Whitelist: selector middleware doesn't work for grpc

[akoserwal]

What happened:

As shown for HTTP middleware the selector middleware works, but not the case with grpc
https://github.com/go-kratos/beer-shop/blob/a29eae57a9baeae9969e9a7d418ff677cf494a21/app/shop/interface/internal/server/http.go#L41

How to reproduce it (as minimally and precisely as possible):

Adding selector middleware as shown https://github.com/go-kratos/beer-shop/blob/a29eae57a9baeae9969e9a7d418ff677cf494a21/app/shop/interface/internal/server/http.go#L41
for grpc middleware

Anything else we need to know?:

https://github.com/go-kratos/kratos/blob/main/middleware/selector/selector.go#L92

Selector middleware works for unary, server streaming . but it doesn't work in case of "bidirectional streaming rpc". I was using grpcurl commandline utility which by default uses bidirectional streaming rpc.

operation := info.Operation()
value of the operation in case of grpc would give grpc.reflection.v1.ServerReflection/ServerReflectionInfo
which doesn't give info about method called.

Environment:

• Kratos version (use kratos -v): v2.7.3
• Go version (use go version): 1.21
• OS (e.g: cat /etc/os-release): Darwin
• Others:

[shenqidebaozi]

@akoserwal grpc.reflection.v1.ServerReflection/ServerReflectionInfo is a streaming RPC that has been previously discussed and cannot be overwritten by middleware at this time. I will also carefully review the previous communication recently.

[dosubot]

Hi, @akoserwal. I'm Dosu, and I'm helping the Kratos team manage their backlog. I'm marking this issue as stale.

Issue Summary:

• The issue involves the selector middleware in Kratos, which works for HTTP but not for gRPC, particularly in bidirectional streaming RPCs.
• The middleware does not provide method information for gRPC operations, as observed with grpcurl.
• The issue is specific to Kratos version v2.7.3 and Go version 1.21 on Darwin OS.
• @shenqidebaozi noted that grpc.reflection.v1.ServerReflection/ServerReflectionInfo is a streaming RPC that cannot be modified by middleware and suggested reviewing past discussions.

Next Steps:

• Please confirm if this issue is still relevant to the latest version of the Kratos repository. If so, you can keep the discussion open by commenting on the issue.
• If there is no further activity, the issue will be automatically closed in 7 days.

Thank you for your understanding and contribution!