This repository contains code examples in different languages which demonstrate handling errors in gRPC.
Check the hello.proto file to see the gRPC method definitions. It has two methods SayHello and SayHelloStrict:
func SayHello(name) {
    return "Hey, (name)!"
}
SayHelloStrict is similar, but throws an error if the length of name is more than 10 characters.
Each language directories have instructions to generate gRPC methods in respective languages. I assume that you have done the basic tutorials.
Check this page for quick guide and examples of all languages - gRPC Errors
The mighty MIT license. Please check LICENSE for more details.