forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 3
/
extender.go
252 lines (220 loc) · 6.83 KB
/
extender.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
/*
Copyright 2015 The Kubernetes 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 core
import (
"bytes"
"encoding/json"
"fmt"
"net/http"
"strings"
"time"
"k8s.io/api/core/v1"
utilnet "k8s.io/apimachinery/pkg/util/net"
restclient "k8s.io/client-go/rest"
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
schedulerapi "k8s.io/kubernetes/plugin/pkg/scheduler/api"
"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
)
const (
DefaultExtenderTimeout = 5 * time.Second
)
// HTTPExtender implements the algorithm.SchedulerExtender interface.
type HTTPExtender struct {
extenderURL string
filterVerb string
prioritizeVerb string
bindVerb string
weight int
client *http.Client
nodeCacheCapable bool
}
func makeTransport(config *schedulerapi.ExtenderConfig) (http.RoundTripper, error) {
var cfg restclient.Config
if config.TLSConfig != nil {
cfg.TLSClientConfig = *config.TLSConfig
}
if config.EnableHttps {
hasCA := len(cfg.CAFile) > 0 || len(cfg.CAData) > 0
if !hasCA {
cfg.Insecure = true
}
}
tlsConfig, err := restclient.TLSConfigFor(&cfg)
if err != nil {
return nil, err
}
if tlsConfig != nil {
return utilnet.SetTransportDefaults(&http.Transport{
TLSClientConfig: tlsConfig,
}), nil
}
return utilnet.SetTransportDefaults(&http.Transport{}), nil
}
func NewHTTPExtender(config *schedulerapi.ExtenderConfig) (algorithm.SchedulerExtender, error) {
if config.HTTPTimeout.Nanoseconds() == 0 {
config.HTTPTimeout = time.Duration(DefaultExtenderTimeout)
}
transport, err := makeTransport(config)
if err != nil {
return nil, err
}
client := &http.Client{
Transport: transport,
Timeout: config.HTTPTimeout,
}
return &HTTPExtender{
extenderURL: config.URLPrefix,
filterVerb: config.FilterVerb,
prioritizeVerb: config.PrioritizeVerb,
bindVerb: config.BindVerb,
weight: config.Weight,
client: client,
nodeCacheCapable: config.NodeCacheCapable,
}, nil
}
// Filter based on extender implemented predicate functions. The filtered list is
// expected to be a subset of the supplied list. failedNodesMap optionally contains
// the list of failed nodes and failure reasons.
func (h *HTTPExtender) Filter(pod *v1.Pod, nodes []*v1.Node, nodeNameToInfo map[string]*schedulercache.NodeInfo) ([]*v1.Node, schedulerapi.FailedNodesMap, error) {
var (
result schedulerapi.ExtenderFilterResult
nodeList *v1.NodeList
nodeNames *[]string
nodeResult []*v1.Node
args *schedulerapi.ExtenderArgs
)
if h.filterVerb == "" {
return nodes, schedulerapi.FailedNodesMap{}, nil
}
if h.nodeCacheCapable {
nodeNameSlice := make([]string, 0, len(nodes))
for _, node := range nodes {
nodeNameSlice = append(nodeNameSlice, node.Name)
}
nodeNames = &nodeNameSlice
} else {
nodeList = &v1.NodeList{}
for _, node := range nodes {
nodeList.Items = append(nodeList.Items, *node)
}
}
args = &schedulerapi.ExtenderArgs{
Pod: *pod,
Nodes: nodeList,
NodeNames: nodeNames,
}
if err := h.send(h.filterVerb, args, &result); err != nil {
return nil, nil, err
}
if result.Error != "" {
return nil, nil, fmt.Errorf(result.Error)
}
if h.nodeCacheCapable && result.NodeNames != nil {
nodeResult = make([]*v1.Node, 0, len(*result.NodeNames))
for i := range *result.NodeNames {
nodeResult = append(nodeResult, nodeNameToInfo[(*result.NodeNames)[i]].Node())
}
} else if result.Nodes != nil {
nodeResult = make([]*v1.Node, 0, len(result.Nodes.Items))
for i := range result.Nodes.Items {
nodeResult = append(nodeResult, &result.Nodes.Items[i])
}
}
return nodeResult, result.FailedNodes, nil
}
// Prioritize based on extender implemented priority functions. Weight*priority is added
// up for each such priority function. The returned score is added to the score computed
// by Kubernetes scheduler. The total score is used to do the host selection.
func (h *HTTPExtender) Prioritize(pod *v1.Pod, nodes []*v1.Node) (*schedulerapi.HostPriorityList, int, error) {
var (
result schedulerapi.HostPriorityList
nodeList *v1.NodeList
nodeNames *[]string
args *schedulerapi.ExtenderArgs
)
if h.prioritizeVerb == "" {
result := schedulerapi.HostPriorityList{}
for _, node := range nodes {
result = append(result, schedulerapi.HostPriority{Host: node.Name, Score: 0})
}
return &result, 0, nil
}
if h.nodeCacheCapable {
nodeNameSlice := make([]string, 0, len(nodes))
for _, node := range nodes {
nodeNameSlice = append(nodeNameSlice, node.Name)
}
nodeNames = &nodeNameSlice
} else {
nodeList = &v1.NodeList{}
for _, node := range nodes {
nodeList.Items = append(nodeList.Items, *node)
}
}
args = &schedulerapi.ExtenderArgs{
Pod: *pod,
Nodes: nodeList,
NodeNames: nodeNames,
}
if err := h.send(h.prioritizeVerb, args, &result); err != nil {
return nil, 0, err
}
return &result, h.weight, nil
}
// Bind delegates the action of binding a pod to a node to the extender.
func (h *HTTPExtender) Bind(binding *v1.Binding) error {
var result schedulerapi.ExtenderBindingResult
if !h.IsBinder() {
// This shouldn't happen as this extender wouldn't have become a Binder.
return fmt.Errorf("Unexpected empty bindVerb in extender")
}
req := &schedulerapi.ExtenderBindingArgs{
PodName: binding.Name,
PodNamespace: binding.Namespace,
PodUID: binding.UID,
Node: binding.Target.Name,
}
if err := h.send(h.bindVerb, &req, &result); err != nil {
return err
}
if result.Error != "" {
return fmt.Errorf(result.Error)
}
return nil
}
// IsBinder returns whether this extender is configured for the Bind method.
func (h *HTTPExtender) IsBinder() bool {
return h.bindVerb != ""
}
// Helper function to send messages to the extender
func (h *HTTPExtender) send(action string, args interface{}, result interface{}) error {
out, err := json.Marshal(args)
if err != nil {
return err
}
url := strings.TrimRight(h.extenderURL, "/") + "/" + action
req, err := http.NewRequest("POST", url, bytes.NewReader(out))
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
resp, err := h.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("Failed %v with extender at URL %v, code %v", action, h.extenderURL, resp.StatusCode)
}
return json.NewDecoder(resp.Body).Decode(result)
}