wesher/main.go

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package main // import "github.com/costela/wesher"
import (
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"fmt"
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"os"
"os/signal"
"syscall"
"time"
"github.com/cenkalti/backoff"
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"github.com/sirupsen/logrus"
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"github.com/costela/wesher/etchosts"
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)
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var version = "dev"
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func main() {
config, err := loadConfig()
if err != nil {
logrus.Fatal(err)
}
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if config.Version {
fmt.Println(version)
os.Exit(0)
}
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logLevel, err := logrus.ParseLevel(config.LogLevel)
if err != nil {
logrus.Fatalf("could not parse loglevel: %s", err)
}
logrus.SetLevel(logLevel)
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wg, err := newWGConfig(config.Interface, config.WireguardPort)
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if err != nil {
logrus.Fatal(err)
}
cluster, err := newCluster(config, wg)
if err != nil {
logrus.Fatalf("could not create cluster: %s", err)
}
nodec, errc := cluster.members() // avoid deadlocks by starting before join
if err := backoff.RetryNotify(
func() error { return cluster.join(config.Join) },
backoff.NewExponentialBackOff(),
func(err error, dur time.Duration) {
logrus.Errorf("could not join cluster, retrying in %s: %s", dur, err)
},
); err != nil {
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logrus.Fatalf("could not join cluster: %s", err)
}
incomingSigs := make(chan os.Signal, 1)
signal.Notify(incomingSigs, syscall.SIGTERM, os.Interrupt)
logrus.Debug("waiting for cluster events")
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for {
select {
case nodes := <-nodec:
logrus.Info("cluster members:\n")
for _, node := range nodes {
logrus.Infof("\taddr: %s, overlay: %s, pubkey: %s", node.Addr, node.OverlayAddr, node.PubKey)
}
if err := wg.setUpInterface(nodes); err != nil {
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logrus.Errorf("could not up interface: %s", err)
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wg.downInterface()
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}
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if !config.NoEtcHosts {
if err := writeToEtcHosts(nodes); err != nil {
logrus.Errorf("could not write hosts entries: %s", err)
}
}
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case errs := <-errc:
logrus.Errorf("could not receive node info: %s", errs)
case <-incomingSigs:
logrus.Info("terminating...")
cluster.leave()
if !config.NoEtcHosts {
if err := writeToEtcHosts(nil); err != nil {
logrus.Errorf("could not remove stale hosts entries: %s", err)
}
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}
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if err := wg.downInterface(); err != nil {
logrus.Errorf("could not down interface: %s", err)
}
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os.Exit(0)
}
}
}
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func writeToEtcHosts(nodes []node) error {
hosts := make(map[string][]string, len(nodes))
for _, n := range nodes {
hosts[n.OverlayAddr.IP.String()] = []string{n.Name}
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}
hostsFile := &etchosts.EtcHosts{
Logger: logrus.StandardLogger(),
}
return hostsFile.WriteEntries(hosts)
}