Logging to file for action server

rasa_sdk/__main__.py

@@ -2,13 +2,14 @@
 
 from rasa_sdk import utils
 from rasa_sdk.endpoint import create_argument_parser, run
+from rasa_sdk.constants import APPLICATION_ROOT_LOGGER_NAME
 
 
 def main_from_args(args):
-    logging.basicConfig(level=logging.DEBUG)
     logging.getLogger("matplotlib").setLevel(logging.WARN)
 
     utils.configure_colored_logging(args.loglevel)
+    utils.configure_file_logging(logging.getLogger(APPLICATION_ROOT_LOGGER_NAME), args.log_file, args.loglevel)
     utils.update_sanic_log_level()
 
     run(

rasa_sdk/constants.py

@@ -3,3 +3,4 @@
 ENV_SANIC_WORKERS = "ACTION_SERVER_SANIC_WORKERS"
 DEFAULT_LOG_LEVEL_LIBRARIES = "ERROR"
 ENV_LOG_LEVEL_LIBRARIES = "LOG_LEVEL_LIBRARIES"
+APPLICATION_ROOT_LOGGER_NAME = "rasa_sdk"

rasa_sdk/endpoint.py

@@ -52,7 +52,8 @@ def create_argument_parser():
 
     parser = argparse.ArgumentParser(description="starts the action endpoint")
     add_endpoint_arguments(parser)
-    utils.add_logging_option_arguments(parser)
+    utils.add_logging_level_option_arguments(parser)
+    utils.add_logging_file_arguments(parser)
     return parser
 
 

rasa_sdk/utils.py

@@ -40,7 +40,7 @@ def all_subclasses(cls: Any) -> List[Any]:
     ]
 
 
-def add_logging_option_arguments(parser):
+def add_logging_level_option_arguments(parser):
     """Add options to an argument parser to configure logging levels."""
 
     # arguments for logging configuration
@@ -70,6 +70,15 @@ def add_logging_option_arguments(parser):
     )
 
 
+def add_logging_file_arguments(parser):
+    parser.add_argument(
+        "--log-file",
+        type=str,
+        default=None,
+        help="Store logs in specified file.",
+    )
+
+
 def configure_colored_logging(loglevel):
     import coloredlogs
 
@@ -86,6 +95,27 @@ def configure_colored_logging(loglevel):
     )
 
 
+def configure_file_logging(logger_obj: logging.Logger, log_file: Optional[Text], loglevel: int) -> None:
+    """Configure logging to a file.
+
+    Args:
+        :param logger_obj: Logger object to configure.
+        :param log_file: Path of log file to write to.
+        :param loglevel:
+    """
+    if not log_file:
+        return
+
+    if not loglevel:
+        loglevel = logging.INFO
+
+    formatter = logging.Formatter("%(asctime)s [%(levelname)-5.5s]  %(name)s  -  %(message)s")
+    file_handler = logging.FileHandler(log_file, encoding="utf-8")
+    file_handler.setLevel(loglevel)
+    file_handler.setFormatter(formatter)
+    logger_obj.addHandler(file_handler)
+
+
 def arguments_of(func) -> AbstractSet[Text]:
     """Return the parameters of the function `func` as a list of their names."""