This repository has been archived by the owner on Sep 18, 2020. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 161
/
waagent.go
117 lines (100 loc) · 2.63 KB
/
waagent.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
// Copyright 2015 CoreOS, Inc.
//
// 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 waagent
import (
"encoding/xml"
"io/ioutil"
"log"
"net"
"os"
"path"
"github.com/coreos/coreos-cloudinit/datasource"
)
type waagent struct {
root string
readFile func(filename string) ([]byte, error)
}
func NewDatasource(root string) *waagent {
return &waagent{root, ioutil.ReadFile}
}
func (a *waagent) IsAvailable() bool {
_, err := os.Stat(path.Join(a.root, "provisioned"))
return !os.IsNotExist(err)
}
func (a *waagent) AvailabilityChanges() bool {
return true
}
func (a *waagent) ConfigRoot() string {
return a.root
}
func (a *waagent) FetchMetadata() (metadata datasource.Metadata, err error) {
var metadataBytes []byte
if metadataBytes, err = a.tryReadFile(path.Join(a.root, "SharedConfig.xml")); err != nil {
return
}
if len(metadataBytes) == 0 {
return
}
type Instance struct {
Id string `xml:"id,attr"`
Address string `xml:"address,attr"`
InputEndpoints struct {
Endpoints []struct {
LoadBalancedPublicAddress string `xml:"loadBalancedPublicAddress,attr"`
} `xml:"Endpoint"`
}
}
type SharedConfig struct {
Incarnation struct {
Instance string `xml:"instance,attr"`
}
Instances struct {
Instances []Instance `xml:"Instance"`
}
}
var m SharedConfig
if err = xml.Unmarshal(metadataBytes, &m); err != nil {
return
}
var instance Instance
for _, i := range m.Instances.Instances {
if i.Id == m.Incarnation.Instance {
instance = i
break
}
}
metadata.PrivateIPv4 = net.ParseIP(instance.Address)
for _, e := range instance.InputEndpoints.Endpoints {
host, _, err := net.SplitHostPort(e.LoadBalancedPublicAddress)
if err == nil {
metadata.PublicIPv4 = net.ParseIP(host)
break
}
}
return
}
func (a *waagent) FetchUserdata() ([]byte, error) {
return a.tryReadFile(path.Join(a.root, "CustomData"))
}
func (a *waagent) Type() string {
return "waagent"
}
func (a *waagent) tryReadFile(filename string) ([]byte, error) {
log.Printf("Attempting to read from %q\n", filename)
data, err := a.readFile(filename)
if os.IsNotExist(err) {
err = nil
}
return data, err
}