[Logger] Fix multiple logs (#53)

Author: TomerShor

nuclio_sdk/logger.py

@@ -58,26 +58,25 @@ def __init__(self, level, name="nuclio_sdk"):
         self._logger = logging.getLogger(name)
         self._logger.setLevel(level)
         self._bound_variables = {}
-        self._handlers = {}
 
     def set_handler(self, handler_name, file, formatter):
 
         # check if there's a handler by this name
-        if handler_name in self._handlers:
-            self._logger.removeHandler(self._handlers[handler_name])
+        for handler in self._logger.handlers:
+            if handler.name == handler_name:
+                self._logger.removeHandler(handler)
+                break
 
         # create a stream handler from the file
         stream_handler = logging.StreamHandler(file)
+        stream_handler.name = handler_name
 
         # set the formatter
         stream_handler.setFormatter(formatter)
 
         # add the handler to the logger
         self._logger.addHandler(stream_handler)
 
-        # save as the named output
-        self._handlers[handler_name] = stream_handler
-
     def debug(self, message, *args):
         self._update_bound_vars_and_log(logging.DEBUG, message, *args)
 

nuclio_sdk/test/test_logger.py

@@ -110,3 +110,21 @@ def __log__(self):
             '"with": {"some_instance": "Unable to serialize object: I am not a string"}',
             self._io.getvalue(),
         )
+
+    def test_redundant_logger_creation(self):
+
+        # create 3 loggers with the same name
+        logger1 = nuclio_sdk.Logger(logging.DEBUG, "test-logger")
+        logger1.set_handler("default", self._io, nuclio_sdk.logger.JSONFormatter())
+        logger2 = nuclio_sdk.Logger(logging.DEBUG, "test-logger")
+        logger2.set_handler("default", self._io, nuclio_sdk.logger.JSONFormatter())
+        logger3 = nuclio_sdk.Logger(logging.DEBUG, "test-logger")
+        logger3.set_handler("default", self._io, nuclio_sdk.logger.JSONFormatter())
+
+        # log from each logger and make sure only one log line is printed
+        logger1.info("1")
+        assert self._io.getvalue().count('"level": "info", "message": "1"') == 1
+        logger2.info("2")
+        assert self._io.getvalue().count('"level": "info", "message": "2"') == 1
+        logger3.info("3")
+        assert self._io.getvalue().count('"level": "info", "message": "3"') == 1