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apiresources.go
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/
apiresources.go
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package apiresources
import (
"context"
"fmt"
"strings"
"golang.org/x/sync/errgroup"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
"k8s.io/client-go/rest"
)
type resourceToMap struct {
Key schema.GroupVersionResource
Value schema.GroupVersionResource
}
func GetAllApiResources(config *rest.Config) (map[schema.GroupVersionResource]schema.GroupVersionResource, error) {
discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
return nil, err
}
APIResourceListSlice, err := discoveryClient.ServerPreferredResources()
if err != nil {
return nil, err
}
errGroup, _ := errgroup.WithContext(context.Background())
resourceChan := make(chan resourceToMap)
for _, singleAPIResourceList := range APIResourceListSlice {
apiResourcesList := singleAPIResourceList
errGroup.Go(func() error {
return getNamesFromResources(apiResourcesList, resourceChan)
})
}
errorCh := make(chan error)
go func() {
defer close(resourceChan)
errorCh <- errGroup.Wait()
}()
resourceKindMap := make(map[schema.GroupVersionResource]schema.GroupVersionResource)
for {
select {
case err := <-errorCh:
if err != nil {
close(errorCh)
return nil, err
}
return resourceKindMap, nil
case resource := <-resourceChan:
resourceKindMap[resource.Key] = resource.Value
}
}
}
func getNamesFromResources(apiResource *v1.APIResourceList, resourceChan chan<- resourceToMap) error {
apiVersion, err := schema.ParseGroupVersion(apiResource.GroupVersion)
if err != nil {
return err
}
for _, resource := range apiResource.APIResources {
groupVersionResource := schema.GroupVersionResource{
Resource: resource.Name,
Version: apiVersion.Version,
Group: apiVersion.Group,
}
resourceKeyValue := resourceToMap{
Key: schema.GroupVersionResource{
Resource: resource.Name,
Version: apiVersion.Version,
Group: apiVersion.Group,
},
Value: groupVersionResource,
}
resourceChan <- resourceKeyValue
resourceKeyValue.Key.Version = ""
resourceChan <- resourceKeyValue
}
return nil
}
func CompareWithApiResources(config *rest.Config, flagList []string) ([]schema.GroupVersionResource, error) {
apiResorces, err := GetAllApiResources(config)
if err != nil {
return nil, err
}
resultList := make([]schema.GroupVersionResource, len(flagList))
for i, resource := range flagList {
res, err := ParseResourceString(resource)
if err != nil {
return nil, err
}
if value, f := apiResorces[*res]; f {
resultList[i] = value
continue
}
return nil, fmt.Errorf("no such resource in kubernetes api: %v", res)
}
return resultList, nil
}
func ParseResourceString(arg string) (*schema.GroupVersionResource, error) {
split := "/"
resource := strings.Split(arg, split)
if strings.Count(arg, split) == 1 {
return &schema.GroupVersionResource{
Resource: resource[0],
Group: resource[1],
}, nil
} else if strings.Count(arg, split) == 2 {
return &schema.GroupVersionResource{
Resource: resource[0],
Version: resource[1],
Group: resource[2],
}, nil
}
return nil, fmt.Errorf("error parsing resource from flag: '%s'", arg)
}