wesher/main.go

114 lines
3.2 KiB
Go

package main // import "github.com/costela/wesher"
import (
"fmt"
"net"
"os"
"os/signal"
"syscall"
"time"
"github.com/cenkalti/backoff"
"github.com/costela/wesher/cluster"
"github.com/costela/wesher/common"
"github.com/costela/wesher/etchosts"
"github.com/costela/wesher/wg"
"github.com/sirupsen/logrus"
)
var version = "dev"
func main() {
// General initialization
config, err := loadConfig()
if err != nil {
logrus.Fatal(err)
}
if config.Version {
fmt.Println(version)
os.Exit(0)
}
logLevel, err := logrus.ParseLevel(config.LogLevel)
if err != nil {
logrus.WithError(err).Fatal("could not parse loglevel")
}
logrus.SetLevel(logLevel)
// Create the wireguard and cluster configuration
wgstate, err := wg.New(config.Interface, config.WireguardPort)
if err != nil {
logrus.WithError(err).Fatal("could not instantiate wireguard controller")
}
cluster, err := cluster.New(config.Init, config.ClusterKey, config.BindAddr, config.ClusterPort, config.UseIPAsName)
if err != nil {
logrus.WithError(err).Fatal("could not create cluster")
}
// Prepare the /etc/hosts writer
hostsFile := &etchosts.EtcHosts{
Logger: logrus.StandardLogger(),
}
// Assign a local node address and propagate it to the cluster
wgstate.AssignOverlayAddr((*net.IPNet)(config.OverlayNet), cluster.LocalName)
localNode := common.Node{}
localNode.OverlayAddr = wgstate.OverlayAddr
localNode.PubKey = wgstate.PubKey.String()
cluster.Update(localNode)
// Join the cluster
nodec := 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.WithError(err).Errorf("could not join cluster, retrying in %s", dur)
},
); err != nil {
logrus.WithError(err).Fatal("could not join cluster")
}
// Main loop
incomingSigs := make(chan os.Signal, 1)
signal.Notify(incomingSigs, syscall.SIGTERM, os.Interrupt)
logrus.Debug("waiting for cluster events")
for {
select {
case rawNodes := <-nodec:
nodes := make([]common.Node, 0, len(rawNodes))
hosts := make(map[string][]string, len(rawNodes))
logrus.Info("cluster members:\n")
for _, node := range rawNodes {
if err := node.Decode(); err != nil {
logrus.Warnf("\t addr: %s, could not decode metadata", node.Addr)
continue
}
logrus.Infof("\taddr: %s, overlay: %s, pubkey: %s", node.Addr, node.OverlayAddr, node.PubKey)
nodes = append(nodes, node)
hosts[node.OverlayAddr.IP.String()] = []string{node.Name}
}
if err := wgstate.SetUpInterface(nodes); err != nil {
logrus.WithError(err).Error("could not up interface")
wgstate.DownInterface()
}
if !config.NoEtcHosts {
if err := hostsFile.WriteEntries(hosts); err != nil {
logrus.WithError(err).Error("could not write hosts entries")
}
}
case <-incomingSigs:
logrus.Info("terminating...")
cluster.Leave()
if !config.NoEtcHosts {
if err := hostsFile.WriteEntries(map[string][]string{}); err != nil {
logrus.WithError(err).Error("could not remove stale hosts entries")
}
}
if err := wgstate.DownInterface(); err != nil {
logrus.WithError(err).Error("could not down interface")
}
os.Exit(0)
}
}
}