Unable to load configs into custom types

[wjiec]

Describe the bug
Unable to load configs with custom types and as well as custom UnmarshalYAML implementations.

To Reproduce

1. The code is

//
// internal/config/config.go
//
type Config struct {
	rest.RestConf
	Schedule DurationOrCronSpec
}

type DurationOrCronSpec struct {
	dur  time.Duration
	spec string
}

func (d *DurationOrCronSpec) UnmarshalYAML(value *yaml.Node) error {
	if value.Kind != yaml.ScalarNode {
		return fmt.Errorf("pipeline must contain YAML scalar, has %v", value.Kind)
	}

	if err := value.Decode(&d.dur); err != nil {
		return value.Decode(&d.spec)
	}
	return nil
}

//
// etc/greet.yaml
//
Name: ping
Host: 127.0.0.1
Port: 8888
Log:
  Encoding: plain
Schedule: 20m

2. The error is

   2024/10/21 09:19:39 error: config file etc/greet.yaml, type mismatch for field "Schedule"
   

Expected behavior
Load configuration files correctly

Environments (please complete the following information):

• OS: Ubuntu 22.04.4 LTS
• go-zero version: v1.7.3
• goctl version: goctl version 1.7.3 linux/amd64

More description
I think that's enough.

[kesonan]

Obviously, you declared a structure, but the yaml file contains a string. The types do not match.

[wjiec]

@kesonan Thanks for the quick reply, as you can see, in order to convert the string type to the struct type I need, I implemented a unmarshaler to enable custom unmarshal of the string. But from the code it looks like go-zero first deserializes the YAML data into a map[string]any object and then tries to assign from the map object to the corresponding Config structure, which obviously loses support for yaml.Unmarshaler.