zuochenyong
3f7b5167fa
Co-authored-by: guke <guke@wonderable.ai> Co-authored-by: 左辰勇 <exinglang@gmail.com> Reviewed-on: #167 Co-authored-by: zuochenyong <zuochenyong@wonderable.ai> Co-committed-by: zuochenyong <zuochenyong@wonderable.ai>
41 lines
1.5 KiB
Python
41 lines
1.5 KiB
Python
"""guide_video_play 加 (user_id, seq) 唯一约束:堵住并发 /start 绕过次数上限
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start_play 是无锁 check-then-insert(读 COUNT(*) 算 seq=used+1 再插一行),N 个并发
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/start 会都读到同一个 used、算出同一个 seq、各插一行拿到各自的 play_token,于是 3 次
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上限被绕过、每个 token 都能换 120 金币。加唯一键后并发同 seq 必撞,start_play 捕获
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IntegrityError 降级为 should_play=false(客户端照旧放广告)。
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用 unique index 而不是 batch_alter_table 加 UniqueConstraint:SQLite 加约束要整表重建,
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而 CREATE UNIQUE INDEX 两边都原生支持,回滚也干净。
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注:若库里已有并发产生的重复 (user_id, seq),建索引会失败 —— 本功能尚未上线,表通常是空的;
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真撞上了先按 seq 去重(留 id 最小的一行,多发的金币按 scripts/reset_guide_video.py 的口径退)。
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Revision ID: guide_video_user_seq_uq
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Revises: d9c03cc3ea07
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Create Date: 2026-07-24 10:00:00.000000
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"""
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from typing import Sequence, Union
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from alembic import op
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# revision identifiers, used by Alembic.
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revision: str = "guide_video_user_seq_uq"
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down_revision: Union[str, Sequence[str], None] = "d9c03cc3ea07"
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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def upgrade() -> None:
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op.create_index(
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"uq_guide_video_play_user_seq",
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"guide_video_play",
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["user_id", "seq"],
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unique=True,
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)
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def downgrade() -> None:
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op.drop_index("uq_guide_video_play_user_seq", table_name="guide_video_play")
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