/
informer.go
142 lines (116 loc) · 2.84 KB
/
informer.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
package main
import (
"encoding/xml"
"flag"
"fmt"
"os"
"regexp"
"sort"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/daemonl/informer/objects"
"sync"
)
var configDir string
var runGroup string
var dryRun bool
var solo bool
func init() {
flag.StringVar(&configDir, "config", "/etc/informer/conf.d/", "Config directory")
flag.StringVar(&runGroup, "group", "", "When set, only run this group, otherwise runs root")
flag.BoolVar(&dryRun, "dry", false, "When true, won't send mail or call APIs")
flag.BoolVar(&solo, "solo", false, "Skip Crosschecks")
}
func flagWg(wg *sync.WaitGroup, donechan chan bool) {
wg.Wait()
donechan <- true
}
type FilesByName []os.FileInfo
func (s FilesByName) Len() int { return len(s) }
func (s FilesByName) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s FilesByName) Less(i, j int) bool { return s[i].Name() < s[j].Name() }
func loadConfig(dirName string) (*objects.Core, error) {
if bucket, key, match := s3Components(configDir); match {
return loadS3Config(bucket, key)
}
dir, err := os.Open(os.ExpandEnv(dirName))
if err != nil {
return nil, err
}
s, err := dir.Stat()
if err != nil {
return nil, err
}
cfg := &objects.Core{}
if !s.IsDir() {
decoder := xml.NewDecoder(dir)
err = decoder.Decode(&cfg)
return cfg, err
}
files, err := dir.Readdir(-1)
if err != nil {
return nil, err
}
sort.Sort(FilesByName(files))
for _, fInfo := range files {
file, err := os.Open(dirName + fInfo.Name())
if err != nil {
return nil, err
}
decoder := xml.NewDecoder(file)
err = decoder.Decode(&cfg)
if err != nil {
return nil, fmt.Errorf("Decoding %s: %s", fInfo.Name(), err.Error())
}
}
return cfg, nil
}
func loadS3Config(bucket, key string) (*objects.Core, error) {
sess, err := session.NewSession()
if err != nil {
return nil, err
}
client := s3.New(sess)
listOutput, err := client.ListObjects(&s3.ListObjectsInput{
Prefix: aws.String(key),
Bucket: aws.String(bucket),
})
if err != nil {
return nil, err
}
cfg := &objects.Core{}
for _, val := range listOutput.Contents {
getOutput, err := client.GetObject(&s3.GetObjectInput{
Bucket: aws.String(bucket),
Key: val.Key,
})
if err != nil {
return nil, err
}
if err := xml.NewDecoder(getOutput.Body).Decode(&cfg); err != nil {
return nil, err
}
}
return cfg, nil
}
var reS3Bucket = regexp.MustCompile(`s3://([^/]+)/(.*)`)
func main() {
flag.Parse()
core, err := loadConfig(configDir)
if err != nil {
fmt.Fprintln(os.Stderr, err.Error())
os.Exit(1)
return
}
core.Run(runGroup)
}
func s3Components(name string) (string, string, bool) {
s3Parts := reS3Bucket.FindStringSubmatch(name)
if len(s3Parts) < 2 {
return "", "", false
}
bucket := s3Parts[1]
key := s3Parts[2]
return bucket, key, true
}