关于go:使用viper解析ini配置文件

在我的项目中，常常应用ini和yaml作为配置文件。

对于ini配置文件，始终应用https://github.com/go-ini/ini这个库来解析配置。次要是因为简略易用并且中文文档反对较好。

对于viper，之前是不反对ini配置的，对于viper为什么不反对ini，官网QA有一段解释

Q: Why not INI files?

A: Ini files are pretty awful. There’s no standard format, and they are hard to validate. Viper is designed to work with JSON, TOML or YAML files. If someone really wants to add this feature, I’d be happy to merge it. It’s easy to specify which formats your application will permit.

看来ini格局始终不受viper待见…

最近翻看viper文档的时候，发现在v1.6.0的版本中曾经增加了对ini的反对，大略体验了下。

轻易找了一个ini配置文件

# possible values : production, development
app_mode = development

[paths]
# Path to where grafana can store temp files, sessions, and the sqlite3 db (if that is used)
data = /home/git/grafana

[server]
# Protocol (http or https)
protocol = "http"

# The http port  to use
http_port = 9999

# Redirect to correct domain if host header does not match domain
# Prevents DNS rebinding attacks
enforce_domain = true

// 指定要解析的配置文件
viper.SetConfigFile("my.ini")
if err := viper.ReadInConfig(); err != nil {
    log.Fatal(err)
}
// 默认section为default
fmt.Printf("app_mode:%v\n", viper.GetString(`default.app_mode`))
fmt.Printf("server.protocol:%v\n", viper.GetString(`server.protocol`))

// 获取所有配置
all := viper.AllSettings()
fmt.Printf("%#v\n", all)

// 解析section到struct
server := struct {
  Protocol      string `mapstructure:"protocol"`
  HttpPort      int    `mapstructure:"http_port"`
  EnforceDomain bool   `mapstructure:"enforce_domain"`
}{}
if err := viper.UnmarshalKey("server", &server); err != nil {
    fmt.Println("ini解析到struct 异样: ", err)
} else {
    fmt.Println("struct: ", server)
}

输入

app_mode:development
server.protocol:http
map[string]interface {}{"default":map[string]interface {}{"app_mode":"development"}, "paths":map[string]interface {}{"data":"/home/git/grafana"}, "server":map[string]interface {}{"enforce_domain":"true", "http_port":"9999", "protocol":"http"}}
struct:  {http 9999 true}

能够看出，对于一些罕用的性能应用起来也是比较简单不便的。

viper中提供如下办法来获取配置

• Get(key string) : interface{}
• GetBool(key string) : bool
• GetFloat64(key string) : float64
• GetInt(key string) : int
• GetIntSlice(key string) : []int
• GetString(key string) : string
• GetStringMap(key string) : map[string]interface{}
• GetStringMapString(key string) : map[string]string
• GetStringSlice(key string) : []string
• GetTime(key string) : time.Time
• GetDuration(key string) : time.Duration
• IsSet(key string) : bool
• AllSettings() : map[string]interface{}

参考

https://github.com/spf13/viper