// 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
}
// errToAPIStatus converts an error to an api.Status object.
func errToAPIStatus(err error) *api.Status {
switch t := err.(type) {
case statusError:
status := t.Status()
status.Status = api.StatusFailure
//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.
glog.V(1).Infof("An unchecked error was received: %v", err)
return &api.Status{
Status: api.StatusFailure,
Code: status,
Reason: api.StatusReasonUnknown,
Message: err.Error(),
}
}
}
// MakeAsync takes a function and executes it, delivering the result in the way required
// by RESTStorage's Update, Delete, and Create methods.
func MakeAsync(fn WorkFunc) <-chan interface{} {
channel := make(chan interface{})
go func() {
defer util.HandleCrash()
obj, err := fn()
if err != nil {
status := http.StatusInternalServerError
switch {
case tools.IsEtcdTestFailed(err):
status = http.StatusConflict
}
channel <- &api.Status{
Status: api.StatusFailure,
Message: err.Error(),
Code: status,
}
} else {
channel <- obj
}
// 'close' is used to signal that no further values will
// be written to the channel. Not strictly necessary, but
// also won't hurt.
close(channel)
}()
return channel
}
// 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 {
}
switch status.Status {
case api.StatusSuccess:
if status.Code == 0 {
status.Code = http.StatusOK
}
case "":
status.Status = api.StatusFailure
fallthrough
case api.StatusFailure:
if status.Code == 0 {
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(),
}
}
}
// errToAPIStatus converts an error to an api.Status object.
func errToAPIStatus(err error) *api.Status {
switch t := err.(type) {
case *apiServerError:
status := t.Status
status.Status = api.StatusFailure
//TODO: check for invalid responses
return &status
default:
status := http.StatusInternalServerError
switch {
//TODO: replace me with NewUpdateConflictErr
case tools.IsEtcdTestFailed(err):
status = http.StatusConflict
}
return &api.Status{
Status: api.StatusFailure,
Code: status,
Reason: api.ReasonTypeUnknown,
Message: err.Error(),
}
}
}