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viper_config.go
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viper_config.go
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package viperconfig
import (
"bytes"
"fmt"
"github.com/spf13/viper"
)
// CreateEnvViper creates viper to read variables from system enviroment
func CreateEnvViper() *viper.Viper {
envViper := viper.New()
envViper.SetEnvPrefix("HMY") // will be uppercased automatically
envViper.AutomaticEnv()
return envViper
}
// CreateConfFileViper creates viper to read from config file
// Now the config file is JSON type, name is "config.json"
func CreateConfFileViper(filePath, confName, confType string) *viper.Viper {
configFileViper := viper.New()
configFileViper.SetConfigName(confName) // name of config file (without extension)
configFileViper.SetConfigType(confType) // REQUIRED if the config file does not have the extension in the name
configFileViper.AddConfigPath(filePath) // look for the file in filePath
configFileViper.AddConfigPath(".") // or look for config in the working directory
if err := configFileViper.ReadInConfig(); err != nil {
if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
panic(fmt.Errorf("fatal error config file: %s", err))
}
}
return configFileViper
}
func getEnvName(sectionName string, flagName string) string {
var buffer bytes.Buffer
if sectionName != "" {
buffer.WriteString("_")
buffer.WriteString(sectionName)
}
buffer.WriteString("_")
buffer.WriteString(flagName)
return buffer.String()
}
func getConfName(sectionName string, flagName string) string {
var buffer bytes.Buffer
if sectionName != "" {
buffer.WriteString(sectionName)
buffer.WriteString(".")
}
buffer.WriteString(flagName)
return buffer.String()
}
// ResetConfUInt resets UInt value to value from config files and system environment variable
func ResetConfUInt(value *uint, envViper *viper.Viper, configFileViper *viper.Viper, sectionName string, flagName string) {
var confRet = configFileViper.GetInt(getConfName(sectionName, flagName))
if confRet != 0 {
*value = uint(confRet)
return
}
var envRet = envViper.GetInt(getEnvName(sectionName, flagName))
if envRet != 0 {
*value = uint(envRet)
return
}
}
// ResetConfInt resets INT value to value from config files and system environment variable
func ResetConfInt(value *int, envViper *viper.Viper, configFileViper *viper.Viper, sectionName string, flagName string) {
var confRet = configFileViper.GetInt(getConfName(sectionName, flagName))
if confRet != 0 {
*value = confRet
return
}
var envRet = envViper.GetInt(getEnvName(sectionName, flagName))
if envRet != 0 {
*value = envRet
return
}
}
// ResetConfBool resets Bool value to value from config files and system environment variable
func ResetConfBool(value *bool, envViper *viper.Viper, configFileViper *viper.Viper, sectionName string, flagName string) {
var confRet = configFileViper.GetBool(getConfName(sectionName, flagName))
if confRet {
*value = confRet
return
}
var envRet = envViper.GetBool(getEnvName(sectionName, flagName))
if envRet {
*value = envRet
return
}
}
// ResetConfString resets String value to value from config files and system environment variable
func ResetConfString(value *string, envViper *viper.Viper, configFileViper *viper.Viper, sectionName string, flagName string) {
var confRet = configFileViper.GetString(getConfName(sectionName, flagName))
if confRet != "" {
*value = confRet
return
}
var envRet = envViper.GetString(getEnvName(sectionName, flagName))
if envRet != "" {
*value = envRet
return
}
}