Interfaces

The Go SDK supports interfaces, which allow you to define Go-style interface definitions so that your module can accept arbitrary values from other modules without being tightly coupled to the concrete type underneath.

To use an interface, define a Go interface that embeds DaggerObject and use it in a function argument:

package main

import (
	"context"
)

type MyModule struct{}

type Fooer interface {
	DaggerObject
	Foo(ctx context.Context, bar int) (string, error)
}

func (m *MyModule) Foo(ctx context.Context, fooer Fooer) (string, error) {
	return fooer.Foo(ctx, 42)
}

Functions defined in interface definitions must match the client-side API signature style. If they return a scalar value or an array, they must accept a context.Context argument and return an error return value. If they return a chainable object value, they must not return an error value, and they do not need to include a context.Context argument.

Note that you must also provide argument names, since they directly translate to the GraphQL field argument names.