def _instantiate(self):
"""Call our type's callable, cache and return the result.
Calling instantiate more than once will return the cached value.
"""
# Needed because this code can run twice even with instance
# caching if we trigger an ComplexInstantiationError.
config = mappings.ProtectedDict(self.config)
# Instantiate section refs.
# Careful: not everything we have for needs to be in the conf dict
# (because of default values) and not everything in the conf dict
# needs to have a type (because of allow_unknowns).
for name, val in config.items():
typename = self.type.types.get(name)
if typename is None:
continue
# central already checked the type, no need to repeat that here.
unlist_it = False
if typename.startswith('ref:'):
val = [val]
unlist_it = True
if typename.startswith('refs:') or unlist_it:
try:
final_val = []
for ref in val:
final_val.append(ref.instantiate())
except IGNORED_EXCEPTIONS:
raise
except Exception as e:
raise errors.ConfigurationError(
f'Instantiating reference {name!r} pointing at {ref.name!r}'
) from e
if unlist_it:
final_val = final_val[0]
config[name] = final_val
if self.type.requires_config:
if self.manager is None:
raise Exception('configuration internal error; '
'requires_config is enabled '
'but we have no config manager to return ')
manager = self.manager()
if manager is None:
raise Exception(
'Configuration internal error, potentially '
'client code error; manager requested, but the config '
'manager is no longer in memory')
config[self.type.requires_config] = manager
callable_obj = self.type.callable
pargs = []
for var in self.type.positional:
pargs.append(config.pop(var))
# Python is basically the worst language ever:
# TypeError: repo() argument after ** must be a dictionary
configdict = dict(config)
try:
self._instance = callable_obj(*pargs, **configdict)
except IGNORED_EXCEPTIONS:
raise
except Exception as e:
source = errors._identify_functor_source(self.type.callable)
raise errors.InstantiationError(
self.name, f'exception caught from {source!r}') from e
if self._instance is None:
raise errors.ComplexInstantiationError('No object returned',
callable_obj=callable_obj,
pargs=pargs,
kwargs=configdict)
return self._instance
def setup_method(self, method):
self.orig = {1: -1, 2: -2}
self.dict = mappings.ProtectedDict(self.orig)
def setUp(self):
self.orig = {1: -1, 2: -2}
self.dict = mappings.ProtectedDict(self.orig)