JToken Variation(string featureKey, JToken defaultValue)
{
FeatureFlagEvent featureFlagEvent = FeatureFlagEvent.Default(featureKey);
FeatureRequestEvent featureRequestEvent;
if (!Initialized())
{
Log.Warn("LaunchDarkly client has not yet been initialized. Returning default");
return(defaultValue);
}
if (User == null || User.Key == null)
{
Log.Warn("Feature flag evaluation called with null user or null user key. Returning default");
featureRequestEvent = eventFactory.NewDefaultFeatureRequestEvent(featureFlagEvent,
User,
defaultValue);
eventProcessor.SendEvent(featureRequestEvent);
return(defaultValue);
}
var flag = flagCacheManager.FlagForUser(featureKey, User);
if (flag != null)
{
featureFlagEvent = new FeatureFlagEvent(featureKey, flag);
var value = flag.value;
if (value == null)
{
featureRequestEvent = eventFactory.NewDefaultFeatureRequestEvent(featureFlagEvent,
User,
defaultValue);
value = defaultValue;
}
else
{
featureRequestEvent = eventFactory.NewFeatureRequestEvent(featureFlagEvent,
User,
flag.variation,
flag.value,
defaultValue);
}
eventProcessor.SendEvent(featureRequestEvent);
return(value);
}
Log.InfoFormat("Unknown feature flag {0}; returning default value",
featureKey);
featureRequestEvent = eventFactory.NewUnknownFeatureRequestEvent(featureKey,
User,
defaultValue);
eventProcessor.SendEvent(featureRequestEvent);
return(defaultValue);
}
EvaluationDetail <T> VariationInternal <T>(string featureKey, T defaultValue, ValueType <T> desiredType, EventFactory eventFactory)
{
FeatureFlagEvent featureFlagEvent = FeatureFlagEvent.Default(featureKey);
JToken defaultJson = desiredType.ValueToJson(defaultValue);
EvaluationDetail <T> errorResult(EvaluationErrorKind kind) =>
new EvaluationDetail <T>(defaultValue, null, new EvaluationReason.Error(kind));
var flag = flagCacheManager.FlagForUser(featureKey, User);
if (flag == null)
{
if (!Initialized)
{
Log.Warn("LaunchDarkly client has not yet been initialized. Returning default value");
SendEventIfOnline(eventFactory.NewUnknownFeatureRequestEvent(featureKey, User, defaultJson,
EvaluationErrorKind.CLIENT_NOT_READY));
return(errorResult(EvaluationErrorKind.CLIENT_NOT_READY));
}
else
{
Log.InfoFormat("Unknown feature flag {0}; returning default value", featureKey);
SendEventIfOnline(eventFactory.NewUnknownFeatureRequestEvent(featureKey, User, defaultJson,
EvaluationErrorKind.FLAG_NOT_FOUND));
return(errorResult(EvaluationErrorKind.FLAG_NOT_FOUND));
}
}
else
{
if (!Initialized)
{
Log.Warn("LaunchDarkly client has not yet been initialized. Returning cached value");
}
}
featureFlagEvent = new FeatureFlagEvent(featureKey, flag);
EvaluationDetail <T> result;
JToken valueJson;
if (flag.value == null || flag.value.Type == JTokenType.Null)
{
valueJson = defaultJson;
result = new EvaluationDetail <T>(defaultValue, flag.variation, flag.reason);
}
else
{
try
{
valueJson = flag.value;
var value = desiredType.ValueFromJson(flag.value);
result = new EvaluationDetail <T>(value, flag.variation, flag.reason);
}
catch (Exception)
{
valueJson = defaultJson;
result = new EvaluationDetail <T>(defaultValue, null, new EvaluationReason.Error(EvaluationErrorKind.WRONG_TYPE));
}
}
var featureEvent = eventFactory.NewFeatureRequestEvent(featureFlagEvent, User,
new EvaluationDetail <JToken>(valueJson, flag.variation, flag.reason), defaultJson);
SendEventIfOnline(featureEvent);
return(result);
}