-
Notifications
You must be signed in to change notification settings - Fork 346
/
discoverer.go
220 lines (195 loc) · 6.13 KB
/
discoverer.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
// Copyright 2023 Antrea Authors
//
// 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 servicecidr
import (
"fmt"
"net"
"sync"
"time"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/types"
coreinformers "k8s.io/client-go/informers/core/v1"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog/v2"
utilnet "k8s.io/utils/net"
"k8s.io/utils/strings/slices"
"antrea.io/antrea/pkg/agent/util"
)
const (
// Disable resyncing.
resyncPeriod time.Duration = 0
)
type EventHandler func(serviceCIDRs []*net.IPNet)
type Interface interface {
GetServiceCIDRs() ([]*net.IPNet, error)
// The added handlers will be called when Service CIDR changes.
AddEventHandler(handler EventHandler)
}
type Discoverer struct {
serviceInformer cache.SharedIndexInformer
serviceLister corelisters.ServiceLister
sync.RWMutex
serviceIPv4CIDR *net.IPNet
serviceIPv6CIDR *net.IPNet
eventHandlers []EventHandler
// queue maintains the Service objects that need to be synced.
queue workqueue.Interface
// initialized indicates whether the Discoverer has been initialized.
initialized bool
}
func NewServiceCIDRDiscoverer(serviceInformer coreinformers.ServiceInformer) *Discoverer {
d := &Discoverer{
serviceInformer: serviceInformer.Informer(),
serviceLister: serviceInformer.Lister(),
queue: workqueue.New(),
}
d.serviceInformer.AddEventHandlerWithResyncPeriod(
cache.ResourceEventHandlerFuncs{
AddFunc: d.addService,
UpdateFunc: d.updateService,
},
resyncPeriod,
)
return d
}
func (d *Discoverer) Run(stopCh <-chan struct{}) {
defer d.queue.ShutDown()
klog.Info("Starting ServiceCIDRDiscoverer")
defer klog.Info("Stopping ServiceCIDRDiscoverer")
if !cache.WaitForCacheSync(stopCh, d.serviceInformer.HasSynced) {
return
}
svcs, _ := d.serviceLister.List(labels.Everything())
d.updateServiceCIDR(svcs...)
go func() {
for {
obj, quit := d.queue.Get()
if quit {
return
}
nn := obj.(types.NamespacedName)
svc, _ := d.serviceLister.Services(nn.Namespace).Get(nn.Name)
// Ignore it if not found.
if svc != nil {
d.updateServiceCIDR(svc)
}
d.queue.Done(obj)
}
}()
<-stopCh
}
func (d *Discoverer) GetServiceCIDRs() ([]*net.IPNet, error) {
d.RLock()
defer d.RUnlock()
if !d.initialized {
return nil, fmt.Errorf("Service CIDR discoverer is not initialized yet")
}
var serviceCIDRs []*net.IPNet
if d.serviceIPv4CIDR != nil {
serviceCIDRs = append(serviceCIDRs, d.serviceIPv4CIDR)
}
if d.serviceIPv6CIDR != nil {
serviceCIDRs = append(serviceCIDRs, d.serviceIPv6CIDR)
}
return serviceCIDRs, nil
}
func (d *Discoverer) AddEventHandler(handler EventHandler) {
d.eventHandlers = append(d.eventHandlers, handler)
}
func (d *Discoverer) addService(obj interface{}) {
svc := obj.(*corev1.Service)
klog.V(2).InfoS("Processing Service ADD event", "Service", klog.KObj(svc))
d.queue.Add(types.NamespacedName{Namespace: svc.Namespace, Name: svc.Name})
}
func (d *Discoverer) updateService(old, obj interface{}) {
oldSvc := old.(*corev1.Service)
curSvc := obj.(*corev1.Service)
klog.V(2).InfoS("Processing Service UPDATE event", "Service", klog.KObj(curSvc))
if !slices.Equal(oldSvc.Spec.ClusterIPs, curSvc.Spec.ClusterIPs) {
d.queue.Add(types.NamespacedName{Namespace: curSvc.Namespace, Name: curSvc.Name})
}
}
func (d *Discoverer) updateServiceCIDR(svcs ...*corev1.Service) {
var newServiceCIDRs []*net.IPNet
curServiceIPv4CIDR, curServiceIPv6CIDR := func() (*net.IPNet, *net.IPNet) {
d.RLock()
defer d.RUnlock()
return d.serviceIPv4CIDR, d.serviceIPv6CIDR
}()
updated := false
for _, svc := range svcs {
for _, clusterIPStr := range svc.Spec.ClusterIPs {
clusterIP := net.ParseIP(clusterIPStr)
if clusterIP == nil {
klog.V(2).InfoS("Skip invalid ClusterIP", "ClusterIP", clusterIPStr)
continue
}
isIPv6 := utilnet.IsIPv6(clusterIP)
curServiceCIDR := curServiceIPv4CIDR
mask := net.IPv4len * 8
if isIPv6 {
curServiceCIDR = curServiceIPv6CIDR
mask = net.IPv6len * 8
}
if curServiceCIDR != nil && curServiceCIDR.Contains(clusterIP) {
continue
}
var newServiceCIDR *net.IPNet
var err error
if curServiceCIDR != nil {
// If the calculated Service CIDR exists but doesn't contain the ClusterIP, calculate a new Service CIDR by
// enlarging the current Service CIDR with the ClusterIP.
if newServiceCIDR, err = util.ExtendCIDRWithIP(curServiceCIDR, clusterIP); err != nil {
klog.ErrorS(err, "Error when enlarging the Service CIDR", "ServiceCIDR", curServiceCIDR, "ClusterIP", clusterIPStr)
continue
}
} else {
mask := net.CIDRMask(mask, mask)
clusterIP := clusterIP.Mask(mask)
// If the calculated Service CIDR doesn't exist, generate a new Service CIDR with the ClusterIP.
newServiceCIDR = &net.IPNet{IP: clusterIP, Mask: mask}
}
if isIPv6 {
curServiceIPv6CIDR = newServiceCIDR
} else {
curServiceIPv4CIDR = newServiceCIDR
}
updated = true
}
}
if !updated {
return
}
func() {
d.Lock()
defer d.Unlock()
if d.serviceIPv4CIDR != curServiceIPv4CIDR {
d.serviceIPv4CIDR = curServiceIPv4CIDR
klog.InfoS("Service IPv4 CIDR was updated", "ServiceCIDR", curServiceIPv4CIDR)
newServiceCIDRs = append(newServiceCIDRs, curServiceIPv4CIDR)
}
if d.serviceIPv6CIDR != curServiceIPv6CIDR {
d.serviceIPv6CIDR = curServiceIPv6CIDR
klog.InfoS("Service IPv6 CIDR was updated", "ServiceCIDR", curServiceIPv6CIDR)
newServiceCIDRs = append(newServiceCIDRs, curServiceIPv6CIDR)
}
d.initialized = true
}()
for _, handler := range d.eventHandlers {
handler(newServiceCIDRs)
}
}