env allows parsing environment values directly to and from native Go types and any custom types that implement the encoding.TextUnmarshaler and/or encoding.TextMarshaler interfaces.
go get github.com/lucafmarques/env
env works with the following native types out of the box:
boolstringint, variants and aliasesuint, variants and aliasesfloat32andfloat64complex64andcomplex128[]TwhereTis any of the above typesencoding.TextUnmarshaler
Custom types must implement encoding.TextUnmarshaler and/or encoding.TextMarshaler to work with env.
native.go |
custom.go |
|---|---|
package main
import (
"time"
"github.com/lucafmarques/env"
)
func main() {
// MustGet panics if the env isn't set
intV := env.MustGet[int]("INTEGER")
strV := env.MustGet[string]("STRING")
timeV, err := env.Get[time.Time]("TIME")
// ...
env.MustSet("COMPLEX", complex128(420))
err = env.Set("UINT32", uint32(69))
} |
package main
import (
"bytes"
"fmt"
"github.com/lucafmarques/env"
)
type log struct {
Format string
Level string
}
func (l log) MarshalText() ([]byte, error) {
s := fmt.Sprintf("%s,%s", e.Format, e.Level)
return []byte(s), nil
}
func (l *log) UnmarshalText(d []byte) error {
v := bytes.Split(d, []byte(","))
if len(v) != 2 {
return fmt.Errorf("can't unrmarshal")
}
l.Format = string(v[0])
l.Level = string(v[1])
return nil
}
func main() {
logV := env.MustGet[log]("LOG_FORMAT"))
logV = log{Format: "JSON", Level: "INFO"}
err := env.Set("LOG_FORMAT", logV)
} |