Add log support for OpenAI demo

examples/lightrag_openai_demo.py

@@ -1,11 +1,76 @@
 import os
 import asyncio
+import logging
+import logging.config
 from lightrag import LightRAG, QueryParam
 from lightrag.llm.openai import gpt_4o_mini_complete, openai_embed
 from lightrag.kg.shared_storage import initialize_pipeline_status
+from lightrag.utils import logger, set_verbose_debug
 
 WORKING_DIR = "./dickens"
 
+def configure_logging():
+    """Configure logging for the application"""
+    
+    # Reset any existing handlers to ensure clean configuration
+    for logger_name in ["uvicorn", "uvicorn.access", "uvicorn.error", "lightrag"]:
+        logger_instance = logging.getLogger(logger_name)
+        logger_instance.handlers = []
+        logger_instance.filters = []
+
+    # Get log directory path from environment variable or use current directory
+    log_dir = os.getenv("LOG_DIR", os.getcwd())
+    log_file_path = os.path.abspath(os.path.join(log_dir, "lightrag_demo.log"))
+
+    print(f"\nLightRAG demo log file: {log_file_path}\n")
+    os.makedirs(os.path.dirname(log_dir), exist_ok=True)
+
+    # Get log file max size and backup count from environment variables
+    log_max_bytes = int(os.getenv("LOG_MAX_BYTES", 10485760))  # Default 10MB
+    log_backup_count = int(os.getenv("LOG_BACKUP_COUNT", 5))  # Default 5 backups
+
+    logging.config.dictConfig(
+        {
+            "version": 1,
+            "disable_existing_loggers": False,
+            "formatters": {
+                "default": {
+                    "format": "%(levelname)s: %(message)s",
+                },
+                "detailed": {
+                    "format": "%(asctime)s - %(name)s - %(levelname)s - %(message)s",
+                },
+            },
+            "handlers": {
+                "console": {
+                    "formatter": "default",
+                    "class": "logging.StreamHandler",
+                    "stream": "ext://sys.stderr",
+                },
+                "file": {
+                    "formatter": "detailed",
+                    "class": "logging.handlers.RotatingFileHandler",
+                    "filename": log_file_path,
+                    "maxBytes": log_max_bytes,
+                    "backupCount": log_backup_count,
+                    "encoding": "utf-8",
+                },
+            },
+            "loggers": {
+                "lightrag": {
+                    "handlers": ["console", "file"],
+                    "level": "INFO",
+                    "propagate": False,
+                },
+            },
+        }
+    )
+    
+    # Set the logger level to INFO
+    logger.setLevel(logging.INFO)
+    # Enable verbose debug if needed
+    set_verbose_debug(os.getenv("VERBOSE_DEBUG", "false").lower() == "true")
+
 if not os.path.exists(WORKING_DIR):
     os.mkdir(WORKING_DIR)
 
@@ -61,4 +126,6 @@ async def main():
 
 
 if __name__ == "__main__":
+    # Configure logging before running the main function
+    configure_logging()
     asyncio.run(main())