feat: add locust

Signed-off-by: DongYoung Kim <kwx4957@gmail.com>

Author: kwx4957

chaoslib/litmus/locust-loadgen/lib/locust-loadgen.go

@@ -102,17 +102,6 @@ func createHelperPod(ctx context.Context, experimentsDetails *experimentTypes.Ex
 	const volumeName = "script-volume"
 	const mountPath = "/mnt"
 
-	args := []string{
-		"--users", strconv.Itoa(experimentsDetails.Users),
-		"--spawn-rate", strconv.Itoa(experimentsDetails.SpawnRate),
-		"-H", experimentsDetails.Host,
-		"-t", strconv.Itoa(experimentsDetails.ChaosDuration) + "s",
-	}
-
-	if experimentsDetails.ConfigMapName != "" {
-		args = append(args, "-f", mountPath+"/config.py")
-	}
-
 	helperPod := &corev1.Pod{
 		ObjectMeta: v1.ObjectMeta{
 			GenerateName: experimentsDetails.ExperimentName + "-helper-",
@@ -132,7 +121,13 @@ func createHelperPod(ctx context.Context, experimentsDetails *experimentTypes.Ex
 						"locust",
 						"--headless",
 					},
-					Args:      args,
+					Args: []string{
+						"--users", strconv.Itoa(experimentsDetails.Users),
+						"--spawn-rate", strconv.Itoa(experimentsDetails.SpawnRate),
+						"-H", experimentsDetails.Host,
+						"-t", strconv.Itoa(experimentsDetails.ChaosDuration) + "s",
+						"-f", mountPath + "/" + experimentsDetails.ConfigMapKey,
+					},
 					Resources: chaosDetails.Resources,
 					VolumeMounts: []corev1.VolumeMount{
 						{

contribute/developer-guide/templates/chaoslib_helper.tmpl

@@ -20,6 +20,9 @@ import (
 )
 
 func experimentExecution(ctx context.Context, experimentsDetails *experimentTypes.ExperimentDetails, clients clients.ClientSets, resultDetails *types.ResultDetails, eventsDetails *types.EventDetails, chaosDetails *types.ChaosDetails) error {
+    // @TODO: setup tracing
+    // ctx, span := otel.Tracer(telemetry.TracerName).Start(ctx, "experimentExecution[name-your-chaos]Fault")
+    // defer span.End()
 
     // Get the target pod details for the chaos execution
 	// if the target pod is not defined it will derive the random target pod list using pod affected percentage
@@ -58,6 +61,10 @@ func experimentExecution(ctx context.Context, experimentsDetails *experimentType
 }
 
 func runChaos(ctx context.Context, experimentsDetails *experimentTypes.ExperimentDetails, targetPodList corev1.PodList, clients clients.ClientSets, resultDetails *types.ResultDetails, eventsDetails *types.EventDetails, chaosDetails *types.ChaosDetails) error {
+    // @TODO: setup tracing
+    // ctx, span := otel.Tracer(telemetry.TracerName).Start(ctx, "experimentExecution[name-your-chaos]Fault")
+    // defer span.End()
+
 	if experimentsDetails.EngineName != "" {
     		msg := "Injecting " + experimentsDetails.ExperimentName + " chaos on target pod"
     		types.SetEngineEventAttributes(eventsDetails, types.ChaosInject, msg, "Normal", chaosDetails)

pkg/load/locust-loadgen/environment/environment.go

@@ -13,14 +13,14 @@ func GetENV(experimentDetails *experimentTypes.ExperimentDetails) {
 	experimentDetails.ChaosNamespace = types.Getenv("CHAOS_NAMESPACE", "litmus")
 	experimentDetails.EngineName = types.Getenv("CHAOSENGINE", "")
 	experimentDetails.ChaosDuration, _ = strconv.Atoi(types.Getenv("TOTAL_CHAOS_DURATION", "30"))
-	experimentDetails.ChaosInterval, _ = strconv.Atoi(types.Getenv("CHAOS_INTERVAL", "10"))
 	experimentDetails.RampTime, _ = strconv.Atoi(types.Getenv("RAMP_TIME", "0"))
 	experimentDetails.Delay, _ = strconv.Atoi(types.Getenv("STATUS_CHECK_DELAY", "2"))
 	experimentDetails.Timeout, _ = strconv.Atoi(types.Getenv("STATUS_CHECK_TIMEOUT", "180"))
 	experimentDetails.LIBImage = types.Getenv("LIB_IMAGE", "locustio/locust")
 	experimentDetails.LIBImagePullPolicy = types.Getenv("LIB_IMAGE_PULL_POLICY", "Always")
 	experimentDetails.Host = types.Getenv("HOST", "")
 	experimentDetails.ConfigMapName = types.Getenv("CONFIG_MAP_NAME", "locust-script")
+	experimentDetails.ConfigMapKey = types.Getenv("CONFIG_MAP_KEY", "locust.py")
 	experimentDetails.Users, _ = strconv.Atoi(types.Getenv("USERS", "40"))
 	experimentDetails.SpawnRate, _ = strconv.Atoi(types.Getenv("SPAWN_RATE", "30"))
 }

pkg/load/locust-loadgen/types/types.go

@@ -6,14 +6,14 @@ type ExperimentDetails struct {
 	ChaosNamespace     string
 	EngineName         string
 	ChaosDuration      int
-	ChaosInterval      int
 	RampTime           int
 	Delay              int
 	Timeout            int
 	LIBImage           string
 	LIBImagePullPolicy string
 	Host               string
 	ConfigMapName      string
+	ConfigMapKey       string
 	Users              int
 	SpawnRate          int
 }