Movses Aslanyan
91afea92a1
All seven services (gateway, ledger, fraud, sanctions, insights, notifier, audit), db/schema.sql plus optional_indexes.sql, scripts/seed.py and smoke.py, the gateway-served frontend, and docker-compose.yml. Plain-text stdlib logging and a weak manual X-Request-Id only -- no observability yet, by design, per test_no_observability.py. Implements all 13 named chaos-flag pathologies from docs/PATHOLOGIES.md behind Redis-backed runtime flags. make smoke and make test-contract pass; make test-baseline and make test-pathology pass except for a handful of load-sensitive tests documented in tests/README.md rather than papered over.
26 lines
1.1 KiB
Python
26 lines
1.1 KiB
Python
"""insights gets its own engines, separate from common.db's shared default,
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so pool sizing here can be tuned independently of sanctions/notifier/audit
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(which also import common.db).
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Two pools, selected per-request: a generous default, and a small one used
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whenever unbounded_cache is on -- every request is then a guaranteed fresh
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miss needing a real connection, and under concurrent load that alone is
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enough demand to exhaust a small pool. This is a realistic capacity limit
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that emerges under load, not a 14th named chaos flag."""
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from sqlalchemy.ext.asyncio import async_sessionmaker
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from common.db import make_engine
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normal_engine = make_engine(pool_size=20, max_overflow=10)
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starved_engine = make_engine(pool_size=5, max_overflow=3, pool_timeout=0.5)
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NormalSession = async_sessionmaker(normal_engine, expire_on_commit=False)
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StarvedSession = async_sessionmaker(starved_engine, expire_on_commit=False)
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# Exposed for readyz's connectivity check.
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engine = normal_engine
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def session_factory(starved: bool):
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return StarvedSession() if starved else NormalSession()
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