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/*
Package config is a simple tool to handle key-value config, like Redis's configuration:
# commet
key = value
*/
package config
import (
"errors"
"fmt"
"strconv"
"strings"
)
var (
ErrNil = errors.New("nil value")
)
type Config struct {
Values map[string]string
}
func NewConfig() *Config {
c := &Config{}
c.Values = make(map[string]string)
return c
}
/*
bool: true, false, 0, 1, or ""
*/
func (c *Config) GetBool(key string) (bool, error) {
v, err := c.GetString(key)
if err != nil {
return false, err
}
v = strings.ToLower(v)
switch v {
case "true", "1":
return true, nil
case "false", "0", "":
return false, nil
default:
return false, fmt.Errorf("invalid bool format %s", v)
}
}
/*
int may be pure number or below format:
# 1k => 1000 bytes
# 1kb => 1024 bytes
# 1m => 1000000 bytes
# 1mb => 1024*1024 bytes
# 1g => 1000000000 bytes
# 1gb => 1024*1024*1024 bytes
*/
func (c *Config) GetInt64(key string) (int64, error) {
v, err := c.GetString(key)
if err != nil {
return 0, err
}
if len(v) == 0 {
return 0, ErrNil
}
var scale int64 = 1
v = strings.ToLower(v)
var b bool = false
if v[len(v)-1] == 'b' {
v = v[0 : len(v)-1]
b = true
}
if len(v) == 0 {
return 0, fmt.Errorf("invalid number format %s", v)
}
switch v[len(v)-1] {
case 'k':
v = v[0 : len(v)-1]
if b {
scale = 1024
} else {
scale = 1000
}
break
case 'm':
v = v[0 : len(v)-1]
if b {
scale = 1024 * 1024
} else {
scale = 1000 * 1000
}
case 'g':
v = v[0 : len(v)-1]
if b {
scale = 1024 * 1024 * 1024
} else {
scale = 1000 * 1000 * 1000
}
}
var n int64
n, err = strconv.ParseInt(v, 10, 64)
if err != nil {
return 0, err
}
return n * scale, nil
}
func (c *Config) GetUint64(key string) (uint64, error) {
v, err := c.GetInt64(key)
if v < 0 {
return 0, fmt.Errorf("negative number %d", v)
}
return uint64(v), err
}
func (c *Config) GetInt(key string) (int, error) {
v, err := c.GetInt64(key)
return int(v), err
}
func (c *Config) GetString(key string) (string, error) {
v, ok := c.Values[key]
if !ok {
return "", ErrNil
} else {
return v, nil
}
}
func (c *Config) SetString(key string, value string) {
c.Values[key] = value
}
func (c *Config) SetInt64(key string, n int64) {
c.Values[key] = strconv.FormatInt(n, 10)
}
func (c *Config) SetUint64(key string, n uint64) {
c.Values[key] = strconv.FormatUint(n, 10)
}
func (c *Config) SetInt(key string, n int) {
c.SetInt64(key, int64(n))
}
func (c *Config) SetBool(key string, v bool) {
if v {
c.Values[key] = "true"
} else {
c.Values[key] = "false"
}
}
|
