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ThearchyHelios
118 lines
5.1 KiB
Python
118 lines
5.1 KiB
Python
"""几个进程共用的计数：访问密钥每分钟限流的令牌桶（auth/keys）、登录失败的退避（auth/sessions）。
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应用库是 PostgreSQL（可以多进程）时记在库里（rate_counters），一次请求一句带条件的 upsert：令牌桶「补多少、扣一个」在一句
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INSERT … ON CONFLICT DO UPDATE … WHERE 里算完，几个进程同时来也扣不过头；登录失败先把次数加一、占住那一行，再按次数算要等
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多久。SQLite 只有一个进程，计数照旧在进程里（调用方自己的那份），不为每个请求多写一次库——单进程时进程就是全站。
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时间用墙钟（time.time）：几台机器各自的单调时钟不能比，墙钟要对时（NTP），同租约。
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"""
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from __future__ import annotations
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import math
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import time
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from datetime import datetime, timedelta, timezone
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from sqlalchemy import delete, select
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from app.cluster.service import started
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from app.core.config import settings
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from app.db.base import SessionLocal, utcnow
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def shared() -> bool:
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"""计数要不要记在库里：PostgreSQL、而且起了协调（服务在跑）。测试、脚本里直接调用时照旧在进程里。"""
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return settings.db_dialect == "postgresql" and started()
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def _expiry(seconds: float) -> datetime:
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return utcnow() + timedelta(seconds=seconds)
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async def take_token(key: str, *, per_minute: int, now: float | None = None) -> int:
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"""令牌桶：满桶 per_minute 个，每秒补 per_minute / 60 个。放行交回 0，超了交回还要等几秒。"""
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from sqlalchemy.dialects.postgresql import insert
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from app.db.models_cluster import RateCounter as Row
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rate = per_minute / 60.0
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cap = float(per_minute)
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moment = time.time() if now is None else now
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refill = func_least(cap, Row.value + (moment - Row.at) * rate)
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stmt = insert(Row).values(key=key, count=1, value=cap - 1.0, at=moment, expires_at=_expiry(120)) \
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.on_conflict_do_update(index_elements=[Row.key],
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set_={"value": refill - 1.0, "at": moment, "count": Row.count + 1,
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"expires_at": _expiry(120)},
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where=refill >= 1.0) \
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.returning(Row.value)
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async with SessionLocal() as session:
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got = (await session.execute(stmt)).first()
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if got is not None:
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await session.commit()
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return 0
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row = await session.get(Row, key)
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await session.rollback()
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tokens = min(cap, float(row.value) + (moment - float(row.at)) * rate) if row is not None else 0.0
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return max(1, math.ceil((1.0 - tokens) / rate))
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def func_least(a: float, b: object) -> object:
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from sqlalchemy import func
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return func.least(a, b)
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async def wait_seconds(*keys: str) -> int:
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"""登录失败退避：这几个键里还要等多久（秒），不用等为 0。"""
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from app.db.models_cluster import RateCounter as Row
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if not keys:
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return 0
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now = time.time()
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async with SessionLocal() as session:
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rows = (await session.execute(select(Row.value).where(Row.key.in_([f"login:{k}" for k in keys])))).scalars()
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until = max((float(v) for v in rows), default=0.0)
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return int(until - now) + 1 if until > now else 0
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async def failed(*keys: str, free_tries: int, max_wait_s: int) -> None:
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"""记一次登录失败：次数加一，满 free_tries 次之后要等 2^(次数-free_tries) 秒（最多 max_wait_s）。"""
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from sqlalchemy import update
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from sqlalchemy.dialects.postgresql import insert
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from app.db.models_cluster import RateCounter as Row
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now = time.time()
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async with SessionLocal() as session:
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for key in keys:
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name = f"login:{key}"
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count = (await session.execute(
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insert(Row).values(key=name, count=1, value=0.0, at=now, expires_at=_expiry(86400))
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.on_conflict_do_update(index_elements=[Row.key], set_={"count": Row.count + 1, "at": now,
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"expires_at": _expiry(86400)})
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.returning(Row.count))).scalar_one()
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wait = 0 if count < free_tries else min(2 ** (count - free_tries), max_wait_s)
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await session.execute(update(Row).where(Row.key == name).values(value=now + wait)
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.execution_options(synchronize_session=False))
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await session.commit()
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async def succeeded(*keys: str) -> None:
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from app.db.models_cluster import RateCounter as Row
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async with SessionLocal() as session:
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await session.execute(delete(Row).where(Row.key.in_([f"login:{k}" for k in keys])))
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await session.commit()
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async def prune(now: datetime | None = None) -> int:
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"""到期的计数删掉（当班进程做）。"""
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from app.db.models_cluster import RateCounter as Row
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async with SessionLocal() as session:
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done = await session.execute(delete(Row).where(Row.expires_at < (now or datetime.now(timezone.utc))))
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await session.commit()
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return int(done.rowcount or 0)
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__all__ = ["failed", "prune", "shared", "succeeded", "take_token", "wait_seconds"]
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