56 lines
1.5 KiB
Python
56 lines
1.5 KiB
Python
"""Shared geolocation singleton.
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Runs backend/geolocate.py (IP geolocation, cached) exactly once and notifies
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subscribers. Both the Location map and the Weather widget subscribe, so there is a
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single source of truth for "where am I" and only one network lookup.
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"""
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from __future__ import annotations
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import sys
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from typing import Callable, Optional
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from lib.proc import run_json
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from paths import BACKEND_DIR
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class LocationService:
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def __init__(self) -> None:
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self.data: Optional[dict] = None
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self._subs: list[Callable[[dict], None]] = []
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self._inflight = False
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def subscribe(self, cb: Callable[[dict], None]) -> None:
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self._subs.append(cb)
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if self.data is not None:
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cb(self.data)
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def get(self) -> Optional[dict]:
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if self.data is None and not self._inflight:
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self.refresh()
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return self.data
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def refresh(self) -> None:
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if self._inflight:
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return
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self._inflight = True
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argv = [sys.executable, str(BACKEND_DIR / "geolocate.py")]
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run_json(argv, self._on_result)
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def _on_result(self, ok: bool, data) -> None:
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self._inflight = False
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if ok and isinstance(data, dict) and "lat" in data:
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self.data = data
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for cb in list(self._subs):
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cb(data)
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_instance: LocationService | None = None
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def get_location_service() -> LocationService:
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global _instance
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if _instance is None:
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_instance = LocationService()
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return _instance
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