def __init__(self, config):
self.keys = Dynamic()
self.defaults = Dynamic()
self.config = config
if hasattr(config, 'get_settings'):
self.settings = config.get_settings()
else:
self.settings = config
class Extension(object):
""" A helper module for writing pyramid extensions
You can easily use it like this:
from nark.pyramid import Extension
class Config(Extension):
def __init__(self, config):
super(Config, self).__init__(config)
self.keys.ROOT = 'pyramid_admin.root'
self.keys.OVERRIDE = 'pyramid_admin.override'
self.defaults.ROOT = 'home'
Then invoke this from the extension like:
def includeme(config):
ext = Config(config)
root = ext.resolve(ext.keys.ROOT, required=True)
config.add_route(...)
module = ext.resolve(ext.keys.PERMISSIONS, as_module=True)
if module is not None:
...
"""
def __init__(self, config):
self.keys = Dynamic()
self.defaults = Dynamic()
self.config = config
if hasattr(config, 'get_settings'):
self.settings = config.get_settings()
else:
self.settings = config
def _default(self, key):
"""Override this function to provide defaults for types """
for v in self.keys.keys():
if key == self.keys[v]:
key = v
if key in self.defaults:
return self.defaults[key]
return None
def resolve(self, key, as_module=False, required=False):
"""Import a named type or fallback to the default """
def fail(msg, failure=None):
if required:
raise RequiredConfigError(msg)
elif failure is not None:
logging.warn(msg)
logging.warn(failure)
if as_module:
try:
key = self.settings[key]
mod, func = key.rsplit('.', 1)
loaded = importlib.import_module(mod)
return getattr(loaded, func)
except ImportError as e:
fail('Failed to import binding for {}'.format(key), e)
except ValueError as e:
fail('Invalid binding for {}'.format(key), e)
except AttributeError as e:
fail('Invalid binding for {}'.format(key), e)
except KeyError:
fail('No config binding for {}'.format(key))
else:
try:
return self.settings[key]
except KeyError:
fail('No config binding for {}'.format(key))
return self._default(key)
