harbor/vendor/github.com/astaxie/beego/config/yaml/yaml.go

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2016-02-01 12:59:10 +01:00
// Copyright 2014 beego Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package yaml for config provider
//
// depend on github.com/beego/goyaml2
//
// go install github.com/beego/goyaml2
//
// Usage:
// import(
// _ "github.com/astaxie/beego/config/yaml"
// "github.com/astaxie/beego/config"
// )
//
// cnf, err := config.NewConfig("yaml", "config.yaml")
//
// more docs http://beego.me/docs/module/config.md
package yaml
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"os"
"path"
"strings"
"sync"
"time"
"github.com/astaxie/beego/config"
"github.com/beego/goyaml2"
)
// Config is a yaml config parser and implements Config interface.
type Config struct{}
// Parse returns a ConfigContainer with parsed yaml config map.
func (yaml *Config) Parse(filename string) (y config.Configer, err error) {
cnf, err := ReadYmlReader(filename)
if err != nil {
return
}
y = &ConfigContainer{
data: cnf,
}
return
}
// ParseData parse yaml data
func (yaml *Config) ParseData(data []byte) (config.Configer, error) {
// Save memory data to temporary file
tmpName := path.Join(os.TempDir(), "beego", fmt.Sprintf("%d", time.Now().Nanosecond()))
os.MkdirAll(path.Dir(tmpName), os.ModePerm)
if err := ioutil.WriteFile(tmpName, data, 0655); err != nil {
return nil, err
}
return yaml.Parse(tmpName)
}
// ReadYmlReader Read yaml file to map.
// if json like, use json package, unless goyaml2 package.
func ReadYmlReader(path string) (cnf map[string]interface{}, err error) {
f, err := os.Open(path)
if err != nil {
return
}
defer f.Close()
buf, err := ioutil.ReadAll(f)
if err != nil || len(buf) < 3 {
return
}
if string(buf[0:1]) == "{" {
log.Println("Look like a Json, try json umarshal")
err = json.Unmarshal(buf, &cnf)
if err == nil {
log.Println("It is Json Map")
return
}
}
data, err := goyaml2.Read(bytes.NewBuffer(buf))
if err != nil {
log.Println("Goyaml2 ERR>", string(buf), err)
return
}
if data == nil {
log.Println("Goyaml2 output nil? Pls report bug\n" + string(buf))
return
}
cnf, ok := data.(map[string]interface{})
if !ok {
log.Println("Not a Map? >> ", string(buf), data)
cnf = nil
}
return
}
// ConfigContainer A Config represents the yaml configuration.
type ConfigContainer struct {
data map[string]interface{}
sync.Mutex
}
// Bool returns the boolean value for a given key.
func (c *ConfigContainer) Bool(key string) (bool, error) {
if v, ok := c.data[key].(bool); ok {
return v, nil
}
return false, errors.New("not bool value")
}
// DefaultBool return the bool value if has no error
// otherwise return the defaultval
func (c *ConfigContainer) DefaultBool(key string, defaultval bool) bool {
v, err := c.Bool(key)
if err != nil {
return defaultval
}
return v
}
// Int returns the integer value for a given key.
func (c *ConfigContainer) Int(key string) (int, error) {
if v, ok := c.data[key].(int64); ok {
return int(v), nil
}
return 0, errors.New("not int value")
}
// DefaultInt returns the integer value for a given key.
// if err != nil return defaltval
func (c *ConfigContainer) DefaultInt(key string, defaultval int) int {
v, err := c.Int(key)
if err != nil {
return defaultval
}
return v
}
// Int64 returns the int64 value for a given key.
func (c *ConfigContainer) Int64(key string) (int64, error) {
if v, ok := c.data[key].(int64); ok {
return v, nil
}
return 0, errors.New("not bool value")
}
// DefaultInt64 returns the int64 value for a given key.
// if err != nil return defaltval
func (c *ConfigContainer) DefaultInt64(key string, defaultval int64) int64 {
v, err := c.Int64(key)
if err != nil {
return defaultval
}
return v
}
// Float returns the float value for a given key.
func (c *ConfigContainer) Float(key string) (float64, error) {
if v, ok := c.data[key].(float64); ok {
return v, nil
}
return 0.0, errors.New("not float64 value")
}
// DefaultFloat returns the float64 value for a given key.
// if err != nil return defaltval
func (c *ConfigContainer) DefaultFloat(key string, defaultval float64) float64 {
v, err := c.Float(key)
if err != nil {
return defaultval
}
return v
}
// String returns the string value for a given key.
func (c *ConfigContainer) String(key string) string {
if v, ok := c.data[key].(string); ok {
return v
}
return ""
}
// DefaultString returns the string value for a given key.
// if err != nil return defaltval
func (c *ConfigContainer) DefaultString(key string, defaultval string) string {
v := c.String(key)
if v == "" {
return defaultval
}
return v
}
// Strings returns the []string value for a given key.
func (c *ConfigContainer) Strings(key string) []string {
return strings.Split(c.String(key), ";")
}
// DefaultStrings returns the []string value for a given key.
// if err != nil return defaltval
func (c *ConfigContainer) DefaultStrings(key string, defaultval []string) []string {
v := c.Strings(key)
if len(v) == 0 {
return defaultval
}
return v
}
// GetSection returns map for the given section
func (c *ConfigContainer) GetSection(section string) (map[string]string, error) {
v, ok := c.data[section]
if ok {
return v.(map[string]string), nil
}
return nil, errors.New("not exist setction")
}
// SaveConfigFile save the config into file
func (c *ConfigContainer) SaveConfigFile(filename string) (err error) {
// Write configuration file by filename.
f, err := os.Create(filename)
if err != nil {
return err
}
defer f.Close()
err = goyaml2.Write(f, c.data)
return err
}
// Set writes a new value for key.
func (c *ConfigContainer) Set(key, val string) error {
c.Lock()
defer c.Unlock()
c.data[key] = val
return nil
}
// DIY returns the raw value by a given key.
func (c *ConfigContainer) DIY(key string) (v interface{}, err error) {
if v, ok := c.data[key]; ok {
return v, nil
}
return nil, errors.New("not exist key")
}
func init() {
config.Register("yaml", &Config{})
}