refactor: openpitrix module

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/koding/multiconfig/file.go

@@ -0,0 +1,139 @@
+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
+}