client.py
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"""HTTP client for the translation service."""
from __future__ import annotations
import logging
from typing import List, Optional, Sequence, Union
import requests
from config.loader import get_app_config
from translation.settings import normalize_translation_model, normalize_translation_scene
logger = logging.getLogger(__name__)
class TranslationServiceClient:
"""Business-side translation client that talks to the translator service."""
def __init__(
self,
*,
base_url: Optional[str] = None,
default_model: Optional[str] = None,
default_scene: Optional[str] = None,
timeout_sec: Optional[float] = None,
) -> None:
cfg = get_app_config().services.translation.as_dict()
self.base_url = str(base_url or cfg["service_url"]).rstrip("/")
self.default_model = normalize_translation_model(cfg, default_model or cfg["default_model"])
self.default_scene = normalize_translation_scene(cfg, default_scene or cfg["default_scene"])
self.timeout_sec = float(cfg["timeout_sec"] if timeout_sec is None else timeout_sec)
@property
def model(self) -> str:
return self.default_model
@property
def supports_batch(self) -> bool:
return True
def translate(
self,
text: Union[str, Sequence[str]],
target_lang: str,
source_lang: Optional[str] = None,
scene: Optional[str] = None,
model: Optional[str] = None,
) -> Union[Optional[str], List[Optional[str]]]:
if isinstance(text, tuple):
text = list(text)
payload = {
"text": text,
"target_lang": target_lang,
"source_lang": source_lang,
"model": (model or self.default_model),
"scene": self.default_scene if scene is None else scene,
}
try:
response = requests.post(
f"{self.base_url}/translate",
json=payload,
timeout=self.timeout_sec,
)
if response.status_code != 200:
logger.warning(
"Translation service request failed: status=%s body=%s",
response.status_code,
(response.text or "")[:300],
)
return self._empty_result_for(text)
data = response.json()
return data.get("translated_text")
except Exception as exc:
logger.warning("Translation service request error: %s", exc, exc_info=True)
return self._empty_result_for(text)
@staticmethod
def _empty_result_for(
text: Union[str, Sequence[str]],
) -> Union[Optional[str], List[Optional[str]]]:
if isinstance(text, (list, tuple)):
return [None for _ in text]
return None
def create_translation_client() -> TranslationServiceClient:
"""Create the business-side translation client."""
return TranslationServiceClient()