komega.go

Documentation: sigs.k8s.io/controller-runtime/pkg/envtest/komega

     1  /*
     2  Copyright 2021 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 komega
    18  
    19  import (
    20  	"context"
    21  
    22  	"k8s.io/apimachinery/pkg/types"
    23  	"sigs.k8s.io/controller-runtime/pkg/client"
    24  )
    25  
    26  // komega is a collection of utilites for writing tests involving a mocked
    27  // Kubernetes API.
    28  type komega struct {
    29  	ctx    context.Context
    30  	client client.Client
    31  }
    32  
    33  var _ Komega = &komega{}
    34  
    35  // New creates a new Komega instance with the given client.
    36  func New(c client.Client) Komega {
    37  	return &komega{
    38  		client: c,
    39  		ctx:    context.Background(),
    40  	}
    41  }
    42  
    43  // WithContext returns a copy that uses the given context.
    44  func (k komega) WithContext(ctx context.Context) Komega {
    45  	k.ctx = ctx
    46  	return &k
    47  }
    48  
    49  // Get returns a function that fetches a resource and returns the occurring error.
    50  func (k *komega) Get(obj client.Object) func() error {
    51  	key := types.NamespacedName{
    52  		Name:      obj.GetName(),
    53  		Namespace: obj.GetNamespace(),
    54  	}
    55  	return func() error {
    56  		return k.client.Get(k.ctx, key, obj)
    57  	}
    58  }
    59  
    60  // List returns a function that lists resources and returns the occurring error.
    61  func (k *komega) List(obj client.ObjectList, opts ...client.ListOption) func() error {
    62  	return func() error {
    63  		return k.client.List(k.ctx, obj, opts...)
    64  	}
    65  }
    66  
    67  // Update returns a function that fetches a resource, applies the provided update function and then updates the resource.
    68  func (k *komega) Update(obj client.Object, updateFunc func(), opts ...client.UpdateOption) func() error {
    69  	key := types.NamespacedName{
    70  		Name:      obj.GetName(),
    71  		Namespace: obj.GetNamespace(),
    72  	}
    73  	return func() error {
    74  		err := k.client.Get(k.ctx, key, obj)
    75  		if err != nil {
    76  			return err
    77  		}
    78  		updateFunc()
    79  		return k.client.Update(k.ctx, obj, opts...)
    80  	}
    81  }
    82  
    83  // UpdateStatus returns a function that fetches a resource, applies the provided update function and then updates the resource's status.
    84  func (k *komega) UpdateStatus(obj client.Object, updateFunc func(), opts ...client.SubResourceUpdateOption) func() error {
    85  	key := types.NamespacedName{
    86  		Name:      obj.GetName(),
    87  		Namespace: obj.GetNamespace(),
    88  	}
    89  	return func() error {
    90  		err := k.client.Get(k.ctx, key, obj)
    91  		if err != nil {
    92  			return err
    93  		}
    94  		updateFunc()
    95  		return k.client.Status().Update(k.ctx, obj, opts...)
    96  	}
    97  }
    98  
    99  // Object returns a function that fetches a resource and returns the object.
   100  func (k *komega) Object(obj client.Object) func() (client.Object, error) {
   101  	key := types.NamespacedName{
   102  		Name:      obj.GetName(),
   103  		Namespace: obj.GetNamespace(),
   104  	}
   105  	return func() (client.Object, error) {
   106  		err := k.client.Get(k.ctx, key, obj)
   107  		return obj, err
   108  	}
   109  }
   110  
   111  // ObjectList returns a function that fetches a resource and returns the object.
   112  func (k *komega) ObjectList(obj client.ObjectList, opts ...client.ListOption) func() (client.ObjectList, error) {
   113  	return func() (client.ObjectList, error) {
   114  		err := k.client.List(k.ctx, obj, opts...)
   115  		return obj, err
   116  	}
   117  }
   118
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