package main import ( "regexp" "time" log "github.com/Sirupsen/logrus" "github.com/codegangsta/cli" "github.com/docker/swarm/discovery" ) func join(c *cli.Context) { if c.String("discovery") == "" { log.Fatal("--discovery required to join a cluster") } d, err := discovery.New(c.String("discovery"), c.Int("heartbeat")) if err != nil { log.Fatal(err) } addr := c.String("addr") if m, _ := regexp.MatchString("^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}:[0-9]{1,5}$", addr); !m { log.Fatal("--addr should be of the form ip:port") } if err := d.Register(addr); err != nil { log.Fatal(err) } hb := time.Duration(c.Int("heartbeat")) for { time.Sleep(hb * time.Second) if err := d.Register(c.String("addr")); err != nil { log.Error(err) } } }