feat(translate): 接入腾讯 MaaS u2 作为 TMT 备用翻译通道
新通道:腾讯 MaaS u2 模型(云知声),OpenAI 兼容协议 - 端点:https://maas-api.hivoice.cn/v1 - 模型:u2(翻译专用,实测 + 锁定 prompt 后译文质量稳定) - 备用链路:TMT 配额耗尽 / TMT 失败时自动降级到 MaaS 关键 prompt 工程(锁定): - 必须用 user 提供的固定中文 prompt,否则 u2 会把译文放进 reasoning_content 而 content 返乱码 - 限定只接 EN/JA → ZH - 中文输入固定返回拒绝文案 新增/改动: - backend/app/services/translation/tencent_maas.py: 新建 - backend/app/services/translation/service.py: 备用链 maas → local,初始化失败友好降级 - backend/app/config.py: 加 tencent_maas_* 4 个配置 - .env.example: 文档化
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Mavis
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backend/app/services/translation/tencent_maas.py
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backend/app/services/translation/tencent_maas.py
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"""腾讯 MaaS 翻译(OpenAI 兼容协议)。
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- 端点:https://maas-api.hivoice.cn/v1
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- 模型:u2(翻译专用)
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- 鉴权:Bearer token(api_key 直接当 Bearer)
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- 请求:POST /chat/completions,system prompt 告诉模型做翻译
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设计上独立于 LlmClient(不走 agnes_* 配置),专门走 tencent_maas_* 配置,
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避免和 LLM 智能增强共用 client 的节流。
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"""
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from __future__ import annotations
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import asyncio
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import logging
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import random
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import httpx
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from app.config import settings
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from app.services.translation.base import BaseTranslator, TranslationResult
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logger = logging.getLogger("news.translate.tencent_maas")
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# 简单的源/目标语言映射(MaaS 模型期望 ISO 639-1 代码)
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_LANG_MAP = {
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"en": "English",
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"zh": "Chinese",
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"ja": "Japanese",
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"ko": "Korean",
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"fr": "French",
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"de": "German",
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"es": "Spanish",
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"ru": "Russian",
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"ar": "Arabic",
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}
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def _lang_label(code: str) -> str:
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"""把 ISO 639-1 转成自然语言名(给模型做 prompt 用)。"""
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if not code or code == "auto":
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return "the source language"
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c = code.split("-")[0].lower()
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return _LANG_MAP.get(c, c)
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# 经过反复测试,这个 prompt 是云知声 u2 模型的关键:
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# - 明确禁止 reasoning / 分析 / 注释(否则模型会把译文放进 reasoning_content)
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# - 限定只接 EN/JA → ZH(对应用户场景)
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# - 非英日输入时返回固定拒绝文案(便于上层识别)
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_SYSTEM_PROMPT = """你是一个即时翻译助手。对于用户输入的英文或日文文章,请直接输出对应的简体中文译文。严格遵守:
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不要进行任何分步思考、不要输出分析、不要添加注释或说明。
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只输出中文译文本身,不包含任何额外文字(如"翻译结果:"、"以下是中文:"等)。
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如果输入内容既非英文也非日文,仅回复:"仅支持英文或日文翻译为中文。" """
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class TencentMaaSTranslator(BaseTranslator):
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"""腾讯 MaaS 翻译(OpenAI 兼容协议,模型 u2)。"""
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name = "tencent_maas"
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def __init__(self):
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if not settings.tencent_maas_api_key:
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raise RuntimeError("Tencent MaaS api_key missing")
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self.api_key = settings.tencent_maas_api_key
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self.base_url = settings.tencent_maas_base_url.rstrip("/")
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self.model = settings.tencent_maas_model
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self.interval_sec = settings.tencent_maas_interval_sec
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def is_configured(self) -> bool:
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return bool(self.api_key)
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async def translate(
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self, text: str, source: str = "auto", target: str = "zh"
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) -> TranslationResult:
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"""翻译接口。
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注意:source/target 参数当前被忽略,因为 u2 模型在固定 system prompt 下
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会自行判断 EN/JA → ZH;保留参数是为了兼容 BaseTranslator 接口。
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"""
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if not text.strip():
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return TranslationResult(text=text, engine=self.name, chars=0)
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if not self.is_configured():
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raise RuntimeError("Tencent MaaS api_key missing")
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# 固定 system prompt(经过反复测试,这套 prompt 是云知声 u2 模型唯一能稳定输出
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# 译文到 content 字段的写法;改 prompt 格式会导致模型把译文放进 reasoning_content)
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system = _SYSTEM_PROMPT
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user = text
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url = f"{self.base_url}/chat/completions"
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payload = {
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"model": self.model,
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"messages": [
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{"role": "system", "content": system},
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{"role": "user", "content": user},
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],
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"temperature": 0.0,
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"max_tokens": max(256, len(text) * 3),
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}
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headers = {
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"Authorization": f"Bearer {self.api_key}",
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"Content-Type": "application/json",
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}
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# 简单串行 + 重试 1 次
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last_exc: Exception | None = None
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for attempt in range(2):
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try:
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async with httpx.AsyncClient(timeout=60.0) as client:
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r = await client.post(url, json=payload, headers=headers)
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if r.status_code >= 500:
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raise RuntimeError(f"TencentMaas 5xx: {r.status_code} {r.text[:200]}")
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if r.status_code != 200:
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raise RuntimeError(f"TencentMaas {r.status_code}: {r.text[:300]}")
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data = r.json()
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content = (
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data.get("choices", [{}])[0]
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.get("message", {})
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.get("content", "")
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.strip()
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)
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if not content:
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raise RuntimeError(f"TencentMaas empty content: {r.text[:300]}")
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# 节流(避免被 MaaS 限流)
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await asyncio.sleep(self.interval_sec)
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return TranslationResult(
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text=content, engine=self.name, chars=len(text), cached=False
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)
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except Exception as e:
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last_exc = e
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logger.warning("tencent_maas attempt %s failed: %s", attempt, e)
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if attempt == 0:
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await asyncio.sleep(0.5 + random.random())
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else:
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raise
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# 不可达
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assert last_exc is not None
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raise last_exc
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