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from __future__ import annotations
import logging
from typing import Any, Dict, List, Optional, Tuple
import requests
from config.services_config import get_rerank_config, get_rerank_service_url
logger = logging.getLogger(__name__)
class HttpRerankProvider:
"""Rerank via HTTP service."""
def __init__(self, service_url: str):
self.service_url = (service_url or "").rstrip("/")
def rerank(
self,
query: str,
docs: List[str],
timeout_sec: float,
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) -> Tuple[Optional[List[float]], Optional[Dict[str, Any]]]:
if not docs:
return [], {}
try:
payload = {"query": (query or "").strip(), "docs": docs}
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response = requests.post(self.service_url, json=payload, timeout=timeout_sec)
if response.status_code != 200:
logger.warning(
"Rerank service HTTP %s: %s",
response.status_code,
(response.text or "")[:200],
)
return None, None
data = response.json()
scores = data.get("scores")
if not isinstance(scores, list):
return None, None
return scores, data.get("meta") or {}
except (requests.exceptions.ReadTimeout, requests.exceptions.ConnectTimeout) as exc:
logger.warning(
"Rerank request timed out after %.1fs (docs=%d); returning ES order. %s",
timeout_sec,
len(docs),
exc,
)
return None, None
except Exception as exc:
logger.warning("Rerank request failed: %s", exc, exc_info=True)
return None, None
def create_rerank_provider() -> HttpRerankProvider:
"""Create rerank provider from services config."""
cfg = get_rerank_config()
provider = (cfg.provider or "http").strip().lower()
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