211 lines
6.6 KiB
Python
211 lines
6.6 KiB
Python
import math
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.models.user import User
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from app.models.credit_record import CreditRecord
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from app.models.system_config import SystemConfig
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from app.models.video_engine import VideoEngine
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from app.models.image_engine import ImageEngine
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from app.models.credit_ratio import CreditRatio
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from app.utils.id_gen import generate_id
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from app.utils.exceptions import InsufficientCreditsError
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async def calc_text_credits(db: AsyncSession, input_tokens: int, output_tokens: int) -> float:
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"""Calculate text credits based on actual token usage and configurable rate."""
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result = await db.execute(
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select(SystemConfig).where(SystemConfig.key == "text_credits_per_1000_tokens").limit(1)
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)
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config = result.scalar_one_or_none()
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rate = float(config.value) if config else 1.0
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total_tokens = input_tokens + output_tokens
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return round(total_tokens * rate / 1000, 2)
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async def _get_credit_ratio(
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db: AsyncSession,
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*,
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gen_type: str,
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resolution: str,
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engine_id: str | None = None,
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) -> CreditRatio | None:
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"""按引擎精确规则优先获取积分规则；找不到时回退到同类型同参数最高规则。"""
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gen_type = (gen_type or "").lower().strip()
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resolution = (resolution or "").strip()
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engine_id = (engine_id or "").strip() or None
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if engine_id:
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result = await db.execute(
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select(CreditRatio)
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.where(CreditRatio.gen_type == gen_type)
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.where(CreditRatio.model_config_id == engine_id)
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.where(CreditRatio.resolution == resolution)
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.order_by(CreditRatio.base_credits.desc(), CreditRatio.per_second_credits.desc())
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.limit(1)
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)
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ratio = result.scalar_one_or_none()
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if ratio:
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return ratio
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result = await db.execute(
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select(CreditRatio)
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.where(CreditRatio.gen_type == gen_type)
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.where(CreditRatio.resolution == resolution)
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.order_by(CreditRatio.base_credits.desc(), CreditRatio.per_second_credits.desc())
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.limit(1)
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)
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return result.scalar_one_or_none()
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async def calc_video_credits(
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db: AsyncSession,
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duration: int,
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resolution: str,
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engine_id: str | None = None,
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) -> float:
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"""Calculate video credits using CreditRatio table, with fallback to hardcoded.
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查询优先级：
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1. gen_type=video + engine_id + resolution 精确规则；
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2. gen_type=video + resolution 下 base_credits/per_second_credits 最高规则；
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3. 原硬编码默认算法。
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"""
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# 如果engine_id为空，默认查询权重最高的视频引擎积分规则
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if not engine_id:
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video_engines_result = await db.execute(
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select(VideoEngine.id)
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.where(VideoEngine.is_active == True)
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.order_by(VideoEngine.priority.desc())
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.limit(1)
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)
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engine_id = video_engines_result.scalar_one_or_none()
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ratio = await _get_credit_ratio(
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db,
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gen_type="video",
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resolution=resolution,
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engine_id=engine_id,
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)
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if ratio:
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return round((ratio.base_credits + ratio.per_second_credits * duration) * ratio.ratio, 2)
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# Fallback
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base = 60.0
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duration_cost = duration * 2.0
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multiplier = {"480p": 1, "1080p": 2, "720p": 1.5}.get(resolution, 1.0)
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return round((base + duration_cost) * multiplier, 2)
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def calc_credits(duration: int, resolution: str) -> float:
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"""Legacy: hardcoded credit calculation. Prefer calc_video_credits for new code."""
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base = 60.0
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duration_cost = duration * 2.0
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multiplier = {"480p": 2.5, "1080p": 1.5, "720p": 1.0}.get(resolution, 1.0)
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return round((base + duration_cost) * multiplier, 2)
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async def calc_image_credits(
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db: AsyncSession,
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image_size: str,
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engine_id: str | None = None,
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) -> float:
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"""Calculate image credits using CreditRatio table, with fallback to hardcoded.
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查询优先级：
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1. gen_type=image + engine_id + image_size 精确规则；
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2. gen_type=image + image_size 下 base_credits/per_second_credits 最高规则；
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3. 原硬编码默认算法。
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"""
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# 如果engine_id为空，默认查询权重最高的图片引擎积分规则
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if not engine_id:
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image_engines_result = await db.execute(
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select(ImageEngine.id)
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.where(ImageEngine.is_active == True)
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.order_by(ImageEngine.priority.desc())
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.limit(1)
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)
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engine_id = image_engines_result.scalar_one_or_none()
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ratio = await _get_credit_ratio(
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db,
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gen_type="image",
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resolution=image_size,
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engine_id=engine_id,
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)
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if ratio:
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return round(ratio.base_credits * ratio.ratio, 2)
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# Fallback
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multiplier = {"4K": 2.0, "2K": 1.0}.get(image_size, 1.0)
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base_cost = 4.0
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return round(base_cost * multiplier, 2)
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async def deduct_credits(
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db: AsyncSession,
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user_id: str,
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amount: float,
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description: str,
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related_id: str | None = None,
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) -> User:
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"""Atomically deduct credits from user. Raises InsufficientCreditsError."""
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result = await db.execute(
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select(User).where(User.id == user_id).limit(1)
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)
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user = result.scalar_one_or_none()
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if not user or user.credits < amount:
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raise InsufficientCreditsError()
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user.credits = round(user.credits - amount, 2)
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record = CreditRecord(
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id=generate_id(),
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user_id=user_id,
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type="consume",
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amount=-round(amount, 2),
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balance_after=user.credits,
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description=description,
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related_id=related_id,
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)
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db.add(record)
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await db.flush()
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return user
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async def add_credits(
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db: AsyncSession,
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user_id: str,
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amount: float,
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description: str,
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related_id: str | None = None,
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) -> User:
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"""Add credits to user."""
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result = await db.execute(
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select(User).where(User.id == user_id).limit(1)
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)
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user = result.scalar_one_or_none()
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if not user:
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raise ValueError("User not found")
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user.credits = round(user.credits + amount, 2)
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record = CreditRecord(
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id=generate_id(),
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user_id=user_id,
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type="recharge",
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amount=round(amount, 2),
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balance_after=user.credits,
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description=description,
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related_id=related_id,
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)
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db.add(record)
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await db.flush()
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return user
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async def get_records(db: AsyncSession, user_id: str) -> list[CreditRecord]:
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result = await db.execute(
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select(CreditRecord)
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.where(CreditRecord.user_id == user_id)
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.order_by(CreditRecord.created_at.desc())
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)
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return list(result.scalars().all())
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