mirror of
https://github.com/zvx-echo6/central.git
synced 2026-05-21 18:14:44 +02:00
feat(supervisor): add hot-reload support with rate-limit guarantee
Refactors supervisor to use ConfigSource abstraction: - AdapterState tracks last_completed_poll for rate limiting - Hot-reload via NOTIFY: cadence/enable/disable changes take effect - Rate-limit guarantee: next poll at last_poll + new_cadence, not now - Logs config source at startup (toml or db) - Logs reschedule decisions with next poll timestamp Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Ubuntu
parent
ee593abc54
commit
29fa49c5c2
1 changed files with 539 additions and 255 deletions
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@ -1,255 +1,539 @@
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"""Central supervisor - adapter scheduler and event publisher."""
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import asyncio
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import json
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import logging
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import signal
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import sys
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from datetime import datetime, timezone
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from pathlib import Path
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from typing import Any
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import nats
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from nats.js import JetStreamContext
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from central.adapters.nws import NWSAdapter
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from central.cloudevents_wire import wrap_event
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from central.config import load_config, Config
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from central.models import subject_for_event
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CURSOR_DB_PATH = Path("/var/lib/central/cursors.db")
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CONFIG_PATH = "/etc/central/central.toml"
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class JsonFormatter(logging.Formatter):
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"""JSON log formatter for structured logging."""
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def format(self, record: logging.LogRecord) -> str:
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log_obj: dict[str, Any] = {
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"ts": datetime.now(timezone.utc).isoformat(),
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"level": record.levelname,
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"logger": record.name,
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"msg": record.getMessage(),
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}
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if record.exc_info:
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log_obj["exc"] = self.formatException(record.exc_info)
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if hasattr(record, "extra"):
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log_obj.update(record.extra)
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# Include any extra fields passed via extra={}
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for key in record.__dict__:
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if key not in (
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"name", "msg", "args", "created", "filename", "funcName",
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"levelname", "levelno", "lineno", "module", "msecs",
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"pathname", "process", "processName", "relativeCreated",
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"stack_info", "exc_info", "exc_text", "thread", "threadName",
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"taskName", "message",
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):
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log_obj[key] = record.__dict__[key]
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return json.dumps(log_obj)
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def setup_logging() -> None:
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"""Configure JSON logging to stdout."""
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handler = logging.StreamHandler(sys.stdout)
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handler.setFormatter(JsonFormatter())
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logging.root.handlers = [handler]
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logging.root.setLevel(logging.INFO)
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logger = logging.getLogger("central.supervisor")
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class Supervisor:
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"""Main supervisor process."""
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def __init__(self, config: Config) -> None:
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self.config = config
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self._nc: nats.NATS | None = None
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self._js: JetStreamContext | None = None
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self._adapters: list[NWSAdapter] = []
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self._tasks: list[asyncio.Task[None]] = []
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self._shutdown_event = asyncio.Event()
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self._start_time = datetime.now(timezone.utc)
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async def connect(self) -> None:
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"""Connect to NATS."""
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self._nc = await nats.connect(self.config.nats.url)
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self._js = self._nc.jetstream()
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logger.info("Connected to NATS", extra={"url": self.config.nats.url})
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async def disconnect(self) -> None:
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"""Disconnect from NATS."""
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if self._nc:
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await self._nc.drain()
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await self._nc.close()
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self._nc = None
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self._js = None
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logger.info("Disconnected from NATS")
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async def _publish_meta(self, subject: str, data: dict[str, Any]) -> None:
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"""Publish a meta event (no Nats-Msg-Id)."""
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if not self._nc:
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return
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payload = json.dumps(data).encode()
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await self._nc.publish(subject, payload)
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async def _publish_event(self, subject: str, envelope: dict[str, Any], msg_id: str) -> None:
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"""Publish an event with dedup header."""
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if not self._js:
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return
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payload = json.dumps(envelope).encode()
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await self._js.publish(
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subject,
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payload,
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headers={"Nats-Msg-Id": msg_id},
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)
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async def _run_adapter(self, adapter: NWSAdapter) -> None:
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"""Run an adapter poll loop."""
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while not self._shutdown_event.is_set():
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poll_start = datetime.now(timezone.utc)
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try:
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async for event in adapter.poll():
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# Dedup check
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if adapter.is_published(event.id):
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adapter.bump_last_seen(event.id)
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continue
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# Build CloudEvent
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envelope, msg_id = wrap_event(event, self.config)
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subject = subject_for_event(event)
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# Publish
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await self._publish_event(subject, envelope, msg_id)
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adapter.mark_published(event.id)
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logger.info(
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"Published event",
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extra={"id": event.id, "subject": subject, "category": event.category}
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)
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# Publish success status
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await self._publish_meta(
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f"central.meta.adapter.{adapter.name}.status",
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{"ok": True, "ts": datetime.now(timezone.utc).isoformat()}
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)
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except Exception as e:
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logger.exception("Adapter poll failed", extra={"adapter": adapter.name})
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await self._publish_meta(
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f"central.meta.adapter.{adapter.name}.status",
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{
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"ok": False,
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"error": str(e),
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"ts": datetime.now(timezone.utc).isoformat()
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}
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)
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# Sweep old IDs
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swept = adapter.sweep_old_ids()
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if swept > 0:
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logger.info("Swept old published IDs", extra={"count": swept})
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# Sleep until next cadence
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elapsed = (datetime.now(timezone.utc) - poll_start).total_seconds()
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sleep_time = max(0, adapter.cadence_s - elapsed)
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try:
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await asyncio.wait_for(
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self._shutdown_event.wait(),
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timeout=sleep_time
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)
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except asyncio.TimeoutError:
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pass
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async def _heartbeat_loop(self) -> None:
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"""Publish periodic heartbeats."""
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while not self._shutdown_event.is_set():
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uptime = (datetime.now(timezone.utc) - self._start_time).total_seconds()
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await self._publish_meta(
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"central.meta.heartbeat",
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{"ts": datetime.now(timezone.utc).isoformat(), "uptime_s": uptime}
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)
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try:
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await asyncio.wait_for(
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self._shutdown_event.wait(),
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timeout=30
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)
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except asyncio.TimeoutError:
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pass
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async def start(self) -> None:
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"""Start the supervisor."""
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await self.connect()
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# Initialize adapters
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if self.config.adapters.get("nws") and self.config.adapters["nws"].enabled:
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adapter = NWSAdapter(
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config=self.config.adapters["nws"],
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cursor_db_path=CURSOR_DB_PATH,
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)
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await adapter.startup()
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self._adapters.append(adapter)
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logger.info("NWS adapter initialized")
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# Start adapter tasks
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for adapter in self._adapters:
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task = asyncio.create_task(self._run_adapter(adapter))
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self._tasks.append(task)
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# Start heartbeat
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self._tasks.append(asyncio.create_task(self._heartbeat_loop()))
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logger.info("Supervisor started", extra={"adapters": [a.name for a in self._adapters]})
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async def stop(self) -> None:
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"""Stop the supervisor gracefully."""
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logger.info("Supervisor shutting down")
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self._shutdown_event.set()
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# Cancel tasks
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for task in self._tasks:
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task.cancel()
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try:
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await task
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except asyncio.CancelledError:
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pass
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# Shutdown adapters
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for adapter in self._adapters:
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await adapter.shutdown()
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await self.disconnect()
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logger.info("Supervisor stopped")
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async def async_main() -> None:
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"""Async entry point."""
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setup_logging()
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config = load_config(CONFIG_PATH)
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supervisor = Supervisor(config)
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loop = asyncio.get_running_loop()
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shutdown_event = asyncio.Event()
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def handle_signal() -> None:
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shutdown_event.set()
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for sig in (signal.SIGTERM, signal.SIGINT):
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loop.add_signal_handler(sig, handle_signal)
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await supervisor.start()
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# Wait for shutdown signal
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await shutdown_event.wait()
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await supervisor.stop()
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def main() -> None:
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"""Entry point."""
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asyncio.run(async_main())
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if __name__ == "__main__":
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main()
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"""Central supervisor - adapter scheduler and event publisher."""
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import asyncio
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import json
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import logging
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import signal
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import sys
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from dataclasses import dataclass, field
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from datetime import datetime, timezone
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from pathlib import Path
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from typing import Any
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import nats
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from nats.js import JetStreamContext
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from central.adapters.nws import NWSAdapter
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from central.cloudevents_wire import wrap_event
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from central.config import load_config, Config, NWSAdapterConfig
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from central.config_models import AdapterConfig
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from central.config_source import ConfigSource, create_config_source
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from central.bootstrap_config import get_settings
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from central.models import subject_for_event
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CURSOR_DB_PATH = Path("/var/lib/central/cursors.db")
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class JsonFormatter(logging.Formatter):
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"""JSON log formatter for structured logging."""
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def format(self, record: logging.LogRecord) -> str:
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log_obj: dict[str, Any] = {
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"ts": datetime.now(timezone.utc).isoformat(),
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"level": record.levelname,
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"logger": record.name,
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"msg": record.getMessage(),
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}
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if record.exc_info:
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log_obj["exc"] = self.formatException(record.exc_info)
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if hasattr(record, "extra"):
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log_obj.update(record.extra)
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for key in record.__dict__:
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if key not in (
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"name", "msg", "args", "created", "filename", "funcName",
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"levelname", "levelno", "lineno", "module", "msecs",
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"pathname", "process", "processName", "relativeCreated",
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"stack_info", "exc_info", "exc_text", "thread", "threadName",
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"taskName", "message",
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):
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log_obj[key] = record.__dict__[key]
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return json.dumps(log_obj)
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def setup_logging() -> None:
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"""Configure JSON logging to stdout."""
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handler = logging.StreamHandler(sys.stdout)
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handler.setFormatter(JsonFormatter())
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logging.root.handlers = [handler]
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logging.root.setLevel(logging.INFO)
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logger = logging.getLogger("central.supervisor")
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@dataclass
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class AdapterState:
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"""Runtime state for a scheduled adapter."""
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name: str
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adapter: NWSAdapter
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config: AdapterConfig
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task: asyncio.Task[None] | None = None
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last_completed_poll: datetime | None = None
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cancel_event: asyncio.Event = field(default_factory=asyncio.Event)
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def __post_init__(self) -> None:
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# Ensure cancel_event is created
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if self.cancel_event is None:
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self.cancel_event = asyncio.Event()
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class Supervisor:
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"""Main supervisor process."""
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def __init__(
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self,
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config_source: ConfigSource,
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nats_url: str,
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cloudevents_config: Any = None,
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) -> None:
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self._config_source = config_source
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self._nats_url = nats_url
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self._cloudevents_config = cloudevents_config
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self._nc: nats.NATS | None = None
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self._js: JetStreamContext | None = None
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self._adapter_states: dict[str, AdapterState] = {}
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self._tasks: list[asyncio.Task[None]] = []
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self._shutdown_event = asyncio.Event()
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self._start_time = datetime.now(timezone.utc)
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self._config_watch_task: asyncio.Task[None] | None = None
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self._lock = asyncio.Lock()
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async def connect(self) -> None:
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"""Connect to NATS."""
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self._nc = await nats.connect(self._nats_url)
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self._js = self._nc.jetstream()
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logger.info("Connected to NATS", extra={"url": self._nats_url})
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async def disconnect(self) -> None:
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"""Disconnect from NATS."""
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if self._nc:
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await self._nc.drain()
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await self._nc.close()
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self._nc = None
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self._js = None
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logger.info("Disconnected from NATS")
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async def _publish_meta(self, subject: str, data: dict[str, Any]) -> None:
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"""Publish a meta event (no Nats-Msg-Id)."""
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if not self._nc:
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return
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payload = json.dumps(data).encode()
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await self._nc.publish(subject, payload)
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async def _publish_event(self, subject: str, envelope: dict[str, Any], msg_id: str) -> None:
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"""Publish an event with dedup header."""
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if not self._js:
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return
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payload = json.dumps(envelope).encode()
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await self._js.publish(
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subject,
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payload,
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headers={"Nats-Msg-Id": msg_id},
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)
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def _adapter_config_to_nws_config(self, config: AdapterConfig) -> NWSAdapterConfig:
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"""Convert unified AdapterConfig to NWSAdapterConfig."""
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return NWSAdapterConfig(
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enabled=config.enabled,
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cadence_s=config.cadence_s,
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states=config.settings.get("states", []),
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contact_email=config.settings.get("contact_email", ""),
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)
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async def _run_adapter_loop(self, state: AdapterState) -> None:
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"""Run an adapter poll loop with rate-limit aware scheduling."""
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while not self._shutdown_event.is_set():
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# Calculate next poll time based on rate-limit guarantee
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now = datetime.now(timezone.utc)
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if state.last_completed_poll is not None:
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next_poll_at = state.last_completed_poll.timestamp() + state.config.cadence_s
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wait_time = max(0, next_poll_at - now.timestamp())
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else:
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# First poll - run immediately
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wait_time = 0
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if wait_time > 0:
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logger.debug(
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"Waiting for next poll",
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extra={
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"adapter": state.name,
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"wait_s": wait_time,
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"next_poll": datetime.fromtimestamp(
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now.timestamp() + wait_time, tz=timezone.utc
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).isoformat(),
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},
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)
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# Wait for either timeout or cancel signal
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try:
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await asyncio.wait_for(
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state.cancel_event.wait(),
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timeout=wait_time,
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)
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# Cancel event was set - check if we should exit or reschedule
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if self._shutdown_event.is_set():
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break
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# Clear the cancel event and re-evaluate schedule
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state.cancel_event.clear()
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continue
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except asyncio.TimeoutError:
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pass
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# Check shutdown before polling
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if self._shutdown_event.is_set():
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break
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# Check if adapter is still enabled
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if not state.config.enabled or state.config.is_paused:
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logger.info(
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"Adapter disabled/paused, stopping loop",
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extra={"adapter": state.name},
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)
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break
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poll_start = datetime.now(timezone.utc)
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try:
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async for event in state.adapter.poll():
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# Dedup check
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if state.adapter.is_published(event.id):
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state.adapter.bump_last_seen(event.id)
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continue
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# Build CloudEvent
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if self._cloudevents_config:
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envelope, msg_id = wrap_event(event, self._cloudevents_config)
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else:
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# Fallback for testing
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envelope = {"id": event.id, "data": event.data}
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msg_id = event.id
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subject = subject_for_event(event)
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# Publish
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await self._publish_event(subject, envelope, msg_id)
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state.adapter.mark_published(event.id)
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logger.info(
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"Published event",
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extra={"id": event.id, "subject": subject, "category": event.category}
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)
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# Publish success status
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await self._publish_meta(
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f"central.meta.adapter.{state.name}.status",
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{"ok": True, "ts": datetime.now(timezone.utc).isoformat()}
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)
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# Mark poll completion time for rate limiting
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state.last_completed_poll = datetime.now(timezone.utc)
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except Exception as e:
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logger.exception("Adapter poll failed", extra={"adapter": state.name})
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await self._publish_meta(
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f"central.meta.adapter.{state.name}.status",
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{
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"ok": False,
|
||||
"error": str(e),
|
||||
"ts": datetime.now(timezone.utc).isoformat()
|
||||
}
|
||||
)
|
||||
# Still mark completion time to avoid tight retry loops
|
||||
state.last_completed_poll = datetime.now(timezone.utc)
|
||||
|
||||
# Sweep old IDs
|
||||
swept = state.adapter.sweep_old_ids()
|
||||
if swept > 0:
|
||||
logger.info("Swept old published IDs", extra={"count": swept})
|
||||
|
||||
async def _start_adapter(self, config: AdapterConfig) -> None:
|
||||
"""Start an adapter based on its configuration."""
|
||||
if config.name in self._adapter_states:
|
||||
logger.warning(
|
||||
"Adapter already running",
|
||||
extra={"adapter": config.name},
|
||||
)
|
||||
return
|
||||
|
||||
if config.name == "nws":
|
||||
nws_config = self._adapter_config_to_nws_config(config)
|
||||
adapter = NWSAdapter(
|
||||
config=nws_config,
|
||||
cursor_db_path=CURSOR_DB_PATH,
|
||||
)
|
||||
await adapter.startup()
|
||||
|
||||
state = AdapterState(
|
||||
name=config.name,
|
||||
adapter=adapter,
|
||||
config=config,
|
||||
)
|
||||
state.task = asyncio.create_task(self._run_adapter_loop(state))
|
||||
self._adapter_states[config.name] = state
|
||||
|
||||
logger.info(
|
||||
"Adapter started",
|
||||
extra={
|
||||
"adapter": config.name,
|
||||
"cadence_s": config.cadence_s,
|
||||
},
|
||||
)
|
||||
else:
|
||||
logger.warning(
|
||||
"Unknown adapter type",
|
||||
extra={"adapter": config.name},
|
||||
)
|
||||
|
||||
async def _stop_adapter(self, name: str) -> None:
|
||||
"""Stop a running adapter."""
|
||||
state = self._adapter_states.pop(name, None)
|
||||
if state is None:
|
||||
return
|
||||
|
||||
# Signal the loop to stop
|
||||
state.cancel_event.set()
|
||||
|
||||
if state.task:
|
||||
state.task.cancel()
|
||||
try:
|
||||
await state.task
|
||||
except asyncio.CancelledError:
|
||||
pass
|
||||
|
||||
await state.adapter.shutdown()
|
||||
logger.info("Adapter stopped", extra={"adapter": name})
|
||||
|
||||
async def _reschedule_adapter(
|
||||
self,
|
||||
name: str,
|
||||
new_config: AdapterConfig,
|
||||
) -> None:
|
||||
"""Reschedule an adapter with new configuration.
|
||||
|
||||
Maintains rate-limit guarantee: next poll at
|
||||
(last_completed_poll + new_cadence_s), not now + new_cadence_s.
|
||||
"""
|
||||
state = self._adapter_states.get(name)
|
||||
if state is None:
|
||||
# Adapter not running - just start it
|
||||
await self._start_adapter(new_config)
|
||||
return
|
||||
|
||||
old_cadence = state.config.cadence_s
|
||||
new_cadence = new_config.cadence_s
|
||||
|
||||
# Update config
|
||||
state.config = new_config
|
||||
|
||||
# Update adapter's cadence
|
||||
state.adapter.cadence_s = new_cadence
|
||||
|
||||
# Update adapter settings if needed (e.g., states list)
|
||||
if name == "nws":
|
||||
nws_config = self._adapter_config_to_nws_config(new_config)
|
||||
state.adapter.states = set(s.upper() for s in nws_config.states)
|
||||
|
||||
# Calculate next poll time for logging
|
||||
if state.last_completed_poll:
|
||||
next_poll_at = datetime.fromtimestamp(
|
||||
state.last_completed_poll.timestamp() + new_cadence,
|
||||
tz=timezone.utc,
|
||||
)
|
||||
else:
|
||||
next_poll_at = datetime.now(timezone.utc)
|
||||
|
||||
logger.info(
|
||||
"Rescheduled adapter",
|
||||
extra={
|
||||
"adapter": name,
|
||||
"old_cadence_s": old_cadence,
|
||||
"new_cadence_s": new_cadence,
|
||||
"next_poll": next_poll_at.isoformat(),
|
||||
},
|
||||
)
|
||||
|
||||
# Signal the loop to re-evaluate its schedule
|
||||
state.cancel_event.set()
|
||||
|
||||
async def _on_config_change(self, table: str, key: str) -> None:
|
||||
"""Handle a configuration change notification.
|
||||
|
||||
Called when NOTIFY fires for config changes.
|
||||
"""
|
||||
if table != "adapters":
|
||||
return
|
||||
|
||||
adapter_name = key
|
||||
logger.info(
|
||||
"Config change received",
|
||||
extra={"table": table, "key": key},
|
||||
)
|
||||
|
||||
async with self._lock:
|
||||
# Fetch the current config for this adapter
|
||||
new_config = await self._config_source.get_adapter(adapter_name)
|
||||
current_state = self._adapter_states.get(adapter_name)
|
||||
|
||||
if new_config is None:
|
||||
# Adapter was deleted
|
||||
if current_state:
|
||||
await self._stop_adapter(adapter_name)
|
||||
logger.info(
|
||||
"Adapter deleted, stopped",
|
||||
extra={"adapter": adapter_name},
|
||||
)
|
||||
return
|
||||
|
||||
if not new_config.enabled or new_config.is_paused:
|
||||
# Adapter disabled or paused
|
||||
if current_state:
|
||||
await self._stop_adapter(adapter_name)
|
||||
logger.info(
|
||||
"Adapter disabled/paused, stopped",
|
||||
extra={
|
||||
"adapter": adapter_name,
|
||||
"enabled": new_config.enabled,
|
||||
"paused": new_config.is_paused,
|
||||
},
|
||||
)
|
||||
return
|
||||
|
||||
if current_state is None:
|
||||
# Adapter was enabled or created
|
||||
await self._start_adapter(new_config)
|
||||
logger.info(
|
||||
"Adapter enabled, started",
|
||||
extra={"adapter": adapter_name},
|
||||
)
|
||||
else:
|
||||
# Adapter config changed (cadence, settings)
|
||||
await self._reschedule_adapter(adapter_name, new_config)
|
||||
|
||||
async def _heartbeat_loop(self) -> None:
|
||||
"""Publish periodic heartbeats."""
|
||||
while not self._shutdown_event.is_set():
|
||||
uptime = (datetime.now(timezone.utc) - self._start_time).total_seconds()
|
||||
await self._publish_meta(
|
||||
"central.meta.heartbeat",
|
||||
{"ts": datetime.now(timezone.utc).isoformat(), "uptime_s": uptime}
|
||||
)
|
||||
try:
|
||||
await asyncio.wait_for(
|
||||
self._shutdown_event.wait(),
|
||||
timeout=30
|
||||
)
|
||||
except asyncio.TimeoutError:
|
||||
pass
|
||||
|
||||
async def start(self) -> None:
|
||||
"""Start the supervisor."""
|
||||
await self.connect()
|
||||
|
||||
# Load and start enabled adapters
|
||||
enabled_adapters = await self._config_source.list_enabled_adapters()
|
||||
for config in enabled_adapters:
|
||||
await self._start_adapter(config)
|
||||
|
||||
# Start config watcher (for DB source, this runs forever; for TOML, returns immediately)
|
||||
self._config_watch_task = asyncio.create_task(
|
||||
self._config_source.watch_for_changes(self._on_config_change)
|
||||
)
|
||||
|
||||
# Start heartbeat
|
||||
self._tasks.append(asyncio.create_task(self._heartbeat_loop()))
|
||||
|
||||
logger.info(
|
||||
"Supervisor started",
|
||||
extra={"adapters": list(self._adapter_states.keys())},
|
||||
)
|
||||
|
||||
async def stop(self) -> None:
|
||||
"""Stop the supervisor gracefully."""
|
||||
logger.info("Supervisor shutting down")
|
||||
self._shutdown_event.set()
|
||||
|
||||
# Cancel config watcher
|
||||
if self._config_watch_task:
|
||||
self._config_watch_task.cancel()
|
||||
try:
|
||||
await self._config_watch_task
|
||||
except asyncio.CancelledError:
|
||||
pass
|
||||
|
||||
# Cancel heartbeat and other tasks
|
||||
for task in self._tasks:
|
||||
task.cancel()
|
||||
try:
|
||||
await task
|
||||
except asyncio.CancelledError:
|
||||
pass
|
||||
|
||||
# Stop all adapters
|
||||
for name in list(self._adapter_states.keys()):
|
||||
await self._stop_adapter(name)
|
||||
|
||||
# Close config source
|
||||
await self._config_source.close()
|
||||
|
||||
await self.disconnect()
|
||||
logger.info("Supervisor stopped")
|
||||
|
||||
|
||||
async def async_main() -> None:
|
||||
"""Async entry point."""
|
||||
setup_logging()
|
||||
|
||||
settings = get_settings()
|
||||
logger.info(
|
||||
"Config source: %s",
|
||||
settings.config_source,
|
||||
extra={"config_source": settings.config_source},
|
||||
)
|
||||
|
||||
# Create config source based on setting
|
||||
config_source = await create_config_source(
|
||||
source_type=settings.config_source,
|
||||
dsn=settings.db_dsn,
|
||||
toml_path=settings.config_toml_path,
|
||||
)
|
||||
|
||||
# Load CloudEvents config for envelope generation
|
||||
# For now, load from TOML regardless of config source
|
||||
# (CloudEvents config is not adapter-specific)
|
||||
try:
|
||||
toml_config = load_config(str(settings.config_toml_path))
|
||||
cloudevents_config = toml_config
|
||||
except Exception:
|
||||
# If TOML doesn't exist and using DB source, create minimal config
|
||||
cloudevents_config = None
|
||||
|
||||
supervisor = Supervisor(
|
||||
config_source=config_source,
|
||||
nats_url=settings.nats_url,
|
||||
cloudevents_config=cloudevents_config,
|
||||
)
|
||||
|
||||
loop = asyncio.get_running_loop()
|
||||
shutdown_event = asyncio.Event()
|
||||
|
||||
def handle_signal() -> None:
|
||||
shutdown_event.set()
|
||||
|
||||
for sig in (signal.SIGTERM, signal.SIGINT):
|
||||
loop.add_signal_handler(sig, handle_signal)
|
||||
|
||||
await supervisor.start()
|
||||
|
||||
# Wait for shutdown signal
|
||||
await shutdown_event.wait()
|
||||
|
||||
await supervisor.stop()
|
||||
|
||||
|
||||
def main() -> None:
|
||||
"""Entry point."""
|
||||
asyncio.run(async_main())
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue