""" Decorators and wrappers used throughout GloMPO. """
import importlib
import inspect
import sys
import warnings
from functools import wraps
from pathlib import Path
[docs]def process_print_redirect(opt_id, working_dir, func):
""" Redirects a process' output to a text file in a designated directory. """
@wraps(func)
def wrapper(*args, **kwargs):
sys.stdout = Path(working_dir, "glompo_optimizer_printstreams", f"printstream_{opt_id:04}.out").open("w")
sys.stderr = Path(working_dir, "glompo_optimizer_printstreams", f"printstream_{opt_id:04}.err").open("w")
func(*args, **kwargs)
sys.stdout.close()
sys.stderr.close()
return wrapper
[docs]def catch_user_interrupt(func):
""" Catches a :exc:`KeyboardInterrupt` signal and exits gracefully. """
@wraps(func)
def wrapper(*args, **kwargs):
try:
return func(*args, **kwargs)
except KeyboardInterrupt:
print("Interrupt signal received. Process stopping.")
return wrapper
[docs]def decorate_all_methods(decorator):
""" Applies `decorator` to every method in a class. """
def apply_decorator(cls):
for key, func in cls.__dict__.items():
if inspect.isfunction(func):
setattr(cls, key, decorator(func))
return cls
return apply_decorator
[docs]def needs_optional_package(package: str):
""" Checks `package` requirement before running a function.
Will warn and not allow a function to execute if the `package` it requires is not available to the system. Applied
to functions which provide optional GloMPO functionality.
"""
def decorator(func):
@wraps(func)
def wrapper(*args, **kwargs):
try:
importlib.import_module(package)
return func(*args, **kwargs)
except (ModuleNotFoundError, ImportError):
warnings.warn(f"Unable to construct checkpoint without {package} package installed.", ResourceWarning)
return None
return wrapper
return decorator