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config_disk_persistor.go
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/
config_disk_persistor.go
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package configuration
import (
"io/ioutil"
"os"
)
const (
filePermissions = 0600
dirPermissions = 0700
)
//go:generate counterfeiter -o fakes/fake_persistor.go . Persistor
type Persistor interface {
Delete()
Exists() bool
Load(DataInterface) error
Save(DataInterface) error
}
type DataInterface interface {
JsonMarshalV3() ([]byte, error)
JsonUnmarshalV3([]byte) error
}
type DiskPersistor struct {
filePath string
}
func NewDiskPersistor(path string) (dp DiskPersistor) {
return DiskPersistor{
filePath: path,
}
}
func (dp DiskPersistor) Exists() bool {
_, err := os.Stat(dp.filePath)
if err != nil && !os.IsExist(err) {
return false
}
return true
}
func (dp DiskPersistor) Delete() {
os.Remove(dp.filePath)
}
func (dp DiskPersistor) Load(data DataInterface) error {
err := dp.read(data)
if os.IsPermission(err) {
return err
}
if err != nil {
err = dp.write(data)
}
return err
}
func (dp DiskPersistor) Save(data DataInterface) (err error) {
return dp.write(data)
}
func (dp DiskPersistor) read(data DataInterface) error {
dp.makeDirectory()
jsonBytes, err := ioutil.ReadFile(dp.filePath)
if err != nil {
return err
}
err = data.JsonUnmarshalV3(jsonBytes)
return err
}
func (dp DiskPersistor) write(data DataInterface) error {
bytes, err := data.JsonMarshalV3()
if err != nil {
return err
}
err = ioutil.WriteFile(dp.filePath, bytes, filePermissions)
return err
}