def load_extensions(default, extensions, strict, environ, reload=False):
"""Load all of the given extensions. This should be called by run_algo
or the cli.
Parameters
----------
default : bool
Load the default exension (~/.catalyst/extension.py)?
extension : iterable[str]
The paths to the extensions to load. If the path ends in ``.py`` it is
treated as a script and executed. If it does not end in ``.py`` it is
treated as a module to be imported.
strict : bool
Should failure to load an extension raise. If this is false it will
still warn.
environ : mapping
The environment to use to find the default extension path.
reload : bool, optional
Reload any extensions that have already been loaded.
"""
if default:
default_extension_path = pth.default_extension(environ=environ)
pth.ensure_file(default_extension_path)
# put the default extension first so other extensions can depend on
# the order they are loaded
extensions = concatv([default_extension_path], extensions)
for ext in extensions:
if ext in _loaded_extensions and not reload:
continue
try:
# load all of the catalyst extensionss
if ext.endswith('.py'):
run_path(ext, run_name='<extension>')
else:
__import__(ext)
except Exception as e:
if strict:
# if `strict` we should raise the actual exception and fail
raise
# without `strict` we should just log the failure
warnings.warn(
'Failed to load extension: %r\n%s' % (ext, e),
stacklevel=2
)
else:
_loaded_extensions.add(ext)
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