如何解析复杂嵌套的 YAML 数据结构？

huangapple
go评论122阅读模式
英文:

How do I Unmarshal complex nesting of yaml

问题

如何解组这个数据？我试图提取名称、描述、版本和其他字段。但是当我打印出解组后的内容时，我得到以下结果：

Index: {ApiVersion:v1 Entry:map[]
Generated:2016-10-06T16:23:20.499029981-06:00}

以下是我到目前为止尝试过的方法。

  1. package main
  3. import (
  4.     "fmt"
  5.     "log"
  7.     "gopkg.in/yaml.v2"
  8. )
  10. const index_yaml = `apiVersion: v1
  11. entries:
  12.     alpine:
  13.     - created: 2016-10-06T16:23:20.499814565-06:00
  14.         description: Deploy a basic Alpine Linux pod
  15.         digest: 99c76e403d752c84ead610644d4b1c2f2b453a74b921f422b9dcb8a7c8b559cd
  16.         home: https://helm.sh/helm
  17.         name: alpine
  18.         sources:
  19.         - https://github.com/helm/helm
  20.         urls:
  21.         - https://technosophos.github.io/tscharts/alpine-0.2.0.tgz
  22.         version: 0.2.0
  23.     - created: 2016-10-06T16:23:20.499543808-06:00
  24.         description: Deploy a basic Alpine Linux pod
  25.         digest: 515c58e5f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cd78727
  26.         home: https://helm.sh/helm
  27.         name: alpine
  28.         sources:
  29.         - https://github.com/helm/helm
  30.         urls:
  31.         - https://technosophos.github.io/tscharts/alpine-0.1.0.tgz
  32.         version: 0.1.0
  33.     nginx:
  34.     - created: 2016-10-06T16:23:20.499543808-06:00
  35.         description: Create a basic nginx HTTP server
  36.         digest: aaff4545f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cdffffff
  37.         home: https://helm.sh/helm
  38.         name: nginx
  39.         sources:
  40.         - https://github.com/helm/charts
  41.         urls:
  42.         - https://technosophos.github.io/tscharts/nginx-1.1.0.tgz
  43.         version: 1.1.0
  44. generated: 2016-10-06T16:23:20.499029981-06:00`
  46. type Entry struct {
  47.     Created     string `yaml:"created"`
  48.     Description string `yaml:"description"`
  49.     Home        string `yaml:"home"`
  50. }
  52. type Entries map[string][]Entry
  54. type Index struct {
  55.     ApiVersion string  `yaml:"apiVersion"`
  56.     Entry      Entries `yaml:"entries"`
  57.     Generated  string  `yaml:"generated"`
  58. }
  60. func main() {
  61.     // data, err := ioutil.ReadFile("index.yaml")
  62.     // if err != nil {
  63.     // 	log.Fatal("Error reading index", err)
  64.     // 	return
  65.     // }
  67.     var index Index
  68.     err := yaml.Unmarshal([]byte(index_yaml), &index)
  69.     if err != nil {
  70.         log.Fatal("File reading error", err)
  71.         return
  72.     }
  74.     fmt.Printf("Index: %+v", index)
  75. }
英文:

How do I unmarshal this data? I'm trying to extract the Name, Description, Version and other fields. But when I print out the unmarshaled content I get the following:

> Index: {ApiVersion:v1 Entry:map[]
> Generated:2016-10-06T16:23:20.499029981-06:00}

Here is what I've tried so far.

  1. package main
  3. import (
  4.     "fmt"
  5.     "log"
  7.     "gopkg.in/yaml.v2"
  8. )
  10. const index_yaml = `apiVersion: v1
  11. entries:
  12.     alpine:
  13.     - created: 2016-10-06T16:23:20.499814565-06:00
  14.         description: Deploy a basic Alpine Linux pod
  15.         digest: 99c76e403d752c84ead610644d4b1c2f2b453a74b921f422b9dcb8a7c8b559cd
  16.         home: https://helm.sh/helm
  17.         name: alpine
  18.         sources:
  19.         - https://github.com/helm/helm
  20.         urls:
  21.         - https://technosophos.github.io/tscharts/alpine-0.2.0.tgz
  22.         version: 0.2.0
  23.     - created: 2016-10-06T16:23:20.499543808-06:00
  24.         description: Deploy a basic Alpine Linux pod
  25.         digest: 515c58e5f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cd78727
  26.         home: https://helm.sh/helm
  27.         name: alpine
  28.         sources:
  29.         - https://github.com/helm/helm
  30.         urls:
  31.         - https://technosophos.github.io/tscharts/alpine-0.1.0.tgz
  32.         version: 0.1.0
  33.     nginx:
  34.     - created: 2016-10-06T16:23:20.499543808-06:00
  35.         description: Create a basic nginx HTTP server
  36.         digest: aaff4545f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cdffffff
  37.         home: https://helm.sh/helm
  38.         name: nginx
  39.         sources:
  40.         - https://github.com/helm/charts
  41.         urls:
  42.         - https://technosophos.github.io/tscharts/nginx-1.1.0.tgz
  43.         version: 1.1.0
  44. generated: 2016-10-06T16:23:20.499029981-06:00`
  46. type Entry struct {
  47.     Created     string `yaml:"created"`
  48.     Description string `yaml:"created"`
  49.     Home        string `yaml:"home"`
  50. }
  52. type Entries map[string][]Entry
  54. type Index struct {
  55.     ApiVersion string  `yaml:"apiVersion"`
  56.     Entry      Entries `yaml:"entry"`
  57.     Generated  string  `yaml:"generated"`
  58. }
  60. func main() {
  61.     // data, err := ioutil.ReadFile("index.yaml")
  62.     // if err != nil {
  63.     // 	log.Fatal("Error reading index", err)
  64.     // 	return
  65.     // }
  67.     var index Index
  68.     err := yaml.Unmarshal([]byte(index_yaml), &index)
  69.     if err != nil {
  70.         log.Fatal("File reading error", err)
  71.         return
  72.     }
  74.     fmt.Printf("Index: %+v", index)
  75. }

答案1

得分: 1

这是一个很棒的服务，你可以使用它来为你的YAML文件生成结构体。以下是它的工作结果。

  1. type AutoGenerated struct {
  2.     APIVersion string `yaml:"apiVersion"`
  3.     Entries    struct {
  4.         Alpine []struct {
  5.             Created     struct{} `yaml:"created"`
  6.             Description string   `yaml:"description"`
  7.             Digest      string   `yaml:"digest"`
  8.             Home        string   `yaml:"home"`
  9.             Name        string   `yaml:"name"`
  10.             Sources     []string `yaml:"sources"`
  11.             Urls        []string `yaml:"urls"`
  12.             Version     string   `yaml:"version"`
  13.         } `yaml:"alpine"`
  14.         Nginx []struct {
  15.             Created     struct{} `yaml:"created"`
  16.             Description string   `yaml:"description"`
  17.             Digest      string   `yaml:"digest"`
  18.             Home        string   `yaml:"home"`
  19.             Name        string   `yaml:"name"`
  20.             Sources     []string `yaml:"sources"`
  21.             Urls        []string `yaml:"urls"`
  22.             Version     string   `yaml:"version"`
  23.         } `yaml:"nginx"`
  24.     } `yaml:"entries"`
  25.     Generated struct{} `yaml:"generated"`
  26. }
  28. var doc AutoGenerated
  29. err := yaml.Unmarshal([]byte(index_yaml), &doc)
  30. if err != nil {
  31.     log.Fatalf("error: %v", err)
  32.     return
  33. }
  35. fmt.Printf("Doc: %+v", doc)

你可以在需要的地方添加omitempty，或者根据需要更改结构。

更新：

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"log"
  7. 	"gopkg.in/yaml.v2"
  8. )
  10. type Entry struct {
  11. 	Created     string   `yaml:"created"`
  12. 	Description string   `yaml:"description"`
  13. 	Digest      string   `yaml:"digest"`
  14. 	Home        string   `yaml:"home"`
  15. 	Name        string   `yaml:"name"`
  16. 	Sources     []string `yaml:"sources"`
  17. 	Urls        []string `yaml:"urls"`
  18. 	Version     string   `yaml:"version"`
  19. }
  21. type AutoGenerated struct {
  22. 	APIVersion string             `yaml:"apiVersion"`
  23. 	Entries    map[string][]Entry `yaml:"entries"`
  24. 	Generated  string             `yaml:"generated"`
  25. }
  27. func main() {
  29. 	var doc AutoGenerated
  30. 	err := yaml.Unmarshal([]byte(index_yaml), &doc)
  31. 	if err != nil {
  32. 		log.Fatalf("error: %v", err)
  33. 		return
  34. 	}
  36. 	fmt.Printf("Doc: %+v", doc)
  38. }
  40. const index_yaml = `apiVersion: v1
  41. entries:
  42.   alpine:
  43.     - created: 2016-10-06T16:23:20.499814565-06:00
  44.       description: Deploy a basic Alpine Linux pod
  45.       digest: 99c76e403d752c84ead610644d4b1c2f2b453a74b921f422b9dcb8a7c8b559cd
  46.       home: https://helm.sh/helm
  47.       name: alpine
  48.       sources:
  49.       - https://github.com/helm/helm
  50.       urls:
  51.       - https://technosophos.github.io/tscharts/alpine-0.2.0.tgz
  52.       version: 0.2.0
  53.     - created: 2016-10-06T16:23:20.499543808-06:00
  54.       description: Deploy a basic Alpine Linux pod
  55.       digest: 515c58e5f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cd78727
  56.       home: https://helm.sh/helm
  57.       name: alpine
  58.       sources:
  59.       - https://github.com/helm/helm
  60.       urls:
  61.       - https://technosophos.github.io/tscharts/alpine-0.1.0.tgz
  62.       version: 0.1.0
  63.   nginx:
  64.     - created: 2016-10-06T16:23:20.499543808-06:00
  65.       description: Create a basic nginx HTTP server
  66.       digest: aaff4545f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cdffffff
  67.       home: https://helm.sh/helm
  68.       name: nginx
  69.       sources:
  70.       - https://github.com/helm/charts
  71.       urls:
  72.       - https://technosophos.github.io/tscharts/nginx-1.1.0.tgz
  73.       version: 1.1.0
  74. generated: 2016-10-06T16:23:20.499029981-06:00`
英文:

Here is wonderfull service you can use to make struct for your yamls. This is result of its work.

  1.     type AutoGenerated struct {
  2.         APIVersion string `yaml:"apiVersion"`
  3.         Entries    struct {
  4.             Alpine []struct {
  5.                 Created struct {
  6.                 } `yaml:"created"`
  7.                 Description string   `yaml:"description"`
  8.                 Digest      string   `yaml:"digest"`
  9.                 Home        string   `yaml:"home"`
  10.                 Name        string   `yaml:"name"`
  11.                 Sources     []string `yaml:"sources"`
  12.                 Urls        []string `yaml:"urls"`
  13.                 Version     string   `yaml:"version"`
  14.             } `yaml:"alpine"`
  15.             Nginx []struct {
  16.                 Created struct {
  17.                 } `yaml:"created"`
  18.                 Description string   `yaml:"description"`
  19.                 Digest      string   `yaml:"digest"`
  20.                 Home        string   `yaml:"home"`
  21.                 Name        string   `yaml:"name"`
  22.                 Sources     []string `yaml:"sources"`
  23.                 Urls        []string `yaml:"urls"`
  24.                 Version     string   `yaml:"version"`
  25.             } `yaml:"nginx"`
  26.         } `yaml:"entries"`
  27.         Generated struct {
  28.         } `yaml:"generated"`
  29.     }
  31.     var doc AutoGenerated
  32.     err := yaml.Unmarshal([]byte(index_yaml), &doc)
  33.     if err != nil {
  34.         log.Fatalf("error: %v", err)
  35.         return
  36.     }
  38.     fmt.Printf("Doc: %+v", doc)

you can add omitempty where you need it, or change structure as you want it.

update:

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"log"
  7. 	"gopkg.in/yaml.v2"
  8. )
  10. type Entry struct {
  11. 	Created     string   `yaml:"created"`
  12. 	Description string   `yaml:"description"`
  13. 	Digest      string   `yaml:"digest"`
  14. 	Home        string   `yaml:"home"`
  15. 	Name        string   `yaml:"name"`
  16. 	Sources     []string `yaml:"sources"`
  17. 	Urls        []string `yaml:"urls"`
  18. 	Version     string   `yaml:"version"`
  19. }
  21. type AutoGenerated struct {
  22. 	APIVersion string             `yaml:"apiVersion"`
  23. 	Entries    map[string][]Entry `yaml:"entries"`
  24. 	Generated  string             `yaml:"generated"`
  25. }
  27. func main() {
  29. 	var doc AutoGenerated
  30. 	err := yaml.Unmarshal([]byte(index_yaml), &doc)
  31. 	if err != nil {
  32. 		log.Fatalf("error: %v", err)
  33. 		return
  34. 	}
  36. 	fmt.Printf("Doc: %+v", doc)
  38. }
  40. const index_yaml = `apiVersion: v1
  41. entries:
  42.   alpine:
  43.     - created: 2016-10-06T16:23:20.499814565-06:00
  44.       description: Deploy a basic Alpine Linux pod
  45.       digest: 99c76e403d752c84ead610644d4b1c2f2b453a74b921f422b9dcb8a7c8b559cd
  46.       home: https://helm.sh/helm
  47.       name: alpine
  48.       sources:
  49.       - https://github.com/helm/helm
  50.       urls:
  51.       - https://technosophos.github.io/tscharts/alpine-0.2.0.tgz
  52.       version: 0.2.0
  53.     - created: 2016-10-06T16:23:20.499543808-06:00
  54.       description: Deploy a basic Alpine Linux pod
  55.       digest: 515c58e5f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cd78727
  56.       home: https://helm.sh/helm
  57.       name: alpine
  58.       sources:
  59.       - https://github.com/helm/helm
  60.       urls:
  61.       - https://technosophos.github.io/tscharts/alpine-0.1.0.tgz
  62.       version: 0.1.0
  63.   nginx:
  64.     - created: 2016-10-06T16:23:20.499543808-06:00
  65.       description: Create a basic nginx HTTP server
  66.       digest: aaff4545f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cdffffff
  67.       home: https://helm.sh/helm
  68.       name: nginx
  69.       sources:
  70.       - https://github.com/helm/charts
  71.       urls:
  72.       - https://technosophos.github.io/tscharts/nginx-1.1.0.tgz
  73.       version: 1.1.0
  74. generated: 2016-10-06T16:23:20.499029981-06:00`

答案2

得分: 0

首先，您需要修改您的yaml输入的缩进，然后根据建议将Entry Entries从yaml:"entry"修改为yaml:"entries"：

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"log"
  7. 	"gopkg.in/yaml.v2"
  8. )
  10. const index_yaml = `apiVersion: v1
  11. entries:
  12.   alpine:
  13.     - created: 2016-10-06T16:23:20.499814565-06:00
  14.       description: Deploy a basic Alpine Linux pod
  15.       digest: 99c76e403d752c84ead610644d4b1c2f2b453a74b921f422b9dcb8a7c8b559cd
  16.       home: https://helm.sh/helm
  17.       name: alpine
  18.       sources:
  19.       - https://github.com/helm/helm
  20.       urls:
  21.       - https://technosophos.github.io/tscharts/alpine-0.2.0.tgz
  22.       version: 0.2.0
  23.     - created: 2016-10-06T16:23:20.499543808-06:00
  24.       description: Deploy a basic Alpine Linux pod
  25.       digest: 515c58e5f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cd78727
  26.       home: https://helm.sh/helm
  27.       name: alpine
  28.       sources:
  29.       - https://github.com/helm/helm
  30.       urls:
  31.       - https://technosophos.github.io/tscharts/alpine-0.1.0.tgz
  32.       version: 0.1.0
  33.   nginx:
  34.     - created: 2016-10-06T16:23:20.499543808-06:00
  35.       description: Create a basic nginx HTTP server
  36.       digest: aaff4545f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cdffffff
  37.       home: https://helm.sh/helm
  38.       name: nginx
  39.       sources:
  40.       - https://github.com/helm/charts
  41.       urls:
  42.       - https://technosophos.github.io/tscharts/nginx-1.1.0.tgz
  43.       version: 1.1.0
  44. generated: 2016-10-06T16:23:20.499029981-06:00`
  46. type Entry struct {
  47. 	Created     string `yaml:"created"`
  48. 	Description string `yaml:"description"`
  50. 	Home string `yaml:"home"`
  51. }
  52. type Entries map[string][]Entry
  54. type Index struct {
  55. 	ApiVersion string  `yaml:"apiVersion"`
  56. 	Entry      Entries `yaml:"entries"`
  57. 	Generated  string  `yaml:"generated"`
  58. }
  60. func main() {
  62. 	var index Index
  63. 	err := yaml.Unmarshal([]byte(index_yaml), &index)
  64. 	if err != nil {
  65. 		log.Fatal("File reading error", err)
  66. 		return
  67. 	}
  69. 	fmt.Printf("Index: %+v", index)
  71. }

输出：

  1. Index: {ApiVersion:v1 Entry:map[alpine:[{Created:2016-10-06T16:23:20.499814565-06:00 Description:Deploy a basic Alpine Linux pod Home:https://helm.sh/helm} {Created:2016-10-06T16:23:20.499543808-06:00 Description:Deploy a basic Alpine Linux pod Home:https://helm.sh/helm}] nginx:[{Created:2016-10-06T16:23:20.499543808-06:00 Description:Create a basic nginx HTTP server Home:https://helm.sh/helm}]] Generated:2016-10-06T16:23:20.499029981-06:00}
英文:

Firstly you have to modify the indentation of your yaml input,then modify the Entry Entries from yaml:"entry" to yaml:"entries" as per suggestion:

  1. package main
  2. import (
  3. "fmt"
  4. "log"
  5. "gopkg.in/yaml.v2"
  6. )
  7. const index_yaml = `apiVersion: v1
  8. entries:
  9. alpine:
  10. - created: 2016-10-06T16:23:20.499814565-06:00
  11. description: Deploy a basic Alpine Linux pod
  12. digest: 99c76e403d752c84ead610644d4b1c2f2b453a74b921f422b9dcb8a7c8b559cd
  13. home: https://helm.sh/helm
  14. name: alpine
  15. sources:
  16. - https://github.com/helm/helm
  17. urls:
  18. - https://technosophos.github.io/tscharts/alpine-0.2.0.tgz
  19. version: 0.2.0
  20. - created: 2016-10-06T16:23:20.499543808-06:00
  21. description: Deploy a basic Alpine Linux pod
  22. digest: 515c58e5f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cd78727
  23. home: https://helm.sh/helm
  24. name: alpine
  25. sources:
  26. - https://github.com/helm/helm
  27. urls:
  28. - https://technosophos.github.io/tscharts/alpine-0.1.0.tgz
  29. version: 0.1.0
  30. nginx:
  31. - created: 2016-10-06T16:23:20.499543808-06:00
  32. description: Create a basic nginx HTTP server
  33. digest: aaff4545f79d8b2913a10cb400ebb6fa9c77fe813287afbacf1a0b897cdffffff
  34. home: https://helm.sh/helm
  35. name: nginx
  36. sources:
  37. - https://github.com/helm/charts
  38. urls:
  39. - https://technosophos.github.io/tscharts/nginx-1.1.0.tgz
  40. version: 1.1.0
  41. generated: 2016-10-06T16:23:20.499029981-06:00`
  42. type Entry struct {
  43. Created     string `yaml:"created"`
  44. Description string `yaml:"description"`
  45. Home string `yaml:"home"`
  46. }
  47. type Entries map[string][]Entry
  48. type Index struct {
  49. ApiVersion string  `yaml:"apiVersion"`
  50. Entry      Entries `yaml:"entries"`
  51. Generated  string  `yaml:"generated"`
  52. }
  53. func main() {
  54. var index Index
  55. err := yaml.Unmarshal([]byte(index_yaml), &index)
  56. if err != nil {
  57. log.Fatal("File reading error", err)
  58. return
  59. }
  60. fmt.Printf("Index: %+v", index)
  61. }

Output:

  1. Index: {ApiVersion:v1 Entry:map[alpine:[{Created:2016-10-06T16:23:20.499814565-06:00 Description:Deploy a basic Alpine Linux pod Home:https://helm.sh/helm} {Created:2016-10-06T16:23:20.499543808-06:00 Description:Deploy a basic Alpine Linux pod Home:https://helm.sh/helm}] nginx:[{Created:2016-10-06T16:23:20.499543808-06:00 Description:Create a basic nginx HTTP server Home:https://helm.sh/helm}]] Generated:2016-10-06T16:23:20.499029981-06:00}

huangapple
  • 本文由 发表于 2021年8月12日 17:49:26
  • 转载请务必保留本文链接：https://go.coder-hub.com/68755123.html
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  • yaml
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