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package config
import (
"errors"
"fmt"
"strings"
"github.com/spf13/viper"
)
type ViperProvider struct {
viper *viper.Viper
Path string
Prefix string
}
//////// ENDURE //////////
func (v *ViperProvider) Init() error {
v.viper = viper.New()
// read in environment variables that match
v.viper.AutomaticEnv()
if v.Prefix == "" {
return errors.New("prefix should be set")
}
v.viper.SetEnvPrefix(v.Prefix)
if v.Path == "" {
return errors.New("path should be set")
}
v.viper.SetConfigFile(v.Path)
v.viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
return v.viper.ReadInConfig()
}
///////////// VIPER ///////////////
// Overwrite overwrites existing config with provided values
func (v *ViperProvider) Overwrite(values map[string]string) error {
if len(values) != 0 {
for _, flag := range values {
key, value, err := parseFlag(flag)
if err != nil {
return err
}
v.viper.Set(key, value)
}
}
return nil
}
//
func (v *ViperProvider) UnmarshalKey(name string, out interface{}) error {
err := v.viper.UnmarshalKey(name, &out)
if err != nil {
return err
}
return nil
}
// Get raw config in a form of config section.
func (v *ViperProvider) Get(name string) interface{} {
return v.viper.Get(name)
}
/////////// PRIVATE //////////////
func parseFlag(flag string) (string, string, error) {
if !strings.Contains(flag, "=") {
return "", "", fmt.Errorf("invalid flag `%s`", flag)
}
parts := strings.SplitN(strings.TrimLeft(flag, " \"'`"), "=", 2)
return strings.Trim(parts[0], " \n\t"), parseValue(strings.Trim(parts[1], " \n\t")), nil
}
func parseValue(value string) string {
escape := []rune(value)[0]
if escape == '"' || escape == '\'' || escape == '`' {
value = strings.Trim(value, string(escape))
value = strings.Replace(value, fmt.Sprintf("\\%s", string(escape)), string(escape), -1)
}
return value
}
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