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generic_go1.18.go
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generic_go1.18.go
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//go:build go1.18
// +build go1.18
package usecase
import (
"context"
"fmt"
)
// ErrInvalidType is returned on port type assertion error.
const ErrInvalidType = sentinelError("invalid type")
// IOInteractorOf is an IOInteractor with parametrized input/output types.
type IOInteractorOf[i, o any] struct {
IOInteractor
InteractFunc func(ctx context.Context, input i, output *o) error
}
// Invoke calls interact function in a type-safe way.
func (ioi IOInteractorOf[i, o]) Invoke(ctx context.Context, input i, output *o) error {
return ioi.InteractFunc(ctx, input, output)
}
// NewInteractor creates generic use case interactor with input and output ports.
//
// It pre-fills name and title with caller function.
// Input is passed by value, while output is passed by pointer to be mutable.
func NewInteractor[i, o any](interact func(ctx context.Context, input i, output *o) error, options ...func(i *IOInteractor)) IOInteractorOf[i, o] {
u := IOInteractorOf[i, o]{}
u.Input = *new(i)
u.Output = new(o)
u.InteractFunc = interact
u.Interactor = Interact(func(ctx context.Context, input, output any) error {
inp, ok := input.(i)
if !ok {
return fmt.Errorf("%w of input: %T, expected: %T", ErrInvalidType, input, u.Input)
}
out, ok := output.(*o)
if !ok {
return fmt.Errorf("%w f output: %T, expected: %T", ErrInvalidType, output, u.Output)
}
return interact(ctx, inp, out)
})
u.name, u.title = callerFunc()
u.name = filterName(u.name)
for _, o := range options {
o(&u.IOInteractor)
}
return u
}