-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
123 lines (102 loc) · 2.62 KB
/
main.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
package main
import (
"fmt"
"os"
"runtime/debug"
"log"
flags "github.com/jessevdk/go-flags"
"github.com/robfig/cron"
"syscall"
"os/signal"
)
const (
// application informations
Name = "go-azure-dns-sync"
Author = "Markus Blaschke"
Version = "0.2.0"
)
var (
argparser *flags.Parser
args []string
)
var opts struct {
Verbose []bool `short:"v" long:"verbose" description:"verbose mode"`
AzureConfig string ` long:"azure-config" description:"azure configuration file" default:"/etc/kubernetes/azure.json"`
Config string ` long:"config" description:"DNS configuration file" default:"/etc/azure-dns-sync/config.yml"`
UpdateTime string ` long:"update-time" description:"update time" default:"@every 10m"`
}
func handleArgParser() {
var err error
argparser = flags.NewParser(&opts, flags.Default)
args, err = argparser.Parse()
// check if there is an parse error
if err != nil {
if flagsErr, ok := err.(*flags.Error); ok && flagsErr.Type == flags.ErrHelp {
os.Exit(0)
} else {
fmt.Println()
argparser.WriteHelp(os.Stdout)
os.Exit(1)
}
}
}
func main() {
defer func() {
if r := recover(); r != nil {
fmt.Println()
message := fmt.Sprintf("%v", r)
if len(opts.Verbose) >= 2 {
fmt.Println(message)
debug.PrintStack()
} else {
fmt.Println(message)
}
os.Exit(255)
}
}()
// run cron
log.Printf("Starting %s daemon version %v\n", Name, Version)
// signal channel (listen on SIGINT, SIGTERM and SIGHUP)
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT)
signal.Notify(c, syscall.SIGTERM)
signal.Notify(c, syscall.SIGHUP)
handleArgParser()
// Init azure configuration
azureConf := AzureConfiguration{}
if err := azureConf.ReadFromConfig(opts.AzureConfig); err != nil {
log.Fatalf("[ERROR] %v\n", err)
}
rc, err := azureConf.GetClient()
if err != nil {
log.Fatalf("[ERROR] %v\n", err)
}
// read dns configuration
conf := DnsConfiguration{}
if err := conf.ReadFromConfig(opts.Config); err != nil {
log.Fatalf("Error: %v\n", err)
}
conf.SetAzureClient(rc)
// overwrite update time from configuration
if conf.UpdateTime != "" {
opts.UpdateTime = conf.UpdateTime
}
updateRun := func() {
log.Println("Run DNS updater...")
if err := conf.Run(); err != nil {
log.Fatalf("[ERROR] %v\n", err)
}
}
// first run
updateRun()
// create cron
log.Println(fmt.Sprintf("Starting CRON based loop (%s)...", opts.UpdateTime))
cron := cron.New()
cron.AddFunc(opts.UpdateTime, updateRun)
cron.Start()
s := <-c
log.Printf("Got signal: %v\n", s)
cron.Stop()
log.Println("Exit")
os.Exit(0)
}