lego/platform/config/env/env.go

136 lines
3.2 KiB
Go

package env
import (
"errors"
"fmt"
"os"
"strconv"
"strings"
"time"
)
// Get environment variables
func Get(names ...string) (map[string]string, error) {
values := map[string]string{}
var missingEnvVars []string
for _, envVar := range names {
value := os.Getenv(envVar)
if value == "" {
missingEnvVars = append(missingEnvVars, envVar)
}
values[envVar] = value
}
if len(missingEnvVars) > 0 {
return nil, fmt.Errorf("some credentials information are missing: %s", strings.Join(missingEnvVars, ","))
}
return values, nil
}
// GetWithFallback Get environment variable values
// The first name in each group is use as key in the result map
//
// // LEGO_ONE="ONE"
// // LEGO_TWO="TWO"
// env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"})
// // => "LEGO_ONE" = "ONE"
//
// ----
//
// // LEGO_ONE=""
// // LEGO_TWO="TWO"
// env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"})
// // => "LEGO_ONE" = "TWO"
//
// ----
//
// // LEGO_ONE=""
// // LEGO_TWO=""
// env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"})
// // => error
//
func GetWithFallback(groups ...[]string) (map[string]string, error) {
values := map[string]string{}
var missingEnvVars []string
for _, names := range groups {
if len(names) == 0 {
return nil, errors.New("undefined environment variable names")
}
value, envVar := getOneWithFallback(names[0], names[1:]...)
if len(value) == 0 {
missingEnvVars = append(missingEnvVars, envVar)
continue
}
values[envVar] = value
}
if len(missingEnvVars) > 0 {
return nil, fmt.Errorf("some credentials information are missing: %s", strings.Join(missingEnvVars, ","))
}
return values, nil
}
func getOneWithFallback(main string, names ...string) (string, string) {
value := os.Getenv(main)
if len(value) > 0 {
return value, main
}
for _, name := range names {
value := os.Getenv(name)
if len(value) > 0 {
return value, main
}
}
return "", main
}
// GetOrDefaultInt returns the given environment variable value as an integer.
// Returns the default if the envvar cannot be coopered to an int, or is not found.
func GetOrDefaultInt(envVar string, defaultValue int) int {
v, err := strconv.Atoi(os.Getenv(envVar))
if err != nil {
return defaultValue
}
return v
}
// GetOrDefaultSecond returns the given environment variable value as an time.Duration (second).
// Returns the default if the envvar cannot be coopered to an int, or is not found.
func GetOrDefaultSecond(envVar string, defaultValue time.Duration) time.Duration {
v := GetOrDefaultInt(envVar, -1)
if v < 0 {
return defaultValue
}
return time.Duration(v) * time.Second
}
// GetOrDefaultString returns the given environment variable value as a string.
// Returns the default if the envvar cannot be find.
func GetOrDefaultString(envVar string, defaultValue string) string {
v := os.Getenv(envVar)
if len(v) == 0 {
return defaultValue
}
return v
}
// GetOrDefaultBool returns the given environment variable value as a boolean.
// Returns the default if the envvar cannot be coopered to a boolean, or is not found.
func GetOrDefaultBool(envVar string, defaultValue bool) bool {
v, err := strconv.ParseBool(os.Getenv(envVar))
if err != nil {
return defaultValue
}
return v
}