Golang equivalent to Python's NotImplementedException

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Is there an equivalent in Golang to raising a NotImplementedException in Python when you define an interface with methods that you don't want to implement yet? Is this idiomatic Golang?

For example:

type MyInterface interface {
    Method1() bool
    Method2() bool
}


// Implement this interface
type Thing struct {}
func (t *Thing) Method1() bool {
    return true
}

func (t *Thing) Method2() bool {
    // I don't want to implement this yet
}

Usually in golang if you want to implement error handling you return an error

type MyInterface interface {
    Method1() bool
    Method2() (bool, error)
}

Then you can return an error. You can also log, or panic as @coredump said in the comments.

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a empty var will do this

var _ MyInterface = &Thing{}

if Thing doesn't implement the interface MyInterface, compile will fail

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Here's an example that was generated from my implementation of gRPC in Go:

import (
    status "google.golang.org/grpc/status"
)

// . . .

// UnimplementedInstanceControlServer can be embedded to have forward compatible implementations.
type UnimplementedInstanceControlServer struct {
}

func (*UnimplementedInstanceControlServer) HealthCheck(ctx context.Context, req *empty.Empty) (*HealthCheckResult, error) {
    return nil, status.Errorf(codes.Unimplemented, "method HealthCheck not implemented")
}

Alternatively, you could log an error inside the method and then return a nil to satisfy the method contract.

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Comments
  • Is it important if it is idiomatic? If it helps you, panic or log, that should be enough.
  • Not necessarily important, but I am still learning Go and want to understand the proper ways to use it.
  • I feel there's no correct answer to this. Interfaces are implemented implicitly, so if you created the interface in this case, then you should just modify it or separate into two separate interfaces. If you haven't, you should probably read the documentation and figure out how whatever uses the interface behaves and when would Method2 be called anyway (e.g. if it's close file and you don't have a file to close, you can just do nothing and return success). In short, highly recommend that you give more information to get a better answer.