47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
import time
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from redis import Redis
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from common.extensions import cache_manager
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def perform_startup_actions(app):
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perform_startup_invalidation(app)
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def perform_startup_invalidation(app):
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"""
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Perform cache invalidation only once during startup using a persistent marker (also called flag or semaphore
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- see docs).
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Uses a combination of lock and marker to ensure invalidation happens exactly once
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per deployment.
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"""
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redis_client = Redis.from_url(app.config['REDIS_BASE_URI'])
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startup_time = int(time.time())
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marker_key = 'startup_invalidation_completed'
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lock_key = 'startup_invalidation_lock'
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try:
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# First try to get the lock
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lock = redis_client.lock(lock_key, timeout=30)
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if lock.acquire(blocking=False):
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try:
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# Check if invalidation was already performed
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if not redis_client.get(marker_key):
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# Perform invalidation
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cache_manager.invalidate_region('eveai_config')
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cache_manager.invalidate_region('eveai_chat_workers')
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redis_client.setex(marker_key, 180, str(startup_time))
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app.logger.info("Startup cache invalidation completed")
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else:
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app.logger.info("Startup cache invalidation already performed")
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finally:
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lock.release()
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else:
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app.logger.info("Another process is handling startup invalidation")
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except Exception as e:
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app.logger.error(f"Error during startup invalidation: {e}")
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# In case of error, we don't want to block the application startup
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pass |