go - 将 yaml 文件解析为 go 中的预定义结构

Question

我有多个需要解析且结构完全相同的yaml文件

schema: "1.0.0"
id: test
version: "1.2.3"


dependency :
  - name: ui
    type: runner
    cwd: /ui
    install:
       - name: api
         group: test
         properties:
             name: app
             url: appUrl

  - name: backend
    type: mongoDb
    path: be
    install:
       - name: db
         type: mongo
    provides:
       - name: api
         properties:
            url: url

The schema section is mandatory for all the yaml which the app should get always

The dependency tag can contain 1..n entries with mandatory fields ,name, type, cwd

The dependency tag can (or not) contain install section with name and properties which is mandatory

The dependency tag can (or not) contain provides section with name and which is mandatory

The install can have properties and the provides also can have properties

我正在使用 yaml parser解析文件，但我的问题是如何在 Golang 中构建结构，当我解析文档时它会自动填充主结构并将包括子结构(例如依赖项/安装部分)

我试过类似的东西

type main struct {
    schema struct {
        schema  string
        id int
        version string
    }

    dependency struct {
        name  string
        type string
        cwd string

    install struct {
        name  string
    }


}

在安装部分，它可以是组或类型或两者，它也可以有属性部分，所以我不确定如何构建 我用来解析文档的一些通用/可扩展结构(文档具有接近的属性列表，我在示例中描述的内容描述了最多的选项)

我用这个库来解析文档

yaml parser

Answer 1

你的结构定义应该是这样的

type Yaml struct {
    Schema     string
    ID         string
    Version    string
    Dependency []Dependency
}

type Dependency struct {
    Name     string
    Type     string
    CWD      string
    Install  []Install
    Provides []Provide
}

type Install struct {
    Name       string
    Group      string
    Type       string
    Properties Properties
}

type Properties struct {
    Name string
    URL  string
}

type Provide struct {
    Name       string
    Properties Properties
}

这是完整的示例代码:

package main

import (
    "fmt"
    "io/ioutil"
    "log"

    "gopkg.in/yaml.v2"
)

var data = `
schema: "1.0.0"
id: test
version: "1.2.3"


dependency :
  - name: ui
    type: runner
    cwd: /ui
    install:
       - name: api
         group: test
         properties:
             name: app
             url: appUrl

  - name: backend
    type: mongoDb
    path: be
    install:
       - name: db
         type: mongo
    provides:
       - name: api
         properties:
             url: url
`

type Yaml struct {
    Schema     string
    ID         string
    Version    string
    Dependency []Dependency
}

type Dependency struct {
    Name     string
    Type     string
    CWD      string
    Install  []Install
    Provides []Provide
}

type Install struct {
    Name       string
    Group      string
    Type       string
    Properties Properties
}

type Properties struct {
    Name string
    URL  string
}

type Provide struct {
    Name       string
    Properties Properties
}

func main() {
    y := Yaml{}

    err := yaml.Unmarshal([]byte(data), &y)
    if err != nil {
        log.Fatalf("error: %v", err)
    }
    fmt.Printf("%+v\n", y)

}

输出

{Schema:1.0.0 ID:test Version:1.2.3 Dependency:[{Name:ui Type:runner CWD:/ui Install:[{Name:api Group:test Type: Properties:{Name:appURL:appUrl}}] Provides:[]} {Name:backend Type:mongoDb CWD: Install:[{Name:db Group: Type:mongo Properties:{Name: URL:}}] Provides:[{Name:api Properties:{Name: URL:url}}]}]}

如果你想从 yaml 文件中读取，在 main func 中只需替换:

err := yaml.Unmarshal([]byte(data), &y)

与

yamlFile, err := ioutil.ReadFile("yaml_sample.yaml")
if err != nil {
    log.Printf("yamlFile.Get err   #%v ", err)
}
err = yaml.Unmarshal(yamlFile, &y)