Add a method filter for interceptors #459

CAFxX · 2021-09-17T07:13:18Z

This PR is an RFC for a conditional interceptor for specific gRPC methods.

It allows applying an interceptor (sub)chain only to specific methods, or to all but some specific methods, e.g.

// Method1 -> authInterceptor
// Method2 -> authInterceptor, otherInterceptor
// all other methods -> otherInterceptor
ChainUnaryServer(
  // apply the authInterceptor only to `Method1` and `Method2`
  UnaryServerMethods(authInterceptor, true, "/package.service/Method1", "/package.service/Method2"),
  // apply otherInterceptor to all methods apart from `Method1`
  UnaryServerMethods(otherInterceptor, false, "/package.service/Method1"),
)

update: I see we have #364 in v2 (although it's unreleased)

CAFxX · 2021-09-17T07:15:45Z

filter/server_interceptors.go

+/*
+func UnaryServerMethodsInterceptor(interceptor grpc.UnaryServerInterceptor, allowlist bool, methods ...string) grpc.UnaryServerInterceptor {
+	m := newMatchlist(methods, allowlist)
+
+	return UnaryServerConditionInterceptor(interceptor, func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo) bool {
+		return m.match(info.FullMethod)
+	})
+}
+
+func UnaryServerConditionInterceptor(interceptor grpc.UnaryServerInterceptor, condition func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo) bool) grpc.UnaryServerInterceptor {
+	if interceptor == nil {
+		panic("nil interceptor")
+	}
+	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+		if condition(ctx, req, info) {
+			return interceptor(ctx, req, info, handler)
+		}
+		return handler(ctx, req)
+	}
+}
+*/


this is an alternate implementation style in case we want to support plugging in arbitrary conditions

add a method filter

30f9367

CAFxX commented Sep 17, 2021

View reviewed changes

devnev added the v1 label Oct 8, 2022

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Add a method filter for interceptors #459

Add a method filter for interceptors #459

CAFxX commented Sep 17, 2021 •

edited

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CAFxX Sep 17, 2021

Add a method filter for interceptors #459

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Add a method filter for interceptors #459

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CAFxX commented Sep 17, 2021 •

edited

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