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| import os | |
| import sys | |
| from typing import Any, Dict | |
| # Avoid "LookupError: unknown encoding: ascii" when open() called in a destructor | |
| outnull_file = open(os.devnull, "w") | |
| errnull_file = open(os.devnull, "w") | |
| STDOUT_FILENO = 1 | |
| STDERR_FILENO = 2 | |
| class suppress_stdout_stderr(object): | |
| # NOTE: these must be "saved" here to avoid exceptions when using | |
| # this context manager inside of a __del__ method | |
| sys = sys | |
| os = os | |
| def __init__(self, disable: bool = True): | |
| self.disable = disable | |
| # Oddly enough this works better than the contextlib version | |
| def __enter__(self): | |
| if self.disable: | |
| return self | |
| self.old_stdout_fileno_undup = STDOUT_FILENO | |
| self.old_stderr_fileno_undup = STDERR_FILENO | |
| self.old_stdout_fileno = self.os.dup(self.old_stdout_fileno_undup) | |
| self.old_stderr_fileno = self.os.dup(self.old_stderr_fileno_undup) | |
| self.old_stdout = self.sys.stdout | |
| self.old_stderr = self.sys.stderr | |
| self.os.dup2(outnull_file.fileno(), self.old_stdout_fileno_undup) | |
| self.os.dup2(errnull_file.fileno(), self.old_stderr_fileno_undup) | |
| self.sys.stdout = outnull_file | |
| self.sys.stderr = errnull_file | |
| return self | |
| def __exit__(self, *_): | |
| if self.disable: | |
| return | |
| # Check if sys.stdout and sys.stderr have fileno method | |
| self.sys.stdout = self.old_stdout | |
| self.sys.stderr = self.old_stderr | |
| self.os.dup2(self.old_stdout_fileno, self.old_stdout_fileno_undup) | |
| self.os.dup2(self.old_stderr_fileno, self.old_stderr_fileno_undup) | |
| self.os.close(self.old_stdout_fileno) | |
| self.os.close(self.old_stderr_fileno) | |
| class MetaSingleton(type): | |
| """ | |
| Metaclass for implementing the Singleton pattern. | |
| """ | |
| _instances: Dict[type, Any] = {} | |
| def __call__(cls, *args: Any, **kwargs: Any) -> Any: | |
| if cls not in cls._instances: | |
| cls._instances[cls] = super(MetaSingleton, cls).__call__(*args, **kwargs) | |
| return cls._instances[cls] | |
| class Singleton(object, metaclass=MetaSingleton): | |
| """ | |
| Base class for implementing the Singleton pattern. | |
| """ | |
| def __init__(self): | |
| super(Singleton, self).__init__() | |