shim.go

Documentation: k8s.io/client-go/metadata/metadatalister

     1  /*
     2  Copyright 2018 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package metadatalister
    18  
    19  import (
    20  	"k8s.io/apimachinery/pkg/labels"
    21  	"k8s.io/apimachinery/pkg/runtime"
    22  	"k8s.io/client-go/tools/cache"
    23  )
    24  
    25  var _ cache.GenericLister = &metadataListerShim{}
    26  var _ cache.GenericNamespaceLister = &metadataNamespaceListerShim{}
    27  
    28  // metadataListerShim implements the cache.GenericLister interface.
    29  type metadataListerShim struct {
    30  	lister Lister
    31  }
    32  
    33  // NewRuntimeObjectShim returns a new shim for Lister.
    34  // It wraps Lister so that it implements cache.GenericLister interface
    35  func NewRuntimeObjectShim(lister Lister) cache.GenericLister {
    36  	return &metadataListerShim{lister: lister}
    37  }
    38  
    39  // List will return all objects across namespaces
    40  func (s *metadataListerShim) List(selector labels.Selector) (ret []runtime.Object, err error) {
    41  	objs, err := s.lister.List(selector)
    42  	if err != nil {
    43  		return nil, err
    44  	}
    45  
    46  	ret = make([]runtime.Object, len(objs))
    47  	for index, obj := range objs {
    48  		ret[index] = obj
    49  	}
    50  	return ret, err
    51  }
    52  
    53  // Get will attempt to retrieve assuming that name==key
    54  func (s *metadataListerShim) Get(name string) (runtime.Object, error) {
    55  	return s.lister.Get(name)
    56  }
    57  
    58  func (s *metadataListerShim) ByNamespace(namespace string) cache.GenericNamespaceLister {
    59  	return &metadataNamespaceListerShim{
    60  		namespaceLister: s.lister.Namespace(namespace),
    61  	}
    62  }
    63  
    64  // metadataNamespaceListerShim implements the NamespaceLister interface.
    65  // It wraps NamespaceLister so that it implements cache.GenericNamespaceLister interface
    66  type metadataNamespaceListerShim struct {
    67  	namespaceLister NamespaceLister
    68  }
    69  
    70  // List will return all objects in this namespace
    71  func (ns *metadataNamespaceListerShim) List(selector labels.Selector) (ret []runtime.Object, err error) {
    72  	objs, err := ns.namespaceLister.List(selector)
    73  	if err != nil {
    74  		return nil, err
    75  	}
    76  
    77  	ret = make([]runtime.Object, len(objs))
    78  	for index, obj := range objs {
    79  		ret[index] = obj
    80  	}
    81  	return ret, err
    82  }
    83  
    84  // Get will attempt to retrieve by namespace and name
    85  func (ns *metadataNamespaceListerShim) Get(name string) (runtime.Object, error) {
    86  	return ns.namespaceLister.Get(name)
    87  }
    88
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