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cash
320
backend/web/db_extra.py
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320
backend/web/db_extra.py
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"""
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backend/web/db_extra.py - 16 May 2025
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"""
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from __future__ import annotations
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import asyncio
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import datetime as dt
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from datetime import timezone
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import structlog
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from typing import List
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from sqlalchemy import (
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Table, Column, Text, Float, Integer, Boolean, DateTime, func,
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select, insert, update, delete, or_, inspect, text
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)
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from sqlalchemy.dialects.postgresql import insert as pg_insert
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from backend.core.db import SessionLocal, metadata, engine
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from backend.core.settings import (
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MAX_IN_USE, FAIL_COOLDOWN_SEC, MIN_SCORE, PROXY_LIST_FILE,
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_WINDOW_MINUTES, PROXY_USERNAME, PROXY_PASSWORD,
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_MAX_LOGIN_FAILS, _MAX_INVALID_URLS
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)
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log = structlog.get_logger()
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_IS_PG = engine.url.get_backend_name().startswith("postgres")
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def _insert_ignore(tbl: Table, **vals):
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if _IS_PG:
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return pg_insert(tbl).values(**vals).on_conflict_do_nothing()
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return insert(tbl).prefix_with("OR IGNORE").values(**vals)
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def _clamp_zero(expr):
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"""SQL‑portable max(expr, 0)."""
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return func.greatest(expr, 0) if _IS_PG else func.max(expr, 0)
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proxy_tbl = Table(
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"proxies", metadata,
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Column("url", Text, primary_key=True),
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Column("score", Float, nullable=False, server_default="1.0"),
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Column("fails", Integer, nullable=False, server_default="0"),
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Column("banned", Boolean, nullable=False, server_default="false"),
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Column("in_use", Integer, nullable=False, server_default="0"),
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Column("last_fail", DateTime),
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Column("updated_at", DateTime, server_default=func.now(), index=True),
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)
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login_tbl = Table(
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"login_attempts", metadata,
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Column("ip", Text, primary_key=True),
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Column("count", Integer, nullable=False, server_default="0"),
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Column("updated_at", DateTime, nullable=False, server_default=func.now()),
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)
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invalid_tbl = Table(
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"invalid_urls", metadata,
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Column("ip", Text, primary_key=True),
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Column("count", Integer, nullable=False, server_default="0"),
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Column("updated_at", DateTime, nullable=False, server_default=func.now()),
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)
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dl_stats = Table(
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"dl_stats", metadata,
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Column("id", Integer, primary_key=True, autoincrement=True),
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Column("ok", Boolean, nullable=False),
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Column("ts", DateTime, nullable=False, server_default=func.now(), index=True),
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)
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def _ensure_proxy_columns() -> None:
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insp = inspect(engine)
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if "proxies" not in insp.get_table_names():
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return
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existing = {c["name"] for c in insp.get_columns("proxies")}
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add: list[tuple[str, str]] = []
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if "in_use" not in existing: add.append(("in_use", "INTEGER DEFAULT 0"))
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if "last_fail" not in existing: add.append(("last_fail", "TIMESTAMP"))
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if not add:
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return
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with engine.begin() as conn:
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for col, ddl in add:
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if _IS_PG:
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conn.execute(text(f"ALTER TABLE proxies ADD COLUMN IF NOT EXISTS {col} {ddl};"))
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else:
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conn.execute(text(f"ALTER TABLE proxies ADD COLUMN {col} {ddl};"))
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log.info("proxy.schema.auto_migrated", added=[c for c, _ in add])
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#metadata.create_all(engine)
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_ensure_proxy_columns()
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def _seed() -> None:
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if not PROXY_LIST_FILE.exists():
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return
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with SessionLocal.begin() as s:
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for ln in PROXY_LIST_FILE.read_text().splitlines():
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ln = ln.strip()
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if not ln:
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continue
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ip, port = ln.split(":", 1)
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px = (
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f"http://{PROXY_USERNAME}:{PROXY_PASSWORD}@{ip}:{port}"
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if PROXY_USERNAME else f"http://{ip}:{port}"
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)
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s.execute(_insert_ignore(proxy_tbl, url=px))
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def _candidate_stmt(now: dt.datetime):
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cool_ts = now - dt.timedelta(seconds=FAIL_COOLDOWN_SEC)
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jitter = func.random() * 0.01
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return (
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select(proxy_tbl.c.url)
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.where(
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proxy_tbl.c.banned.is_(False),
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proxy_tbl.c.score > MIN_SCORE,
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proxy_tbl.c.in_use < MAX_IN_USE,
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or_(proxy_tbl.c.last_fail.is_(None), proxy_tbl.c.last_fail < cool_ts),
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)
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.order_by((proxy_tbl.c.score + jitter).desc())
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.limit(1)
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.with_for_update(nowait=False)
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)
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def acquire_proxy() -> str | None:
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now = dt.datetime.now(timezone.utc)
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with SessionLocal.begin() as s:
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row = s.execute(_candidate_stmt(now)).first()
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if not row:
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return None
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px = row[0]
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s.execute(
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update(proxy_tbl)
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.where(proxy_tbl.c.url == px)
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.values(in_use=proxy_tbl.c.in_use + 1, updated_at=now)
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)
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return px
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def release_proxy(px: str, ok: bool) -> None:
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if not px or px == "DIRECT":
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return
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now = dt.datetime.now(timezone.utc)
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with SessionLocal.begin() as s:
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new_in_use = proxy_tbl.c.in_use - 1
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s.execute(
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update(proxy_tbl)
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.where(proxy_tbl.c.url == px)
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.values(
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in_use=_clamp_zero(new_in_use),
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updated_at=now,
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last_fail=None if ok else now,
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)
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)
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_buffer: asyncio.Queue[tuple[str, bool]] = asyncio.Queue(maxsize=2048)
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def queue_proxy_result(px: str, ok: bool) -> None:
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try:
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_buffer.put_nowait((px, ok))
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except asyncio.QueueFull:
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try:
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_buffer.get_nowait()
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_buffer.put_nowait((px, ok))
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except Exception:
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pass
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async def _flusher() -> None:
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while True:
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await asyncio.sleep(0.4)
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if _buffer.empty():
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continue
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batch: dict[str, tuple[int, int]] = {}
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while not _buffer.empty():
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px, ok = _buffer.get_nowait()
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succ, fail = batch.get(px, (0, 0))
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if ok:
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succ += 1
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else:
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fail += 1
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batch[px] = (succ, fail)
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now = dt.datetime.now(timezone.utc)
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with SessionLocal.begin() as s:
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for px, (succ, fail) in batch.items():
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delta = 0.1 * succ - 0.2 * fail
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stmt = (
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update(proxy_tbl)
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.where(proxy_tbl.c.url == px)
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.values(
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score=_clamp_zero(proxy_tbl.c.score + delta),
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fails=_clamp_zero(proxy_tbl.c.fails + fail - succ),
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banned=(proxy_tbl.c.fails + fail) > 5,
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updated_at=now,
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)
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)
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s.execute(stmt)
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def start_background_tasks(loop: asyncio.AbstractEventLoop) -> None:
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loop.create_task(_flusher())
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loop.create_task(asyncio.to_thread(_seed))
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_WINDOW_N = 50
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def add_dl_stat(ok: bool) -> None:
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now = dt.datetime.now(timezone.utc)
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with SessionLocal.begin() as s:
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s.execute(insert(dl_stats).values(ok=ok, ts=now))
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# -------- FIX ③ --------
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oldest_keep = select(dl_stats.c.id).order_by(
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dl_stats.c.id.desc()
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).limit(500)
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s.execute(
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delete(dl_stats).where(~dl_stats.c.id.in_(oldest_keep))
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)
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def recent_success_rate(n: int = _WINDOW_N) -> float:
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with SessionLocal() as s:
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vals = (
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s.execute(select(dl_stats.c.ok).order_by(dl_stats.c.id.desc()).limit(n))
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.scalars()
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.all()
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)
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return 0.5 if not vals else sum(vals) / len(vals)
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def _inc(table: Table, ip: str) -> None:
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now = dt.datetime.now(timezone.utc)
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with SessionLocal.begin() as s:
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row = s.execute(select(table).where(table.c.ip == ip)).first()
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if not row:
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s.execute(insert(table).values(ip=ip, count=1, updated_at=now))
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else:
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s.execute(
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update(table)
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.where(table.c.ip == ip)
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.values(count=row.count + 1, updated_at=now)
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)
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def record_login(ip: str, success: bool) -> None:
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if success:
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with SessionLocal.begin() as s:
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s.execute(update(login_tbl).where(login_tbl.c.ip == ip).values(count=0))
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else:
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_inc(login_tbl, ip)
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def inc_invalid(ip: str) -> None:
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_inc(invalid_tbl, ip)
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def _over_limit(table: Table, ip: str, cap: int) -> bool:
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with SessionLocal() as s:
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row = s.execute(
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select(table.c.count, table.c.updated_at).where(table.c.ip == ip)
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).first()
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if not row:
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return False
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count, ts = row
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now = dt.datetime.now(timezone.utc)
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if ts.tzinfo is None:
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ts = ts.replace(tzinfo=timezone.utc)
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if (now - ts).total_seconds() > _WINDOW_MINUTES * 60:
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with SessionLocal.begin() as sx:
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sx.execute(update(table).where(table.c.ip == ip).values(count=0))
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return False
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return count >= cap
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def too_many_attempts(ip: str) -> bool:
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return _over_limit(login_tbl, ip, _MAX_LOGIN_FAILS)
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def invalid_over_limit(ip: str) -> bool:
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return _over_limit(invalid_tbl, ip, _MAX_INVALID_URLS)
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def pick_proxy() -> str | None:
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return acquire_proxy()
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def ensure_proxy(px: str) -> None:
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with SessionLocal.begin() as s:
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s.execute(_insert_ignore(proxy_tbl, url=px))
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def update_proxy(px: str, ok: bool) -> None:
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queue_proxy_result(px, ok)
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async def init_proxy_seed() -> None:
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await asyncio.to_thread(_seed)
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