go语言 解析yaml文件详解

yaml格式文件作为配置文件、包管理文件，众多软件都在使用，go 语言通过 “gopkg.in/yaml.v2” 包，可以支持 yaml文件解析和处理。

robot@ubuntu:~/gomod/src/yaml$ cat conf.yaml 
config:
  user:
    - Tom
    - Lily
    - Skay
 
  mqtt:
     host: localhost:1883
     username: test
     password: test
 
  http: {port: "8080", host: "127.0.0.1"}

如何使用 "gopkg.in/yaml.v2"包处理这个文件呢，实例代码如下：

robot@ubuntu:~/gomod/src/yaml$ cat yaml.go 
package main

import (
	"os"
	"log"
	"fmt"
	"encoding/json"
	"gopkg.in/yaml.v2"
)

type HTTP struct {
	Port string `yaml:"port"`
	Host string `yaml:"host"`
}

type MQ struct {
	Host string `yaml:"host"`
	Username string `yaml:"username"`
	Password string `yaml:"password"`
}


type Debug struct {
	User []string `yaml:"user"`
	MQTT MQ `yaml:"mqtt"`
	Http HTTP `yaml:"http"`
}


type Config struct {
	Debug Debug `yaml:"config"`
}


func ReadYamlConfig(path string) (*Config,error){
	conf := &Config{}
	if f, err := os.Open(path); err != nil {
		return nil,err
	} else {
		yaml.NewDecoder(f).Decode(conf)
	}
	fmt.Println("conf: ", conf)
	return conf,nil
}

func main() {
	conf,err := ReadYamlConfig("conf.yaml")
	if err != nil {
		log.Fatal(err)
	}

	byts, err := json.Marshal(conf)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println("string:",string(byts))
}

如下：

robot@ubuntu:~/gomod/src/yaml$ ls
conf.yaml  go.mod  go.sum  yaml.go

robot@ubuntu:~/gomod/src/yaml$ go run yaml.go 
conf:  &{{[Tom Lily Skay] {localhost:1883 test test} {8080 127.0.0.1}}}
string: {"Debug":{"User":["Tom","Lily","Skay"],"MQTT":{"Host":"localhost:1883","Username":"test","Password":"test"},"Http":{"Port":"8080","Host":"127.0.0.1"}}}