-
Notifications
You must be signed in to change notification settings - Fork 39.2k
/
kubelet_client.go
180 lines (149 loc) · 5.04 KB
/
kubelet_client.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
/*
Copyright 2014 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 client
import (
"net/http"
"strconv"
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
utilnet "k8s.io/apimachinery/pkg/util/net"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/transport"
"k8s.io/kubernetes/pkg/api/v1"
nodeutil "k8s.io/kubernetes/pkg/util/node"
)
type KubeletClientConfig struct {
// Default port - used if no information about Kubelet port can be found in Node.NodeStatus.DaemonEndpoints.
Port uint
ReadOnlyPort uint
EnableHttps bool
// PreferredAddressTypes - used to select an address from Node.NodeStatus.Addresses
PreferredAddressTypes []string
// TLSClientConfig contains settings to enable transport layer security
restclient.TLSClientConfig
// Server requires Bearer authentication
BearerToken string
// HTTPTimeout is used by the client to timeout http requests to Kubelet.
HTTPTimeout time.Duration
// Dial is a custom dialer used for the client
Dial utilnet.DialFunc
}
// ConnectionInfo provides the information needed to connect to a kubelet
type ConnectionInfo struct {
Scheme string
Hostname string
Port string
Transport http.RoundTripper
}
// ConnectionInfoGetter provides ConnectionInfo for the kubelet running on a named node
type ConnectionInfoGetter interface {
GetConnectionInfo(nodeName types.NodeName) (*ConnectionInfo, error)
}
func MakeTransport(config *KubeletClientConfig) (http.RoundTripper, error) {
tlsConfig, err := transport.TLSConfigFor(config.transportConfig())
if err != nil {
return nil, err
}
rt := http.DefaultTransport
if config.Dial != nil || tlsConfig != nil {
rt = utilnet.SetOldTransportDefaults(&http.Transport{
Dial: config.Dial,
TLSClientConfig: tlsConfig,
})
}
return transport.HTTPWrappersForConfig(config.transportConfig(), rt)
}
// transportConfig converts a client config to an appropriate transport config.
func (c *KubeletClientConfig) transportConfig() *transport.Config {
cfg := &transport.Config{
TLS: transport.TLSConfig{
CAFile: c.CAFile,
CAData: c.CAData,
CertFile: c.CertFile,
CertData: c.CertData,
KeyFile: c.KeyFile,
KeyData: c.KeyData,
},
BearerToken: c.BearerToken,
}
if c.EnableHttps && !cfg.HasCA() {
cfg.TLS.Insecure = true
}
return cfg
}
// NodeGetter defines an interface for looking up a node by name
type NodeGetter interface {
Get(name string, options metav1.GetOptions) (*v1.Node, error)
}
// NodeGetterFunc allows implementing NodeGetter with a function
type NodeGetterFunc func(name string, options metav1.GetOptions) (*v1.Node, error)
func (f NodeGetterFunc) Get(name string, options metav1.GetOptions) (*v1.Node, error) {
return f(name, options)
}
// NodeConnectionInfoGetter obtains connection info from the status of a Node API object
type NodeConnectionInfoGetter struct {
// nodes is used to look up Node objects
nodes NodeGetter
// scheme is the scheme to use to connect to all kubelets
scheme string
// defaultPort is the port to use if no Kubelet endpoint port is recorded in the node status
defaultPort int
// transport is the transport to use to send a request to all kubelets
transport http.RoundTripper
// preferredAddressTypes specifies the preferred order to use to find a node address
preferredAddressTypes []v1.NodeAddressType
}
func NewNodeConnectionInfoGetter(nodes NodeGetter, config KubeletClientConfig) (ConnectionInfoGetter, error) {
scheme := "http"
if config.EnableHttps {
scheme = "https"
}
transport, err := MakeTransport(&config)
if err != nil {
return nil, err
}
types := []v1.NodeAddressType{}
for _, t := range config.PreferredAddressTypes {
types = append(types, v1.NodeAddressType(t))
}
return &NodeConnectionInfoGetter{
nodes: nodes,
scheme: scheme,
defaultPort: int(config.Port),
transport: transport,
preferredAddressTypes: types,
}, nil
}
func (k *NodeConnectionInfoGetter) GetConnectionInfo(nodeName types.NodeName) (*ConnectionInfo, error) {
node, err := k.nodes.Get(string(nodeName), metav1.GetOptions{})
if err != nil {
return nil, err
}
// Find a kubelet-reported address, using preferred address type
host, err := nodeutil.GetPreferredNodeAddress(node, k.preferredAddressTypes)
if err != nil {
return nil, err
}
// Use the kubelet-reported port, if present
port := int(node.Status.DaemonEndpoints.KubeletEndpoint.Port)
if port <= 0 {
port = k.defaultPort
}
return &ConnectionInfo{
Scheme: k.scheme,
Hostname: host,
Port: strconv.Itoa(port),
Transport: k.transport,
}, nil
}