watch.go

Documentation: sigs.k8s.io/controller-runtime/pkg/client

     1  /*
     2  Copyright 2020 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 client
    18  
    19  import (
    20  	"context"
    21  	"strings"
    22  
    23  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    24  	"k8s.io/apimachinery/pkg/runtime"
    25  	"k8s.io/apimachinery/pkg/watch"
    26  	"k8s.io/client-go/rest"
    27  )
    28  
    29  // NewWithWatch returns a new WithWatch.
    30  func NewWithWatch(config *rest.Config, options Options) (WithWatch, error) {
    31  	client, err := newClient(config, options)
    32  	if err != nil {
    33  		return nil, err
    34  	}
    35  	return &watchingClient{client: client}, nil
    36  }
    37  
    38  type watchingClient struct {
    39  	*client
    40  }
    41  
    42  func (w *watchingClient) Watch(ctx context.Context, list ObjectList, opts ...ListOption) (watch.Interface, error) {
    43  	switch l := list.(type) {
    44  	case runtime.Unstructured:
    45  		return w.unstructuredWatch(ctx, l, opts...)
    46  	case *metav1.PartialObjectMetadataList:
    47  		return w.metadataWatch(ctx, l, opts...)
    48  	default:
    49  		return w.typedWatch(ctx, l, opts...)
    50  	}
    51  }
    52  
    53  func (w *watchingClient) listOpts(opts ...ListOption) ListOptions {
    54  	listOpts := ListOptions{}
    55  	listOpts.ApplyOptions(opts)
    56  	if listOpts.Raw == nil {
    57  		listOpts.Raw = &metav1.ListOptions{}
    58  	}
    59  	listOpts.Raw.Watch = true
    60  
    61  	return listOpts
    62  }
    63  
    64  func (w *watchingClient) metadataWatch(ctx context.Context, obj *metav1.PartialObjectMetadataList, opts ...ListOption) (watch.Interface, error) {
    65  	gvk := obj.GroupVersionKind()
    66  	gvk.Kind = strings.TrimSuffix(gvk.Kind, "List")
    67  
    68  	listOpts := w.listOpts(opts...)
    69  
    70  	resInt, err := w.client.metadataClient.getResourceInterface(gvk, listOpts.Namespace)
    71  	if err != nil {
    72  		return nil, err
    73  	}
    74  
    75  	return resInt.Watch(ctx, *listOpts.AsListOptions())
    76  }
    77  
    78  func (w *watchingClient) unstructuredWatch(ctx context.Context, obj runtime.Unstructured, opts ...ListOption) (watch.Interface, error) {
    79  	r, err := w.client.unstructuredClient.resources.getResource(obj)
    80  	if err != nil {
    81  		return nil, err
    82  	}
    83  
    84  	listOpts := w.listOpts(opts...)
    85  
    86  	return r.Get().
    87  		NamespaceIfScoped(listOpts.Namespace, r.isNamespaced()).
    88  		Resource(r.resource()).
    89  		VersionedParams(listOpts.AsListOptions(), w.client.unstructuredClient.paramCodec).
    90  		Watch(ctx)
    91  }
    92  
    93  func (w *watchingClient) typedWatch(ctx context.Context, obj ObjectList, opts ...ListOption) (watch.Interface, error) {
    94  	r, err := w.client.typedClient.resources.getResource(obj)
    95  	if err != nil {
    96  		return nil, err
    97  	}
    98  
    99  	listOpts := w.listOpts(opts...)
   100  
   101  	return r.Get().
   102  		NamespaceIfScoped(listOpts.Namespace, r.isNamespaced()).
   103  		Resource(r.resource()).
   104  		VersionedParams(listOpts.AsListOptions(), w.client.typedClient.paramCodec).
   105  		Watch(ctx)
   106  }
   107
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