forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
etcd.go
353 lines (300 loc) · 11.3 KB
/
etcd.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
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
/*
Copyright 2014 The Kubernetes Authors 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 etcd
import (
"fmt"
"net/http"
"net/url"
"path"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
etcderr "github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors/etcd"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api/rest"
"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/generic"
etcdgeneric "github.com/GoogleCloudPlatform/kubernetes/pkg/registry/generic/etcd"
genericrest "github.com/GoogleCloudPlatform/kubernetes/pkg/registry/generic/rest"
"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/pod"
"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
"github.com/GoogleCloudPlatform/kubernetes/pkg/tools"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util/fielderrors"
)
// PodStorage includes storage for pods and all sub resources
type PodStorage struct {
Pod *REST
Binding *BindingREST
Status *StatusREST
Log *LogREST
Proxy *ProxyREST
Exec *ExecREST
PortForward *PortForwardREST
}
// REST implements a RESTStorage for pods against etcd
type REST struct {
etcdgeneric.Etcd
}
// NewStorage returns a RESTStorage object that will work against pods.
func NewStorage(h tools.EtcdHelper, k client.ConnectionInfoGetter) PodStorage {
prefix := "/pods"
store := &etcdgeneric.Etcd{
NewFunc: func() runtime.Object { return &api.Pod{} },
NewListFunc: func() runtime.Object { return &api.PodList{} },
KeyRootFunc: func(ctx api.Context) string {
return etcdgeneric.NamespaceKeyRootFunc(ctx, prefix)
},
KeyFunc: func(ctx api.Context, name string) (string, error) {
return etcdgeneric.NamespaceKeyFunc(ctx, prefix, name)
},
ObjectNameFunc: func(obj runtime.Object) (string, error) {
return obj.(*api.Pod).Name, nil
},
PredicateFunc: func(label labels.Selector, field fields.Selector) generic.Matcher {
return pod.MatchPod(label, field)
},
EndpointName: "pods",
Helper: h,
}
statusStore := *store
bindings := &podLifecycle{}
store.CreateStrategy = pod.Strategy
store.UpdateStrategy = pod.Strategy
store.AfterUpdate = bindings.AfterUpdate
store.DeleteStrategy = pod.Strategy
store.ReturnDeletedObject = true
store.AfterDelete = bindings.AfterDelete
statusStore.UpdateStrategy = pod.StatusStrategy
return PodStorage{
Pod: &REST{*store},
Binding: &BindingREST{store: store},
Status: &StatusREST{store: &statusStore},
Log: &LogREST{store: store, kubeletConn: k},
Proxy: &ProxyREST{store: store},
Exec: &ExecREST{store: store, kubeletConn: k},
PortForward: &PortForwardREST{store: store, kubeletConn: k},
}
}
// Implement Redirector.
var _ = rest.Redirector(&REST{})
// ResourceLocation returns a pods location from its HostIP
func (r *REST) ResourceLocation(ctx api.Context, name string) (*url.URL, http.RoundTripper, error) {
return pod.ResourceLocation(r, ctx, name)
}
// BindingREST implements the REST endpoint for binding pods to nodes when etcd is in use.
type BindingREST struct {
store *etcdgeneric.Etcd
}
// New creates a new binding resource
func (r *BindingREST) New() runtime.Object {
return &api.Binding{}
}
var _ = rest.Creater(&BindingREST{})
// Create ensures a pod is bound to a specific host.
func (r *BindingREST) Create(ctx api.Context, obj runtime.Object) (out runtime.Object, err error) {
binding := obj.(*api.Binding)
// TODO: move me to a binding strategy
if len(binding.Target.Kind) != 0 && (binding.Target.Kind != "Node" && binding.Target.Kind != "Minion") {
return nil, errors.NewInvalid("binding", binding.Name, fielderrors.ValidationErrorList{fielderrors.NewFieldInvalid("to.kind", binding.Target.Kind, "must be empty, 'Node', or 'Minion'")})
}
if len(binding.Target.Name) == 0 {
return nil, errors.NewInvalid("binding", binding.Name, fielderrors.ValidationErrorList{fielderrors.NewFieldRequired("to.name")})
}
err = r.assignPod(ctx, binding.Name, binding.Target.Name, binding.Annotations)
out = &api.Status{Status: api.StatusSuccess}
return
}
// setPodHostAndAnnotations sets the given pod's host to 'machine' iff it was previously 'oldMachine' and merges
// the provided annotations with those of the pod.
// Returns the current state of the pod, or an error.
func (r *BindingREST) setPodHostAndAnnotations(ctx api.Context, podID, oldMachine, machine string, annotations map[string]string) (finalPod *api.Pod, err error) {
podKey, err := r.store.KeyFunc(ctx, podID)
if err != nil {
return nil, err
}
err = r.store.Helper.GuaranteedUpdate(podKey, &api.Pod{}, false, func(obj runtime.Object) (runtime.Object, uint64, error) {
pod, ok := obj.(*api.Pod)
if !ok {
return nil, 0, fmt.Errorf("unexpected object: %#v", obj)
}
if pod.Spec.NodeName != oldMachine {
return nil, 0, fmt.Errorf("pod %v is already assigned to node %q", pod.Name, pod.Spec.NodeName)
}
pod.Spec.NodeName = machine
if pod.Annotations == nil {
pod.Annotations = make(map[string]string)
}
for k, v := range annotations {
pod.Annotations[k] = v
}
finalPod = pod
return pod, 0, nil
})
return finalPod, err
}
// assignPod assigns the given pod to the given machine.
func (r *BindingREST) assignPod(ctx api.Context, podID string, machine string, annotations map[string]string) (err error) {
if _, err = r.setPodHostAndAnnotations(ctx, podID, "", machine, annotations); err != nil {
err = etcderr.InterpretGetError(err, "pod", podID)
err = etcderr.InterpretUpdateError(err, "pod", podID)
if _, ok := err.(*errors.StatusError); !ok {
err = errors.NewConflict("binding", podID, err)
}
}
return
}
type podLifecycle struct{}
func (h *podLifecycle) AfterUpdate(obj runtime.Object) error {
return nil
}
func (h *podLifecycle) AfterDelete(obj runtime.Object) error {
return nil
}
// StatusREST implements the REST endpoint for changing the status of a pod.
type StatusREST struct {
store *etcdgeneric.Etcd
}
// New creates a new pod resource
func (r *StatusREST) New() runtime.Object {
return &api.Pod{}
}
// Update alters the status subset of an object.
func (r *StatusREST) Update(ctx api.Context, obj runtime.Object) (runtime.Object, bool, error) {
return r.store.Update(ctx, obj)
}
// Implement GetterWithOptions
var _ = rest.GetterWithOptions(&LogREST{})
// LogREST implements the log endpoint for a Pod
type LogREST struct {
store *etcdgeneric.Etcd
kubeletConn client.ConnectionInfoGetter
}
// LogREST implements GetterWithOptions
var _ = rest.GetterWithOptions(&LogREST{})
// New creates a new Pod log options object
func (r *LogREST) New() runtime.Object {
// TODO - return a resource that represents a log
return &api.Pod{}
}
// Get retrieves a runtime.Object that will stream the contents of the pod log
func (r *LogREST) Get(ctx api.Context, name string, opts runtime.Object) (runtime.Object, error) {
logOpts, ok := opts.(*api.PodLogOptions)
if !ok {
return nil, fmt.Errorf("Invalid options object: %#v", opts)
}
location, transport, err := pod.LogLocation(r.store, r.kubeletConn, ctx, name, logOpts)
if err != nil {
return nil, err
}
return &genericrest.LocationStreamer{
Location: location,
Transport: transport,
ContentType: "text/plain",
Flush: logOpts.Follow,
}, nil
}
// NewGetOptions creates a new options object
func (r *LogREST) NewGetOptions() (runtime.Object, bool, string) {
return &api.PodLogOptions{}, false, ""
}
// ProxyREST implements the proxy subresource for a Pod
type ProxyREST struct {
store *etcdgeneric.Etcd
}
// Implement Connecter
var _ = rest.Connecter(&ProxyREST{})
var proxyMethods = []string{"GET", "POST", "PUT", "DELETE", "HEAD", "OPTIONS"}
// New returns an empty pod resource
func (r *ProxyREST) New() runtime.Object {
return &api.Pod{}
}
// ConnectMethods returns the list of HTTP methods that can be proxied
func (r *ProxyREST) ConnectMethods() []string {
return proxyMethods
}
// NewConnectOptions returns versioned resource that represents proxy parameters
func (r *ProxyREST) NewConnectOptions() (runtime.Object, bool, string) {
return &api.PodProxyOptions{}, true, "path"
}
// Connect returns a handler for the pod proxy
func (r *ProxyREST) Connect(ctx api.Context, id string, opts runtime.Object) (rest.ConnectHandler, error) {
proxyOpts, ok := opts.(*api.PodProxyOptions)
if !ok {
return nil, fmt.Errorf("Invalid options object: %#v", opts)
}
location, _, err := pod.ResourceLocation(r.store, ctx, id)
if err != nil {
return nil, err
}
location.Path = path.Join(location.Path, proxyOpts.Path)
return genericrest.NewUpgradeAwareProxyHandler(location, nil, false), nil
}
var upgradeableMethods = []string{"GET"}
// ExecREST implements the exec subresource for a Pod
type ExecREST struct {
store *etcdgeneric.Etcd
kubeletConn client.ConnectionInfoGetter
}
// Implement Connecter
var _ = rest.Connecter(&ExecREST{})
// New creates a new Pod object
func (r *ExecREST) New() runtime.Object {
return &api.Pod{}
}
// Connect returns a handler for the pod exec proxy
func (r *ExecREST) Connect(ctx api.Context, name string, opts runtime.Object) (rest.ConnectHandler, error) {
execOpts, ok := opts.(*api.PodExecOptions)
if !ok {
return nil, fmt.Errorf("Invalid options object: %#v", opts)
}
location, transport, err := pod.ExecLocation(r.store, r.kubeletConn, ctx, name, execOpts)
if err != nil {
return nil, err
}
return genericrest.NewUpgradeAwareProxyHandler(location, transport, true), nil
}
// NewConnectOptions returns the versioned object that represents exec parameters
func (r *ExecREST) NewConnectOptions() (runtime.Object, bool, string) {
return &api.PodExecOptions{}, false, ""
}
// ConnectMethods returns the methods supported by exec
func (r *ExecREST) ConnectMethods() []string {
return upgradeableMethods
}
// PortForwardREST implements the portforward subresource for a Pod
type PortForwardREST struct {
store *etcdgeneric.Etcd
kubeletConn client.ConnectionInfoGetter
}
// Implement Connecter
var _ = rest.Connecter(&PortForwardREST{})
// New returns an empty pod object
func (r *PortForwardREST) New() runtime.Object {
return &api.Pod{}
}
// NewConnectOptions returns nil since portforward doesn't take additional parameters
func (r *PortForwardREST) NewConnectOptions() (runtime.Object, bool, string) {
return nil, false, ""
}
// ConnectMethods returns the methods supported by portforward
func (r *PortForwardREST) ConnectMethods() []string {
return upgradeableMethods
}
// Connect returns a handler for the pod portforward proxy
func (r *PortForwardREST) Connect(ctx api.Context, name string, opts runtime.Object) (rest.ConnectHandler, error) {
location, transport, err := pod.PortForwardLocation(r.store, r.kubeletConn, ctx, name)
if err != nil {
return nil, err
}
return genericrest.NewUpgradeAwareProxyHandler(location, transport, true), nil
}