zbchi opened a new pull request, #3185:
URL: https://github.com/apache/dubbo-go/pull/3185
### Description
Fixes #3181
Polaris 路由失效，原因是通过 context 传递的 attachments 没有被正确读取到 invocation 中。
在调用链中：
1. 用户通过 context.WithValue() 设置路由所需的元数据
2. 从 context 中提取这些 attachments发生在路由选择之后
### Solution
修改 generateInvocation 函数签名，增加 ctx context.Context 参数
在生成invocation时从 ctx.Value(constant.AttachmentKey) 提取用户设置的 attachments
### Checklist
- [x] I confirm the target branch is `develop`
- [x] Code has passed local testing
- [x] I have added tests that prove my fix is effective or that my feature
works
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