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env.go
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env.go
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package env
import (
"fmt"
"strings"
"sync"
"time"
"github.com/go-playground/validator/v10"
"github.com/spf13/viper"
)
var validators = map[string][]string{}
var v = validator.New()
var mu = &sync.Mutex{}
func init() {
v.RegisterValidation("required_for_env", RequiredForEnv)
}
func RegisterValidation(name string, tags ...string) {
mu.Lock()
defer mu.Unlock()
validators[name] = dedupe(append(validators[name], tags...))
}
func GetBool(name string) bool { return get(name, viper.GetBool) }
func GetDuration(name string) time.Duration { return get(name, viper.GetDuration) }
func GetFloat64(name string) float64 { return get(name, viper.GetFloat64) }
func GetInt(name string) int { return get(name, viper.GetInt) }
func GetInt64(name string) int64 { return get(name, viper.GetInt64) }
func GetSizeInBytes(name string) uint { return get(name, viper.GetSizeInBytes) }
func GetString(name string) string { return get(name, viper.GetString) }
func GetStringMap(name string) map[string]interface{} { return get(name, viper.GetStringMap) }
func GetStringMapString(name string) map[string]string { return get(name, viper.GetStringMapString) }
func GetStringSlice(name string) []string { return get(name, viper.GetStringSlice) }
func GetTime(name string) time.Time { return get(name, viper.GetTime) }
func GetStringMapStringSlice(name string) map[string][]string {
return get(name, viper.GetStringMapStringSlice)
}
func get[T any](name string, fetchFunc func(string) T) T {
mu.Lock()
defer mu.Unlock()
val := fetchFunc(name)
for _, tag := range validators[name] {
if err := v.Var(val, tag); err != nil {
panic(fmt.Errorf("invalid env var: %s failed when validating tag %s", name, tag))
}
}
return val
}
var RequiredForEnv validator.Func = func(fl validator.FieldLevel) bool {
s := fl.Field().String()
if s == "" {
return false
}
spl := strings.Split(s, "=")
if len(spl) != 2 {
return false
}
return spl[1] == GetString("ENV")
}
func dedupe(src []string) []string {
result := src[:0]
seen := make(map[string]bool)
for _, x := range src {
if !seen[x] {
result = append(result, x)
seen[x] = true
}
}
return result
}