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types.go
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types.go
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package env
import (
"fmt"
"os"
"regexp"
"strings"
)
// evnVarRegex matches a variable surrounded by curly braces with leading dollar sign.
// ex: ${MY_VAR}
var envVarRegex = regexp.MustCompile(`\${[A-Z]+[A-Z1-9_]*}`)
// ErrEnvVar corresponds with a missing environment variable
type ErrEnvVar string
func (e ErrEnvVar) Error() string {
return fmt.Sprintf("environment variable %q not found", string(e))
}
// ErrType corresponds with an incorrect type passed to UnmarshalTOML
type ErrType struct {
v interface{}
}
func (te ErrType) Error() string {
return fmt.Sprintf("type %t could not be converted", te.v)
}
// replaceEnvVars replaces environment variable placeholders in reader stream with values
func replaceEnvVar(in string) (string, error) {
// loop through all environment variable matches
for locs := envVarRegex.FindStringIndex(in); locs != nil; locs = envVarRegex.FindStringIndex(in) {
// extract match from the input string
match := in[locs[0]:locs[1]]
// trim the leading '${' and trailing '}'
varName := match[2 : len(match)-1]
// get env var
envVar, ok := os.LookupEnv(varName)
if !ok {
return "", ErrEnvVar(varName)
}
// update the input string with the env values
in = strings.Replace(in, match, envVar, -1)
}
return in, nil
}
//TODO(@ear7h): implement UnmarshalJSON for types
type Bool bool
func BoolPtr(v Bool) *Bool {
return &v
}
func (t *Bool) UnmarshalTOML(v interface{}) error {
var b *bool
var err error
b, err = ParseBool(v)
if err != nil {
return err
}
*t = Bool(*b)
return nil
}
type String string
func StringPtr(v String) *String {
return &v
}
func (t *String) UnmarshalTOML(v interface{}) error {
var s *string
var err error
s, err = ParseString(v)
if err != nil {
return err
}
*t = String(*s)
return nil
}
type Int int
func IntPtr(v Int) *Int {
return &v
}
func (t *Int) UnmarshalTOML(v interface{}) error {
var i *int
var err error
i, err = ParseInt(v)
if err != nil {
return err
}
*t = Int(*i)
return nil
}
type Uint uint
func UintPtr(v Uint) *Uint {
return &v
}
func (t *Uint) UnmarshalTOML(v interface{}) error {
var ui *uint
var err error
ui, err = ParseUint(v)
if err != nil {
return err
}
*t = Uint(*ui)
return nil
}
type Float float64
func FloatPtr(v Float) *Float {
return &v
}
func (t *Float) UnmarshalTOML(v interface{}) error {
var f *float64
var err error
f, err = ParseFloat(v)
if err != nil {
return err
}
*t = Float(*f)
return nil
}