39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
"""Simple class (acting as a singleton) to handle processes listing"""
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import logging
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import typing
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from subprocess import PIPE, CalledProcessError, check_output
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from archey.singleton import Singleton
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class Processes(metaclass=Singleton):
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"""At startup, instantiate this class to populate a list of running processes"""
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def __init__(self):
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self._processes: typing.List[str]
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try:
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ps_output = check_output(["ps", "-eo", "comm"], stderr=PIPE, universal_newlines=True)
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except FileNotFoundError:
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self._processes = []
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logging.warning("`procps` (or `procps-ng`) couldn't be found on your system.")
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except CalledProcessError as process_error:
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self._processes = []
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logging.warning(
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"This implementation of `ps` might not be supported : %s", process_error.stderr
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)
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else:
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# Discard first heading line here.
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self._processes = ps_output.splitlines()[1:]
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@property
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def list(self) -> tuple:
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"""Simple getter to retrieve (am immutable copy of) the processes list"""
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return tuple(self._processes)
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@property
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def number(self) -> int:
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"""Simple getter to retrieve the number of stored processes"""
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return len(self._processes)
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