redbot/core/_sharedlibdeprecation.py
from importlib.abc import MetaPathFinder
import warnings
class SharedLibDeprecationWarning(DeprecationWarning):
pass
warnings.simplefilter("always", SharedLibDeprecationWarning)
class SharedLibImportWarner(MetaPathFinder):
"""
Deprecation warner for shared libraries. This class sits on `sys.meta_path`
and prints warning if imported module is a shared library
"""
def find_spec(self, fullname, path, target=None) -> None:
"""This is only supposed to print warnings, it won't ever return module spec."""
parts = fullname.split(".")
if parts[0] != "cog_shared" or len(parts) != 2:
return None
msg = (
"One of the cogs uses shared libraries which are"
" deprecated and scheduled for removal in the future.\n"
"You should inform the author(s) of the cog about this message."
)
warnings.warn(msg, SharedLibDeprecationWarning, stacklevel=2)
return None