从YAML文档中解析嵌套的映射。

huangapple
go评论105阅读模式
英文:

Parse nested map from a YAML document

问题

我遇到了一个（我认为是）简单问题的困扰。
我正在尝试使用commando创建一个CLI，这个CLI将读取一个配置yaml文件，然后执行一些操作。然而，我在解析config.yaml文件时遇到了问题。
以下是我的代码：

  1. type Config struct {
  2. 	Apps map[string]App `yaml:"apps"`
  3. 	Branch string  `yaml:"branch"`
  4. }
  5. type App struct {
  6. 	hostName string `yaml:"hostName"`
  7. }
  8. .
  9. . //func main和其他标准内容放在这里
  10. .
  11. commando.
  12. 		Register("read").
  13. 		AddArgument("config", "read yaml file", "./config.yaml").
  14. 		SetAction(
  15. 			func(args map[string]commando.ArgValue, flags map[string]commando.FlagValue) {
  16. 				    //args["config"]等于./config.yaml，我将在下面给出
  17. 				    file, err := ioutil.ReadFile(args["config"].Value)
  18. 					if err != nil {
  19. 						log.Fatal(err)
  20. 					}
  22. 					var data2 Config
  23. 					err3 := yaml.Unmarshal(file, &data2)
  24. 					if err3 != nil {
  25. 						log.Fatal(err3)
  26. 					}
  27. 					fmt.Printf("Ad demo?: %#v\n", data2.Apps["ad-demo"].hostName)
  28. 					fmt.Printf("Data 2: %#v\n", data2)
  29. 			})
  30. 		commando.Parse(nil)

我的config.yaml文件如下：

  1. apps:
  2.   ad-tag:
  3.     hostName: ad-tag1.krg.io
  4.   ad-demo:
  5.     hostName: demo1.krg.io
  6. branch: KAT-3821

这个代码在大部分情况下是可以工作的。问题是以下内容打印出来了：

  1. Ad demo?: ""
  2. Data 2: main.Config{Apps:map[string]main.App{"ad-demo":main.App{hostName:""}, "ad-tag":main.App{hostName:""}}, Branch:"KAT-3821"}

hostName的值为空字符串。

你有什么想法，我做错了什么？我觉得这应该很简单，但是我无论如何都找不出错在哪里。

谢谢。

英文:

I am having trouble with (what I believe to be) a simple issue.
I am trying to create a CLI using commando, and this CLI will read a configuration yaml, and then do stuff. However, I am stuck at the parsing of the config.yaml
The following is my code:

  1. type Config struct {
  2. 	Apps map[string]App `yaml:"apps"`
  3. 	Branch string  `yaml:"branch"`
  4. }
  5. type App struct {
  6. 	hostName string `yaml:"hostName"`
  7. }
  8. .
  9. . //func main, and other standard stuff goes here
  10. .
  11. commando.
  12. 		Register("read").
  13. 		AddArgument("config", "read yaml file", "./config.yaml").
  14. 		SetAction(
  15. 			func(args map[string]commando.ArgValue, flags map[string]commando.FlagValue) {
  16. 				    //args["config"] equates to ./config.yaml and I will give that below
  17. 				    file, err := ioutil.ReadFile(args["config"].Value)
  18. 					if err != nil {
  19. 						log.Fatal(err)
  20. 					}
  22. 					var data2 Config
  23. 					err3 := yaml.Unmarshal(file, &data2)
  24. 					if err3 != nil {
  25. 						log.Fatal(err3)
  26. 					}
  27. 					fmt.Printf("Ad demo?: %#v\n", data2.Apps["ad-demo"].hostName)
  28. 					fmt.Printf("Data 2: %#v\n", data2)
  29. 			})
  30. 		commando.Parse(nil)

My config.yaml is as follows:

  1. apps:
  2.   ad-tag:
  3.     hostName: ad-tag1.krg.io
  4.   ad-demo:
  5.     hostName: demo1.krg.io
  6. branch: KAT-3821

This works for the most part. The problem is that the following prints:

  1. Ad demo?: ""
  2. Data 2: main.Config{Apps:map[string]main.App{"ad-demo":main.App{hostName:""}, "ad-tag":main.App{hostName:""}}, Branch:"KAT-3821"}

The hostName is coming up as an empty string.

Any idea as to what I am doing wrong? I feel like this should be very simple, but I cannot for the life of me figure out what I am doing wrong.

Thanks

答案1

得分: 1

主机名应该被导出，即首字母大写。

  1. type App struct {
  2.     HostName string `yaml:"hostName"`
  3. }

如果不导出它，例如yaml或json等包将无法读取该字段并填充它。

英文:

Hostname should be exported, i.e. capitalized

  1. type App struct {
  2.     HostName string `yaml:"hostName"`
  3. }

If you don't export it, packages such as yaml or json won't be able to read the field and populate it.

huangapple
  • 本文由 发表于 2021年12月17日 23:48:03
  • 转载请务必保留本文链接：https://go.coder-hub.com/70395623.html
  • go
  • parsing
  • yaml
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