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main.go
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main.go
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package main
import (
"context"
"crypto/tls"
"flag"
"fmt"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/golang/glog"
)
func main() {
var parameters WhSvrParameters
flag.IntVar(¶meters.port, "port", 443, "Webhook server port.")
flag.StringVar(¶meters.certFile, "tlsCertFile", "/etc/webhook/certs/cert.pem", "File containing the x509 Certificate for HTTPS.")
flag.StringVar(¶meters.keyFile, "tlsKeyFile", "/etc/webhook/certs/key.pem", "File containing the x509 private key to --tlsCertFile.")
flag.StringVar(¶meters.dnsCfgFile, "dnsCfgFile", "/etc/webhook/config/dnsconfig.yaml", "File containing the mutation configuration.")
flag.Parse()
dnsConfig, err := loadConfig(parameters.dnsCfgFile)
if err != nil {
glog.Errorf("Filed to load configuration: %v", err)
}
pair, err := tls.LoadX509KeyPair(parameters.certFile, parameters.keyFile)
if err != nil {
glog.Errorf("Filed to load key pair: %v", err)
}
whsvr := &WebhookServer {
dnsConfig: dnsConfig,
server: &http.Server {
Addr: fmt.Sprintf(":%v", parameters.port),
TLSConfig: &tls.Config{Certificates: []tls.Certificate{pair}},
},
}
// define http server and server handler
mux := http.NewServeMux()
mux.HandleFunc("/mutate", whsvr.serve)
whsvr.server.Handler = mux
glog.Infof("Starting wenhook server ...")
// start webhook server in new rountine
go func() {
if err := whsvr.server.ListenAndServeTLS("", ""); err != nil {
glog.Errorf("Filed to listen and serve webhook server: %v", err)
}
}()
// listening OS shutdown singal
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)
<-signalChan
glog.Infof("Got OS shutdown signal, shutting down wenhook server gracefully...")
whsvr.server.Shutdown(context.Background())
}