Derive Macro GrpcError 

#[derive(GrpcError)]
{
    // Attributes available to this derive:
    #[grpc]
}

Derives the GrpcError trait for an error enum.

Attributes

• #[grpc(internal)] - Marks a variant as an internal error (will map to tonic::Code::Internal)

Generated Code

This macro generates:

1. A companion *GrpcError enum with #[repr(u8)] for wire serialization
2. An implementation of the GrpcError trait for the companion enum
3. A method api_error() on the original enum that maps to the companion enum
4. An implementation of From<Error> for tonic::Status for automatic error conversion