// Checks prerequisites if any; returns null if successful, or an EvaluationReason if we have to
// short-circuit due to a prerequisite failure.
private EvaluationReason CheckPrerequisites(User user, IFeatureStore featureStore, IList <FeatureRequestEvent> events,
EventFactory eventFactory)
{
if (Prerequisites == null || Prerequisites.Count == 0)
{
return(null);
}
foreach (var prereq in Prerequisites)
{
var prereqOk = true;
var prereqFeatureFlag = featureStore.Get(VersionedDataKind.Features, prereq.Key);
if (prereqFeatureFlag == null)
{
Log.ErrorFormat("Could not retrieve prerequisite flag \"{0}\" when evaluating \"{1}\"",
prereq.Key, Key);
prereqOk = false;
}
else
{
var prereqEvalResult = prereqFeatureFlag.Evaluate(user, featureStore, events, eventFactory);
// Note that if the prerequisite flag is off, we don't consider it a match no matter
// what its off variation was. But we still need to evaluate it in order to generate
// an event.
if (!prereqFeatureFlag.On || prereqEvalResult.VariationIndex == null || prereqEvalResult.VariationIndex.Value != prereq.Variation)
{
prereqOk = false;
}
events.Add(eventFactory.NewPrerequisiteFeatureRequestEvent(prereqFeatureFlag, user,
prereqEvalResult, this));
}
if (!prereqOk)
{
return(EvaluationReason.PrerequisiteFailedReason(prereq.Key));
}
}
return(null);
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
LdValue o = (LdValue)LdValueSerializer.Instance.ReadJson(reader, typeof(LdValue), LdValue.Null, serializer);
if (o.IsNull)
{
return(null);
}
EvaluationReasonKind kind = (EvaluationReasonKind)Enum.Parse(typeof(EvaluationReasonKind), o.Get("kind").AsString);
switch (kind)
{
case EvaluationReasonKind.OFF:
return(EvaluationReason.OffReason);
case EvaluationReasonKind.FALLTHROUGH:
return(EvaluationReason.FallthroughReason);
case EvaluationReasonKind.TARGET_MATCH:
return(EvaluationReason.TargetMatchReason);
case EvaluationReasonKind.RULE_MATCH:
var index = o.Get("ruleIndex").AsInt;
var id = o.Get("ruleId").AsString;
return(EvaluationReason.RuleMatchReason(index, id));
case EvaluationReasonKind.PREREQUISITE_FAILED:
var key = o.Get("prerequisiteKey").AsString;
return(EvaluationReason.PrerequisiteFailedReason(key));
case EvaluationReasonKind.ERROR:
var errorKind = (EvaluationErrorKind)Enum.Parse(typeof(EvaluationErrorKind), o.Get("errorKind").AsString);
return(EvaluationReason.ErrorReason(errorKind));
}
throw new ArgumentException();
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
JObject o = serializer.Deserialize <JObject>(reader);
if (o == null)
{
return(null);
}
EvaluationReasonKind kind = o.GetValue("kind").ToObject <EvaluationReasonKind>();
switch (kind)
{
case EvaluationReasonKind.OFF:
return(EvaluationReason.OffReason);
case EvaluationReasonKind.FALLTHROUGH:
return(EvaluationReason.FallthroughReason);
case EvaluationReasonKind.TARGET_MATCH:
return(EvaluationReason.TargetMatchReason);
case EvaluationReasonKind.RULE_MATCH:
var index = (int)o.GetValue("ruleIndex");
var id = (string)o.GetValue("ruleId");
return(EvaluationReason.RuleMatchReason(index, id));
case EvaluationReasonKind.PREREQUISITE_FAILED:
var key = (string)o.GetValue("prerequisiteKey");
return(EvaluationReason.PrerequisiteFailedReason(key));
case EvaluationReasonKind.ERROR:
var errorKind = o.GetValue("errorKind").ToObject <EvaluationErrorKind>();
return(EvaluationReason.ErrorReason(errorKind));
}
throw new ArgumentException();
}