在Viper中访问嵌套的YAML结构的问题

huangapple
go评论142阅读模式
英文:

Problem accessing nested YAML structure in Viper

问题

最近我尝试使用Viper和我的Cobra应用程序一起解析配置文件，但是发现无法解析内部嵌套块。ClustersOuter的映射始终为空，我确定mapstructure的标签是正确的。我更喜欢使用Viper的Unmarshal功能而不是手动获取数据类型。

输出结果：

  1. map[zones:[{ClustersOuter:map[] Id:1} {ClustersOuter:map[] Id:2}]]

不知何故，我似乎只能获取zone映射及其ID，而无法获取clusters映射的任何内容。

我的输入：
config.yml

  1. zones:
  2.   - id: 1
  3.     clusters:
  4.       - cluster_id: 1
  5.         k3s_config_file: "k3s-cluster-1-config.yaml"
  6.       - cluster_id: 2
  7.         k3s_config_file: "k3s-cluster-2-config.yaml"
  8.       - cluster_id: 3
  9.         k3s_config_file: "k3s-cluster-3-config.yaml" 
  10.   - id: 2
  11.     clusters:
  12.       - cluster_id: 1
  13.         k3s_config_file: "k3s-cluster-1-config.yaml"
  14.       - cluster_id: 2
  15.         k3s_config_file: "k3s-cluster-2-config.yaml"
  16.       - cluster_id: 3
  17.         k3s_config_file: "k3s-cluster-3-config.yaml"

configuration.go

  1. package config
  3. type Zones struct {
  4. 	ClustersOuter map[string][]ClustersOuter `mapstructure:"zones"`
  5. 	Id            int                        `mapstructure:"id"`
  6. }
  7. type ClustersInner struct {
  8. 	ClusterId     int    `mapstructure:"cluster_id"`
  9. 	K3sConfigFile string `mapstructure:"k3s_config_file"`
  10. }
  12. type ClustersOuter struct {
  13. 	ClustersInner map[string][]ClustersInner `mapstructure:"clusters"`
  14. }
  16. type ConfigSuper map[string][]Zones

main.go

  1. 	viper.SetConfigName("config")
  2. 	viper.AddConfigPath(".")
  3. 	viper.SetConfigType("yaml")
  5. 	if err := viper.ReadInConfig(); err != nil {
  6. 		log.Fatalf("Error reading config file, %s", err)
  7. 		return false
  8. 	}
  10. 	var configuration config.ConfigSuper
  11. 	err := viper.Unmarshal(&configuration)
  12. 	if err != nil {
  13. 		log.Fatalf("unable to decode into struct, %v", err)
  14. 	}
  16. 	fmt.Printf("%+v\n", configuration)
英文:

Recently trying out Viper with my Cobra app to parse my config, but turned out that I couldn't parse the inner nested block. The map for ClustersOuter is always empty, and I am sure the mapstructure is tagged correctly. I would prefer to use Viper Unmarshall feature rather than Getting the data type manually.

Output

  1. map[zones:[{ClustersOuter:map[] Id:1} {ClustersOuter:map[] Id:2}]]

Somehow it seems like I can only retrieve the zone map and its ID, but not any map for the clusters map.

My inputs:
config.yml

  1. zones:
  2.   - id: 1
  3.     clusters:
  4.       - cluster_id: 1
  5.         k3s_config_file: "k3s-cluster-1-config.yaml"
  6.       - cluster_id: 2
  7.         k3s_config_file: "k3s-cluster-2-config.yaml"
  8.       - cluster_id: 3
  9.         k3s_config_file: "k3s-cluster-3-config.yaml" 
  10.   - id: 2
  11.     clusters:
  12.       - cluster_id: 1
  13.         k3s_config_file: "k3s-cluster-1-config.yaml"
  14.       - cluster_id: 2
  15.         k3s_config_file: "k3s-cluster-2-config.yaml"
  16.       - cluster_id: 3
  17.         k3s_config_file: "k3s-cluster-3-config.yaml"

configuration.go

  1. package config
  3. type Zones struct {
  4. 	ClustersOuter map[string][]ClustersOuter `mapstructure:"zones"`
  5. 	Id            int                        `mapstructure:"id"`
  6. }
  7. type ClustersInner struct {
  8. 	ClusterId     int    `mapstructure:"cluster_id"`
  9. 	K3sConfigFile string `mapstructure:"k3s_config_file"`
  10. }
  12. type ClustersOuter struct {
  13. 	ClustersInner map[string][]ClustersInner `mapstructure:"clusters"`
  14. }
  16. type ConfigSuper map[string][]Zones

main.go

  1. 	viper.SetConfigName("config")
  2. 	viper.AddConfigPath(".")
  3. 	viper.SetConfigType("yaml")
  5. 	if err := viper.ReadInConfig(); err != nil {
  6. 		log.Fatalf("Error reading config file, %s", err)
  7. 		return false
  8. 	}
  10. 	var configuration config.ConfigSuper
  11. 	err := viper.Unmarshal(&configuration)
  12. 	if err != nil {
  13. 		log.Fatalf("unable to decode into struct, %v", err)
  14. 	}
  16. 	fmt.Printf("%+v\n", configuration)

答案1

得分: 3

你的结构类型与YAML类型不匹配，看起来你将映射和切片组合在一起，而实际上你只处理切片。在YAML中，映射的格式如下：

  1. myMap:
  2.     key1: value1

而数组的格式如下：

  1. myArray:
  2.     - foo: bar

不幸的是，你的配置对象混乱到我无法理解意图，所以我为你重新编写了它。这些类型可以被Viper解码而没有任何问题。

  1. type Config struct {
  2.     Zones []Zone `mapstructure:"zones"`
  3. }
  5. type Zone struct {
  6.     ID       int        `mapstructure:"id"`
  7.     Clusters []Cluster `mapstructure:"clusters"`
  8. }
  10. type Cluster struct {
  11.     ClusterID     int    `mapstructure:"cluster_id"`
  12.     K3sConfigFile string `mapstructure:"k3s_config_file"`
  13. }

Config 结构体是根对象，请确保解组到该结构体中。

  1. config := Config{}
  2. err = viper.Unmarshal(&config)
英文:

Your struct types do not reflect the YAML type, it looks like you've combined maps and slices together when you're only dealing with slices. In YAML, maps look like this:

  1. myMap:
  2.     key1: value1

and arrays look like this:

  1. myArray:
  2.     - foo: bar

Unfortunately, your config object is messed up enough that I can't understand the intent so I re-wrote it for you. These types can be decoded by Viper without any issues.

  1. type Config struct {
  2. 	Zones []Zone `mapstructure:"zones"`
  3. }
  5. type Zone struct {
  6. 	ID       int        `mapstructure:"id"`
  7. 	Clusters []Cluster `mapstructure:"clusters"`
  8. }
  10. type Cluster struct {
  11. 	ClusterID     int    `mapstructure:"cluster_id"`
  12. 	K3sConfigFile string `mapstructure:"k3s_config_file"`
  13. }

The Config struct is the root object, make sure to unmarshal into that.

  1. config := Config{}
  2. err = viper.Unmarshal(&config)

huangapple
  • 本文由 发表于 2021年6月5日 04:55:26
  • 转载请务必保留本文链接：https://go.coder-hub.com/67843868.html
  • go
  • viper-go
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定