forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 1
/
rest.go
281 lines (258 loc) · 9.2 KB
/
rest.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
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*
Copyright 2014 Google Inc. All rights reserved.
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 service
import (
"fmt"
"math/rand"
"net"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api/validation"
"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider"
"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/minion"
"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
"github.com/golang/glog"
)
// REST adapts a service registry into apiserver's RESTStorage model.
type REST struct {
registry Registry
cloud cloudprovider.Interface
machines minion.Registry
portalMgr *ipAllocator
}
// NewREST returns a new REST.
func NewREST(registry Registry, cloud cloudprovider.Interface, machines minion.Registry, portalNet *net.IPNet) *REST {
// TODO: Before we can replicate masters, this has to be synced (e.g. lives in etcd)
ipa := newIPAllocator(portalNet)
if ipa == nil {
glog.Fatalf("Failed to create an IP allocator. Is subnet '%v' valid?", portalNet)
}
reloadIPsFromStorage(ipa, registry)
return &REST{
registry: registry,
cloud: cloud,
machines: machines,
portalMgr: ipa,
}
}
// Helper: mark all previously allocated IPs in the allocator.
func reloadIPsFromStorage(ipa *ipAllocator, registry Registry) {
services, err := registry.ListServices(api.NewContext())
if err != nil {
// This is really bad.
glog.Errorf("can't list services to init service REST: %v", err)
return
}
for i := range services.Items {
service := &services.Items[i]
if service.Spec.PortalIP == "" {
glog.Warningf("service %q has no PortalIP", service.Name)
continue
}
if err := ipa.Allocate(net.ParseIP(service.Spec.PortalIP)); err != nil {
// This is really bad.
glog.Errorf("service %q PortalIP %s could not be allocated: %v", service.Name, service.Spec.PortalIP, err)
}
}
}
func (rs *REST) Create(ctx api.Context, obj runtime.Object) (<-chan apiserver.RESTResult, error) {
service := obj.(*api.Service)
if !api.ValidNamespace(ctx, &service.ObjectMeta) {
return nil, errors.NewConflict("service", service.Namespace, fmt.Errorf("Service.Namespace does not match the provided context"))
}
if errs := validation.ValidateService(service, rs.registry, ctx); len(errs) > 0 {
return nil, errors.NewInvalid("service", service.Name, errs)
}
api.FillObjectMetaSystemFields(ctx, &service.ObjectMeta)
if service.Spec.PortalIP == "" {
// Allocate next available.
if ip, err := rs.portalMgr.AllocateNext(); err != nil {
return nil, err
} else {
service.Spec.PortalIP = ip.String()
}
} else {
// Try to respect the requested IP.
if err := rs.portalMgr.Allocate(net.ParseIP(service.Spec.PortalIP)); err != nil {
el := errors.ValidationErrorList{errors.NewFieldInvalid("spec.portalIP", service.Spec.PortalIP, err.Error())}
return nil, errors.NewInvalid("service", service.Name, el)
}
}
return apiserver.MakeAsync(func() (runtime.Object, error) {
// TODO: Consider moving this to a rectification loop, so that we make/remove external load balancers
// correctly no matter what http operations happen.
// TODO: Get rid of ProxyPort.
service.Spec.ProxyPort = 0
if service.Spec.CreateExternalLoadBalancer {
if rs.cloud == nil {
return nil, fmt.Errorf("requested an external service, but no cloud provider supplied.")
}
if service.Spec.Protocol != api.ProtocolTCP {
// TODO: Support UDP here too.
return nil, fmt.Errorf("external load balancers for non TCP services are not currently supported.")
}
balancer, ok := rs.cloud.TCPLoadBalancer()
if !ok {
return nil, fmt.Errorf("the cloud provider does not support external TCP load balancers.")
}
zones, ok := rs.cloud.Zones()
if !ok {
return nil, fmt.Errorf("the cloud provider does not support zone enumeration.")
}
hosts, err := rs.machines.ListMinions(ctx)
if err != nil {
return nil, err
}
zone, err := zones.GetZone()
if err != nil {
return nil, err
}
if len(service.Spec.PublicIPs) > 0 {
for _, publicIP := range service.Spec.PublicIPs {
_, err = balancer.CreateTCPLoadBalancer(service.Name, zone.Region, net.ParseIP(publicIP), service.Spec.Port, hostsFromMinionList(hosts))
if err != nil {
// TODO: have to roll-back any successful calls.
return nil, err
}
}
} else {
ip, err := balancer.CreateTCPLoadBalancer(service.Name, zone.Region, nil, service.Spec.Port, hostsFromMinionList(hosts))
if err != nil {
return nil, err
}
service.Spec.PublicIPs = []string{ip.String()}
}
}
err := rs.registry.CreateService(ctx, service)
if err != nil {
return nil, err
}
return rs.registry.GetService(ctx, service.Name)
}), nil
}
func hostsFromMinionList(list *api.NodeList) []string {
result := make([]string, len(list.Items))
for ix := range list.Items {
result[ix] = list.Items[ix].Name
}
return result
}
func (rs *REST) Delete(ctx api.Context, id string) (<-chan apiserver.RESTResult, error) {
service, err := rs.registry.GetService(ctx, id)
if err != nil {
return nil, err
}
rs.portalMgr.Release(net.ParseIP(service.Spec.PortalIP))
return apiserver.MakeAsync(func() (runtime.Object, error) {
rs.deleteExternalLoadBalancer(service)
return &api.Status{Status: api.StatusSuccess}, rs.registry.DeleteService(ctx, id)
}), nil
}
func (rs *REST) Get(ctx api.Context, id string) (runtime.Object, error) {
service, err := rs.registry.GetService(ctx, id)
if err != nil {
return nil, err
}
return service, err
}
// TODO: implement field selector?
func (rs *REST) List(ctx api.Context, label, field labels.Selector) (runtime.Object, error) {
list, err := rs.registry.ListServices(ctx)
if err != nil {
return nil, err
}
var filtered []api.Service
for _, service := range list.Items {
if label.Matches(labels.Set(service.Labels)) {
filtered = append(filtered, service)
}
}
list.Items = filtered
return list, err
}
// Watch returns Services events via a watch.Interface.
// It implements apiserver.ResourceWatcher.
func (rs *REST) Watch(ctx api.Context, label, field labels.Selector, resourceVersion string) (watch.Interface, error) {
return rs.registry.WatchServices(ctx, label, field, resourceVersion)
}
func (*REST) New() runtime.Object {
return &api.Service{}
}
func (rs *REST) Update(ctx api.Context, obj runtime.Object) (<-chan apiserver.RESTResult, error) {
service := obj.(*api.Service)
if !api.ValidNamespace(ctx, &service.ObjectMeta) {
return nil, errors.NewConflict("service", service.Namespace, fmt.Errorf("Service.Namespace does not match the provided context"))
}
if errs := validation.ValidateService(service, rs.registry, ctx); len(errs) > 0 {
return nil, errors.NewInvalid("service", service.Name, errs)
}
return apiserver.MakeAsync(func() (runtime.Object, error) {
cur, err := rs.registry.GetService(ctx, service.Name)
if err != nil {
return nil, err
}
if service.Spec.PortalIP != "" && service.Spec.PortalIP != cur.Spec.PortalIP {
el := errors.ValidationErrorList{errors.NewFieldInvalid("spec.portalIP", service.Spec.PortalIP, "field is immutable")}
return nil, errors.NewInvalid("service", service.Name, el)
}
// Copy over non-user fields.
service.Spec.ProxyPort = cur.Spec.ProxyPort
// TODO: check to see if external load balancer status changed
err = rs.registry.UpdateService(ctx, service)
if err != nil {
return nil, err
}
return rs.registry.GetService(ctx, service.Name)
}), nil
}
// ResourceLocation returns a URL to which one can send traffic for the specified service.
func (rs *REST) ResourceLocation(ctx api.Context, id string) (string, error) {
e, err := rs.registry.GetEndpoints(ctx, id)
if err != nil {
return "", err
}
if len(e.Endpoints) == 0 {
return "", fmt.Errorf("no endpoints available for %v", id)
}
// We leave off the scheme ('http://') because we have no idea what sort of server
// is listening at this endpoint.
return e.Endpoints[rand.Intn(len(e.Endpoints))], nil
}
func (rs *REST) deleteExternalLoadBalancer(service *api.Service) error {
if !service.Spec.CreateExternalLoadBalancer || rs.cloud == nil {
return nil
}
zones, ok := rs.cloud.Zones()
if !ok {
// We failed to get zone enumerator.
// As this should have failed when we tried in "create" too,
// assume external load balancer was never created.
return nil
}
balancer, ok := rs.cloud.TCPLoadBalancer()
if !ok {
// See comment above.
return nil
}
zone, err := zones.GetZone()
if err != nil {
return err
}
if err := balancer.DeleteTCPLoadBalancer(service.Name, zone.Region); err != nil {
return err
}
return nil
}