func Before(c *cli.Context) error {
var (
heartbeat time.Duration
ttl time.Duration
)
if adver := c.String("advertise"); adver == "" {
return ErrRequireAdvertise
} else {
disc.Advertise = adver
}
if hbStr := c.String("heartbeat"); hbStr == "" {
heartbeat = disc.DefaultHeartbeat
} else {
if hb, err := time.ParseDuration(hbStr); err != nil {
log.Warning(err)
heartbeat = disc.DefaultHeartbeat
} else {
heartbeat = hb
}
}
if ttlStr := c.String("ttl"); ttlStr == "" {
ttl = disc.DefaultTTL
} else {
if t, err := time.ParseDuration(ttlStr); err != nil {
log.Warning(err)
ttl = disc.DefaultTTL
} else {
ttl = t
}
}
if disc.Discovery == "" {
if pos := c.Args(); len(pos) != 1 {
return ErrRequireDiscovery
} else {
disc.Discovery = pos[0]
}
}
// register monitor instance
disc.Register(heartbeat, ttl)
log.WithFields(log.Fields{"advertise": disc.Advertise, "discovery": disc.Discovery, "heartbeat": heartbeat, "ttl": ttl}).Info("begin advertise")
return nil
}
func Follow(w http.ResponseWriter, r *http.Request) {
if err := common("PUT", r); err != nil {
http.Error(w, err.Error(), 400)
return
}
var (
discovery = r.Form.Get("discovery")
cluster = r.Form.Get("cluster")
proxycfg = r.Form.Get("key")
heartbeat time.Duration
ttl time.Duration
)
if proxycfg == "" {
http.Error(w, "Bad Request", 400)
return
} else {
proxy.ProxyConfigKey = proxycfg
}
if hbStr := r.Form.Get("hb"); hbStr == "" {
heartbeat = disc.DefaultHeartbeat
} else {
if hb, err := time.ParseDuration(hbStr); err != nil {
heartbeat = disc.DefaultHeartbeat
} else {
heartbeat = hb
}
}
if ttlStr := r.Form.Get("ttl"); ttlStr == "" {
ttl = disc.DefaultTTL
} else {
if t, err := time.ParseDuration(ttlStr); err != nil {
ttl = disc.DefaultTTL
} else {
ttl = t
}
}
if proxy.ConfigReset != nil {
proxy.ConfigReset() // abort config
}
if disc.Cancel != nil {
disc.Cancel() // abort previous session
}
// resume advertising node, if we were advertising
if discovery != "null" && discovery != "" {
disc.Discovery = discovery
}
if cluster != "null" && cluster != "" {
disc.RegisterPath = path.Join(cluster, proxy.DiscoveryPath)
}
if disc.Discovery != "" {
disc.Register(heartbeat, ttl)
proxy.Follow()
}
w.Write([]byte("done"))
}