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import re
import inspect
import os
IDENTIFIER = re.compile(r'[a-z_](\w)*$', re.IGNORECASE)
DEFAULT = {
# Server Specific Configurations
'server' : {
'port' : '8080',
'host' : '0.0.0.0'
},
# Pecan Application Configurations
'app' : {
'root' : None,
'modules' : [],
'static_root' : 'public',
'template_path' : '',
'debug' : False,
'force_canonical' : True,
'errors' : {
'__force_dict__' : True
}
}
}
class ConfigDict(dict):
pass
class Config(object):
'''
Base class for Pecan configurations.
'''
def __init__(self, conf_dict={}, filename=''):
'''
Create a Pecan configuration object from a dictionary or a
filename.
:param conf_dict: A python dictionary to use for the configuration.
:param filename: A filename to use for the configuration.
'''
self.__values__ = {}
self.__file__ = filename
self.update(conf_dict)
def update(self, conf_dict):
'''
Updates this configuration with a dictionary.
:param conf_dict: A python dictionary to update this configuration with.
'''
if isinstance(conf_dict, dict):
iterator = conf_dict.iteritems()
else:
iterator = iter(conf_dict)
for k,v in iterator:
if not IDENTIFIER.match(k):
raise ValueError('\'%s\' is not a valid indentifier' % k)
cur_val = self.__values__.get(k)
if isinstance(cur_val, Config):
cur_val.update(conf_dict[k])
else:
self[k] = conf_dict[k]
def get(self, attribute, default=None):
try:
return self[attribute]
except KeyError:
return default
def __dictify__(self, obj, prefix):
'''
Private helper method for as_dict.
**Do not use directly**
'''
for k, v in obj.items():
if prefix:
del obj[k]
k = "%s%s" % (prefix, k)
if isinstance(v, Config):
v = self.__dictify__(dict(v), prefix)
obj[k] = v
return obj
def as_dict(self, prefix=None):
'''
Converts recursively the Config object into a valid dictionary.
:param prefix: A string to optionally prefix all key elements in the
returned dictonary.
'''
conf_obj = dict(self)
return self.__dictify__(conf_obj, prefix)
def __getattr__(self, name):
try:
return self.__values__[name]
except KeyError:
raise AttributeError, "'pecan.conf' object has no attribute '%s'" % name
def __getitem__(self, key):
return self.__values__[key]
def __setitem__(self, key, value):
if isinstance(value, dict) and not isinstance(value, ConfigDict):
if value.get('__force_dict__'):
del value['__force_dict__']
self.__values__[key] = ConfigDict(value)
else:
self.__values__[key] = Config(value, filename=self.__file__)
elif isinstance(value, basestring) and '%(confdir)s' in value:
confdir = os.path.dirname(self.__file__) or os.getcwd()
self.__values__[key] = value.replace('%(confdir)s', confdir)
else:
self.__values__[key] = value
def __iter__(self):
return self.__values__.iteritems()
def __dir__(self):
"""
When using dir() returns a list of the values in the config. Note: This function only works in Python2.6 or later.
"""
return self.__values__.keys()
def __repr__(self):
return 'Config(%s)' % str(self.__values__)
def conf_from_file(filepath):
'''
Creates a configuration dictionary from a file.
:param filepath: The path to the file.
'''
abspath = os.path.abspath(os.path.expanduser(filepath))
conf_dict = {}
execfile(abspath, globals(), conf_dict)
conf_dict['__file__'] = abspath
return conf_from_dict(conf_dict)
def conf_from_dict(conf_dict):
'''
Creates a configuration dictionary from a dictionary.
:param conf_dict: The configuration dictionary.
'''
conf = Config(filename=conf_dict.get('__file__', ''))
for k,v in conf_dict.iteritems():
if k.startswith('__'):
continue
elif inspect.ismodule(v):
continue
conf[k] = v
return conf
def initconf():
'''
Initializes the default configuration and exposes it at ``pecan.configuration.conf``,
which is also exposed at ``pecan.conf``.
'''
return conf_from_dict(DEFAULT)
def set_config(name, overwrite=False):
'''
Updates the global configuration a filename.
:param name: filename, as a string.
'''
conf = conf_from_file(name)
_runtime_conf.update(conf)
_runtime_conf = initconf()
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