Go 使用toml配置文件

我们常见的一些配置文件包括，yaml、xml、toml、json和ini。

今天我们就来介绍这个toml配置文件，在go语言中的使用。
toml（Tom’s Obvious， Minimal Language），简约又明显的语言。

使用的包是：github.com/BurntSushi/toml

安装 toml 包

go get github.com/BurntSushi/toml@latest

创建 toml 配置文件

首先，创建一个 TOML 配置文件，例如 config.toml，并在其中存储你的配置信息。以下是一个简单的 TOML 配置文件示例

# This is a TOML document. Boom.

title = "TOML Example"

[owner]
name = "Tom Preston-Werner"
organization = "ABC"
bio = "GitHub Cofounder & CEO\nLikes tater tots and beer."
dob = 1979-05-27T07:32:00Z # First class dates? Why not?

[database]
server = "192.168.1.1"
ports = [ 8001, 8001, 8002 ]
connection_max = 5000
enabled = true

[servers]
  # You can indent as you please. Tabs or spaces. TOML don't care.
  [servers.alpha]
  ip = "10.0.0.1"
  dc = "eqdc10"

  [servers.beta]
  ip = "10.0.0.2"
  dc = "eqdc10"

[clients]
data = [ ["gamma", "delta"], [1, 2],[true, false] ] # just an update to make sure parsers support it

# Line breaks are OK when inside arrays
hosts = [
  "alpha",
  "omega"
]

读取 toml 配置文件

更复杂的示例：https://github.com/BurntSushi/toml/tree/master/_example

package main

import (
	"fmt"
	"time"

	"github.com/BurntSushi/toml"
)

type tomlConfig struct {
	Title   string
	Owner   ownerInfo
	DB      database `toml:"database"`
	Servers map[string]server
	Clients clients
}

type ownerInfo struct {
	Name string    `toml:"name"`
	Org  string    `toml:"organization"`
	Bio  string    `toml:"bio"`
	DOB  time.Time `toml:"bob"`
}

type database struct {
	Server  string `toml:"server"`
	Ports   []int  `toml:"ports"`
	CommMax int64  `toml:"connection_max"`
	Enabled bool   `toml:"enabled"`
}

type server struct {
	IP string `toml:"ip"`
	DC string `toml:"dc"`
}

type clients struct {
	Data  [][]interface{} `toml:"data"`
	Hosts []string        `toml:"hosts"`
}

func readToml() {
	var config tomlConfig
	if _, err := toml.DecodeFile("conf/config.toml", &config); err != nil {
		fmt.Println(err)
		return
	}

	fmt.Printf("Title: %s\n", config.Title)
	fmt.Println()

	fmt.Printf("Owner: %s (%s, %s), Born: %s\n",
		config.Owner.Name, config.Owner.Org, config.Owner.Bio, config.Owner.DOB)
	fmt.Println()

	fmt.Printf("Database: %s %v (Max conn, %d), Enable? %v\n",
		config.DB.Server, config.DB.Ports, config.DB.CommMax, config.DB.Enabled)
	fmt.Println()

	for serverName, server := range config.Servers {
		fmt.Printf("Server: %s (%s, %s)\n", serverName, server.IP, server.DC)
	}
	fmt.Println()

	fmt.Printf("Client data: %v\n", config.Clients.Data)
	fmt.Printf("Client hosts: %v\n", config.Clients.Hosts)
}

func main() {
	readToml()
}

输出结果：

Title: TOML Example

Owner: Tom Preston-Werner (ABC, GitHub Cofounder & CEO
Likes tater tots and beer.), Born: 0001-01-01 00:00:00 +0000 UTC

Database: 192.168.1.1 [8001 8001 8002] (Max conn, 5000), Enable? true

Server: alpha (10.0.0.1, eqdc10)
Server: beta (10.0.0.2, eqdc10)

Client data: [[gamma delta] [1 2] [true false]]
Client hosts: [alpha omega]