Uses golang.org/x/sync/errgroup internally. API is not changed.
package main
import (
"context"
"fmt"
"log"
"time"
"github.com/barklan/async"
)
type User struct {
name string
}
func main() {
promise := async.NewPromise(func() (User, error) {
time.Sleep(2 * time.Second)
return User{name: "Test"}, nil
})
fmt.Println("do someting else")
user, err := promise.Await(context.Background())
if err != nil {
log.Panic(err)
}
fmt.Println(user)
}