2026-09-23 22:05:00 +08:00
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"""
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2026-10-26 00:50:43 +08:00
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Copyright 2024-2026 ReplyPier
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2026-09-23 22:05:00 +08:00
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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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Retry timing for queued work that calls other services (CRM pushes,
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webhooks to external apps).
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"""
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import random
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from typing import Optional
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def next_attempt_delay(attempts: int, *, base_seconds: float, max_seconds: float,
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jitter_seconds: float, retry_after_seconds: Optional[float] = None) -> float:
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"""Seconds to wait before attempt number `attempts + 1`.
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Exponential (base · 2^attempts) capped at `max_seconds`; a longer
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Retry-After from the other service wins; random jitter on top so a burst
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of failures doesn't retry in lockstep.
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"""
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backoff = min(base_seconds * (2 ** attempts), max_seconds)
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return max(retry_after_seconds or 0, backoff) + random.uniform(0, jitter_seconds)
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