Add handling of empty JSON return values

 - Will now throw a CRITICAL

check_http_json.py

@@ -346,6 +346,8 @@ def checkWarning(self):
 
     def checkCritical(self):
         failure = ''
+        if not self.data:
+            failure = " Empty JSON data."
         if self.key_threshold_critical is not None:
             failure += self.checkThresholds(self.key_threshold_critical)
         if self.key_value_list_critical is not None:

test/test_check_http_json.py

@@ -256,7 +256,7 @@ def test_array_with_missing_element(self):
 
         # This should not throw a KeyError
         data = '{}'
-        self.check_data(rules.dash_q(['(0).Node,foobar', '(1).Node,missing']), data, WARNING_CODE)
+        self.check_data(rules.dash_q(['(0).Node,foobar', '(1).Node,missing']), data, CRITICAL_CODE)
 
     def test_subelem(self):
 
@@ -274,3 +274,23 @@ def test_subarrayelem_missing_elem(self):
         self.check_data(rules.dash_E(['(*).capacity.value.too_deep']), data, CRITICAL_CODE)
         # Should not throw keyerror
         self.check_data(rules.dash_E(['foo']), data, CRITICAL_CODE)
+
+
+    def test_empty_key_value_array(self):
+        """
+        https://github.com/drewkerrigan/nagios-http-json/issues/61
+        """
+
+        rules = RulesHelper()
+
+        # This should simply work
+        data = '[{"update_status": "finished"},{"update_status": "finished"}]'
+        self.check_data(rules.dash_q(['(*).update_status,finished']), data, OK_CODE)
+
+        # This should warn us
+        data = '[{"update_status": "finished"},{"update_status": "failure"}]'
+        self.check_data(rules.dash_q(['(*).update_status,finished']), data, WARNING_CODE)
+
+        # This should throw an error
+        data = '[]'
+        self.check_data(rules.dash_q(['(*).update_status,warn_me']), data, CRITICAL_CODE)

test/test_main.py

@@ -12,7 +12,7 @@
 
 
 class MockResponse():
-    def __init__(self, status_code=200, content='{}'):
+    def __init__(self, status_code=200, content='{"foo": "bar"}'):
         self.status_code = status_code
         self.content = content