changed feature flag to int value for more configurability

also adjusted the resource limit for the frauddetection service since it kept dying

Author: EislM0203

docker-compose.yml

@@ -247,7 +247,7 @@ services:
     deploy:
       resources:
         limits:
-          memory: 200M
+          memory: 300M
     restart: unless-stopped
     environment:
       - FLAGD_HOST

src/checkoutservice/main.go

@@ -507,16 +507,16 @@ func (cs *checkoutService) sendToPostProcessor(ctx context.Context, result *pb.O
 	successMsg := <-cs.KafkaProducerClient.Successes()
 	log.Infof("Successful to write message. offset: %v", successMsg.Offset)
 
-	if cs.isFeatureFlagEnabled(ctx, "kafakQueueProblems") {
-		log.Infof("Warning: FeatureFlag 'kafakQueueProblems' is activated, overloading queue now.")
-		messageCount := 100
-		for i := 0; i < messageCount; i++ {
+	ffValue := cs.getIntFeatureFlag(ctx, "kafkaQueueProblems")
+	if ffValue > 0 {
+		log.Infof("Warning: FeatureFlag 'kafkaQueueProblems' is activated, overloading queue now.")
+		for i := 0; i < ffValue; i++ {
     		go func(i int) {
     		    cs.KafkaProducerClient.Input() <- &msg
 				_ = <-cs.KafkaProducerClient.Successes()
             }(i)
 		}
-		log.Infof("Done with #%d messages for overload simulation.", messageCount)
+		log.Infof("Done with #%d messages for overload simulation.", ffValue)
 	}
 }
 
@@ -560,3 +560,18 @@ func (cs *checkoutService) isFeatureFlagEnabled(ctx context.Context, featureFlag
 
     return featureEnabled
 }
+
+func (cs *checkoutService) getIntFeatureFlag(ctx context.Context, featureFlagName string) int {
+    openfeature.AddHooks(otelhooks.NewTracesHook())
+    client := openfeature.NewClient("checkout")
+    
+    // Default value is set to 0, but you could also make this a parameter.
+    featureFlagValue, _ := client.IntValue(
+        ctx, 
+        featureFlagName, 
+        0, 
+        openfeature.EvaluationContext{},
+    )
+    
+    return int(featureFlagValue)
+}

src/flagd/demo.flagd.json

@@ -61,12 +61,12 @@
         ]
       }
     },
-    "kafakQueueProblems": {
+    "kafkaQueueProblems": {
       "description": "Overloads Kafka queue while simultaneously introducing a consumer side delay leading to a lag spike",
       "state": "ENABLED",
       "variants": {
-          "on": true,
-          "off": false
+          "on": 100,
+          "off": 0
         },
         "defaultVariant": "off"
     },

src/frauddetectionservice/src/main/kotlin/frauddetectionservice/main.kt

@@ -58,8 +58,8 @@ fun main() {
                     val newCount = accumulator + 1
                     val orders = OrderResult.parseFrom(record.value())
                     logger.info("Consumed record with orderId: ${orders.orderId}, and updated total count to: $newCount")
-                    if (getFeatureFlagEnabled("kafakQueueProblems")) {
-                        logger.info("FeatureFlag 'kafakQueueProblems' is enabled, sleeping 1 second")
+                    if (getFeatureFlagValue("kafkaQueueProblems") > 0) {
+                        logger.info("FeatureFlag 'kafkaQueueProblems' is enabled, sleeping 1 second")
                         Thread.sleep(1000)
                     }
                     newCount
@@ -74,11 +74,11 @@ fun main() {
 * @param ff The name of the feature flag to retrieve.
 * @return `true` if the feature flag is enabled, `false` otherwise or in case of errors.
 */
-fun getFeatureFlagEnabled(ff: String): Boolean {
+fun getFeatureFlagValue(ff: String): Int {
     val client = OpenFeatureAPI.getInstance().client
     // TODO: Plumb the actual session ID from the frontend via baggage?
     val uuid = UUID.randomUUID()
     client.evaluationContext = MutableContext().add("session", uuid.toString())
-    val booleanValue = client.getBooleanValue(ff, false)
-    return booleanValue
+    val intValue = client.getIntegerValue(ff, 0)
+    return intValue
 }