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132 lines
4.5 KiB
Python
132 lines
4.5 KiB
Python
import asyncio
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import uuid
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from datetime import datetime, timezone
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from typing import Optional, Callable, Awaitable
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from app.internal.op25_client import op25_client
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from app.internal.logger import logger
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CallbackFn = Callable[[dict], Awaitable[None]]
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HANG_THRESHOLD = 2 # polls before declaring a call ended (0.5s poll → 1s hang time)
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POLL_INTERVAL = 0.5 # seconds
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class MetadataWatcher:
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def __init__(self):
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self._running = False
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self._current_tgid: Optional[int] = None
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self._current_tgid_name: Optional[str] = None
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self._hang_counter: int = 0
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self._active_call_id: Optional[str] = None
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self._call_started_at: Optional[datetime] = None
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# Set these before calling start()
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self.on_call_start: Optional[CallbackFn] = None
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self.on_call_end: Optional[CallbackFn] = None
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async def start(self):
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self._running = True
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asyncio.create_task(self._poll_loop())
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logger.info("Metadata watcher started.")
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async def stop(self):
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self._running = False
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if self._active_call_id:
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await self._end_call()
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async def _poll_loop(self):
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while self._running:
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try:
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await self._tick()
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except Exception as e:
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logger.warning(f"Metadata poll error: {e}")
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await asyncio.sleep(POLL_INTERVAL)
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async def _tick(self):
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status = await op25_client.get_terminal_status()
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if not status:
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# OP25 not responding — hang-out any active call
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if self._active_call_id:
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self._hang_counter += 1
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if self._hang_counter >= HANG_THRESHOLD:
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await self._end_call()
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return
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# OP25 terminal returns either a list of channels or a single dict
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channels = status if isinstance(status, list) else [status]
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active_tgid: Optional[int] = None
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active_meta: dict = {}
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for ch in channels:
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tgid = ch.get("tgid") or ch.get("tg_id")
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if tgid and str(tgid) not in ("0", "", "None"):
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active_tgid = int(tgid)
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active_meta = ch
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break
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if active_tgid:
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self._hang_counter = 0
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if self._current_tgid != active_tgid:
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# Talkgroup changed — close previous call and open a new one
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if self._active_call_id:
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await self._end_call()
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self._current_tgid = active_tgid
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await self._start_call(active_tgid, active_meta)
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else:
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# No active talkgroup
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if self._active_call_id:
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self._hang_counter += 1
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if self._hang_counter >= HANG_THRESHOLD:
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await self._end_call()
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async def _start_call(self, tgid: int, meta: dict):
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self._active_call_id = str(uuid.uuid4())
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self._call_started_at = datetime.now(timezone.utc)
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self._current_tgid_name = meta.get("tag") or meta.get("tgid_tag") or ""
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payload = {
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"call_id": self._active_call_id,
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"tgid": tgid,
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"tgid_name": self._current_tgid_name,
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"freq": meta.get("freq"),
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"srcaddr": meta.get("srcaddr"),
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"started_at": self._call_started_at.isoformat(),
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}
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logger.info(f"Call start: tgid={tgid} id={self._active_call_id}")
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if self.on_call_start:
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await self.on_call_start(payload)
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async def _end_call(self):
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if not self._active_call_id:
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return
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payload = {
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"call_id": self._active_call_id,
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"tgid": self._current_tgid,
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"tgid_name": self._current_tgid_name or "",
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"started_at": self._call_started_at.isoformat() if self._call_started_at else None,
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"ended_at": datetime.now(timezone.utc).isoformat(),
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}
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logger.info(f"Call end: id={self._active_call_id}")
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self._active_call_id = None
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self._current_tgid = None
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self._current_tgid_name = None
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self._hang_counter = 0
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self._call_started_at = None
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if self.on_call_end:
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await self.on_call_end(payload)
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@property
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def active_call_id(self) -> Optional[str]:
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return self._active_call_id
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@property
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def current_tgid(self) -> Optional[int]:
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return self._current_tgid
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@property
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def is_active(self) -> bool:
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return self._active_call_id is not None
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metadata_watcher = MetadataWatcher()
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