44 lines
2.1 KiB
Python
44 lines
2.1 KiB
Python
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import hashlib
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import json
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from collections.abc import Awaitable, Callable
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from typing import Any
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from sqlalchemy import select
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from sqlalchemy.dialects.mysql import insert
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.core.contracts import RequestContext
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from app.core.errors import IdempotencyConflictError, ValidationAgentError
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from app.infrastructure.db import SessionFactory
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from app.repository.platform_repository import PlatformRepository
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def digest(value: Any) -> str:
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return hashlib.sha256(json.dumps(value, sort_keys=True, default=str,
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ensure_ascii=False).encode()).hexdigest()
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class ApiTransactionService:
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async def execute(
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self, context: RequestContext, scope: str, key: str | None, body: Any,
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action: Callable[[AsyncSession], Awaitable[dict[str, Any]]],
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) -> dict[str, Any]:
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if key is None or not 16 <= len(key) <= 128 or not key.isascii():
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raise ValidationAgentError("必须提供 16-128 位 ASCII Idempotency-Key")
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async with SessionFactory() as session, session.begin():
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table = await PlatformRepository(session).table("api_request_receipt")
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statement = insert(table).values(user_id=int(context.user_id), scope_hash=digest(scope),
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idempotency_key=key, request_hash=digest(body))
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await session.execute(statement.on_duplicate_key_update(id=table.c.id))
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row = (await session.execute(select(table).where(
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table.c.user_id == int(context.user_id), table.c.scope_hash == digest(scope),
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table.c.idempotency_key == key).with_for_update())).mappings().one()
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if row["request_hash"] != digest(body):
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raise IdempotencyConflictError("同一幂等键对应不同请求")
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if row["response_json"] is not None:
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return dict(row["response_json"])
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response = await action(session)
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await session.execute(table.update().where(table.c.id == row["id"])
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.values(response_json=response))
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return response
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