copilot-swe-agent[bot]
0188575c27
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
88 lines
3.5 KiB
Python
88 lines
3.5 KiB
Python
"""
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Worker settings synchronisation helper.
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When an admin saves a configuration change through the UI, any running Celery
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workers still hold the *old* values in their in-process ``settings`` singleton.
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This module provides two complementary mechanisms to propagate the change:
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1. **Publish** (API side): :func:`notify_settings_updated` writes a monotonically
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increasing timestamp to a Redis key. This is called immediately after every
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successful ``save_setting_to_db`` / ``delete_setting_from_db`` operation.
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2. **Subscribe** (worker side): :func:`register_settings_reload_signal` installs
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a Celery ``task_prerun`` signal handler. Before each task begins the handler
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reads the Redis version key; if it has changed since the last reload it calls
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:func:`~app.utils.config_loader.reload_settings_from_db` so the worker picks
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up the new values *before* executing the task body.
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The Redis key used is ``docuelevate:settings_version``. Workers cache the last
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seen version in a module-level variable to avoid redundant DB round-trips when
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nothing has changed.
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"""
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import logging
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import time
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from typing import Any
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import redis
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from celery.signals import task_prerun
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logger = logging.getLogger(__name__)
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#: Redis key that stores the current settings "version" (epoch timestamp string).
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SETTINGS_VERSION_KEY = "docuelevate:settings_version"
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#: Module-level cache: the settings version seen by *this* process on its last reload.
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_last_seen_version: str = ""
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def notify_settings_updated() -> None:
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"""
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Publish a settings-updated signal by updating the Redis version key.
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Call this after every successful settings write so that all worker
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processes know they need to reload their in-memory configuration.
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Errors are caught and logged rather than raised so that a Redis
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connectivity issue does not prevent the primary save from succeeding.
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"""
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try:
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from app.config import settings
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r = redis.from_url(settings.redis_url, socket_connect_timeout=2)
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version = str(time.time())
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r.set(SETTINGS_VERSION_KEY, version)
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logger.debug(f"Settings version bumped to {version}")
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except Exception as exc:
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logger.warning(f"Could not publish settings update to Redis: {exc}")
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def register_settings_reload_signal() -> None:
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"""
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Install a Celery ``task_prerun`` signal handler for worker processes.
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This should be called once during Celery worker initialisation (e.g. from
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``celery_worker.py``). After registration, every task will check the
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settings version key in Redis before it starts and reload configuration
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from the database if a newer version is detected.
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"""
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@task_prerun.connect(weak=False)
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def _reload_if_stale(sender: Any, **kwargs: Any) -> None:
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"""Reload settings from DB if the Redis version key has changed."""
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global _last_seen_version
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try:
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from app.config import settings
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from app.utils.config_loader import reload_settings_from_db
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r = redis.from_url(settings.redis_url, socket_connect_timeout=2)
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current_version = (r.get(SETTINGS_VERSION_KEY) or b"").decode()
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if current_version and current_version != _last_seen_version:
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reload_settings_from_db(settings)
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_last_seen_version = current_version
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logger.info(f"Worker settings reloaded (version={current_version})")
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except Exception as exc:
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logger.debug(f"Settings version check skipped: {exc}")
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logger.info("Settings reload signal handler registered on task_prerun")
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