all: sync with master

internal/next/configmgr/error.go

@@ -3,25 +3,29 @@ package configmgr
 import (
 	"fmt"
 
+	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/timeutil"
 	"golang.org/x/exp/constraints"
 )
 
+// validator is the interface for configuration entities that can validate
+// themselves.
+type validator interface {
+	// validate returns an error if the entity isn't valid.
+	validate() (err error)
+}
+
 // numberOrDuration is the constraint for integer types along with
 // timeutil.Duration.
 type numberOrDuration interface {
 	constraints.Integer | timeutil.Duration
 }
 
-// newMustBePositiveError returns an error about the value that must be positive
-// but isn't.  prop is the name of the property to mention in the error message.
+// newErrNotPositive returns an error about the value that must be positive but
+// isn't.  prop is the name of the property to mention in the error message.
 //
 // TODO(a.garipov): Consider moving such helpers to golibs and use in AdGuardDNS
 // as well.
-func newMustBePositiveError[T numberOrDuration](prop string, v T) (err error) {
-	if s, ok := any(v).(fmt.Stringer); ok {
-		return fmt.Errorf("%s must be positive, got %s", prop, s)
-	}
-
-	return fmt.Errorf("%s must be positive, got %d", prop, v)
+func newErrNotPositive[T numberOrDuration](prop string, v T) (err error) {
+	return fmt.Errorf("%s: %w, got %v", prop, errors.ErrNotPositive, v)
 }