chore: Edit logger.error calls (#1019)

* Edit logger.errors that don't need to be called as errors to warning or debug

azure-iot-device/azure/iot/device/common/handle_exceptions.py

@@ -25,8 +25,8 @@ def handle_background_exception(e):
 
     # @FUTURE: We should add a mechanism which allows applications to receive these
     # exceptions so they can respond accordingly
-    logger.error(msg="Exception caught in background thread.  Unable to handle.")
-    logger.error(traceback.format_exception_only(type(e), e))
+    logger.warning(msg="Exception caught in background thread.  Unable to handle.")
+    logger.warning(traceback.format_exception_only(type(e), e))
 
 
 def swallow_unraised_exception(e, log_msg=None, log_lvl="warning"):

azure-iot-device/azure/iot/device/common/mqtt_transport.py

@@ -182,20 +182,22 @@ def on_connect(client, userdata, flags, rc):
                             _create_error_from_connack_rc_code(rc)
                         )
                     except Exception:
-                        logger.error("Unexpected error calling on_mqtt_connection_failure_handler")
-                        logger.error(traceback.format_exc())
+                        logger.warning(
+                            "Unexpected error calling on_mqtt_connection_failure_handler"
+                        )
+                        logger.warning(traceback.format_exc())
                 else:
-                    logger.error(
+                    logger.warning(
                         "connection failed, but no on_mqtt_connection_failure_handler handler callback provided"
                     )
             elif this.on_mqtt_connected_handler:
                 try:
                     this.on_mqtt_connected_handler()
                 except Exception:
-                    logger.error("Unexpected error calling on_mqtt_connected_handler")
-                    logger.error(traceback.format_exc())
+                    logger.warning("Unexpected error calling on_mqtt_connected_handler")
+                    logger.warning(traceback.format_exc())
             else:
-                logger.error("No event handler callback set for on_mqtt_connected_handler")
+                logger.debug("No event handler callback set for on_mqtt_connected_handler")
 
         def on_disconnect(client, userdata, rc):
             this = self_weakref()
@@ -220,10 +222,10 @@ def on_disconnect(client, userdata, rc):
                     try:
                         this.on_mqtt_disconnected_handler(cause)
                     except Exception:
-                        logger.error("Unexpected error calling on_mqtt_disconnected_handler")
-                        logger.error(traceback.format_exc())
+                        logger.warning("Unexpected error calling on_mqtt_disconnected_handler")
+                        logger.warning(traceback.format_exc())
                 else:
-                    logger.error("No event handler callback set for on_mqtt_disconnected_handler")
+                    logger.warning("No event handler callback set for on_mqtt_disconnected_handler")
 
         def on_subscribe(client, userdata, mid, granted_qos):
             this = self_weakref()
@@ -254,10 +256,10 @@ def on_message(client, userdata, mqtt_message):
                 try:
                     this.on_mqtt_message_received_handler(mqtt_message.topic, mqtt_message.payload)
                 except Exception:
-                    logger.error("Unexpected error calling on_mqtt_message_received_handler")
-                    logger.error(traceback.format_exc())
+                    logger.warning("Unexpected error calling on_mqtt_message_received_handler")
+                    logger.warning(traceback.format_exc())
             else:
-                logger.error(
+                logger.debug(
                     "No event handler callback set for on_mqtt_message_received_handler - DROPPING MESSAGE"
                 )
 
@@ -601,8 +603,8 @@ def establish_operation(self, mid, callback=None):
                 try:
                     callback()
                 except Exception:
-                    logger.error("Unexpected error calling callback for MID: {}".format(mid))
-                    logger.error(traceback.format_exc())
+                    logger.debug("Unexpected error calling callback for MID: {}".format(mid))
+                    logger.debug(traceback.format_exc())
             else:
                 # Not entirely unexpected because of QOS=1
                 logger.debug("No callback for MID: {}".format(mid))
@@ -644,8 +646,8 @@ def complete_operation(self, mid):
                 try:
                     callback()
                 except Exception:
-                    logger.error("Unexpected error calling callback for MID: {}".format(mid))
-                    logger.error(traceback.format_exc())
+                    logger.debug("Unexpected error calling callback for MID: {}".format(mid))
+                    logger.debug(traceback.format_exc())
             else:
                 # fully expected.  QOS=1 means we might get 2 PUBACKs
                 logger.debug("No callback set for MID: {}".format(mid))
@@ -674,7 +676,7 @@ def cancel_all_operations(self):
                 try:
                     callback(cancelled=True)
                 except Exception:
-                    logger.error("Unexpected error calling callback for MID: {}".format(mid))
-                    logger.error(traceback.format_exc())
+                    logger.debug("Unexpected error calling callback for MID: {}".format(mid))
+                    logger.debug(traceback.format_exc())
             else:
                 logger.debug("Cancelling {} - No callback set for MID".format(mid))

azure-iot-device/azure/iot/device/common/pipeline/pipeline_stages_base.py

@@ -149,16 +149,16 @@ def handle_pipeline_event(self, event):
         except Exception as e:
             # Do not use exc_info parameter on logger.* calls. This causes pytest to save the
             # traceback which saves stack frames which shows up as a leak
-            logger.error(
+            logger.warning(
                 msg="{}: Unexpected error in ._handle_pipeline_event() call: {}".format(self, e)
             )
             if self.previous:
-                logger.error("{}: Raising background exception")
+                logger.warning("{}: Raising background exception")
                 self.report_background_exception(e)
             else:
                 # Nothing else we can do but log this. There exists no stage we can send the
                 # exception to, and raising would send the error back down the pipeline.
-                logger.error(
+                logger.warning(
                     "{}: Cannot report a background exception because there is no previous stage!"
                 )
 
@@ -187,7 +187,7 @@ def send_op_down(self, op):
             self.next.run_op(op)
         else:
             # This shouldn't happen if the pipeline was created correctly
-            logger.error(
+            logger.warning(
                 "{}({}): no next stage.cannot send op down. completing with error".format(
                     self.name, op.name
                 )
@@ -344,7 +344,7 @@ def _handle_pipeline_event(self, event):
                 )
             else:
                 # unexpected condition: we should be handling all pipeline events
-                logger.error("incoming {} event with no handler.  dropping.".format(event.name))
+                logger.debug("incoming {} event with no handler.  dropping.".format(event.name))
 
 
 # NOTE: This stage could be a candidate for being refactored into some kind of other

azure-iot-device/azure/iot/device/iothub/pipeline/mqtt_pipeline.py

@@ -121,28 +121,28 @@ def _on_pipeline_event(event):
                 if self.on_c2d_message_received:
                     self.on_c2d_message_received(event.message)
                 else:
-                    logger.error("C2D message event received with no handler.  dropping.")
+                    logger.debug("C2D message event received with no handler.  dropping.")
 
             elif isinstance(event, pipeline_events_iothub.InputMessageEvent):
                 if self.on_input_message_received:
                     self.on_input_message_received(event.message)
                 else:
-                    logger.error("input message event received with no handler.  dropping.")
+                    logger.debug("input message event received with no handler.  dropping.")
 
             elif isinstance(event, pipeline_events_iothub.MethodRequestEvent):
                 if self.on_method_request_received:
                     self.on_method_request_received(event.method_request)
                 else:
-                    logger.error("Method request event received with no handler. Dropping.")
+                    logger.debug("Method request event received with no handler. Dropping.")
 
             elif isinstance(event, pipeline_events_iothub.TwinDesiredPropertiesPatchEvent):
                 if self.on_twin_patch_received:
                     self.on_twin_patch_received(event.patch)
                 else:
-                    logger.error("Twin patch event received with no handler. Dropping.")
+                    logger.debug("Twin patch event received with no handler. Dropping.")
 
             else:
-                logger.error("Dropping unknown pipeline event {}".format(event.name))
+                logger.debug("Dropping unknown pipeline event {}".format(event.name))
 
         def _on_connected():
             if self.on_connected:
@@ -515,7 +515,9 @@ def enable_feature(self, feature_name, callback):
 
         def on_complete(op, error):
             if error:
-                logger.error("Subscribe for {} failed.  Not enabling feature".format(feature_name))
+                logger.warning(
+                    "Subscribe for {} failed.  Not enabling feature".format(feature_name)
+                )
             else:
                 self.feature_enabled[feature_name] = True
             callback(error=error)

azure-iot-device/azure/iot/device/iothub/pipeline/pipeline_stages_iothub_mqtt.py

@@ -168,7 +168,7 @@ def _get_feature_subscription_topic(self, feature):
         elif feature == pipeline_constant.TWIN_PATCHES:
             return mqtt_topic_iothub.get_twin_patch_topic_for_subscribe()
         else:
-            logger.error("Cannot retrieve MQTT topic for subscription to invalid feature")
+            logger.warning("Cannot retrieve MQTT topic for subscription to invalid feature")
             raise pipeline_exceptions.OperationError(
                 "Trying to enable/disable invalid feature - {}".format(feature)
             )

azure-iot-device/azure/iot/device/provisioning/pipeline/mqtt_pipeline.py

@@ -104,7 +104,7 @@ def __init__(self, pipeline_configuration):
 
         def _on_pipeline_event(event):
             # error because no events should
-            logger.error("Dropping unknown pipeline event {}".format(event.name))
+            logger.debug("Dropping unknown pipeline event {}".format(event.name))
 
         def _on_connected():
             if self.on_connected: