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key.go
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key.go
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package miruken
import (
"fmt"
"reflect"
"github.com/miruken-go/miruken/promise"
)
// Key is a miruken.DependencyResolver for resolving
// values referenced by a string key.
type Key string
//goland:noinspection GoMixedReceiverTypes
func (k *Key) InitWithTag(tag reflect.StructTag) error {
if key, ok := tag.Lookup("of"); ok {
*k = Key(key)
}
return nil
}
//goland:noinspection GoMixedReceiverTypes
func (k Key) Resolve(
typ reflect.Type,
dep DependencyArg,
ctx HandleContext,
) (v reflect.Value, pv *promise.Promise[reflect.Value], err error) {
var builder ProvidesBuilder
p := builder.WithKey(string(k)).New()
if result, pr, err2 := p.Resolve(ctx, false); err2 != nil {
err = fmt.Errorf("key: unable to resolve dependency %q: %w", k, err2)
} else if pr == nil {
if result != nil {
v = reflect.ValueOf(result)
} else if dep.Optional() {
v = reflect.Zero(typ)
} else {
err = fmt.Errorf("key: unable to resolve dependency %q", k)
}
} else {
pv = promise.Then(pr, func(res any) reflect.Value {
var val reflect.Value
if res != nil {
val = reflect.ValueOf(res)
} else if dep.Optional() {
val = reflect.Zero(typ)
} else {
panic(fmt.Errorf("key: unable to resolve dependency %q", k))
}
return val
})
}
return
}