├── LICENSE ├── README.md ├── api └── types │ └── v1alpha1 │ ├── project.go │ ├── register.go │ └── zz_generated.deepcopy.go ├── clientset └── v1alpha1 │ ├── api.go │ └── projects.go ├── go.mod ├── go.sum ├── informer.go ├── kubernetes ├── crd.yaml └── project.yaml └── main.go /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2018 Martin Helmich 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Kubernetes Custom Resource Definition (CRD) Example 2 | 3 | This repository contains the example files for my [blog article on defining and accessing Kubernetes Custom Resources](https://www.martin-helmich.de/en/blog/kubernetes-crd-client.html) with the [Kubernetes client-go package](https://github.com/kubernetes/client-go). 4 | 5 | ## Setup 6 | 7 | Building the example: 8 | 9 | $ go get github.com/martin-helmich/kubernetes-crd-example 10 | 11 | Setting up a custom resource definition (CRD) with an example object: 12 | 13 | $ kubectl apply -f https://raw.githubusercontent.com/martin-helmich/kubernetes-crd-example/master/kubernetes/crd.yaml 14 | $ kubectl apply -f https://raw.githubusercontent.com/martin-helmich/kubernetes-crd-example/master/kubernetes/project.yaml 15 | -------------------------------------------------------------------------------- /api/types/v1alpha1/project.go: -------------------------------------------------------------------------------- 1 | package v1alpha1 2 | 3 | //go:generate controller-gen object paths=$GOFILE 4 | 5 | import metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 6 | 7 | type ProjectSpec struct { 8 | Replicas int `json:"replicas"` 9 | } 10 | 11 | // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object 12 | type Project struct { 13 | metav1.TypeMeta `json:",inline"` 14 | metav1.ObjectMeta `json:"metadata,omitempty"` 15 | 16 | Spec ProjectSpec `json:"spec"` 17 | } 18 | 19 | // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object 20 | type ProjectList struct { 21 | metav1.TypeMeta `json:",inline"` 22 | metav1.ListMeta `json:"metadata,omitempty"` 23 | 24 | Items []Project `json:"items"` 25 | } 26 | -------------------------------------------------------------------------------- /api/types/v1alpha1/register.go: -------------------------------------------------------------------------------- 1 | package v1alpha1 2 | 3 | import ( 4 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 5 | "k8s.io/apimachinery/pkg/runtime" 6 | "k8s.io/apimachinery/pkg/runtime/schema" 7 | ) 8 | 9 | const GroupName = "example.martin-helmich.de" 10 | const GroupVersion = "v1alpha1" 11 | 12 | var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: GroupVersion} 13 | 14 | var ( 15 | SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes) 16 | AddToScheme = SchemeBuilder.AddToScheme 17 | ) 18 | 19 | func addKnownTypes(scheme *runtime.Scheme) error { 20 | scheme.AddKnownTypes(SchemeGroupVersion, 21 | &Project{}, 22 | &ProjectList{}, 23 | ) 24 | 25 | metav1.AddToGroupVersion(scheme, SchemeGroupVersion) 26 | return nil 27 | } 28 | -------------------------------------------------------------------------------- /api/types/v1alpha1/zz_generated.deepcopy.go: -------------------------------------------------------------------------------- 1 | // +build !ignore_autogenerated 2 | 3 | // Code generated by controller-gen. DO NOT EDIT. 4 | 5 | package v1alpha1 6 | 7 | import ( 8 | runtime "k8s.io/apimachinery/pkg/runtime" 9 | ) 10 | 11 | // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil. 12 | func (in *Project) DeepCopyInto(out *Project) { 13 | *out = *in 14 | out.TypeMeta = in.TypeMeta 15 | in.ObjectMeta.DeepCopyInto(&out.ObjectMeta) 16 | out.Spec = in.Spec 17 | } 18 | 19 | // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Project. 20 | func (in *Project) DeepCopy() *Project { 21 | if in == nil { 22 | return nil 23 | } 24 | out := new(Project) 25 | in.DeepCopyInto(out) 26 | return out 27 | } 28 | 29 | // DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object. 30 | func (in *Project) DeepCopyObject() runtime.Object { 31 | if c := in.DeepCopy(); c != nil { 32 | return c 33 | } 34 | return nil 35 | } 36 | 37 | // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil. 38 | func (in *ProjectList) DeepCopyInto(out *ProjectList) { 39 | *out = *in 40 | out.TypeMeta = in.TypeMeta 41 | in.ListMeta.DeepCopyInto(&out.ListMeta) 42 | if in.Items != nil { 43 | in, out := &in.Items, &out.Items 44 | *out = make([]Project, len(*in)) 45 | for i := range *in { 46 | (*in)[i].DeepCopyInto(&(*out)[i]) 47 | } 48 | } 49 | } 50 | 51 | // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ProjectList. 52 | func (in *ProjectList) DeepCopy() *ProjectList { 53 | if in == nil { 54 | return nil 55 | } 56 | out := new(ProjectList) 57 | in.DeepCopyInto(out) 58 | return out 59 | } 60 | 61 | // DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object. 62 | func (in *ProjectList) DeepCopyObject() runtime.Object { 63 | if c := in.DeepCopy(); c != nil { 64 | return c 65 | } 66 | return nil 67 | } 68 | -------------------------------------------------------------------------------- /clientset/v1alpha1/api.go: -------------------------------------------------------------------------------- 1 | package v1alpha1 2 | 3 | import ( 4 | "github.com/martin-helmich/kubernetes-crd-example/api/types/v1alpha1" 5 | "k8s.io/apimachinery/pkg/runtime/schema" 6 | "k8s.io/apimachinery/pkg/runtime/serializer" 7 | "k8s.io/client-go/kubernetes/scheme" 8 | "k8s.io/client-go/rest" 9 | ) 10 | 11 | type ExampleV1Alpha1Interface interface { 12 | Projects(namespace string) ProjectInterface 13 | } 14 | 15 | type ExampleV1Alpha1Client struct { 16 | restClient rest.Interface 17 | } 18 | 19 | func NewForConfig(c *rest.Config) (*ExampleV1Alpha1Client, error) { 20 | config := *c 21 | config.ContentConfig.GroupVersion = &schema.GroupVersion{Group: v1alpha1.GroupName, Version: v1alpha1.GroupVersion} 22 | config.APIPath = "/apis" 23 | config.NegotiatedSerializer = scheme.Codecs.WithoutConversion() 24 | config.UserAgent = rest.DefaultKubernetesUserAgent() 25 | 26 | client, err := rest.RESTClientFor(&config) 27 | if err != nil { 28 | return nil, err 29 | } 30 | 31 | return &ExampleV1Alpha1Client{restClient: client}, nil 32 | } 33 | 34 | func (c *ExampleV1Alpha1Client) Projects(namespace string) ProjectInterface { 35 | return &projectClient{ 36 | restClient: c.restClient, 37 | ns: namespace, 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /clientset/v1alpha1/projects.go: -------------------------------------------------------------------------------- 1 | package v1alpha1 2 | 3 | import ( 4 | "github.com/martin-helmich/kubernetes-crd-example/api/types/v1alpha1" 5 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 6 | "k8s.io/apimachinery/pkg/watch" 7 | "k8s.io/client-go/kubernetes/scheme" 8 | "k8s.io/client-go/rest" 9 | ) 10 | 11 | type ProjectInterface interface { 12 | List(opts metav1.ListOptions) (*v1alpha1.ProjectList, error) 13 | Get(name string, options metav1.GetOptions) (*v1alpha1.Project, error) 14 | Create(*v1alpha1.Project) (*v1alpha1.Project, error) 15 | Watch(opts metav1.ListOptions) (watch.Interface, error) 16 | // ... 17 | } 18 | 19 | type projectClient struct { 20 | restClient rest.Interface 21 | ns string 22 | } 23 | 24 | func (c *projectClient) List(opts metav1.ListOptions) (*v1alpha1.ProjectList, error) { 25 | result := v1alpha1.ProjectList{} 26 | err := c.restClient. 27 | Get(). 28 | Namespace(c.ns). 29 | Resource("projects"). 30 | VersionedParams(&opts, scheme.ParameterCodec). 31 | Do(). 32 | Into(&result) 33 | 34 | return &result, err 35 | } 36 | 37 | func (c *projectClient) Get(name string, opts metav1.GetOptions) (*v1alpha1.Project, error) { 38 | result := v1alpha1.Project{} 39 | err := c.restClient. 40 | Get(). 41 | Namespace(c.ns). 42 | Resource("projects"). 43 | Name(name). 44 | VersionedParams(&opts, scheme.ParameterCodec). 45 | Do(). 46 | Into(&result) 47 | 48 | return &result, err 49 | } 50 | 51 | func (c *projectClient) Create(project *v1alpha1.Project) (*v1alpha1.Project, error) { 52 | result := v1alpha1.Project{} 53 | err := c.restClient. 54 | Post(). 55 | Namespace(c.ns). 56 | Resource("projects"). 57 | Body(project). 58 | Do(). 59 | Into(&result) 60 | 61 | return &result, err 62 | } 63 | 64 | func (c *projectClient) Watch(opts metav1.ListOptions) (watch.Interface, error) { 65 | opts.Watch = true 66 | return c.restClient. 67 | Get(). 68 | Namespace(c.ns). 69 | Resource("projects"). 70 | VersionedParams(&opts, scheme.ParameterCodec). 71 | Watch() 72 | } 73 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/martin-helmich/kubernetes-crd-example 2 | 3 | go 1.13 4 | 5 | require ( 6 | k8s.io/apimachinery v0.17.0 7 | k8s.io/client-go v0.17.0 8 | ) 9 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 2 | cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 3 | cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= 4 | github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI= 5 | github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0= 6 | github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA= 7 | github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0= 8 | github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0= 9 | github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc= 10 | 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v0.0.0-20180320133207-05fbef0ca5da/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0= 76 | github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0= 77 | github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI= 78 | github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0= 79 | github.com/munnerz/goautoneg v0.0.0-20120707110453-a547fc61f48d/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ= 80 | github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f/go.mod h1:ZdcZmHo+o7JKHSa8/e818NopupXU1YMK5fe1lsApnBw= 81 | github.com/onsi/ginkgo v0.0.0-20170829012221-11459a886d9c/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE= 82 | github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE= 83 | github.com/onsi/ginkgo v1.10.1/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE= 84 | github.com/onsi/gomega v0.0.0-20170829124025-dcabb60a477c/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5uiA= 85 | github.com/onsi/gomega v1.7.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY= 86 | github.com/peterbourgon/diskv v2.0.1+incompatible/go.mod h1:uqqh8zWWbv1HBMNONnaR/tNboyR3/BZd58JJSHlUSCU= 87 | github.com/pmezard/go-difflib v0.0.0-20151028094244-d8ed2627bdf0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= 88 | github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= 89 | github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk= 90 | github.com/spf13/pflag v0.0.0-20170130214245-9ff6c6923cff/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4= 91 | github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA= 92 | github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg= 93 | github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 94 | github.com/stretchr/testify v0.0.0-20151208002404-e3a8ff8ce365/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs= 95 | github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI= 96 | github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4= 97 | go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU= 98 | golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4= 99 | golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= 100 | golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586 h1:7KByu05hhLed2MO29w7p1XfZvZ13m8mub3shuVftRs0= 101 | golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= 102 | golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= 103 | golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE= 104 | golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU= 105 | golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE= 106 | golang.org/x/net v0.0.0-20170114055629-f2499483f923/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 107 | golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 108 | golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 109 | golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 110 | golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 111 | golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 112 | golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 113 | golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 114 | golang.org/x/net v0.0.0-20191004110552-13f9640d40b9 h1:rjwSpXsdiK0dV8/Naq3kAw9ymfAeJIyd0upUIElB+lI= 115 | golang.org/x/net v0.0.0-20191004110552-13f9640d40b9/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 116 | golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U= 117 | golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw= 118 | golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 h1:SVwTIAaPC2U/AvvLNZ2a7OVsmBpC8L5BlwK1whH3hm0= 119 | golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw= 120 | golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 121 | golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 122 | golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 123 | golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 124 | golang.org/x/sys v0.0.0-20170830134202-bb24a47a89ea/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 125 | golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 126 | golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 127 | golang.org/x/sys v0.0.0-20190209173611-3b5209105503/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 128 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 129 | golang.org/x/sys 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h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys= 157 | gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc= 158 | gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw= 159 | gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw= 160 | gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 161 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 162 | gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I= 163 | gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 164 | honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 165 | honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 166 | k8s.io/api v0.17.0 h1:H9d/lw+VkZKEVIUc8F3wgiQ+FUXTTr21M87jXLU7yqM= 167 | k8s.io/api v0.17.0/go.mod h1:npsyOePkeP0CPwyGfXDHxvypiYMJxBWAMpQxCaJ4ZxI= 168 | k8s.io/apimachinery v0.17.0 h1:xRBnuie9rXcPxUkDizUsGvPf1cnlZCFu210op7J7LJo= 169 | k8s.io/apimachinery v0.17.0/go.mod h1:b9qmWdKlLuU9EBh+06BtLcSf/Mu89rWL33naRxs1uZg= 170 | k8s.io/client-go v0.17.0 h1:8QOGvUGdqDMFrm9sD6IUFl256BcffynGoe80sxgTEDg= 171 | k8s.io/client-go v0.17.0/go.mod h1:TYgR6EUHs6k45hb6KWjVD6jFZvJV4gHDikv/It0xz+k= 172 | k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0= 173 | k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk= 174 | k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk= 175 | k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8= 176 | k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I= 177 | k8s.io/kube-openapi v0.0.0-20191107075043-30be4d16710a/go.mod h1:1TqjTSzOxsLGIKfj0lK8EeCP7K1iUG65v09OM0/WG5E= 178 | k8s.io/utils v0.0.0-20191114184206-e782cd3c129f h1:GiPwtSzdP43eI1hpPCbROQCCIgCuiMMNF8YUVLF3vJo= 179 | k8s.io/utils v0.0.0-20191114184206-e782cd3c129f/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew= 180 | sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI= 181 | sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs= 182 | sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o= 183 | -------------------------------------------------------------------------------- /informer.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "time" 5 | 6 | "github.com/martin-helmich/kubernetes-crd-example/api/types/v1alpha1" 7 | client_v1alpha1 "github.com/martin-helmich/kubernetes-crd-example/clientset/v1alpha1" 8 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 9 | "k8s.io/apimachinery/pkg/runtime" 10 | "k8s.io/apimachinery/pkg/util/wait" 11 | "k8s.io/apimachinery/pkg/watch" 12 | "k8s.io/client-go/tools/cache" 13 | ) 14 | 15 | func WatchResources(clientSet client_v1alpha1.ExampleV1Alpha1Interface) cache.Store { 16 | projectStore, projectController := cache.NewInformer( 17 | &cache.ListWatch{ 18 | ListFunc: func(lo metav1.ListOptions) (result runtime.Object, err error) { 19 | return clientSet.Projects("some-namespace").List(lo) 20 | }, 21 | WatchFunc: func(lo metav1.ListOptions) (watch.Interface, error) { 22 | return clientSet.Projects("some-namespace").Watch(lo) 23 | }, 24 | }, 25 | &v1alpha1.Project{}, 26 | 1*time.Minute, 27 | cache.ResourceEventHandlerFuncs{}, 28 | ) 29 | 30 | go projectController.Run(wait.NeverStop) 31 | return projectStore 32 | } 33 | -------------------------------------------------------------------------------- /kubernetes/crd.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: "apiextensions.k8s.io/v1beta1" 2 | kind: "CustomResourceDefinition" 3 | metadata: 4 | name: "projects.example.martin-helmich.de" 5 | spec: 6 | group: "example.martin-helmich.de" 7 | version: "v1alpha1" 8 | scope: "Namespaced" 9 | names: 10 | plural: "projects" 11 | singular: "project" 12 | kind: "Project" 13 | validation: 14 | openAPIV3Schema: 15 | required: ["spec"] 16 | properties: 17 | spec: 18 | required: ["replicas"] 19 | properties: 20 | replicas: 21 | type: "integer" 22 | minimum: 1 -------------------------------------------------------------------------------- /kubernetes/project.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: "example.martin-helmich.de/v1alpha1" 2 | kind: "Project" 3 | metadata: 4 | name: "example-project" 5 | namespace: "default" 6 | spec: 7 | replicas: 1 -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "flag" 5 | "fmt" 6 | "log" 7 | "time" 8 | 9 | "github.com/martin-helmich/kubernetes-crd-example/api/types/v1alpha1" 10 | clientV1alpha1 "github.com/martin-helmich/kubernetes-crd-example/clientset/v1alpha1" 11 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 12 | "k8s.io/client-go/kubernetes/scheme" 13 | "k8s.io/client-go/rest" 14 | "k8s.io/client-go/tools/clientcmd" 15 | ) 16 | 17 | var kubeconfig string 18 | 19 | func init() { 20 | flag.StringVar(&kubeconfig, "kubeconfig", "", "path to Kubernetes config file") 21 | flag.Parse() 22 | } 23 | 24 | func main() { 25 | var config *rest.Config 26 | var err error 27 | 28 | if kubeconfig == "" { 29 | log.Printf("using in-cluster configuration") 30 | config, err = rest.InClusterConfig() 31 | } else { 32 | log.Printf("using configuration from '%s'", kubeconfig) 33 | config, err = clientcmd.BuildConfigFromFlags("", kubeconfig) 34 | } 35 | 36 | if err != nil { 37 | panic(err) 38 | } 39 | 40 | v1alpha1.AddToScheme(scheme.Scheme) 41 | 42 | clientSet, err := clientV1alpha1.NewForConfig(config) 43 | if err != nil { 44 | panic(err) 45 | } 46 | 47 | projects, err := clientSet.Projects("default").List(metav1.ListOptions{}) 48 | if err != nil { 49 | panic(err) 50 | } 51 | 52 | fmt.Printf("projects found: %+v\n", projects) 53 | 54 | store := WatchResources(clientSet) 55 | 56 | for { 57 | projectsFromStore := store.List() 58 | fmt.Printf("project in store: %d\n", len(projectsFromStore)) 59 | 60 | time.Sleep(2 * time.Second) 61 | } 62 | } 63 | --------------------------------------------------------------------------------