DNS Chaos - Format TargetHostnames String For dns_interceptor Binary

chaoslib/litmus/pod-dns-chaos/helper/dnschaos.go

@@ -4,10 +4,6 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"github.com/litmuschaos/litmus-go/pkg/cerrors"
-	"github.com/litmuschaos/litmus-go/pkg/telemetry"
-	"github.com/palantir/stacktrace"
-	"go.opentelemetry.io/otel"
 	"os"
 	"os/exec"
 	"os/signal"
@@ -16,6 +12,11 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/litmuschaos/litmus-go/pkg/cerrors"
+	"github.com/litmuschaos/litmus-go/pkg/telemetry"
+	"github.com/palantir/stacktrace"
+	"go.opentelemetry.io/otel"
+
 	clients "github.com/litmuschaos/litmus-go/pkg/clients"
 	"github.com/litmuschaos/litmus-go/pkg/events"
 	experimentTypes "github.com/litmuschaos/litmus-go/pkg/generic/pod-dns-chaos/types"

chaoslib/litmus/pod-dns-chaos/lib/pod-dns-chaos.go

@@ -28,6 +28,13 @@ import (
 func PrepareAndInjectChaos(ctx context.Context, experimentsDetails *experimentTypes.ExperimentDetails, clients clients.ClientSets, resultDetails *types.ResultDetails, eventsDetails *types.EventDetails, chaosDetails *types.ChaosDetails) error {
 	ctx, span := otel.Tracer(telemetry.TracerName).Start(ctx, "PreparePodDNSFault")
 	defer span.End()
+
+	// Validate the experiment target hostnames
+	var err error
+	experimentsDetails.TargetHostNames, err = stringutils.ParseHostnames(experimentsDetails.TargetHostNames)
+	if err != nil {
+		return stacktrace.Propagate(err, "failed to parse target hostnames")
+	}
 	// 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
 	if experimentsDetails.TargetPods == "" && chaosDetails.AppDetail == nil {

pkg/utils/stringutils/string.go

@@ -3,6 +3,9 @@ package stringutils
 import (
 	"math/rand"
 	"time"
+	"strings"
+	"fmt"
+	"encoding/json"
 )
 
 const (
@@ -33,3 +36,41 @@ func RandStringBytesMask(n int, src rand.Source) string {
 
 	return string(b)
 }
+
+func ParseHostnames(input string) (string, error) {
+
+	if(input == "") {
+		return input, nil
+	}	
+
+	var parsed []string
+
+	// Try JSON parse first
+	if(strings.HasPrefix(input, "[") && strings.HasSuffix(input, "]")) {
+		err := json.Unmarshal([]byte(input), &parsed)
+		if err == nil {
+			// Input was valid JSON list of strings
+			return input, nil
+		} else {
+			return "", fmt.Errorf("failed to parse input as JSON: %v", err)
+		}
+	}
+
+
+	// If not in JSON format, fallback to comma-separated logic
+	parts := strings.Split(input, ",")
+	for part := range parts {
+            part = strings.TrimSpace(part)
+            if part != "" {
+                parsed = append(parsed, part)
+            }
+        }
+
+	// Rebuild as JSON array of strings
+	jsonBytes, err := json.Marshal(parsed)
+	if err != nil {
+		return "", fmt.Errorf("failed to format names: %v", err)
+	}
+
+	return string(jsonBytes), nil
+}