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
This commit is contained in:
Mavis
@@ -1,4 +1,10 @@
|
||||
"""翻译服务门面:配额检查 + 缓存 + 引擎选择 + 月度计数。"""
|
||||
"""翻译服务门面:配额检查 + 缓存 + 引擎选择 + 月度计数。
|
||||
|
||||
引擎链路(优先级降序):
|
||||
1. tencent TMT(主,按月配额)
|
||||
2. tencent_maas(备用,OpenAI 兼容,无配额;主失败/TMT 配额耗尽时启用)
|
||||
3. local(最后兜底,需 settings.local_translate_enabled=true)
|
||||
"""
|
||||
from __future__ import annotations
|
||||
|
||||
import asyncio
|
||||
@@ -12,6 +18,7 @@ from app.redis_client import get_redis
|
||||
from app.services.translation.base import BaseTranslator, TranslationResult
|
||||
from app.services.translation.local import LocalTranslator
|
||||
from app.services.translation.tencent import TencentTranslator
|
||||
from app.services.translation.tencent_maas import TencentMaaSTranslator
|
||||
|
||||
logger = logging.getLogger("news.translate.service")
|
||||
|
||||
@@ -30,16 +37,33 @@ def _month_key() -> str:
|
||||
class TranslationService:
|
||||
def __init__(self):
|
||||
self._tencent: BaseTranslator | None = None
|
||||
self._tencent_maas: BaseTranslator | None = None
|
||||
self._local: BaseTranslator | None = None
|
||||
# 串行:1 个并发;避免触发腾讯 TMT 限速
|
||||
self._sem = asyncio.Semaphore(1)
|
||||
|
||||
def _primary(self) -> BaseTranslator:
|
||||
def _primary(self) -> BaseTranslator | None:
|
||||
"""主引擎:腾讯 TMT(初始化失败返回 None 表示不可用)。"""
|
||||
if self._tencent is None:
|
||||
self._tencent = TencentTranslator()
|
||||
try:
|
||||
self._tencent = TencentTranslator()
|
||||
except Exception as e:
|
||||
logger.warning("tencent TMT init failed: %s", e)
|
||||
self._tencent = None
|
||||
return self._tencent
|
||||
|
||||
def _fallback(self) -> BaseTranslator | None:
|
||||
def _maas(self) -> BaseTranslator | None:
|
||||
"""备用引擎:腾讯 MaaS(OpenAI 兼容,无配额)。"""
|
||||
if self._tencent_maas is None and settings.tencent_maas_api_key:
|
||||
try:
|
||||
self._tencent_maas = TencentMaaSTranslator()
|
||||
except Exception as e:
|
||||
logger.warning("tencent MaaS init failed: %s", e)
|
||||
self._tencent_maas = None
|
||||
return self._tencent_maas
|
||||
|
||||
def _local_translator(self) -> BaseTranslator | None:
|
||||
"""最后兜底:本地模型(需开关)。"""
|
||||
if self._local is None and settings.local_translate_enabled:
|
||||
try:
|
||||
self._local = LocalTranslator()
|
||||
@@ -48,6 +72,13 @@ class TranslationService:
|
||||
self._local = None
|
||||
return self._local
|
||||
|
||||
# 兼容旧调用点:返回第一个可用的 fallback(优先 maas,次 local)
|
||||
def _fallback(self) -> BaseTranslator | None:
|
||||
m = self._maas()
|
||||
if m is not None:
|
||||
return m
|
||||
return self._local_translator()
|
||||
|
||||
async def can_use_tencent(self, chars: int) -> bool:
|
||||
if not settings.tencentcloud_secret_id:
|
||||
return False
|
||||
@@ -87,52 +118,62 @@ class TranslationService:
|
||||
if cached is not None:
|
||||
return TranslationResult(text=cached, engine="cache", chars=chars, cached=True)
|
||||
|
||||
# 2) 选引擎
|
||||
# 2) 选引擎(主 → maas 备用 → local 兜底)
|
||||
use_tencent = await self.can_use_tencent(chars)
|
||||
engine: BaseTranslator
|
||||
if use_tencent:
|
||||
engine = self._primary()
|
||||
engine: BaseTranslator | None = self._primary()
|
||||
if engine is None:
|
||||
# TMT 配了 key 但初始化失败 → 直接走 maas
|
||||
logger.warning("TMT unavailable, falling back to MaaS")
|
||||
engine = self._maas()
|
||||
else:
|
||||
fb = self._fallback()
|
||||
if fb is None:
|
||||
# 没本地:返回原文 + 标记
|
||||
engine = None
|
||||
|
||||
if engine is None:
|
||||
# 配额耗尽 / TMT 不可用:走备用链
|
||||
engine = self._maas() or self._local_translator()
|
||||
if engine is None:
|
||||
# 全无可用:返回原文 + 标记
|
||||
return TranslationResult(
|
||||
text=text + "\n\n[本条未翻译:配额耗尽且未启用本地翻译]",
|
||||
text=text + "\n\n[本条未翻译:所有翻译通道不可用]",
|
||||
engine="skip",
|
||||
chars=chars,
|
||||
)
|
||||
engine = fb
|
||||
logger.info("fallback to local translator for %d chars", chars)
|
||||
if engine.name == "tencent_maas":
|
||||
logger.info("tencent quota exhausted, fallback to tencent_maas for %d chars", chars)
|
||||
else:
|
||||
logger.info("fallback to local translator for %d chars", chars)
|
||||
|
||||
# 3) 调用
|
||||
# 3) 调用(失败时降级)
|
||||
async with self._sem:
|
||||
res = None
|
||||
res: TranslationResult | None = None
|
||||
try:
|
||||
res = await engine.translate(text, source=source, target=target)
|
||||
except Exception as e:
|
||||
# 失败:降级
|
||||
logger.exception("translate failed with %s: %s", engine.name, e)
|
||||
fb = self._fallback()
|
||||
if fb is not None and engine is not fb:
|
||||
# 按 maas → local 顺序找一个不同的 fallback
|
||||
fb = self._maas() if engine.name != "tencent_maas" else None
|
||||
if fb is None and settings.local_translate_enabled and engine.name != "local":
|
||||
fb = self._local_translator()
|
||||
if fb is not None:
|
||||
try:
|
||||
res = await fb.translate(text, source=source, target=target)
|
||||
logger.info("fallback %s succeeded after %s failed", fb.name, engine.name)
|
||||
except Exception as e2:
|
||||
logger.exception("fallback %s also failed: %s", fb.name, e2)
|
||||
res = None
|
||||
if res is None:
|
||||
# 主 + fallback 都失败:抛异常,让上层标记 status=failed
|
||||
raise RuntimeError(f"translation failed for {chars} chars (engine={engine.name})")
|
||||
|
||||
# 4) 写缓存 — 只缓存真实翻译结果;失败/降级文本不缓存(避免污染 30 天)
|
||||
if res.engine in ("tencent", "nllb", "cache") and not res.cached:
|
||||
# 二次保险:如果文本里仍含错误标记,也不缓存
|
||||
if res.engine in ("tencent", "tencent_maas", "nllb") and not res.cached:
|
||||
if "[翻译失败" not in res.text and "[本条未翻译" not in res.text:
|
||||
try:
|
||||
await r.set(ck, res.text, ex=60 * 60 * 24 * 30) # 30 天
|
||||
except Exception:
|
||||
pass
|
||||
|
||||
# 5) 计数(只在 tencent 上计)
|
||||
# 5) 计数(只在 tencent TMT 上计;maas/local 都不计腾讯云配额)
|
||||
if res.engine == "tencent":
|
||||
try:
|
||||
await self.add_usage(res.chars or chars)
|
||||
|
||||
Reference in New Issue
Block a user