feat: add MCP SSE stateful session load balancer support (#2818)

pkg/ingress/kube/annotations/loadbalance.go

@@ -66,9 +66,10 @@ type consistentHashByCookie struct {
 }
 
 type LoadBalanceConfig struct {
-	simple networking.LoadBalancerSettings_SimpleLB
-	other  *consistentHashByOther
-	cookie *consistentHashByCookie
+	simple         networking.LoadBalancerSettings_SimpleLB
+	other          *consistentHashByOther
+	cookie         *consistentHashByCookie
+	McpSseStateful bool
 }
 
 type loadBalance struct{}
@@ -129,7 +130,11 @@ func (l loadBalance) Parse(annotations Annotations, config *Ingress, _ *GlobalCo
 	} else {
 		if lb, err := annotations.ParseStringASAP(loadBalanceAnnotation); err == nil {
 			lb = strings.ToUpper(lb)
-			loadBalanceConfig.simple = networking.LoadBalancerSettings_SimpleLB(networking.LoadBalancerSettings_SimpleLB_value[lb])
+			if lb == "MCP-SSE" {
+				loadBalanceConfig.McpSseStateful = true
+			} else {
+				loadBalanceConfig.simple = networking.LoadBalancerSettings_SimpleLB(networking.LoadBalancerSettings_SimpleLB_value[lb])
+			}
 		}
 	}
 

pkg/ingress/kube/common/tool.go

@@ -146,7 +146,7 @@ func GetHost(annotations map[string]string) string {
 
 // Istio requires that the name of the gateway must conform to the DNS label.
 // For details, you can view: https://github.com/istio/istio/blob/2d5c40ad5e9cceebe64106005aa38381097da2ba/pkg/config/validation/validation.go#L478
-func convertToDNSLabelValid(input string) string {
+func ConvertToDNSLabelValid(input string) string {
 	hasher := md5.New()
 	hasher.Write([]byte(input))
 	hash := hasher.Sum(nil)
@@ -156,7 +156,7 @@ func convertToDNSLabelValid(input string) string {
 
 // CleanHost follow the format of mse-ops for host.
 func CleanHost(host string) string {
-	return convertToDNSLabelValid(host)
+	return ConvertToDNSLabelValid(host)
 }
 
 func CreateConvertedName(items ...string) string {