'Policy: One of A, B,
> C, C'),
>      cfg.StrOpt('NetworkMask', default='192.168.1.1/24', help = 'Network
> Gateway and netmask '),
> ])
>
> ...
>
>
> I got this error from oslo.
>
> t@Ryu:~/ryu$ PYTHONPATH=. ./bin/ryu-manager ryu/app/myapp.py
> loading app ryu/app/myapp.py
> Traceback (most recent call last):
>    File "./bin/ryu-manager", line 19, in <module>
>      main()
>    File "/home/therbert/ryu/ryu/cmd/manager.py", line 72, in main
>      app_mgr.load_apps(app_lists)
>    File "/home/therbert/ryu/ryu/base/app_manager.py", line 340, in
> load_apps
>      cls = self.load_app(app_cls_name)
>    File "/home/therbert/ryu/ryu/base/app_manager.py", line 324, in load_app
>      mod = utils.import_module(name)
>    File "/home/therbert/ryu/ryu/utils.py", line 86, in import_module
>      __import__(name)
>    File "/home/therbert/ryu/ryu/app/mordred.py", line 51, in <module>
>      cfg.StrOpt('NetworkMask', default='192.168.1.1/24', help = 'Network
> Gateway and netmask '),
>    File "/usr/local/lib/python2.7/dist-packages/oslo/config/cfg.py",
> line 1547, in __inner
>      result = f(self, *args, **kwargs)
>    File "/usr/local/lib/python2.7/dist-packages/oslo/config/cfg.py",
> line 1711, in register_cli_opts
>      self.register_cli_opt(opt, group, clear_cache=False)
>    File "/usr/local/lib/python2.7/dist-packages/oslo/config/cfg.py",
> line 1551, in __inner
>      return f(self, *args, **kwargs)
>    File "/usr/local/lib/python2.7/dist-packages/oslo/config/cfg.py",
> line 1703, in register_cli_opt
>      raise ArgsAlreadyParsedError("cannot register CLI option")
> oslo.config.cfg.ArgsAlreadyParsedError: arguments already parsed: cannot
> register CLI option
>
> Thanks in advance,
>
> --Tom
>
>
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-- 
Sincerely,

Wei-Li Tang
System Engineer, Xinguard Inc.