Lago
314 lines
13 KiB
Python
314 lines
13 KiB
Python
from __future__ import annotations
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from dataclasses import dataclass, field
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from datetime import UTC, datetime
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from threading import Event, Lock, Thread
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from typing import Any
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from app.config import (
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AppConfig,
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ConfigStore,
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SUPPORTED_TARGET_PORTS,
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)
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from app.ddm import DDMBackend, RealDDMBackend
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from app.hardware import HardwareScan, MonitorBackend, RealMonitorBackend
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@dataclass(slots=True)
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class ServiceStatus:
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config: AppConfig = field(default_factory=AppConfig)
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samsung_present: bool = False
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samsung_connected_session_active: bool = False
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samsung_session_attempted: bool = False
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samsung_session_successful: bool = False
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samsung_session_attempt_count: int = 0
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waiting_for_samsung_disconnect: bool = False
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trigger_input_code: int | None = None
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trigger_target_port: str | None = None
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trigger_matches_device_port: bool = False
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alienware_detected: bool = False
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alienware_input_code: int | None = None
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ddm_slot: int | None = None
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ddm_ready: bool = False
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last_switch_result: str = "idle"
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last_switch_at: str | None = None
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errors: list[str] = field(default_factory=list)
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def to_dict(self) -> dict[str, Any]:
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return {
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"config": self.config.to_dict(),
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"samsung_present": self.samsung_present,
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"samsung_connected_session_active": self.samsung_connected_session_active,
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"samsung_session_attempted": self.samsung_session_attempted,
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"samsung_session_successful": self.samsung_session_successful,
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"samsung_session_attempt_count": self.samsung_session_attempt_count,
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"waiting_for_samsung_disconnect": self.waiting_for_samsung_disconnect,
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"trigger_input_code": self.trigger_input_code,
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"trigger_target_port": self.trigger_target_port,
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"trigger_matches_device_port": self.trigger_matches_device_port,
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"alienware_detected": self.alienware_detected,
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"alienware_input_code": self.alienware_input_code,
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"ddm_slot": self.ddm_slot,
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"ddm_ready": self.ddm_ready,
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"last_switch_result": self.last_switch_result,
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"last_switch_at": self.last_switch_at,
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"errors": list(self.errors),
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}
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class KvmSwitcherService:
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def __init__(
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self,
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config_store: ConfigStore | None = None,
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monitor_backend: MonitorBackend | None = None,
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ddm_backend: DDMBackend | None = None,
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poll_interval_seconds: float = 0.25,
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retry_wait_seconds: float = 5.0,
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):
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self.config_store = config_store or ConfigStore()
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self.monitor_backend = monitor_backend or RealMonitorBackend()
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self.ddm_backend = ddm_backend or RealDDMBackend()
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self.poll_interval_seconds = poll_interval_seconds
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self.retry_wait_seconds = retry_wait_seconds
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self._status = ServiceStatus(config=self.config_store.get())
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self._samsung_session_active = False
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self._samsung_session_attempted = False
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self._samsung_session_successful = False
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self._samsung_session_attempt_count = 0
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self._state_lock = Lock()
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self._stop_event = Event()
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self._thread: Thread | None = None
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def start(self) -> None:
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with self._state_lock:
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if self._thread and self._thread.is_alive():
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return
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self._stop_event.clear()
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self._thread = Thread(target=self._run_loop, name="kvm-switch-poller", daemon=True)
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self._thread.start()
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def stop(self) -> None:
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self._stop_event.set()
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with self._state_lock:
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thread = self._thread
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self._thread = None
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if thread and thread.is_alive():
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thread.join(timeout=2.0)
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def get_status(self) -> dict[str, Any]:
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with self._state_lock:
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return self._status.to_dict()
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def save_settings(self, device_port: str) -> dict[str, Any]:
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new_config = AppConfig(device_port=device_port)
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self.config_store.save(new_config)
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return self.poll_once()
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def poll_once(self) -> dict[str, Any]:
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config = self.config_store.get()
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scan = self.monitor_backend.scan()
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self._update_samsung_session(scan.samsung_present)
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errors = list(scan.errors)
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errors.extend(config.validate())
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blocking_errors = [error for error in errors if _is_blocking_error(error)]
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ddm_slot = self.ddm_backend.resolve_alienware_slot(force=False)
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supports_monitor_targeting = bool(
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getattr(self.ddm_backend, "supports_monitor_targeting", lambda: False)()
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)
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ddm_ready = self.ddm_backend.is_available() and (
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ddm_slot is not None or supports_monitor_targeting
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)
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if not self.ddm_backend.is_available():
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errors.append("DDM.exe was not found.")
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elif ddm_slot is None and not supports_monitor_targeting:
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errors.append("Alienware DDM slot could not be resolved.")
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trigger_target_port = self._port_name_for_input_code(scan.trigger_input_code)
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desired_port = self._resolve_desired_port(config, scan)
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trigger_matches_device_port = desired_port is not None
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last_switch_result = "idle"
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with self._state_lock:
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last_switch_at = self._status.last_switch_at
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should_attempt_switch = (
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not blocking_errors
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and desired_port is not None
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and ddm_ready
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and scan.samsung_present
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and not self._samsung_session_successful
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and self._samsung_session_attempt_count < 3
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)
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if should_attempt_switch:
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desired_codes = self._port_input_codes(desired_port)
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if scan.alienware_input_code is not None and scan.alienware_input_code in desired_codes:
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last_switch_result = "noop"
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self._samsung_session_attempted = True
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self._samsung_session_successful = True
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else:
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last_switch_result, last_switch_at, scan, errors = self._attempt_switch_sequence(
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ddm_slot=ddm_slot,
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desired_port=desired_port,
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scan=scan,
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last_switch_at=last_switch_at,
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errors=errors,
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)
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elif trigger_matches_device_port and self._samsung_session_successful:
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last_switch_result = "waiting_for_disconnect"
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elif trigger_matches_device_port and self._samsung_session_attempt_count >= 3:
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last_switch_result = "max_attempts_waiting_for_disconnect"
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elif scan.samsung_present:
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last_switch_result = "waiting_for_trigger_match"
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status = ServiceStatus(
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config=config,
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samsung_present=scan.samsung_present,
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samsung_connected_session_active=self._samsung_session_active,
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samsung_session_attempted=self._samsung_session_attempted,
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samsung_session_successful=self._samsung_session_successful,
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samsung_session_attempt_count=self._samsung_session_attempt_count,
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waiting_for_samsung_disconnect=self._samsung_session_successful or self._samsung_session_attempt_count >= 3,
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trigger_input_code=scan.trigger_input_code,
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trigger_target_port=trigger_target_port,
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trigger_matches_device_port=trigger_matches_device_port,
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alienware_detected=scan.alienware_detected,
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alienware_input_code=scan.alienware_input_code,
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ddm_slot=ddm_slot,
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ddm_ready=ddm_ready,
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last_switch_result=last_switch_result,
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last_switch_at=last_switch_at,
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errors=_dedupe_errors(errors),
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)
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with self._state_lock:
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self._status = status
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return self._status.to_dict()
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def _run_loop(self) -> None:
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while not self._stop_event.is_set():
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try:
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self.poll_once()
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except Exception as exc:
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with self._state_lock:
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errors = list(self._status.errors)
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errors.append(f"Unhandled polling error: {exc}")
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self._status.errors = _dedupe_errors(errors)
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self._status.last_switch_result = "error"
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self._stop_event.wait(self.poll_interval_seconds)
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@staticmethod
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def _resolve_desired_port(
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config: AppConfig,
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scan: HardwareScan,
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) -> str | None:
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trigger_input = scan.trigger_input_code
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if trigger_input is None:
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return None
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desired_codes = KvmSwitcherService._port_input_codes(config.device_port)
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if trigger_input in desired_codes:
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return config.device_port
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return None
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@staticmethod
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def _port_input_codes(port_name: str) -> set[int]:
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port_spec = SUPPORTED_TARGET_PORTS.get(port_name.upper(), {})
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raw_codes = port_spec.get("input_codes", set())
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return {int(code) for code in raw_codes}
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@staticmethod
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def _port_name_for_input_code(input_code: int | None) -> str | None:
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if input_code is None:
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return None
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for port_name in SUPPORTED_TARGET_PORTS:
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port_codes = KvmSwitcherService._port_input_codes(port_name)
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if input_code in port_codes:
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return port_name
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return None
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def _update_samsung_session(self, samsung_present: bool) -> None:
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if samsung_present:
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if not self._samsung_session_active:
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self._samsung_session_active = True
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self._samsung_session_attempted = False
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self._samsung_session_successful = False
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self._samsung_session_attempt_count = 0
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else:
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self._samsung_session_active = False
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self._samsung_session_attempted = False
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self._samsung_session_successful = False
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self._samsung_session_attempt_count = 0
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def _attempt_switch_sequence(
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self,
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ddm_slot: int | None,
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desired_port: str,
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scan: HardwareScan,
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last_switch_at: str | None,
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errors: list[str],
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) -> tuple[str, str | None, HardwareScan, list[str]]:
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last_result = "blocked"
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while self._samsung_session_attempt_count < 3:
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self._samsung_session_attempted = True
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self._samsung_session_attempt_count += 1
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switch_slot = ddm_slot if ddm_slot is not None else 0
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result = self.ddm_backend.switch_to_port(switch_slot, desired_port)
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if not result.success:
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errors.append(result.message)
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self.ddm_backend.invalidate_slot()
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return "error", last_switch_at, scan, errors
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last_switch_at = datetime.now(UTC).isoformat()
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last_result = "switched"
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self._stop_event.wait(self.retry_wait_seconds)
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verify_scan = self.monitor_backend.scan()
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scan = verify_scan
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errors.extend(verify_scan.errors)
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self._update_samsung_session(verify_scan.samsung_present)
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if not verify_scan.samsung_present:
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return "waiting_for_reconnect", last_switch_at, scan, errors
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desired_codes = self._port_input_codes(desired_port)
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if verify_scan.trigger_input_code not in desired_codes:
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return "waiting_for_trigger_match", last_switch_at, scan, errors
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if verify_scan.alienware_input_code is None:
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errors.append(
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"Alienware input could not be read after switch; assuming success because DDM command completed."
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)
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self._samsung_session_successful = True
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return "switched_unverified", last_switch_at, scan, errors
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if verify_scan.alienware_input_code in desired_codes:
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self._samsung_session_successful = True
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return last_result, last_switch_at, scan, errors
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return "max_attempts_waiting_for_disconnect", last_switch_at, scan, errors
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def _dedupe_errors(errors: list[str]) -> list[str]:
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unique: list[str] = []
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seen: set[str] = set()
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for error in errors:
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normalized = error.strip()
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if not normalized or normalized in seen:
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continue
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seen.add(normalized)
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unique.append(normalized)
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return unique
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def _is_blocking_error(error: str) -> bool:
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normalized = error.strip()
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non_blocking_prefixes = (
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"Unable to read Alienware target monitor input source:",
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"Alienware input could not be read after switch; assuming success because DDM command completed.",
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"Samsung trigger monitor did not expose a Samsung model in DDC/CI; using the only non-Alienware DDC monitor as trigger.",
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)
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return not any(normalized.startswith(prefix) for prefix in non_blocking_prefixes)
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