feat: support user-defined configuration of log file size and retention count (#9610)

api/.env.example

@@ -309,6 +309,10 @@ RESPECT_XFORWARD_HEADERS_ENABLED=false
 
 # Log file path
 LOG_FILE=
+# Log file max size, the unit is MB
+LOG_FILE_MAX_SIZE=20
+# Log file max backup count
+LOG_FILE_BACKUP_COUNT=5
 
 # Indexing configuration
 INDEXING_MAX_SEGMENTATION_TOKENS_LENGTH=1000

api/configs/feature/__init__.py

@@ -319,6 +319,16 @@ class LoggingConfig(BaseSettings):
         default=None,
     )
 
+    LOG_FILE_MAX_SIZE: PositiveInt = Field(
+        description="Maximum file size for file rotation retention, the unit is megabytes (MB)",
+        default=20,
+    )
+
+    LOG_FILE_BACKUP_COUNT: PositiveInt = Field(
+        description="Maximum file backup count file rotation retention",
+        default=5,
+    )
+
     LOG_FORMAT: str = Field(
         description="Format string for log messages",
         default="%(asctime)s.%(msecs)03d %(levelname)s [%(threadName)s] [%(filename)s:%(lineno)d] - %(message)s",

api/extensions/ext_logging.py

@@ -17,8 +17,8 @@ def init_app(app: Flask):
         log_handlers = [
             RotatingFileHandler(
                 filename=log_file,
-                maxBytes=1024 * 1024 * 1024,
-                backupCount=5,
+                maxBytes=dify_config.LOG_FILE_MAX_SIZE * 1024 * 1024,
+                backupCount=dify_config.LOG_FILE_BACKUP_COUNT,
             ),
             logging.StreamHandler(sys.stdout),
         ]