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Beego/config/json.go
2014-07-17 16:48:10 +08:00

170 lines
3.8 KiB
Go

// Beego (http://beego.me/)
//
// @description beego is an open-source, high-performance web framework for the Go programming language.
//
// @link http://github.com/astaxie/beego for the canonical source repository
//
// @license http://github.com/astaxie/beego/blob/master/LICENSE
//
// @authors astaxie
package config
import (
"encoding/json"
"errors"
"io/ioutil"
"os"
"strings"
"sync"
)
// JsonConfig is a json config parser and implements Config interface.
type JsonConfig struct {
}
// Parse returns a ConfigContainer with parsed json config map.
func (js *JsonConfig) Parse(filename string) (ConfigContainer, error) {
file, err := os.Open(filename)
if err != nil {
return nil, err
}
defer file.Close()
content, err := ioutil.ReadAll(file)
if err != nil {
return nil, err
}
x := &JsonConfigContainer{
data: make(map[string]interface{}),
}
err = json.Unmarshal(content, &x.data)
if err != nil {
var wrappingArray []interface{}
err2 := json.Unmarshal(content, &wrappingArray)
if err2 != nil {
return nil, err
}
x.data["rootArray"] = wrappingArray
}
return x, nil
}
// A Config represents the json configuration.
// Only when get value, support key as section:name type.
type JsonConfigContainer struct {
data map[string]interface{}
sync.RWMutex
}
// Bool returns the boolean value for a given key.
func (c *JsonConfigContainer) Bool(key string) (bool, error) {
val := c.getData(key)
if val != nil {
if v, ok := val.(bool); ok {
return v, nil
}
return false, errors.New("not bool value")
}
return false, errors.New("not exist key:" + key)
}
// Int returns the integer value for a given key.
func (c *JsonConfigContainer) Int(key string) (int, error) {
val := c.getData(key)
if val != nil {
if v, ok := val.(float64); ok {
return int(v), nil
}
return 0, errors.New("not int value")
}
return 0, errors.New("not exist key:" + key)
}
// Int64 returns the int64 value for a given key.
func (c *JsonConfigContainer) Int64(key string) (int64, error) {
val := c.getData(key)
if val != nil {
if v, ok := val.(float64); ok {
return int64(v), nil
}
return 0, errors.New("not int64 value")
}
return 0, errors.New("not exist key:" + key)
}
// Float returns the float value for a given key.
func (c *JsonConfigContainer) Float(key string) (float64, error) {
val := c.getData(key)
if val != nil {
if v, ok := val.(float64); ok {
return v, nil
}
return 0.0, errors.New("not float64 value")
}
return 0.0, errors.New("not exist key:" + key)
}
// String returns the string value for a given key.
func (c *JsonConfigContainer) String(key string) string {
val := c.getData(key)
if val != nil {
if v, ok := val.(string); ok {
return v
}
}
return ""
}
// Strings returns the []string value for a given key.
func (c *JsonConfigContainer) Strings(key string) []string {
return strings.Split(c.String(key), ";")
}
// WriteValue writes a new value for key.
func (c *JsonConfigContainer) 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 *JsonConfigContainer) DIY(key string) (v interface{}, err error) {
val := c.getData(key)
if val != nil {
return val, nil
}
return nil, errors.New("not exist key")
}
// section.key or key
func (c *JsonConfigContainer) getData(key string) interface{} {
c.RLock()
defer c.RUnlock()
if len(key) == 0 {
return nil
}
sectionKey := strings.Split(key, "::")
if len(sectionKey) >= 2 {
curValue, ok := c.data[sectionKey[0]]
if !ok {
return nil
}
for _, key := range sectionKey[1:] {
if v, ok := curValue.(map[string]interface{}); ok {
if curValue, ok = v[key]; !ok {
return nil
}
}
}
return curValue
}
if v, ok := c.data[key]; ok {
return v
}
return nil
}
func init() {
Register("json", &JsonConfig{})
}