package cli import ( "regexp" "time" log "github.com/Sirupsen/logrus" "github.com/codegangsta/cli" "github.com/docker/swarm/discovery" ) func checkAddrFormat(addr string) bool { m, _ := regexp.MatchString("^[0-9a-zA-Z._-]+:[0-9]{1,5}$", addr) return m } func join(c *cli.Context) { dflag := getDiscovery(c) if dflag == "" { log.Fatalf("discovery required to join a cluster. See '%s join --help'.", c.App.Name) } addr := c.String("advertise") if addr == "" { log.Fatal("missing mandatory --advertise flag") } if !checkAddrFormat(addr) { log.Fatal("--advertise should be of the form ip:port or hostname:port") } hb, err := time.ParseDuration(c.String("heartbeat")) if err != nil { log.Fatalf("invalid --heartbeat: %v", err) } if hb < 1*time.Second { log.Fatal("--heartbeat should be at least one second") } ttl, err := time.ParseDuration(c.String("ttl")) if err != nil { log.Fatalf("invalid --ttl: %v", err) } if ttl <= hb { log.Fatal("--ttl must be strictly superior to the heartbeat value") } d, err := discovery.New(dflag, hb, ttl, getDiscoveryOpt(c)) if err != nil { log.Fatal(err) } for { log.WithFields(log.Fields{"addr": addr, "discovery": dflag}).Infof("Registering on the discovery service every %s...", hb) if err := d.Register(addr); err != nil { log.Error(err) } time.Sleep(hb) } }