refactor: standardize .env loading behavior across modules

- Use .env from current folder for each lightrag instance
- Allow different .env files for different instances
- Make OS env vars take precedence over .env file

lightrag/api/auth.py

@@ -5,7 +5,10 @@ from fastapi import HTTPException, status
 from pydantic import BaseModel
 from dotenv import load_dotenv
 
-load_dotenv()
+# use the .env that is inside the current folder
+# allows to use different .env file for each lightrag instance
+# the OS environment variables take precedence over the .env file
+load_dotenv(dotenv_path=".env", override=False)
 
 
 class TokenPayload(BaseModel):

lightrag/api/lightrag_server.py

@@ -47,10 +47,10 @@ from lightrag.kg.shared_storage import (
 from fastapi.security import OAuth2PasswordRequestForm
 from lightrag.api.auth import auth_handler
 
-# Load environment variables
-# Updated to use the .env that is inside the current folder
-# This update allows the user to put a different.env file for each lightrag folder
-load_dotenv(".env")
+# use the .env that is inside the current folder
+# allows to use different .env file for each lightrag instance
+# the OS environment variables take precedence over the .env file
+load_dotenv(dotenv_path=".env", override=False)
 
 # Initialize config parser
 config = configparser.ConfigParser()

lightrag/api/run_with_gunicorn.py

@@ -11,9 +11,10 @@ from lightrag.api.utils_api import parse_args, display_splash_screen, check_env_
 from lightrag.kg.shared_storage import initialize_share_data, finalize_share_data
 from dotenv import load_dotenv
 
-# Updated to use the .env that is inside the current folder
-# This update allows the user to put a different.env file for each lightrag folder
-load_dotenv(".env")
+# use the .env that is inside the current folder
+# allows to use different .env file for each lightrag instance
+# the OS environment variables take precedence over the .env file
+load_dotenv(dotenv_path=".env", override=False)
 
 
 def check_and_install_dependencies():

lightrag/api/utils_api.py

@@ -38,8 +38,10 @@ def check_env_file():
     return True
 
 
-# Load environment variables
-load_dotenv()
+# use the .env that is inside the current folder
+# allows to use different .env file for each lightrag instance
+# the OS environment variables take precedence over the .env file
+load_dotenv(dotenv_path=".env", override=False)
 
 global_args = {"main_args": None}