63 lines
2.5 KiB
Python
63 lines
2.5 KiB
Python
import json
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import logging
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import re
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import subprocess
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from mflux.callbacks.callback import BeforeLoopCallback
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from mflux.error.exceptions import StopImageGenerationException
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PMSET_AC_POWER_STATUS = "Now drawing from 'AC Power'"
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PMSET_BATT_STATUS_PATTERN = r"InternalBattery-.+?(\d+)%"
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logger = logging.getLogger(__name__)
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def _get_machine_model() -> str:
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"""Get the Mac machine model using system_profiler."""
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try:
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result = subprocess.run(
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["system_profiler", "-json", "SPHardwareDataType"], capture_output=True, text=True, check=True
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)
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data = json.loads(result.stdout)
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return data["SPHardwareDataType"][0]["machine_model"]
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except (subprocess.CalledProcessError, json.JSONDecodeError, IndexError, KeyError) as e:
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logger.warning(f"Cannot determine machine model via 'system_profiler -json SPHardwareDataType': {e}")
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return "Unknown"
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MACHINE_MODEL = _get_machine_model()
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# assumption: all Apple Silicon models powered by battery are "MacBook"s
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MACHINE_IS_BATTERY_POWERED = "MacBook" in MACHINE_MODEL
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def get_battery_percentage() -> int | None:
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"""Get the current battery percentage of a battery-powered Mac.
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Returns None if Mac is not a battery-powered machine."""
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if not MACHINE_IS_BATTERY_POWERED:
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return None
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percentage = None
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try:
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# running the subprocess would be expensive in a tight loop
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# but in mflux use case, we would call this only once every
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# few minutes due to N-minutes-long generation times
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result = subprocess.run(["pmset", "-g", "batt"], capture_output=True, text=True, check=True)
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if PMSET_AC_POWER_STATUS not in result.stdout:
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if match := re.search(PMSET_BATT_STATUS_PATTERN, result.stdout):
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percentage = int(match.group(1))
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except (subprocess.CalledProcessError, TypeError) as e:
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logger.warning(
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f"Cannot read battery percentage via 'pmset -g batt': {e}. Battery saver functionality is disabled and the program will continue running."
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)
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return percentage
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class BatterySaver(BeforeLoopCallback):
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def __init__(self, battery_percentage_stop_limit=10):
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self.limit = battery_percentage_stop_limit
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def call_before_loop(self, **kwargs) -> None: # type: ignore
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current_pct: int | None = get_battery_percentage()
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if current_pct is not None and current_pct <= self.limit:
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raise StopImageGenerationException(f"Battery below {self.limit}% threshold: {current_pct}%")
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