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48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
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"""
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计费相关 token 归一化工具。
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"""
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from __future__ import annotations
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from src.core.api_format.enums import ApiFamily
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from src.core.api_format.signature import parse_signature_key
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def _get_api_family(api_format: str | None) -> ApiFamily | None:
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"""解析 api_format 字符串，返回对应的 ApiFamily 枚举。"""
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if not api_format:
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return None
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text = str(api_format).strip()
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if not text:
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return None
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sig = parse_signature_key(text)
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return sig.api_family
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def normalize_input_tokens_for_billing(
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api_format: str | None,
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input_tokens: int,
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cache_read_tokens: int,
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) -> int:
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"""
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归一化 `input_tokens`，使其在计费中表示"非缓存输入 token"。
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计费口径：`input_tokens`=非缓存输入 token；`cache_read_tokens`=缓存命中 token（折扣/免费维度）。
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- Claude 系：保持上游口径（不扣除），因为 Claude API 的 input_tokens 本身就不包含缓存部分。
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- OpenAI 系：`input_tokens` 包含缓存命中部分，需要扣除 `cache_read_tokens`。
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- Gemini 系：`promptTokenCount` 包含 `cachedContentTokenCount`，需要扣除。
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"""
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if input_tokens <= 0:
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return 0 if input_tokens == 0 else input_tokens
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if cache_read_tokens <= 0:
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return input_tokens
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api_family = _get_api_family(api_format)
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if api_family == ApiFamily.CLAUDE:
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return input_tokens
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if api_family in (ApiFamily.OPENAI, ApiFamily.GEMINI):
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return max(input_tokens - cache_read_tokens, 0)
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# 未知格式，保守处理，不扣除
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return input_tokens
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