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| type wrappedStream struct { 1 | |
| grpc.ServerStream | |
| } | |
| func newWrappedStream(s grpc.ServerStream) grpc.ServerStream { | |
| return &wrappedStream{s} | |
| } | |
| func (w *wrappedStream) RecvMsg(m interface{}) error { | |
| ------ | |
| return w.ServerStream.RecvMsg(m) | |
| } | |
| func (w *wrappedStream) SendMsg(m interface{}) error { | |
| ------- | |
| return w.ServerStream.SendMsg(m) | |
| } | |
| func exampleServerStreamInterceptor(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error { | |
| // authentication (token verification) | |
| md, ok := metadata.FromIncomingContext(ss.Context()) | |
| if !ok { | |
| return errMissingMetadata | |
| } | |
| /* | |
| auth logic, for instance check token in metadata | |
| */ | |
| err := handler(srv, newWrappedStream(ss)) | |
| return err | |
| } | |
| ... | |
| // Registering gRPC server with ServerInterceptor | |
| s := grpc.NewServer(grpc.StreamInterceptor(exampleServerStreamInterceptor)) | |
| ... |
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