/// <summary>
/// Gets the feature variable value for given type.
/// </summary>
/// <param name="featureKey">The feature flag key</param>
/// <param name="variableKey">The variable key</param>
/// <param name="userId">The user ID</param>
/// <param name="userAttributes">The user's attributes</param>
/// <param name="variableType">Variable type</param>
/// <returns>string | null Feature variable value</returns>
public virtual T GetFeatureVariableValueForType <T>(string featureKey, string variableKey, string userId,
UserAttributes userAttributes, FeatureVariable.VariableType variableType)
{
var inputValues = new Dictionary <string, string>
{
{ USER_ID, userId },
{ FEATURE_KEY, featureKey },
{ VARIABLE_KEY, variableKey }
};
if (!ValidateStringInputs(inputValues))
{
return(default(T));
}
var featureFlag = Config.GetFeatureFlagFromKey(featureKey);
if (string.IsNullOrEmpty(featureFlag.Key))
{
return(default(T));
}
var featureVariable = featureFlag.GetFeatureVariableFromKey(variableKey);
if (featureVariable == null)
{
Logger.Log(LogLevel.ERROR,
$@"No feature variable was found for key ""{variableKey}"" in feature flag ""{featureKey}"".");
return(default(T));
}
else if (featureVariable.Type != variableType)
{
Logger.Log(LogLevel.ERROR,
$@"Variable is of type ""{featureVariable.Type}"", but you requested it as type ""{variableType}"".");
return(default(T));
}
var featureEnabled = false;
var variableValue = featureVariable.DefaultValue;
var decision = DecisionService.GetVariationForFeature(featureFlag, userId, userAttributes);
if (decision.Variation != null)
{
var variation = decision.Variation;
featureEnabled = variation.FeatureEnabled.GetValueOrDefault();
var featureVariableUsageInstance = variation.GetFeatureVariableUsageFromId(featureVariable.Id);
if (featureVariableUsageInstance != null)
{
if (variation.FeatureEnabled == true)
{
variableValue = featureVariableUsageInstance.Value;
Logger.Log(LogLevel.INFO, $@"Returning variable value ""{variableValue}"" for variation ""{variation.Key}"" of feature flag ""{featureKey}"".");
}
else
{
Logger.Log(LogLevel.INFO, $@"Feature ""{featureKey}"" is not enabled for user {userId}. Returning default value for variable ""{variableKey}"".");
}
}
else
{
Logger.Log(LogLevel.INFO, $@"Variable ""{variableKey}"" is not used in variation ""{variation.Key}"", returning default value ""{variableValue}"".");
}
}
else
{
Logger.Log(LogLevel.INFO,
$@"User ""{userId}"" is not in any variation for feature flag ""{featureKey}"", returning default value ""{variableValue}"".");
}
var sourceInfo = new Dictionary <string, string>();
if (decision?.Source == FeatureDecision.DECISION_SOURCE_FEATURE_TEST)
{
sourceInfo["experimentKey"] = decision.Experiment.Key;
sourceInfo["variationKey"] = decision.Variation.Key;
}
var typeCastedValue = GetTypeCastedVariableValue(variableValue, variableType);
var decisionInfo = new Dictionary <string, object>
{
{ "featureKey", featureKey },
{ "featureEnabled", featureEnabled },
{ "variableKey", variableKey },
{ "variableValue", typeCastedValue },
{ "variableType", variableType.ToString().ToLower() },
{ "source", decision?.Source },
{ "sourceInfo", sourceInfo },
};
NotificationCenter.SendNotifications(NotificationCenter.NotificationType.Decision, DecisionNotificationTypes.FEATURE_VARIABLE, userId,
userAttributes ?? new UserAttributes(), decisionInfo);
return((T)typeCastedValue);
}
