forked from open-policy-agent/gatekeeper
/
sync_controller.go
176 lines (153 loc) · 5.47 KB
/
sync_controller.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package sync
import (
"context"
"fmt"
"reflect"
"github.com/go-logr/logr"
opa "github.com/open-policy-agent/frameworks/constraint/pkg/client"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
"sigs.k8s.io/controller-runtime/pkg/source"
)
var log = logf.Log.WithName("controller").WithValues("metaKind", "Sync")
const (
finalizerName = "finalizers.gatekeeper.sh/sync"
)
type Adder struct {
Opa opa.Client
}
// Add creates a new Sync Controller and adds it to the Manager with default RBAC. The Manager will set fields on the Controller
// and Start it when the Manager is Started.
func (a *Adder) Add(mgr manager.Manager, gvk schema.GroupVersionKind) error {
r := newReconciler(mgr, gvk, a.Opa)
return add(mgr, r, gvk)
}
// newReconciler returns a new reconcile.Reconciler
func newReconciler(mgr manager.Manager, gvk schema.GroupVersionKind, opa opa.Client) reconcile.Reconciler {
return &ReconcileSync{
Client: mgr.GetClient(),
scheme: mgr.GetScheme(),
opa: opa,
log: log.WithValues("kind", gvk.Kind, "apiVersion", gvk.GroupVersion().String()),
gvk: gvk,
}
}
// add adds a new Controller to mgr with r as the reconcile.Reconciler
func add(mgr manager.Manager, r reconcile.Reconciler, gvk schema.GroupVersionKind) error {
// Create a new controller
c, err := controller.New(fmt.Sprintf("%s-sync-controller", gvk.String()), mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to the provided constraint
instance := unstructured.Unstructured{}
instance.SetGroupVersionKind(gvk)
err = c.Watch(&source.Kind{Type: &instance}, &handler.EnqueueRequestForObject{})
if err != nil {
return err
}
return nil
}
var _ reconcile.Reconciler = &ReconcileSync{}
// ReconcileSync reconciles an arbitrary constraint object described by Kind
type ReconcileSync struct {
client.Client
scheme *runtime.Scheme
opa opa.Client
gvk schema.GroupVersionKind
log logr.Logger
}
// Reconcile reads that state of the cluster for a constraint object and makes changes based on the state read
// and what is in the constraint.Spec
// +kubebuilder:rbac:groups=constraints.gatekeeper.sh,resources=*,verbs=get;list;watch;create;update;patch;delete
func (r *ReconcileSync) Reconcile(request reconcile.Request) (reconcile.Result, error) {
instance := &unstructured.Unstructured{}
instance.SetGroupVersionKind(r.gvk)
err := r.Get(context.TODO(), request.NamespacedName, instance)
if err != nil {
if errors.IsNotFound(err) {
// Object not found, return. Created objects are automatically garbage collected.
// For additional cleanup logic use finalizers.
return reconcile.Result{}, nil
}
// Error reading the object - requeue the request.
return reconcile.Result{}, err
}
// For some reason 'Status' objects corresponding to rejection messages are being pushed
if instance.GroupVersionKind() != r.gvk {
log.Info("ignoring unexpected data", "data", instance)
return reconcile.Result{}, nil
}
if instance.GetDeletionTimestamp().IsZero() {
if !containsString(finalizerName, instance.GetFinalizers()) {
instance.SetFinalizers(append(instance.GetFinalizers(), finalizerName))
// For some reason the instance sometimes gets changed by update when there is a race
// condition that leads to a validating webhook deny of the update
cpy := instance.DeepCopy()
if err := r.Update(context.Background(), cpy); err != nil {
return reconcile.Result{}, err
}
if !reflect.DeepEqual(instance, cpy) {
log.Info("instance and cpy differ")
}
}
log.Info("data will be added", "data", instance)
if _, err := r.opa.AddData(context.Background(), instance); err != nil {
return reconcile.Result{}, err
}
} else {
// Handle deletion
if HasFinalizer(instance) {
if _, err := r.opa.RemoveData(context.Background(), instance); err != nil {
return reconcile.Result{}, err
}
if err := RemoveFinalizer(r, instance); err != nil {
return reconcile.Result{}, err
}
}
}
return reconcile.Result{}, nil
}
func HasFinalizer(obj *unstructured.Unstructured) bool {
return containsString(finalizerName, obj.GetFinalizers())
}
func RemoveFinalizer(c client.Client, obj *unstructured.Unstructured) error {
obj.SetFinalizers(removeString(finalizerName, obj.GetFinalizers()))
return c.Update(context.Background(), obj)
}
func containsString(s string, items []string) bool {
for _, item := range items {
if item == s {
return true
}
}
return false
}
func removeString(s string, items []string) []string {
var rval []string
for _, item := range items {
if item != s {
rval = append(rval, item)
}
}
return rval
}