forked from coredns/multicluster
-
Notifications
You must be signed in to change notification settings - Fork 0
/
endpoint.go
226 lines (195 loc) · 6.21 KB
/
endpoint.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
package object
import (
"fmt"
mcs "sigs.k8s.io/mcs-api/pkg/apis/v1alpha1"
discovery "k8s.io/api/discovery/v1"
discoveryV1beta1 "k8s.io/api/discovery/v1beta1"
meta "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
)
const (
LabelClusterId = "multicluster.kubernetes.io/source-cluster"
)
// Endpoints is a stripped down api.Endpoints with only the items we need for CoreDNS.
type Endpoints struct {
// Don't add new fields to this struct without talking to the CoreDNS maintainers.
Version string
ClusterId string
Name string
Namespace string
Index string
IndexIP []string
Subsets []EndpointSubset
*Empty
}
// EndpointSubset is a group of addresses with a common set of ports. The
// expanded set of endpoints is the Cartesian product of Addresses x Ports.
type EndpointSubset struct {
Addresses []EndpointAddress
Ports []EndpointPort
}
// EndpointAddress is a tuple that describes single IP address.
type EndpointAddress struct {
IP string
Hostname string
NodeName string
TargetRefName string
}
// EndpointPort is a tuple that describes a single port.
type EndpointPort struct {
Port int32
Name string
Protocol string
}
// EndpointsKey returns a string using for the index.
func EndpointsKey(name, namespace string) string { return name + "." + namespace }
// EndpointSliceToEndpoints converts a *discovery.EndpointSlice to a *Endpoints.
func EndpointSliceToEndpoints(obj meta.Object) (meta.Object, error) {
ends, ok := obj.(*discovery.EndpointSlice)
if !ok {
return nil, fmt.Errorf("unexpected object %v", obj)
}
e := &Endpoints{
Version: ends.GetResourceVersion(),
ClusterId: ends.Annotations[LabelClusterId],
Name: ends.GetName(),
Namespace: ends.GetNamespace(),
Index: EndpointsKey(ends.Labels[mcs.LabelServiceName], ends.GetNamespace()),
Subsets: make([]EndpointSubset, 1),
}
if len(ends.Ports) == 0 {
// Add sentinel if there are no ports.
e.Subsets[0].Ports = []EndpointPort{{Port: -1}}
} else {
e.Subsets[0].Ports = make([]EndpointPort, len(ends.Ports))
for k, p := range ends.Ports {
ep := EndpointPort{Port: *p.Port, Name: *p.Name, Protocol: string(*p.Protocol)}
e.Subsets[0].Ports[k] = ep
}
}
for _, end := range ends.Endpoints {
if !endpointsliceReady(end.Conditions.Ready) {
continue
}
for _, a := range end.Addresses {
ea := EndpointAddress{IP: a}
if end.Hostname != nil {
ea.Hostname = *end.Hostname
}
if end.TargetRef != nil {
ea.TargetRefName = end.TargetRef.Name
}
if end.NodeName != nil {
ea.NodeName = *end.NodeName
}
e.Subsets[0].Addresses = append(e.Subsets[0].Addresses, ea)
e.IndexIP = append(e.IndexIP, a)
}
}
*ends = discovery.EndpointSlice{}
return e, nil
}
// EndpointSliceV1beta1ToEndpoints converts a v1beta1 *discovery.EndpointSlice to a *Endpoints.
func EndpointSliceV1beta1ToEndpoints(obj meta.Object) (meta.Object, error) {
ends, ok := obj.(*discoveryV1beta1.EndpointSlice)
if !ok {
return nil, fmt.Errorf("unexpected object %v", obj)
}
e := &Endpoints{
Version: ends.GetResourceVersion(),
Name: ends.GetName(),
Namespace: ends.GetNamespace(),
Index: EndpointsKey(ends.Labels[mcs.LabelServiceName], ends.GetNamespace()),
Subsets: make([]EndpointSubset, 1),
}
if len(ends.Ports) == 0 {
// Add sentinel if there are no ports.
e.Subsets[0].Ports = []EndpointPort{{Port: -1}}
} else {
e.Subsets[0].Ports = make([]EndpointPort, len(ends.Ports))
for k, p := range ends.Ports {
ep := EndpointPort{Port: *p.Port, Name: *p.Name, Protocol: string(*p.Protocol)}
e.Subsets[0].Ports[k] = ep
}
}
for _, end := range ends.Endpoints {
if !endpointsliceReady(end.Conditions.Ready) {
continue
}
for _, a := range end.Addresses {
ea := EndpointAddress{IP: a}
if end.Hostname != nil {
ea.Hostname = *end.Hostname
}
if end.TargetRef != nil {
ea.TargetRefName = end.TargetRef.Name
}
// EndpointSlice does not contain NodeName, leave blank
e.Subsets[0].Addresses = append(e.Subsets[0].Addresses, ea)
e.IndexIP = append(e.IndexIP, a)
}
}
*ends = discoveryV1beta1.EndpointSlice{}
return e, nil
}
func endpointsliceReady(ready *bool) bool {
// Per API docs: a nil value indicates an unknown state. In most cases consumers
// should interpret this unknown state as ready.
if ready == nil {
return true
}
return *ready
}
// CopyWithoutSubsets copies e, without the subsets.
func (e *Endpoints) CopyWithoutSubsets() *Endpoints {
e1 := &Endpoints{
Version: e.Version,
Name: e.Name,
Namespace: e.Namespace,
Index: e.Index,
IndexIP: make([]string, len(e.IndexIP)),
}
copy(e1.IndexIP, e.IndexIP)
return e1
}
var _ runtime.Object = &Endpoints{}
// DeepCopyObject implements the ObjectKind interface.
func (e *Endpoints) DeepCopyObject() runtime.Object {
e1 := &Endpoints{
Version: e.Version,
Name: e.Name,
Namespace: e.Namespace,
Index: e.Index,
IndexIP: make([]string, len(e.IndexIP)),
Subsets: make([]EndpointSubset, len(e.Subsets)),
}
copy(e1.IndexIP, e.IndexIP)
for i, eps := range e.Subsets {
sub := EndpointSubset{
Addresses: make([]EndpointAddress, len(eps.Addresses)),
Ports: make([]EndpointPort, len(eps.Ports)),
}
for j, a := range eps.Addresses {
ea := EndpointAddress{IP: a.IP, Hostname: a.Hostname, NodeName: a.NodeName, TargetRefName: a.TargetRefName}
sub.Addresses[j] = ea
}
for k, p := range eps.Ports {
ep := EndpointPort{Port: p.Port, Name: p.Name, Protocol: p.Protocol}
sub.Ports[k] = ep
}
e1.Subsets[i] = sub
}
return e1
}
// GetNamespace implements the metav1.Object interface.
func (e *Endpoints) GetNamespace() string { return e.Namespace }
// SetNamespace implements the metav1.Object interface.
func (e *Endpoints) SetNamespace(namespace string) {}
// GetName implements the metav1.Object interface.
func (e *Endpoints) GetName() string { return e.Name }
// SetName implements the metav1.Object interface.
func (e *Endpoints) SetName(name string) {}
// GetResourceVersion implements the metav1.Object interface.
func (e *Endpoints) GetResourceVersion() string { return e.Version }
// SetResourceVersion implements the metav1.Object interface.
func (e *Endpoints) SetResourceVersion(version string) {}