func replaceConfig(e *etcdm.EtcdManager, nc *cluster.NilConfig) error {
lsi, _, err := e.GetLeaderSentinelInfo()
if lsi == nil {
return fmt.Errorf("leader sentinel info not available")
}
ncj, err := json.Marshal(nc)
if err != nil {
return fmt.Errorf("failed to marshall config: %v", err)
}
req, err := http.NewRequest("PUT", fmt.Sprintf("http://%s:%s/config/current", lsi.ListenAddress, lsi.Port), bytes.NewReader(ncj))
if err != nil {
return fmt.Errorf("cannot create request: %v", err)
}
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
res, err := client.Do(req)
if err != nil {
return fmt.Errorf("error setting config: %v", err)
}
if res.StatusCode != http.StatusOK {
return fmt.Errorf("error setting config: leader sentinel returned non ok code: %s", res.Status)
}
return nil
}
func getConfig(e *etcdm.EtcdManager) (*cluster.NilConfig, error) {
cv, _, err := e.GetClusterView()
if err != nil {
return nil, fmt.Errorf("cannot get clusterview: %v", err)
}
if cv == nil {
return nil, fmt.Errorf("no clusterview available")
}
cfg := cv.Config
if cfg == nil {
return nil, nil
}
return cfg, nil
}
func WaitClusterViewMaster(master string, e *etcdm.EtcdManager, timeout time.Duration) error {
start := time.Now()
for time.Now().Add(-timeout).Before(start) {
cv, _, err := e.GetClusterView()
if err != nil {
goto end
}
if cv != nil {
if cv.Master == master {
return nil
}
}
end:
time.Sleep(2 * time.Second)
}
return fmt.Errorf("timeout")
}