add config version to metadata (#259)

Author: kat-statsig

evaluator.go

@@ -28,6 +28,7 @@ type evalResult struct {
 	DerivedDeviceMetadata         *DerivedDeviceMetadata `json:"derived_device_metadata,omitempty"`
 	ForwardAllExposures           bool                   `json:"forward_all_exposures,omitempty"`
 	SamplingRate                  *int                   `json:"sampling_rate,omitempty"`
+	ConfigVersion                 *int                   `json:"config_version,omitempty"`
 }
 
 type DerivedDeviceMetadata struct {
@@ -401,6 +402,7 @@ func (e *evaluator) eval(user User, spec configSpec, depth int, context *evalCon
 						EvaluationDetails:             evalDetails,
 						DerivedDeviceMetadata:         deviceMetadata,
 						SamplingRate:                  rule.SamplingRate,
+						ConfigVersion:                 spec.ConfigVersion,
 					}
 					if rule.IsExperimentGroup != nil {
 						result.IsExperimentGroup = rule.IsExperimentGroup
@@ -415,6 +417,7 @@ func (e *evaluator) eval(user User, spec configSpec, depth int, context *evalCon
 						EvaluationDetails:     evalDetails,
 						DerivedDeviceMetadata: deviceMetadata,
 						SamplingRate:          rule.SamplingRate,
+						ConfigVersion:         spec.ConfigVersion,
 					}
 				}
 			}
@@ -432,9 +435,10 @@ func (e *evaluator) eval(user User, spec configSpec, depth int, context *evalCon
 			UndelegatedSecondaryExposures: exposures,
 			EvaluationDetails:             evalDetails,
 			DerivedDeviceMetadata:         deviceMetadata,
+			ConfigVersion:                 spec.ConfigVersion,
 		}
 	}
-	return &evalResult{Value: false, RuleID: defaultRuleID, SecondaryExposures: exposures, DerivedDeviceMetadata: deviceMetadata}
+	return &evalResult{Value: false, RuleID: defaultRuleID, SecondaryExposures: exposures, DerivedDeviceMetadata: deviceMetadata, ConfigVersion: spec.ConfigVersion}
 }
 
 func (e *evaluator) evalDelegate(user User, rule configRule, exposures []SecondaryExposure, depth int, context *evalContext) *evalResult {

logger.go

@@ -138,6 +138,10 @@ func (l *logger) logGateExposure(
 		metadata["isManualExposure"] = "true"
 	}
 
+	if res.ConfigVersion != nil {
+		metadata["configVersion"] = strconv.Itoa(*res.ConfigVersion)
+	}
+
 	evt := &ExposureEvent{
 		User:               user,
 		EventName:          GateExposureEventName,
@@ -158,10 +162,10 @@ func (l *logger) addEvaluationDetailsToExposureEvent(
 	evalDetails *EvaluationDetails,
 ) {
 	if evalDetails != nil {
-		evt.Metadata["reason"] = string(evalDetails.detailedReason())
-		evt.Metadata["configSyncTime"] = fmt.Sprint(evalDetails.ConfigSyncTime)
-		evt.Metadata["initTime"] = fmt.Sprint(evalDetails.InitTime)
-		evt.Metadata["serverTime"] = fmt.Sprint(evalDetails.ServerTime)
+		evt.Metadata["reason"] = evalDetails.detailedReason()
+		evt.Metadata["configSyncTime"] = strconv.FormatInt(evalDetails.ConfigSyncTime, 10)
+		evt.Metadata["initTime"] = strconv.FormatInt(evalDetails.InitTime, 10)
+		evt.Metadata["serverTime"] = strconv.FormatInt(evalDetails.ServerTime, 10)
 	}
 }
 
@@ -215,6 +219,9 @@ func (l *logger) logConfigExposure(
 	if context != nil && context.IsManualExposure {
 		metadata["isManualExposure"] = "true"
 	}
+	if res.ConfigVersion != nil {
+		metadata["configVersion"] = strconv.Itoa(*res.ConfigVersion)
+	}
 	evt := &ExposureEvent{
 		User:               user,
 		EventName:          ConfigExposureEventName,
@@ -257,6 +264,11 @@ func (l *logger) logLayerExposure(
 		"parameterName":       parameterName,
 		"isExplicitParameter": strconv.FormatBool(isExplicit),
 	}
+
+	if evalResult.ConfigVersion != nil {
+		metadata["configVersion"] = strconv.Itoa(*evalResult.ConfigVersion)
+	}
+
 	if context != nil && context.IsManualExposure {
 		metadata["isManualExposure"] = "true"
 	}

store.go

@@ -38,6 +38,7 @@ type configSpec struct {
 	HasSharedParams     *bool                  `json:"hasSharedParams,omitempty"`
 	TargetAppIDs        []string               `json:"targetAppIDs,omitempty"`
 	ForwardAllExposures *bool                  `json:"forwardAllExposures,omitempty"`
+	ConfigVersion       *int                   `json:"version,omitempty"`
 }
 
 func (c configSpec) hasTargetAppID(appId string) bool {