github.com/banzaicloud/operator-tools@v0.28.10/pkg/inventory/scope.go (about)

     1  // Copyright © 2020 Banzai Cloud
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package inventory
    16  
    17  import (
    18  	"sync"
    19  
    20  	"emperror.dev/errors"
    21  	"k8s.io/apimachinery/pkg/runtime/schema"
    22  	"k8s.io/client-go/discovery"
    23  )
    24  
    25  var staticResourceScope map[string]bool
    26  var dynamicResourceScope map[string]bool
    27  
    28  var mutex = sync.RWMutex{}
    29  
    30  func AddStaticResourceScope(gk schema.GroupKind, namespaced bool) {
    31  	mutex.Lock()
    32  	defer mutex.Unlock()
    33  
    34  	if staticResourceScope == nil {
    35  		staticResourceScope = make(map[string]bool)
    36  	}
    37  	staticResourceScope[gk.String()] = namespaced
    38  }
    39  
    40  func getStaticResourceScope(gk schema.GroupKind) (bool, bool) {
    41  	mutex.RLock()
    42  	defer mutex.RUnlock()
    43  
    44  	namespaced, ok := staticResourceScope[gk.String()]
    45  	return namespaced, ok
    46  }
    47  
    48  // initializeAPIResources discovers api resources and returns true if initialization actually happened
    49  func initializeAPIResources(discoveryClient discovery.DiscoveryInterface) (bool, error) {
    50  	if len(dynamicResourceScope) == 0 {
    51  		return true, discoverAPIResources(discoveryClient)
    52  	}
    53  	return false, nil
    54  }
    55  
    56  func discoverAPIResources(discoveryClient discovery.DiscoveryInterface) error {
    57  	mutex.Lock()
    58  	defer mutex.Unlock()
    59  
    60  	_, apiResourcesList, err := discoveryClient.ServerGroupsAndResources()
    61  	if err != nil {
    62  		return errors.WrapIf(err, "couldn't retrieve the list of resources supported by API server")
    63  	}
    64  	for _, apiResources := range apiResourcesList {
    65  		if apiResources != nil {
    66  			gv, err := schema.ParseGroupVersion(apiResources.GroupVersion)
    67  			if err != nil {
    68  				return errors.WrapIff(err, "unable to parse groupversion %s", apiResources.GroupVersion)
    69  			}
    70  			for _, apiResource := range apiResources.APIResources {
    71  				gk := schema.GroupKind{Group: gv.Group, Kind: apiResource.Kind}
    72  				if dynamicResourceScope == nil {
    73  					dynamicResourceScope = make(map[string]bool)
    74  				}
    75  				dynamicResourceScope[gk.String()] = apiResource.Namespaced
    76  			}
    77  		}
    78  	}
    79  	return nil
    80  }
    81  
    82  // getDynamicResourceScope returns
    83  func getDynamicResourceScope(gk schema.GroupKind) (bool, bool) {
    84  	mutex.RLock()
    85  	defer mutex.RUnlock()
    86  
    87  	namespaced, ok := dynamicResourceScope[gk.String()]
    88  	return namespaced, ok
    89  }