38 lines
1.0 KiB
Python
38 lines
1.0 KiB
Python
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"""slow_sanctions and sanctions_errors -- phase-0-base-project-spec.md §7.
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Both flags belong to `sanctions`, the fake third-party watchlist vendor.
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"""
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import math
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import random
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from common.chaos_flags import is_enabled
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_MEDIAN_SECONDS = 0.04
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_P99_SECONDS = 1.8
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_MU = math.log(_MEDIAN_SECONDS)
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_Z99 = 2.326347874
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_SIGMA = (math.log(_P99_SECONDS) - _MU) / _Z99
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_TIMEOUT_TRIGGER_PROBABILITY = 0.015
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_TIMEOUT_TRIGGER_SECONDS = 5.0
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_ERROR_PROBABILITY = 0.03
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async def slow_sanctions_enabled() -> bool:
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return await is_enabled("slow_sanctions")
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async def sanctions_errors_enabled() -> bool:
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return await is_enabled("sanctions_errors")
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def sample_delay_seconds() -> float:
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"""Log-normal delay: median ~40ms, p99 ~1.8s. 1.5% of calls sleep 5s,
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which exceeds the caller's 3s downstream timeout and surfaces as one."""
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if random.random() < _TIMEOUT_TRIGGER_PROBABILITY:
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return _TIMEOUT_TRIGGER_SECONDS
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return random.lognormvariate(_MU, _SIGMA)
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def should_error() -> bool:
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return random.random() < _ERROR_PROBABILITY
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