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env.go
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env.go
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package env
import (
"os"
"strconv"
"strings"
"time"
)
// GetenvWithDefault returns a value from an environment variable defined by
// key. If key isn't set in the environment, returns defaultValue
func GetenvWithDefault(key string, defaultValue string) string {
vars := os.Environ()
for _, v := range vars {
pieces := strings.SplitN(v, "=", 2)
if pieces[0] == key {
return pieces[1]
}
}
return defaultValue
}
// GetenvBoolWithDefault returns a value from an environment variable defined by
// key. If key isn't set in the environment, returns defaultValue
func GetenvBoolWithDefault(key string, defaultValue bool) bool {
vars := os.Environ()
for _, v := range vars {
pieces := strings.SplitN(v, "=", 2)
if pieces[0] == key {
result, err := strconv.ParseBool(strings.ToLower(pieces[1]))
if err != nil {
return defaultValue
}
return result
}
}
return defaultValue
}
// GetenvIntWithDefault returns a value from an environment variable defined by
// key. If key isn't set in the environment, or doesn't parse as an int,
// returns defaultValue
func GetenvIntWithDefault(key string, defaultValue int) int {
vars := os.Environ()
for _, v := range vars {
pieces := strings.SplitN(v, "=", 2)
if pieces[0] == key {
val, err := strconv.Atoi(pieces[1])
if err != nil {
return defaultValue
}
return val
}
}
return defaultValue
}
// GetenvDurationWithDefault returns a value from an environment variable defined by
// key. If key isn't set in the environment, or doesn't parse as a time.Duration,
// returns defaultValue
func GetenvDurationWithDefault(key string, defaultValue time.Duration) time.Duration {
vars := os.Environ()
for _, v := range vars {
pieces := strings.SplitN(v, "=", 2)
if pieces[0] == key {
val, err := time.ParseDuration(pieces[1])
if err != nil {
return defaultValue
}
return val
}
}
return defaultValue
}
// GetenvFloat64WithDefault returns a value from an environment variable defined by
// key. If key isn't set in the environment, or doesn't parse as a float64,
// returns defaultValue
func GetenvFloat64WithDefault(key string, defaultValue float64) float64 {
vars := os.Environ()
for _, v := range vars {
pieces := strings.SplitN(v, "=", 2)
if pieces[0] == key {
val, err := strconv.ParseFloat(pieces[1], 64)
if err != nil {
return defaultValue
}
return val
}
}
return defaultValue
}