131 lines
5.2 KiB
Python
131 lines
5.2 KiB
Python
import asyncio
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from asyncua import Client
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from sientia_do.notifications.handlers import CoreNotificationHandler as NotificationHandler
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from sientia_do.observability.logger import Logger
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from sientia_do.observability.metrics_controller import MetricsController
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from sientia_do.observability.sientia_monitoring import SientiaMonitoring
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import ingestor.metrics as metrics
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from ingestor.connection.certs import CertProvider
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from ingestor.connection.clock import MonotonicClock
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from ingestor.connection.security import apply_security
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class OpcConnectionPool(SientiaMonitoring):
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"""Per-server OPC UA client cache (F0 capstone): reuses live connections,
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evicts idle ones, and reconnects after a failed attempt (never caches it)."""
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def __init__(
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self,
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cert_provider: CertProvider,
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logger: Logger,
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notification_handler: NotificationHandler,
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metrics_controller: MetricsController,
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):
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self.cert_provider = cert_provider
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self.clock = MonotonicClock()
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self._connections: dict[str, tuple[Client, float]] = {}
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# ponytail: one Lock per server_id, never cleaned up — server set is
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# small and bounded. Add eviction of stale locks only if it grows.
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self._locks: dict[str, asyncio.Lock] = {}
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SientiaMonitoring.__init__(
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self,
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logger=logger,
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notification_handler=notification_handler,
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metrics_controller=metrics_controller,
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)
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async def get(self, server_id: str, server_cfg: dict) -> Client:
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"""Return the cached client for `server_id`, connecting one if needed.
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Double-checked under a per-server lock so concurrent callers for the
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same new server share one connection (no leaked, untracked sessions)."""
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client = self._cached(server_id)
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if client is not None:
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return client
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async with self._locks.setdefault(server_id, asyncio.Lock()):
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client = self._cached(server_id) # re-check: a racer may have connected
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if client is not None:
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return client
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return await self._open(server_id, server_cfg)
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def _cached(self, server_id: str) -> Client | None:
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entry = self._connections.get(server_id)
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if entry is None:
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return None
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client, _ = entry
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self._connections[server_id] = (client, self.clock.elapsed())
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return client
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async def _open(self, server_id: str, server_cfg: dict) -> Client:
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try:
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client = await self._connect(server_cfg)
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except Exception:
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await self.emit_metric(
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metric_object=metrics.OPC_CONNECTIONS_FAILED,
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tags={'pod_id': self.pod_id, 'server_name': server_id},
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)
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raise
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self._connections[server_id] = (client, self.clock.elapsed())
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await self._record_connected(server_id, server_cfg['url'])
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return client
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async def _connect(self, server_cfg: dict) -> Client:
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client = Client(server_cfg['url'], timeout=10)
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client.application_uri = server_cfg.get('server_uri')
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if server_cfg.get('use_security'):
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cert, key = await self.cert_provider.fetch()
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await apply_security(client, server_cfg.get('server_uri'), cert, key, None)
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await client.connect()
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return client
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async def _record_connected(self, server_id: str, url: str):
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await self.emit_metric(
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metric_object=metrics.OPC_CONNECTIONS_TOTAL,
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tags={'pod_id': self.pod_id, 'server_name': server_id},
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)
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await self.emit_metric(
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metric_object=metrics.OPC_CONNECTION_STATUS,
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method='set',
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value=1,
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tags={'pod_id': self.pod_id, 'server_name': server_id, 'server_url': url},
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)
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async def release_idle(self, max_idle_s: float):
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"""Disconnect and drop clients unused for longer than `max_idle_s`."""
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now = self.clock.elapsed()
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idle_ids = [
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sid for sid, (_, last_used) in self._connections.items() if now - last_used > max_idle_s
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]
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for server_id in idle_ids:
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await self._evict(server_id)
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async def close_all(self):
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"""Disconnect every pooled client (e.g. on shutdown)."""
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for server_id in list(self._connections):
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await self._evict(server_id)
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async def _evict(self, server_id: str):
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client, _ = self._connections.pop(server_id)
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await self._disconnect_with_retries(client, server_id)
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await self.emit_metric(
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metric_object=metrics.OPC_DISCONNECTIONS_TOTAL,
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tags={'pod_id': self.pod_id, 'server_name': server_id},
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)
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async def _disconnect_with_retries(self, client: Client, server_id: str) -> None:
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"""Tries 5 times to disconnect, with a delay of 100ms x try (mirrors
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OpcManager.disconnection_fallback)."""
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for i in range(5):
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try:
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await client.disconnect()
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return
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except Exception as e:
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self.logger.error(
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f'Failed to disconnect from {server_id}, attempt {i + 1} of 5: {e}'
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)
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await asyncio.sleep(0.1 * i)
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