AlexStocks commented on code in PR #3687:
URL: https://github.com/apache/dubbo-go/pull/3687#discussion_r3819208688


##########
common/extension/runtime.go:
##########
@@ -0,0 +1,187 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package extension
+
+import (
+       "fmt"
+       "strings"
+)
+
+import (
+       "dubbo.apache.org/dubbo-go/v3/common"
+       "dubbo.apache.org/dubbo-go/v3/filter"
+)
+
+// Scope identifies an extension lifecycle level. Definition.Scopes uses the
+// values as a bit mask; Context.Scope always contains one concrete scope.
+type Scope uint8
+
+const (
+       // InstanceScope is the lifecycle of a dubbo.Instance.
+       InstanceScope Scope = 1 << iota
+       // ClientScope is the lifecycle of a client/consumer.
+       ClientScope
+       // ServerScope is the lifecycle of a server/provider.
+       ServerScope
+)
+
+// RoleNone identifies an Instance context, which has no consumer/provider
+// role. It is intentionally outside common.RoleType's URL role constants.
+const RoleNone common.RoleType = -1
+
+// Resource identifies the service or method to which an extension is bound.
+// The core constructs Resource values and extensions treat them as read-only.
+type Resource struct {

Review Comment:
   [P1] 这里缺少 Issue #3686 验收标准中明确要求的 `Resource.Validate()`。当前 Head 的外部契约探针调用 
`r.Validate()` 会直接编译失败:`r.Validate undefined`;同时后续绑定流程也没有入口拒绝 `ServiceKey` 与 
`common.ServiceKey(Interface, Group, Version)` 不一致的资源,扩展可能据此把配置或 filter 
绑定到错误服务。请实现该校验,并补充一致、不一致及空接口边界测试。



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