add log message if stored variation is no longer in datafile

Author: wangjoshuah

OptimizelySDKCore/OptimizelySDKCore/OPTLYLoggerMessages.h

@@ -122,6 +122,8 @@ extern NSString *const OPTLYLoggerMessagesDataStoreDatabaseGetNumberEventsTVOSWa
 extern NSString *const OPTLYLoggerMessagesDataStoreDatabaseRemoveTVOSWarning;
 
 // ---- User Profile ----
+// warning
+extern NSString *const OPTLYLoggerMessagesUserProfileVariationNoLongerInDatafile;
 // Debug
 extern NSString *const OPTLYLoggerMessagesUserProfileVariation;
 extern NSString *const OPTLYLoggerMessagesUserProfileNoVariation;

OptimizelySDKCore/OptimizelySDKCore/OPTLYLoggerMessages.m

@@ -122,6 +122,8 @@
 NSString *const OPTLYLoggerMessagesDataStoreDatabaseRemoveTVOSWarning = @"[DATABASE] tvOS can only remove data from cache> Number of events: %ld, eventType: %ld.";
 
 // ---- User Profile ----
+//warning
+NSString *const OPTLYLoggerMessagesUserProfileVariationNoLongerInDatafile = @"Variation %@ for experiment %@ no longer found in datafile.";
 // Debug
 NSString *const OPTLYLoggerMessagesUserProfileVariation = @"Variation %@ for user %@, experiment %@ found.";
 NSString *const OPTLYLoggerMessagesUserProfileNoVariation = @"Variation for user %@, experiment %@ not found.";

OptimizelySDKCore/OptimizelySDKCore/Optimizely.m

@@ -150,6 +150,11 @@ - (OPTLYVariation *)getVariationForExperiment:(NSString *)experimentKey
             if (storedVariation != nil) {
                 return storedVariation;
             }
+            else { // stored variation is no longer in datafile
+                [self.userProfile removeUser:userId experiment:experimentKey];
+                [self.logger logMessage:[NSString stringWithFormat:OPTLYLoggerMessagesUserProfileVariationNoLongerInDatafile, storedVariationKey, experimentKey]
+                              withLevel:OptimizelyLogLevelWarning];
+            }
         }
     }
     OPTLYVariation *bucketedVariation = nil;