mirror of
https://github.com/jkingsman/Remote-Terminal-for-MeshCore.git
synced 2026-03-28 17:43:05 +01:00
404 lines
14 KiB
Python
404 lines
14 KiB
Python
import asyncio
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import glob
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import logging
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import platform
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from contextlib import asynccontextmanager, nullcontext
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from pathlib import Path
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from meshcore import MeshCore
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from app.config import settings
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logger = logging.getLogger(__name__)
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class RadioOperationError(RuntimeError):
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"""Base class for shared radio operation lock errors."""
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class RadioOperationBusyError(RadioOperationError):
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"""Raised when a non-blocking radio operation cannot acquire the lock."""
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class RadioDisconnectedError(RadioOperationError):
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"""Raised when the radio disconnects between pre-check and lock acquisition."""
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def detect_serial_devices() -> list[str]:
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"""Detect available serial devices based on platform."""
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devices: list[str] = []
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system = platform.system()
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if system == "Darwin":
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# macOS: Use /dev/cu.* devices (callout devices, preferred over tty.*)
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patterns = [
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"/dev/cu.usb*",
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"/dev/cu.wchusbserial*",
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"/dev/cu.SLAB_USBtoUART*",
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]
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for pattern in patterns:
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devices.extend(glob.glob(pattern))
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devices.sort()
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else:
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# Linux: Prefer /dev/serial/by-id/ for persistent naming
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by_id_path = Path("/dev/serial/by-id")
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if by_id_path.is_dir():
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devices.extend(str(p) for p in by_id_path.iterdir())
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# Also check /dev/ttyACM* and /dev/ttyUSB* as fallback
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resolved_paths = set()
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for dev in devices:
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try:
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resolved_paths.add(str(Path(dev).resolve()))
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except OSError:
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pass
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for pattern in ["/dev/ttyACM*", "/dev/ttyUSB*"]:
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for dev in glob.glob(pattern):
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try:
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if str(Path(dev).resolve()) not in resolved_paths:
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devices.append(dev)
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except OSError:
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devices.append(dev)
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devices.sort()
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return devices
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async def test_serial_device(port: str, baudrate: int, timeout: float = 3.0) -> bool:
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"""Test if a MeshCore radio responds on the given serial port."""
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mc = None
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try:
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logger.debug("Testing serial device %s", port)
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mc = await asyncio.wait_for(
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MeshCore.create_serial(port=port, baudrate=baudrate),
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timeout=timeout,
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)
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# Check if we got valid self_info (indicates successful communication)
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if mc.is_connected and mc.self_info:
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logger.debug("Device %s responded with valid self_info", port)
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return True
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return False
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except asyncio.TimeoutError:
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logger.debug("Device %s timed out", port)
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return False
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except Exception as e:
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logger.debug("Device %s failed: %s", port, e)
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return False
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finally:
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if mc is not None:
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try:
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await mc.disconnect()
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except Exception:
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pass
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async def find_radio_port(baudrate: int) -> str | None:
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"""Find the first serial port with a responding MeshCore radio."""
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devices = detect_serial_devices()
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if not devices:
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logger.warning("No serial devices found")
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return None
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logger.info("Found %d serial device(s), testing for MeshCore radio...", len(devices))
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for device in devices:
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if await test_serial_device(device, baudrate):
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logger.info("Found MeshCore radio at %s", device)
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return device
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logger.warning("No MeshCore radio found on any serial device")
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return None
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class RadioManager:
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"""Manages the MeshCore radio connection."""
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def __init__(self):
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self._meshcore: MeshCore | None = None
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self._connection_info: str | None = None
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self._reconnect_task: asyncio.Task | None = None
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self._last_connected: bool = False
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self._reconnect_lock: asyncio.Lock | None = None
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self._operation_lock: asyncio.Lock | None = None
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self._setup_lock: asyncio.Lock | None = None
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self._setup_in_progress: bool = False
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self._setup_complete: bool = False
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self.path_hash_mode: int = 0
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self.path_hash_mode_supported: bool = False
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async def _acquire_operation_lock(
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self,
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name: str,
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*,
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blocking: bool,
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) -> None:
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"""Acquire the shared radio operation lock."""
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if self._operation_lock is None:
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self._operation_lock = asyncio.Lock()
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if not blocking:
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if self._operation_lock.locked():
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raise RadioOperationBusyError(f"Radio is busy (operation: {name})")
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await self._operation_lock.acquire()
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else:
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await self._operation_lock.acquire()
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logger.debug("Acquired radio operation lock (%s)", name)
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def _release_operation_lock(self, name: str) -> None:
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"""Release the shared radio operation lock."""
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if self._operation_lock and self._operation_lock.locked():
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self._operation_lock.release()
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logger.debug("Released radio operation lock (%s)", name)
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else:
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logger.error("Attempted to release unlocked radio operation lock (%s)", name)
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@asynccontextmanager
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async def radio_operation(
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self,
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name: str,
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*,
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pause_polling: bool = False,
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suspend_auto_fetch: bool = False,
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blocking: bool = True,
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):
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"""Acquire shared radio lock and optionally pause polling / auto-fetch.
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After acquiring the lock, resolves the current MeshCore instance and
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yields it. Callers get a fresh reference via ``async with ... as mc:``,
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avoiding stale-reference bugs when a reconnect swaps ``_meshcore``
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between the pre-check and the lock acquisition.
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Args:
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name: Human-readable operation name for logs/errors.
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pause_polling: Pause fallback message polling while held.
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suspend_auto_fetch: Stop MeshCore auto message fetching while held.
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blocking: If False, fail immediately when lock is held.
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Raises:
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RadioDisconnectedError: If the radio disconnected before the lock
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was acquired (``_meshcore`` is ``None``).
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"""
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await self._acquire_operation_lock(name, blocking=blocking)
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mc = self._meshcore
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if mc is None:
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self._release_operation_lock(name)
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raise RadioDisconnectedError("Radio disconnected")
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poll_context = nullcontext()
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if pause_polling:
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from app.radio_sync import pause_polling as pause_polling_context
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poll_context = pause_polling_context()
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auto_fetch_paused = False
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try:
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async with poll_context:
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if suspend_auto_fetch:
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await mc.stop_auto_message_fetching()
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auto_fetch_paused = True
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yield mc
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finally:
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try:
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if auto_fetch_paused:
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try:
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await mc.start_auto_message_fetching()
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except Exception as e:
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logger.warning("Failed to restart auto message fetching (%s): %s", name, e)
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finally:
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self._release_operation_lock(name)
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async def post_connect_setup(self) -> None:
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"""Run shared post-connection orchestration after transport setup succeeds."""
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from app.services.radio_lifecycle import run_post_connect_setup
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await run_post_connect_setup(self)
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@property
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def meshcore(self) -> MeshCore | None:
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return self._meshcore
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@property
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def connection_info(self) -> str | None:
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return self._connection_info
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@property
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def is_connected(self) -> bool:
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return self._meshcore is not None and self._meshcore.is_connected
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@property
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def is_reconnecting(self) -> bool:
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return self._reconnect_lock is not None and self._reconnect_lock.locked()
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@property
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def is_setup_in_progress(self) -> bool:
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return self._setup_in_progress
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@property
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def is_setup_complete(self) -> bool:
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return self._setup_complete
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async def connect(self) -> None:
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"""Connect to the radio using the configured transport."""
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if self._meshcore is not None:
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await self.disconnect()
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connection_type = settings.connection_type
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if connection_type == "tcp":
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await self._connect_tcp()
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elif connection_type == "ble":
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await self._connect_ble()
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else:
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await self._connect_serial()
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async def _connect_serial(self) -> None:
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"""Connect to the radio over serial."""
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port = settings.serial_port
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# Auto-detect if no port specified
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if not port:
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logger.info("No serial port specified, auto-detecting...")
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port = await find_radio_port(settings.serial_baudrate)
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if not port:
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raise RuntimeError("No MeshCore radio found. Please specify MESHCORE_SERIAL_PORT.")
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logger.debug(
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"Connecting to radio at %s (baud %d)",
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port,
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settings.serial_baudrate,
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)
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self._meshcore = await MeshCore.create_serial(
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port=port,
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baudrate=settings.serial_baudrate,
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auto_reconnect=True,
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max_reconnect_attempts=10,
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)
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self._connection_info = f"Serial: {port}"
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self._last_connected = True
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self._setup_complete = False
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logger.debug("Serial connection established")
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async def _connect_tcp(self) -> None:
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"""Connect to the radio over TCP."""
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host = settings.tcp_host
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port = settings.tcp_port
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logger.debug("Connecting to radio at %s:%d (TCP)", host, port)
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self._meshcore = await MeshCore.create_tcp(
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host=host,
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port=port,
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auto_reconnect=True,
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max_reconnect_attempts=10,
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)
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self._connection_info = f"TCP: {host}:{port}"
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self._last_connected = True
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self._setup_complete = False
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logger.debug("TCP connection established")
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async def _connect_ble(self) -> None:
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"""Connect to the radio over BLE."""
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address = settings.ble_address
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pin = settings.ble_pin
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logger.debug("Connecting to radio at %s (BLE)", address)
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self._meshcore = await MeshCore.create_ble(
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address=address,
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pin=pin,
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auto_reconnect=True,
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max_reconnect_attempts=15,
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)
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self._connection_info = f"BLE: {address}"
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self._last_connected = True
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self._setup_complete = False
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logger.debug("BLE connection established")
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async def disconnect(self) -> None:
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"""Disconnect from the radio."""
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if self._meshcore is not None:
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logger.debug("Disconnecting from radio")
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await self._meshcore.disconnect()
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self._meshcore = None
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self._setup_complete = False
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self.path_hash_mode = 0
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self.path_hash_mode_supported = False
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logger.debug("Radio disconnected")
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async def reconnect(self, *, broadcast_on_success: bool = True) -> bool:
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"""Attempt to reconnect to the radio.
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Returns True if reconnection was successful, False otherwise.
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Uses a lock to prevent concurrent reconnection attempts.
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"""
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from app.websocket import broadcast_error, broadcast_health
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# Lazily initialize lock (can't create in __init__ before event loop exists)
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if self._reconnect_lock is None:
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self._reconnect_lock = asyncio.Lock()
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async with self._reconnect_lock:
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# If we became connected while waiting for the lock (another
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# reconnect succeeded ahead of us), skip the redundant attempt.
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if self.is_connected:
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logger.debug("Already connected after acquiring lock, skipping reconnect")
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return True
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logger.info("Attempting to reconnect to radio...")
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try:
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# Disconnect if we have a stale connection
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if self._meshcore is not None:
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try:
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await self._meshcore.disconnect()
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except Exception:
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pass
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self._meshcore = None
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# Try to connect (will auto-detect if no port specified)
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await self.connect()
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if self.is_connected:
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logger.info("Radio reconnected successfully at %s", self._connection_info)
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if broadcast_on_success:
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broadcast_health(True, self._connection_info)
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return True
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else:
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logger.warning("Reconnection failed: not connected after connect()")
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return False
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except Exception as e:
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logger.warning("Reconnection failed: %s", e, exc_info=True)
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broadcast_error("Reconnection failed", str(e))
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return False
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async def start_connection_monitor(self) -> None:
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"""Start background task to monitor connection and auto-reconnect."""
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from app.services.radio_lifecycle import connection_monitor_loop
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if self._reconnect_task is not None:
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return
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self._reconnect_task = asyncio.create_task(connection_monitor_loop(self))
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logger.info("Radio connection monitor started")
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async def stop_connection_monitor(self) -> None:
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"""Stop the connection monitor task."""
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if self._reconnect_task is not None:
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self._reconnect_task.cancel()
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try:
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await self._reconnect_task
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except asyncio.CancelledError:
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pass
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self._reconnect_task = None
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logger.info("Radio connection monitor stopped")
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radio_manager = RadioManager()
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