Feature flag & rollout parsing (#205)

* Feature flag & rollout parsing

* New Models added

* variation variable usage mapping

* Feature variable and its usage parsing

* demoTestDatafile version upgraded to 4 and maintain compatibility to v3

* Test cases added for new models

* get back to Asynchronous Initialization of OPTLYManager

* CR updated

* Removed xcode analyze warnings & code covered for OPTLYVariation.h

* warnings removed for variable nullability

* added test cases for [OPTLYVariation getVariableUsageForVariableId]

Author: arafay-folio3

OptimizelyDemoApp/AppDelegate.swift

@@ -186,7 +186,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
                     variationViewController.eventKey = self.eventKey
                     variationViewController.optimizelyClient = optimizelyClient
                     variationViewController.userId = self.userId
-                    variationViewController.variationKey = (bucketedVariation!.variationKey)!
+                    variationViewController.variationKey = bucketedVariation!.variationKey
                     rootViewController = variationViewController
                 }
             }

OptimizelyDemoApp/demoTestDatafile.json

@@ -1 +1 @@
-{"groups":[],"experiments":[{"status":"Running","key":"background_experiment","layerId":"8174477208","trafficAllocation":[{"entityId":"8182320831","endOfRange":5000},{"entityId":"8177401270","endOfRange":10000}],"audienceIds":["8179612088"],"variations":[{"variables":[],"id":"8182320831","key":"variation_a"},{"variables":[],"id":"8177401270","key":"variation_b"}],"forcedVariations":{},"id":"8183190141"}],"audiences":[{"conditions":"[\"and\", [\"or\", [\"or\", {\"name\": \"sample_attribute_key\", \"type\": \"custom_attribute\", \"value\": \"sample_attribute_value\"}]]]","id":"8179612088","name":"sample_audience"}],"anonymizeIP":false,"accountId":"6384711706","projectId":"8182362857","version":"3","attributes":[{"id":"8172478122","key":"sample_attribute_key"}],"events":[{"experimentIds":["8183190141"],"id":"8182211634","key":"sample_conversion"}],"revision":"13"}
+{"groups":[],"experiments":[{"status":"Running","key":"background_experiment","layerId":"8174477208","trafficAllocation":[{"entityId":"8182320831","endOfRange":5000},{"entityId":"8177401270","endOfRange":10000}],"audienceIds":["8179612088"],"variations":[{"variables":[],"id":"8182320831","key":"variation_a"},{"variables":[],"id":"8177401270","key":"variation_b"}],"forcedVariations":{},"id":"8183190141"}],"audiences":[{"conditions":"[\"and\", [\"or\", [\"or\", {\"name\": \"sample_attribute_key\", \"type\": \"custom_attribute\", \"value\": \"sample_attribute_value\"}]]]","id":"8179612088","name":"sample_audience"}],"anonymizeIP":false,"accountId":"6384711706","projectId":"8182362857","version":"4","attributes":[{"id":"8172478122","key":"sample_attribute_key"}],"events":[{"experimentIds":["8183190141"],"id":"8182211634","key":"sample_conversion"}],"revision":"13","featureFlags":[{"id":"4195505407","key":"boolean_feature","rolloutId":"","experimentIds":[],"variables":[]},{"id":"3926744821","key":"double_single_variable_feature","rolloutId":"","experimentIds":["2201520193"],"variables":[{"id":"4111654444","key":"double_variable","type":"double","defaultValue":"14.99"}]},{"id":"3281420120","key":"integer_single_variable_feature","rolloutId":"2048875663","experimentIds":[],"variables":[{"id":"593964691","key":"integer_variable","type":"integer","defaultValue":"7"}]},{"id":"2591051011","key":"boolean_single_variable_feature","rolloutId":"","experimentIds":[],"variables":[{"id":"3974680341","key":"boolean_variable","type":"boolean","defaultValue":"true"}]},{"id":"2079378557","key":"string_single_variable_feature","rolloutId":"1058508303","experimentIds":[],"variables":[{"id":"2077511132","key":"string_variable","type":"string","defaultValue":"wingardium leviosa"}]},{"id":"3263342226","key":"multi_variate_feature","rolloutId":"813411034","experimentIds":["3262035800"],"variables":[{"id":"675244127","key":"first_letter","type":"string","defaultValue":"H"},{"id":"4052219963","key":"rest_of_name","type":"string","defaultValue":"arry"}]},{"id":"3263342226","key":"mutex_group_feature","rolloutId":"","experimentIds":["4138322202","1786133852"],"variables":[{"id":"2059187672","key":"correlating_variation_name","type":"string","defaultValue":"null"}]}],"rollouts":[{"id":"1058508303","experiments":[{"id":"1785077004","key":"1785077004","status":"Running","layerId":"1058508303","audienceIds":[],"forcedVariations":{},"variations":[{"id":"1566407342","key":"1566407342","variables":[{"id":"2077511132","value":"lumos"}]}],"trafficAllocation":[{"entityId":"1566407342","endOfRange":5000}]}]},{"id":"813411034","experiments":[{"id":"3421010877","key":"3421010877","status":"Running","layerId":"813411034","audienceIds":["3468206642"],"forcedVariations":{},"variations":[{"id":"521740985","key":"521740985","variables":[{"id":"675244127","value":"G"},{"id":"4052219963","value":"odric"}]}],"trafficAllocation":[{"entityId":"521740985","endOfRange":5000}]},{"id":"600050626","key":"600050626","status":"Running","layerId":"813411034","audienceIds":["3988293898"],"forcedVariations":{},"variations":[{"id":"180042646","key":"180042646","variables":[{"id":"675244127","value":"S"},{"id":"4052219963","value":"alazar"}]}],"trafficAllocation":[{"entityId":"180042646","endOfRange":5000}]},{"id":"2637642575","key":"2637642575","status":"Running","layerId":"813411034","audienceIds":["4194404272"],"forcedVariations":{},"variations":[{"id":"2346257680","key":"2346257680","variables":[{"id":"675244127","value":"D"},{"id":"4052219963","value":"udley"}]}],"trafficAllocation":[{"entityId":"2346257680","endOfRange":5000}]},{"id":"828245624","key":"828245624","status":"Running","layerId":"813411034","audienceIds":[],"forcedVariations":{},"variations":[{"id":"3137445031","key":"3137445031","variables":[{"id":"675244127","value":"M"},{"id":"4052219963","value":"uggle"}]}],"trafficAllocation":[{"entityId":"3137445031","endOfRange":5000}]}]},{"id":"2048875663","experiments":[{"id":"3794675122","key":"3794675122","status":"Running","layerId":"2048875663","audienceIds":[],"forcedVariations":{},"variations":[{"id":"589640735","key":"589640735","variables":[]}],"trafficAllocation":[{"entityId":"589640735","endOfRange":10000}]}]}]}