"""Configuration loading from environment variables."""
from __future__ import annotations
import os
from dataclasses import dataclass
from dotenv import load_dotenv
# Load .env once at import time. Existing environment variables take
# precedence over values defined in .env (the python-dotenv default).
load_dotenv()
def _parse_api_keys(raw: str | None) -> frozenset[str]:
"""Parse a comma-separated list of API keys into a frozenset.
Strips whitespace from each key and discards empty strings.
Returns an empty frozenset when *raw* is ``None`` or blank,
which signals that auth is disabled.
"""
if not raw:
return frozenset()
return frozenset(k for k in (k.strip() for k in raw.split(",")) if k)
@dataclass(frozen=True)
class Settings:
"""Application settings loaded from environment variables."""
api_base_url: str
api_key: str | None
mcp_transport: str
mcp_host: str
mcp_port: int
mcp_api_keys: frozenset[str]
log_level: str
log_format: str
_settings: Settings | None = None
def get_settings() -> Settings:
"""Load settings from environment variables (cached after first call)."""
global _settings
if _settings is not None:
return _settings
_settings = Settings(
api_base_url=os.environ.get(
"LEVELANG_API_BASE_URL",
"http://localhost:8000/api/v1",
),
api_key=os.environ.get("LEVELANG_API_KEY"),
mcp_transport=os.environ.get("MCP_TRANSPORT", "stdio"),
mcp_host=os.environ.get("MCP_HOST", "127.0.0.1"),
mcp_port=int(os.environ.get("MCP_PORT", "8463")),
mcp_api_keys=_parse_api_keys(os.environ.get("MCP_API_KEYS")),
log_level=os.environ.get("LOG_LEVEL", "INFO"),
log_format=os.environ.get("LOG_FORMAT", "auto"),
)
return _settings
def reset_settings() -> None:
"""Reset cached settings (useful for testing)."""
global _settings
_settings = None
