make event stdout encoding more resilient to UTF-16 surrogate pairs

see: https://en.wikipedia.org/wiki/Universal_Character_Set_characters#Surrogates

awx/api/renderers.py

@@ -7,6 +7,24 @@ from prometheus_client.parser import text_string_to_metric_families
 # Django REST Framework
 from rest_framework import renderers
 from rest_framework.request import override_method
+from rest_framework.utils import encoders
+
+
+class SurrogateEncoder(encoders.JSONEncoder):
+
+    def encode(self, obj):
+        ret = super(SurrogateEncoder, self).encode(obj)
+        try:
+            ret.encode()
+        except UnicodeEncodeError as e:
+            if 'surrogates not allowed' in e.reason:
+                ret = ret.encode('utf-8', 'replace').decode()
+        return ret
+
+
+class DefaultJSONRenderer(renderers.JSONRenderer):
+
+    encoder_class = SurrogateEncoder
 
 
 class BrowsableAPIRenderer(renderers.BrowsableAPIRenderer):

awx/settings/defaults.py

@@ -310,7 +310,7 @@ REST_FRAMEWORK = {
         'awx.api.parsers.JSONParser',
     ),
     'DEFAULT_RENDERER_CLASSES': (
-        'rest_framework.renderers.JSONRenderer',
+        'awx.api.renderers.DefaultJSONRenderer',
         'awx.api.renderers.BrowsableAPIRenderer',
     ),
     'DEFAULT_METADATA_CLASS': 'awx.api.metadata.Metadata',