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file.go
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file.go
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package multiconfig
import (
"encoding/json"
"errors"
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/BurntSushi/toml"
yaml "gopkg.in/yaml.v2"
)
var (
// ErrSourceNotSet states that neither the path or the reader is set on the loader
ErrSourceNotSet = errors.New("config path or reader is not set")
// ErrFileNotFound states that given file is not exists
ErrFileNotFound = errors.New("config file not found")
)
// TOMLLoader satisifies the loader interface. It loads the configuration from
// the given toml file or Reader.
type TOMLLoader struct {
Path string
Reader io.Reader
}
// Load loads the source into the config defined by struct s
// Defaults to using the Reader if provided, otherwise tries to read from the
// file
func (t *TOMLLoader) Load(s interface{}) error {
var r io.Reader
if t.Reader != nil {
r = t.Reader
} else if t.Path != "" {
file, err := getConfig(t.Path)
if err != nil {
return err
}
defer file.Close()
r = file
} else {
return ErrSourceNotSet
}
if _, err := toml.DecodeReader(r, s); err != nil {
return err
}
return nil
}
// JSONLoader satisifies the loader interface. It loads the configuration from
// the given json file or Reader.
type JSONLoader struct {
Path string
Reader io.Reader
}
// Load loads the source into the config defined by struct s.
// Defaults to using the Reader if provided, otherwise tries to read from the
// file
func (j *JSONLoader) Load(s interface{}) error {
var r io.Reader
if j.Reader != nil {
r = j.Reader
} else if j.Path != "" {
file, err := getConfig(j.Path)
if err != nil {
return err
}
defer file.Close()
r = file
} else {
return ErrSourceNotSet
}
return json.NewDecoder(r).Decode(s)
}
// YAMLLoader satisifies the loader interface. It loads the configuration from
// the given yaml file.
type YAMLLoader struct {
Path string
Reader io.Reader
}
// Load loads the source into the config defined by struct s.
// Defaults to using the Reader if provided, otherwise tries to read from the
// file
func (y *YAMLLoader) Load(s interface{}) error {
var r io.Reader
if y.Reader != nil {
r = y.Reader
} else if y.Path != "" {
file, err := getConfig(y.Path)
if err != nil {
return err
}
defer file.Close()
r = file
} else {
return ErrSourceNotSet
}
data, err := ioutil.ReadAll(r)
if err != nil {
return err
}
return yaml.Unmarshal(data, s)
}
func getConfig(path string) (*os.File, error) {
pwd, err := os.Getwd()
if err != nil {
return nil, err
}
configPath := path
if !filepath.IsAbs(path) {
configPath = filepath.Join(pwd, path)
}
// check if file with combined path is exists(relative path)
if _, err := os.Stat(configPath); !os.IsNotExist(err) {
return os.Open(configPath)
}
f, err := os.Open(path)
if os.IsNotExist(err) {
return nil, ErrFileNotFound
}
return f, err
}