refactor registry & add direct service discovery through staticIP or DNS (#261)

pkg/ingress/config/ingress_config.go

@@ -710,6 +710,7 @@ func (m *IngressConfig) convertIstioWasmPlugin(obj *higressext.WasmPlugin) (*ext
 	if !obj.DefaultConfigDisable {
 		result.PluginConfig = obj.DefaultConfig
 	}
+	hasValidRule := false
 	if len(obj.MatchRules) > 0 {
 		if result.PluginConfig == nil {
 			result.PluginConfig = &types.Struct{
@@ -769,14 +770,20 @@ func (m *IngressConfig) convertIstioWasmPlugin(obj *higressext.WasmPlugin) (*ext
 				Kind: v,
 			})
 		}
-		result.PluginConfig.Fields["_rules_"] = &types.Value{
-			Kind: &types.Value_ListValue{
-				ListValue: &types.ListValue{
-					Values: ruleValues,
+		if len(ruleValues) > 0 {
+			hasValidRule = true
+			result.PluginConfig.Fields["_rules_"] = &types.Value{
+				Kind: &types.Value_ListValue{
+					ListValue: &types.ListValue{
+						Values: ruleValues,
+					},
 				},
-			},
+			}
 		}
 	}
+	if !hasValidRule && obj.DefaultConfigDisable {
+		return nil, nil
+	}
 	return result, nil
 
 }
@@ -807,6 +814,14 @@ func (m *IngressConfig) AddOrUpdateWasmPlugin(clusterNamespacedName util.Cluster
 		IngressLog.Errorf("invalid wasmPlugin:%s, err:%v", clusterNamespacedName.Name, err)
 		return
 	}
+	if istioWasmPlugin == nil {
+		IngressLog.Infof("wasmPlugin:%s will not be transferred to istio since config disabled",
+			clusterNamespacedName.Name)
+		m.mutex.Lock()
+		delete(m.wasmPlugins, clusterNamespacedName.Name)
+		m.mutex.Unlock()
+		return
+	}
 	IngressLog.Debugf("wasmPlugin:%s convert to istioWasmPlugin:%v", clusterNamespacedName.Name, istioWasmPlugin)
 	m.mutex.Lock()
 	m.wasmPlugins[clusterNamespacedName.Name] = istioWasmPlugin