golang常用代码片段--定制化config组件

• 使用ini.v1配合fsnotify实现：
  1 解析ini配置文件
  2 监听配置文件的变化热更新配置

import (
    "github.com/fsnotify/fsnotify"
    "github.com/sirupsen/logrus"
    "gopkg.in/ini.v1"
    "io/ioutil"
)

var iniConf *ini.File

const confPath = "main.ini"

func init() {
    var err error
    iniConf, err = ini.Load(confPath)
    if err != nil {
        logrus.Panicf("load conf error: [%s]", err)
    }
    iniConf.BlockMode = false

    // 增加热更新能力
    watcher, err := fsnotify.NewWatcher()
    if err != nil {
        logrus.Panicf("new watcher error: [%s]", err)
    }
    go func() {
        for {
            select {
            case event := <-watcher.Events:
                if event.Op&fsnotify.Write == fsnotify.Write {
                    bytes, err := ioutil.ReadFile(confPath)
                    if err != nil {
                        logrus.Errorf("read conf error: [%s]", err)
                        break
                    }
                    logrus.Infof("modified conf file:%s", string(bytes))
                    newConf, err := ini.Load(confPath)
                    if err != nil {
                        logrus.Errorf("reload conf error: [%s]", err)
                        break
                    }
                    newConf.BlockMode = false
                    iniConf = newConf
                }
            case err := <-watcher.Errors:
                logrus.Errorf("watch conf file error: [%s]", err)
            }
        }
    }()
    if err := watcher.Add(confPath); err != nil {
        logrus.Panicf("add watcher file error: [%s]", err)
    }
}

func GetString(section, key, defaultValue string) string {
    return iniConf.Section(section).Key(key).MustString(defaultValue)
}

func GetInt(section, key string, defaultValue int) int {
    return iniConf.Section(section).Key(key).MustInt(defaultValue)
}

func GetInt64(section, key string, defaultValue int64) int64 {
    return iniConf.Section(section).Key(key).MustInt64(defaultValue)
}

func GetFloat64(section, key string, defaultValue float64) float64 {
    return iniConf.Section(section).Key(key).MustFloat64(defaultValue)
}