// becomeMaster attempts to become the master for this lock.
// returns "", nil if the attempt failed
// returns id, nil if the attempt succeeded
// returns "", err if an error occurred
func (e *etcdMasterElector) becomeMaster(path, id string, ttl uint64) (string, error) {
_, err := e.etcd.Create(path, id, ttl)
if err != nil && !etcdstorage.IsEtcdNodeExist(err) {
// unexpected error
return "", err
}
if err != nil && etcdstorage.IsEtcdNodeExist(err) {
return "", nil
}
return id, nil
}
// InterpretUpdateError converts a generic etcd error on a update
// operation into the appropriate API error.
func InterpretUpdateError(err error, kind, name string) error {
switch {
case etcdstorage.IsEtcdTestFailed(err), etcdstorage.IsEtcdNodeExist(err):
return errors.NewConflict(kind, name, err)
default:
return err
}
}
// InterpretCreateError converts a generic etcd error on a create
// operation into the appropriate API error.
func InterpretCreateError(err error, kind, name string) error {
switch {
case etcdstorage.IsEtcdNodeExist(err):
return errors.NewAlreadyExists(kind, name)
default:
return err
}
}