// extendMaster attempts to extend ownership of a master lock for TTL seconds.
// returns "", nil if extension failed
// returns id, nil if extension succeeded
// returns "", err if an error occurred
func (e *etcdMasterElector) extendMaster(path, id string, ttl uint64, res *etcd.Response) (string, error) {
// If it matches the passed in id, extend the lease by writing a new entry.
// Uses compare and swap, so that if we TTL out in the meantime, the write will fail.
// We don't handle the TTL delete w/o a write case here, it's handled in the next loop
// iteration.
_, err := e.etcd.CompareAndSwap(path, id, ttl, "", res.Node.ModifiedIndex)
if err != nil && !tools.IsEtcdTestFailed(err) {
return "", err
}
if err != nil && tools.IsEtcdTestFailed(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 tools.IsEtcdTestFailed(err), tools.IsEtcdNodeExist(err):
return errors.NewConflict(kind, name, err)
default:
return err
}
}
// errToAPIStatus converts an error to an api.Status object.
func errToAPIStatus(err error) *api.Status {
switch t := err.(type) {
case statusError:
status := t.Status()
if len(status.Status) == 0 {
status.Status = api.StatusFailure
}
if status.Code == 0 {
switch status.Status {
case api.StatusSuccess:
status.Code = http.StatusOK
case api.StatusFailure:
status.Code = http.StatusInternalServerError
}
}
//TODO: check for invalid responses
return &status
default:
status := http.StatusInternalServerError
switch {
//TODO: replace me with NewConflictErr
case tools.IsEtcdTestFailed(err):
status = http.StatusConflict
}
// Log errors that were not converted to an error status
// by REST storage - these typically indicate programmer
// error by not using pkg/api/errors, or unexpected failure
// cases.
util.HandleError(fmt.Errorf("apiserver received an error that is not an api.Status: %v", err))
return &api.Status{
Status: api.StatusFailure,
Code: status,
Reason: api.StatusReasonUnknown,
Message: err.Error(),
}
}
}