42 lines
1.5 KiB
Python
42 lines
1.5 KiB
Python
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"""
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Copyright 2024-2026 ReplyPier
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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from app.core.redis import get_redis
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from app.core.logger import get_logger
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logger = get_logger(__name__)
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# Platforms redeliver webhooks on slow acks/timeouts; remember processed
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# message ids long enough to absorb every retry cycle.
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DEDUPE_TTL_SECONDS = 60 * 60
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def is_duplicate_message(channel_type: str, external_message_id: str) -> bool:
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"""Atomically claim an inbound message id (Redis SETNX). Returns True when
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the message was already processed. Without Redis, dedupe is skipped —
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single-process deployments rarely see retries fast enough to matter."""
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if not external_message_id:
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return False
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try:
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redis_client = get_redis()
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if redis_client is None:
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return False
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key = f"channel_dedupe:{channel_type}:{external_message_id}"
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claimed = redis_client.set(key, "1", nx=True, ex=DEDUPE_TTL_SECONDS)
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return not claimed
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except Exception as e:
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logger.error(f"Dedupe check failed (processing anyway): {e}")
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return False
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