cd4ce66d
 tangwang
trans logs
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"""Shared translation cache utilities."""
from __future__ import annotations
import hashlib
import logging
from typing import Mapping, Optional
import redis
from config.env_config import REDIS_CONFIG
logger = logging.getLogger(__name__)
class TranslationCache:
"""Redis-backed cache shared by all translation capabilities."""
def __init__(self, config: Mapping[str, object]) -> None:
self.ttl_seconds = int(config["ttl_seconds"])
self.sliding_expiration = bool(config["sliding_expiration"])
self.redis_client = self._init_redis_client()
@property
def available(self) -> bool:
return self.redis_client is not None
def build_key(self, *, model: str, target_lang: str, source_text: str) -> str:
normalized_model = str(model or "").strip().lower()
normalized_target_lang = str(target_lang or "").strip().lower()
text = str(source_text or "")
text_prefix = text[:4]
digest = hashlib.sha256(text.encode("utf-8")).hexdigest()
return f"trans:{normalized_model}:{normalized_target_lang}:{text_prefix}{digest}"
def get(self, *, model: str, target_lang: str, source_text: str) -> Optional[str]:
if self.redis_client is None:
return None
key = self.build_key(model=model, target_lang=target_lang, source_text=source_text)
try:
value = self.redis_client.get(key)
logger.info(
"Translation cache %s | model=%s target_lang=%s text_len=%s key=%s",
"hit" if value is not None else "miss",
model,
target_lang,
len(str(source_text or "")),
key,
)
if value and self.sliding_expiration:
self.redis_client.expire(key, self.ttl_seconds)
return value
except Exception as exc:
logger.warning("Redis get translation cache failed: %s", exc)
return None
def set(self, *, model: str, target_lang: str, source_text: str, translated_text: str) -> None:
if self.redis_client is None:
return
key = self.build_key(model=model, target_lang=target_lang, source_text=source_text)
try:
self.redis_client.setex(key, self.ttl_seconds, translated_text)
logger.info(
"Translation cache write | model=%s target_lang=%s text_len=%s result_len=%s ttl_seconds=%s key=%s",
model,
target_lang,
len(str(source_text or "")),
len(str(translated_text or "")),
self.ttl_seconds,
key,
)
except Exception as exc:
logger.warning("Redis set translation cache failed: %s", exc)
@staticmethod
def _init_redis_client() -> Optional[redis.Redis]:
try:
client = redis.Redis(
host=REDIS_CONFIG.get("host", "localhost"),
port=REDIS_CONFIG.get("port", 6479),
password=REDIS_CONFIG.get("password"),
decode_responses=True,
socket_timeout=REDIS_CONFIG.get("socket_timeout", 1),
socket_connect_timeout=REDIS_CONFIG.get("socket_connect_timeout", 1),
retry_on_timeout=REDIS_CONFIG.get("retry_on_timeout", False),
health_check_interval=10,
)
client.ping()
return client
except Exception as exc:
logger.warning("Failed to initialize translation redis cache: %s", exc)
return None
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