-
Notifications
You must be signed in to change notification settings - Fork 0
/
user_cluster_ingress.go
259 lines (225 loc) · 8.61 KB
/
user_cluster_ingress.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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
package globaldns
import (
"context"
"fmt"
"strings"
"github.com/rancher/rancher/pkg/namespace"
v1Rancher "github.com/rancher/types/apis/core/v1"
v1beta1Rancher "github.com/rancher/types/apis/extensions/v1beta1"
"github.com/rancher/types/apis/management.cattle.io/v3"
projectv3 "github.com/rancher/types/apis/project.cattle.io/v3"
"github.com/rancher/types/config"
"github.com/sirupsen/logrus"
"k8s.io/api/core/v1"
"k8s.io/api/extensions/v1beta1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
)
const (
annotationGlobalDNS = "rancher.io/globalDNS.hostname"
appSelectorLabel = "io.cattle.field/appId"
projectSelectorLabel = "field.cattle.io/projectId"
UserIngressControllerName = "globaldns-useringress-controller"
UserGlobalDNSControllerName = "user-controller-watching-globaldns"
)
type UserIngressController struct {
ingresses v1beta1Rancher.IngressInterface
ingressLister v1beta1Rancher.IngressLister
globalDNSs v3.GlobalDNSInterface
globalDNSLister v3.GlobalDNSLister
appLister projectv3.AppLister
namespaceLister v1Rancher.NamespaceLister
multiclusterappLister v3.MultiClusterAppLister
}
func newUserIngressController(ctx context.Context, clusterContext *config.UserContext) *UserIngressController {
n := &UserIngressController{
ingresses: clusterContext.Extensions.Ingresses(""),
ingressLister: clusterContext.Extensions.Ingresses("").Controller().Lister(),
globalDNSs: clusterContext.Management.Management.GlobalDNSs(""),
globalDNSLister: clusterContext.Management.Management.GlobalDNSs("").Controller().Lister(),
appLister: clusterContext.Management.Project.Apps("").Controller().Lister(),
namespaceLister: clusterContext.Core.Namespaces("").Controller().Lister(),
multiclusterappLister: clusterContext.Management.Management.MultiClusterApps("").Controller().Lister(),
}
return n
}
func Register(ctx context.Context, clusterContext *config.UserContext) {
n := newUserIngressController(ctx, clusterContext)
clusterContext.Extensions.Ingresses("").AddHandler(ctx, UserIngressControllerName, n.sync)
g := newUserGlobalDNSController(clusterContext)
clusterContext.Management.Management.GlobalDNSs("").AddHandler(ctx, UserGlobalDNSControllerName, g.sync)
}
func (ic *UserIngressController) sync(key string, obj *v1beta1.Ingress) (runtime.Object, error) {
if obj == nil {
return nil, nil
}
//if there are no globaldns cr, skip this run
if ic.noGlobalDNS() {
logrus.Debug("UserIngressController: Skipping run, no Global DNS registered")
return nil, nil
}
annotations := obj.Annotations
logrus.Debugf("Ingress annotations %v", annotations)
//look for globalDNS annotation, if found load the GlobalDNS if there are Ingress endpoints
if annotations[annotationGlobalDNS] != "" && len(obj.Status.LoadBalancer.Ingress) > 0 {
fqdnRequested := annotations[annotationGlobalDNS]
//check if the corresponding GlobalDNS CR is present
globalDNS, err := ic.findGlobalDNS(fqdnRequested)
if globalDNS == nil {
return nil, nil
}
if err != nil {
return nil, fmt.Errorf("UserIngressController: Cannot find GlobalDNS resource for FQDN requested %v", fqdnRequested)
}
//check if 'multiclusterappID' on GlobalDNS CR matches the annotation on ingress OR
if err = ic.checkForMultiClusterApp(obj, globalDNS); err != nil {
return nil, err
}
//check if 'projectNames' on GlobalDNS CR matches to the user's project for multiclusterapp
if err = ic.checkForProjects(obj, globalDNS); err != nil {
return nil, err
}
//update endpoints on GlobalDNS status field
ingressEndpoints := gatherIngressEndpoints(obj.Status.LoadBalancer.Ingress)
if obj.DeletionTimestamp != nil {
err = ic.removeGlobalDNSEndpoints(globalDNS, ingressEndpoints)
} else {
err = ic.updateGlobalDNSEndpoints(globalDNS, ingressEndpoints)
}
return nil, err
}
return nil, nil
}
func (ic *UserIngressController) noGlobalDNS() bool {
gd, err := ic.globalDNSLister.List("", labels.NewSelector())
if err != nil {
return true
}
return len(gd) == 0
}
func gatherIngressEndpoints(ingressEps []v1.LoadBalancerIngress) []string {
endpoints := []string{}
for _, ep := range ingressEps {
if ep.IP != "" {
endpoints = append(endpoints, ep.IP)
} else if ep.Hostname != "" {
endpoints = append(endpoints, ep.Hostname)
}
}
return endpoints
}
func (ic *UserIngressController) updateGlobalDNSEndpoints(globalDNS *v3.GlobalDNS, ingressEndpoints []string) error {
globalDNS = prepareGlobalDNSForUpdate(globalDNS, ingressEndpoints)
_, err := ic.globalDNSs.Update(globalDNS)
if err != nil {
return fmt.Errorf("UserIngressController: Failed to update GlobalDNS endpoints with error %v", err)
}
return nil
}
func prepareGlobalDNSForUpdate(globalDNS *v3.GlobalDNS, ingressEndpoints []string) *v3.GlobalDNS {
originalLen := len(globalDNS.Status.Endpoints)
globalDNS.Status.Endpoints = append(globalDNS.Status.Endpoints, ingressEndpoints...)
if originalLen > 0 {
//dedup the endpoints
mapEndpoints := make(map[string]bool)
res := []string{}
for _, ep := range globalDNS.Status.Endpoints {
if !mapEndpoints[ep] {
mapEndpoints[ep] = true
res = append(res, ep)
}
}
globalDNS.Status.Endpoints = res
}
return globalDNS
}
func (ic *UserIngressController) removeGlobalDNSEndpoints(globalDNS *v3.GlobalDNS, ingressEndpoints []string) error {
mapRemovedEndpoints := make(map[string]bool)
for _, ep := range ingressEndpoints {
mapRemovedEndpoints[ep] = true
}
res := []string{}
for _, ep := range globalDNS.Status.Endpoints {
if !mapRemovedEndpoints[ep] {
res = append(res, ep)
}
}
globalDNS.Status.Endpoints = res
_, err := ic.globalDNSs.Update(globalDNS)
if err != nil {
return fmt.Errorf("UserIngressController: Failed to update GlobalDNS endpoints on ingress deletion, with error %v", err)
}
return nil
}
func (ic *UserIngressController) findGlobalDNS(fqdnRequested string) (*v3.GlobalDNS, error) {
allGlobalDNSs, err := ic.globalDNSLister.List("", labels.NewSelector())
if err != nil {
return nil, fmt.Errorf("UserIngressController: Error listing GlobalDNSs %v", err)
}
for _, gd := range allGlobalDNSs {
if strings.EqualFold(gd.Spec.FQDN, fqdnRequested) {
return gd, nil
}
}
return nil, nil
}
func (ic *UserIngressController) isProjectApproved(projectsApproved []string, project string) bool {
for _, listedProject := range projectsApproved {
split := strings.SplitN(listedProject, ":", 2)
if len(split) != 2 {
logrus.Errorf("UserIngressController: Error in splitting project ID %v", listedProject)
return false
}
listedProjectName := split[1]
if strings.EqualFold(listedProjectName, project) {
return true
}
}
return false
}
func (ic *UserIngressController) checkForMultiClusterApp(obj *v1beta1.Ingress, globalDNS *v3.GlobalDNS) error {
if globalDNS.Spec.MultiClusterAppName != "" {
ingressLabels := obj.Labels
appID := ingressLabels[appSelectorLabel]
if appID != "" {
//find the app CR
// go through all projects from multiclusterapp's targets
mcappName, err := getMultiClusterAppName(globalDNS.Spec.MultiClusterAppName)
if err != nil {
return err
}
mcapp, err := ic.multiclusterappLister.Get(namespace.GlobalNamespace, mcappName)
if err != nil {
return err
}
for _, t := range mcapp.Spec.Targets {
split := strings.SplitN(t.ProjectName, ":", 2)
if len(split) != 2 {
return fmt.Errorf("error in splitting project ID %v", t.ProjectName)
}
projectNS := split[1]
userApp, err := ic.appLister.Get(projectNS, appID)
if err != nil {
return fmt.Errorf("UserIngressController: Cannot find the App with the Id %v", userApp)
}
if !strings.EqualFold(userApp.Spec.MultiClusterAppName, globalDNS.Spec.MultiClusterAppName) {
return fmt.Errorf("UserIngressController: Cannot configure DNS since the App is not part of MulticlusterApp %v", globalDNS.Spec.MultiClusterAppName)
}
}
}
}
return nil
}
func (ic *UserIngressController) checkForProjects(obj *v1beta1.Ingress, globalDNS *v3.GlobalDNS) error {
if len(globalDNS.Spec.ProjectNames) > 0 {
ns, err := ic.namespaceLister.Get("", obj.Namespace)
if err != nil {
return fmt.Errorf("UserIngressController: Cannot find the App's namespace with the Id %v, error: %v", obj.Namespace, err)
}
nameSpaceProject := ns.ObjectMeta.Labels[projectSelectorLabel]
if !ic.isProjectApproved(globalDNS.Spec.ProjectNames, nameSpaceProject) {
return fmt.Errorf("UserIngressController: Cannot configure DNS since the App's project '%v' does not match GlobalDNS projectNames %v", nameSpaceProject, globalDNS.Spec.ProjectNames)
}
}
return nil
}