Agent: Add telemetry json encoder

Telemetry json encoder is needed to encode OperatingSystems enums when sending back telemetries

monkey/infection_monkey/telemetry/base_telem.py

@@ -4,6 +4,7 @@ import logging
 
 from infection_monkey.control import ControlClient
 from infection_monkey.telemetry.i_telem import ITelem
+from infection_monkey.telemetry.telem_encoder import TelemetryJSONEncoder
 
 logger = logging.getLogger(__name__)
 LOGGED_DATA_LENGTH = 300  # How many characters of telemetry data will be logged
@@ -39,7 +40,7 @@ class BaseTelem(ITelem, metaclass=abc.ABCMeta):
 
     @property
     def json_encoder(self):
-        return json.JSONEncoder
+        return TelemetryJSONEncoder
 
     def _log_telem_sending(self, serialized_data: str, log_data=True):
         logger.debug(f"Sending {self.telem_category} telemetry.")

monkey/infection_monkey/telemetry/telem_encoder.py

@@ -0,0 +1,10 @@
+import json
+
+from common import OperatingSystems
+
+
+class TelemetryJSONEncoder(json.JSONEncoder):
+    def default(self, obj):
+        if isinstance(obj, OperatingSystems):
+            return obj.name
+        return json.JSONEncoder.default(self, obj)