/
config.go
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/
config.go
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// 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 config is used to parse config.
// Usage:
// import "github.com/beego/beego/v2/core/config"
// Examples.
//
// cnf, err := config.NewConfig("ini", "config.conf")
//
// cnf APIS:
//
// cnf.Set(key, val string) error
// cnf.String(key string) string
// cnf.Strings(key string) []string
// cnf.Int(key string) (int, error)
// cnf.Int64(key string) (int64, error)
// cnf.Bool(key string) (bool, error)
// cnf.Float(key string) (float64, error)
// cnf.DefaultString(key string, defaultVal string) string
// cnf.DefaultStrings(key string, defaultVal []string) []string
// cnf.DefaultInt(key string, defaultVal int) int
// cnf.DefaultInt64(key string, defaultVal int64) int64
// cnf.DefaultBool(key string, defaultVal bool) bool
// cnf.DefaultFloat(key string, defaultVal float64) float64
// cnf.DIY(key string) (interface{}, error)
// cnf.GetSection(section string) (map[string]string, error)
// cnf.SaveConfigFile(filename string) error
// More docs http://beego.vip/docs/module/config.md
package config
import (
"context"
"errors"
"fmt"
"os"
"reflect"
"strconv"
"strings"
"time"
)
// Configer defines how to get and set value from configuration raw data.
type Configer interface {
// Set support section::key type in given key when using ini type.
Set(key, val string) error
// String support section::key type in key string when using ini and json type; Int,Int64,Bool,Float,DIY are same.
String(key string) (string, error)
// Strings get string slice
Strings(key string) ([]string, error)
Int(key string) (int, error)
Int64(key string) (int64, error)
Bool(key string) (bool, error)
Float(key string) (float64, error)
// DefaultString support section::key type in key string when using ini and json type; Int,Int64,Bool,Float,DIY are same.
DefaultString(key string, defaultVal string) string
// DefaultStrings get string slice
DefaultStrings(key string, defaultVal []string) []string
DefaultInt(key string, defaultVal int) int
DefaultInt64(key string, defaultVal int64) int64
DefaultBool(key string, defaultVal bool) bool
DefaultFloat(key string, defaultVal float64) float64
// DIY return the original value
DIY(key string) (interface{}, error)
GetSection(section string) (map[string]string, error)
Unmarshaler(prefix string, obj interface{}, opt ...DecodeOption) error
Sub(key string) (Configer, error)
OnChange(key string, fn func(value string))
SaveConfigFile(filename string) error
}
type BaseConfiger struct {
// The reader should support key like "a.b.c"
reader func(ctx context.Context, key string) (string, error)
}
func NewBaseConfiger(reader func(ctx context.Context, key string) (string, error)) BaseConfiger {
return BaseConfiger{
reader: reader,
}
}
func (c *BaseConfiger) Int(key string) (int, error) {
res, err := c.reader(context.TODO(), key)
if err != nil {
return 0, err
}
return strconv.Atoi(res)
}
func (c *BaseConfiger) Int64(key string) (int64, error) {
res, err := c.reader(context.TODO(), key)
if err != nil {
return 0, err
}
return strconv.ParseInt(res, 10, 64)
}
func (c *BaseConfiger) Bool(key string) (bool, error) {
res, err := c.reader(context.TODO(), key)
if err != nil {
return false, err
}
return ParseBool(res)
}
func (c *BaseConfiger) Float(key string) (float64, error) {
res, err := c.reader(context.TODO(), key)
if err != nil {
return 0, err
}
return strconv.ParseFloat(res, 64)
}
// DefaultString returns the string value for a given key.
// if err != nil or value is empty return defaultval
func (c *BaseConfiger) DefaultString(key string, defaultVal string) string {
if res, err := c.String(key); res != "" && err == nil {
return res
}
return defaultVal
}
// DefaultStrings returns the []string value for a given key.
// if err != nil return defaultval
func (c *BaseConfiger) DefaultStrings(key string, defaultVal []string) []string {
if res, err := c.Strings(key); len(res) > 0 && err == nil {
return res
}
return defaultVal
}
func (c *BaseConfiger) DefaultInt(key string, defaultVal int) int {
if res, err := c.Int(key); err == nil {
return res
}
return defaultVal
}
func (c *BaseConfiger) DefaultInt64(key string, defaultVal int64) int64 {
if res, err := c.Int64(key); err == nil {
return res
}
return defaultVal
}
func (c *BaseConfiger) DefaultBool(key string, defaultVal bool) bool {
if res, err := c.Bool(key); err == nil {
return res
}
return defaultVal
}
func (c *BaseConfiger) DefaultFloat(key string, defaultVal float64) float64 {
if res, err := c.Float(key); err == nil {
return res
}
return defaultVal
}
func (c *BaseConfiger) String(key string) (string, error) {
return c.reader(context.TODO(), key)
}
// Strings returns the []string value for a given key.
// Return nil if config value does not exist or is empty.
func (c *BaseConfiger) Strings(key string) ([]string, error) {
res, err := c.String(key)
if err != nil || res == "" {
return nil, err
}
return strings.Split(res, ";"), nil
}
func (*BaseConfiger) Sub(string) (Configer, error) {
return nil, errors.New("unsupported operation")
}
func (*BaseConfiger) OnChange(_ string, _ func(value string)) {
// do nothing
}
// Config is the adapter interface for parsing config file to get raw data to Configer.
type Config interface {
Parse(key string) (Configer, error)
ParseData(data []byte) (Configer, error)
}
var adapters = make(map[string]Config)
// Register makes a config adapter available by the adapter name.
// If Register is called twice with the same name or if driver is nil,
// it panics.
func Register(name string, adapter Config) {
if adapter == nil {
panic("config: Register adapter is nil")
}
if _, ok := adapters[name]; ok {
panic("config: Register called twice for adapter " + name)
}
adapters[name] = adapter
}
// NewConfig adapterName is ini/json/xml/yaml.
// filename is the config file path.
func NewConfig(adapterName, filename string) (Configer, error) {
adapter, ok := adapters[adapterName]
if !ok {
return nil, fmt.Errorf("config: unknown adaptername %q (forgotten import?)", adapterName)
}
return adapter.Parse(filename)
}
// NewConfigData adapterName is ini/json/xml/yaml.
// data is the config data.
func NewConfigData(adapterName string, data []byte) (Configer, error) {
adapter, ok := adapters[adapterName]
if !ok {
return nil, fmt.Errorf("config: unknown adaptername %q (forgotten import?)", adapterName)
}
return adapter.ParseData(data)
}
// ExpandValueEnvForMap convert all string value with environment variable.
func ExpandValueEnvForMap(m map[string]interface{}) map[string]interface{} {
for k, v := range m {
switch value := v.(type) {
case string:
m[k] = ExpandValueEnv(value)
case map[string]interface{}:
m[k] = ExpandValueEnvForMap(value)
case map[string]string:
for k2, v2 := range value {
value[k2] = ExpandValueEnv(v2)
}
m[k] = value
case map[interface{}]interface{}:
tmp := make(map[string]interface{}, len(value))
for k2, v2 := range value {
tmp[k2.(string)] = v2
}
m[k] = ExpandValueEnvForMap(tmp)
}
}
return m
}
// ExpandValueEnv returns value of convert with environment variable.
//
// Return environment variable if value start with "${" and end with "}".
// Return default value if environment variable is empty or not exist.
//
// It accept value formats "${env}" , "${env||}}" , "${env||defaultValue}" , "defaultvalue".
// Examples:
// v1 := config.ExpandValueEnv("${GOPATH}") // return the GOPATH environment variable.
// v2 := config.ExpandValueEnv("${GOAsta||/usr/local/go}") // return the default value "/usr/local/go/".
// v3 := config.ExpandValueEnv("Astaxie") // return the value "Astaxie".
func ExpandValueEnv(value string) (realValue string) {
realValue = value
vLen := len(value)
// 3 = ${}
if vLen < 3 {
return
}
// Need start with "${" and end with "}", then return.
if value[0] != '$' || value[1] != '{' || value[vLen-1] != '}' {
return
}
key := ""
defaultV := ""
// value start with "${"
for i := 2; i < vLen; i++ {
if value[i] == '|' && (i+1 < vLen && value[i+1] == '|') {
key = value[2:i]
defaultV = value[i+2 : vLen-1] // other string is default value.
break
} else if value[i] == '}' {
key = value[2:i]
break
}
}
realValue = os.Getenv(key)
if realValue == "" {
realValue = defaultV
}
return
}
// ParseBool returns the boolean value represented by the string.
//
// It accepts 1, 1.0, t, T, TRUE, true, True, YES, yes, Yes,Y, y, ON, on, On,
// 0, 0.0, f, F, FALSE, false, False, NO, no, No, N,n, OFF, off, Off.
// Any other value returns an error.
func ParseBool(val interface{}) (value bool, err error) {
if val != nil {
switch v := val.(type) {
case bool:
return v, nil
case string:
switch v {
case "1", "t", "T", "true", "TRUE", "True", "YES", "yes", "Yes", "Y", "y", "ON", "on", "On":
return true, nil
case "0", "f", "F", "false", "FALSE", "False", "NO", "no", "No", "N", "n", "OFF", "off", "Off":
return false, nil
}
case int8, int32, int64:
strV := fmt.Sprintf("%d", v)
if strV == "1" {
return true, nil
} else if strV == "0" {
return false, nil
}
case float64:
if v == 1.0 {
return true, nil
} else if v == 0.0 {
return false, nil
}
}
return false, fmt.Errorf("parsing %q: invalid syntax", val)
}
return false, fmt.Errorf("parsing <nil>: invalid syntax")
}
// ToString converts values of any type to string.
func ToString(x interface{}) string {
switch y := x.(type) {
// Handle dates with special logic
// This needs to come above the fmt.Stringer
// test since time.Time's have a .String()
// method
case time.Time:
return y.Format("A Monday")
// Handle type string
case string:
return y
// Handle type with .String() method
case fmt.Stringer:
return y.String()
// Handle type with .Error() method
case error:
return y.Error()
}
// Handle named string type
if v := reflect.ValueOf(x); v.Kind() == reflect.String {
return v.String()
}
// Fallback to fmt package for anything else like numeric types
return fmt.Sprint(x)
}
type DecodeOption func(options decodeOptions)
type decodeOptions struct{}