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gonfig.go
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gonfig.go
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package gonfig
import (
"encoding/json"
"encoding/xml"
"io/ioutil"
"os"
"path/filepath"
"github.com/luizvnasc/goenv"
"github.com/pelletier/go-toml"
"gopkg.in/yaml.v3"
)
type unmarshalerFunc func(data []byte, v interface{}) error
// Load a struct with the configuration from a config file.
func Load(config interface{}, args ...string) error {
if len(args) == 0 {
err := goenv.Unmarshal(config)
return err
}
path := args[0]
unmarshaler, err := getUnmarshaler(path)
if err != nil {
return err
}
content, err := getFileContent(path)
if err != nil {
return LoadError
}
err = unmarshaler(content, config)
if err != nil {
return LoadError
}
return nil
}
func getUnmarshaler(path string) (unmarshalerFunc, error) {
ext := filepath.Ext(path)
switch {
case ext == ".json":
return json.Unmarshal, nil
case ext == ".xml":
return xml.Unmarshal, nil
case ext == ".yaml" || ext == ".yml":
return yaml.Unmarshal, nil
case ext == ".toml":
return toml.Unmarshal, nil
default:
return nil, UnsupportedFileError
}
}
func getFileContent(path string) (bytes []byte, err error) {
configFile, err := os.Open(path)
if err != nil {
return
}
defer configFile.Close()
bytes, err = ioutil.ReadAll(configFile)
return
}