// RestoreError makes a best effort at converting the given error
// back into an error originally converted by ServerError(). If the
// error could not be converted then false is returned.
func RestoreError(err error) (error, bool) {
err = errors.Cause(err)
if apiErr, ok := err.(*params.Error); !ok {
return err, false
} else if apiErr == nil {
return nil, true
}
if params.ErrCode(err) == "" {
return err, false
}
msg := err.Error()
if singleton, ok := singletonError(err); ok {
return singleton, true
}
// TODO(ericsnow) Support the other error types handled by ServerError().
switch {
case params.IsCodeUnauthorized(err):
return errors.NewUnauthorized(nil, msg), true
case params.IsCodeNotFound(err):
// TODO(ericsnow) UnknownModelError should be handled here too.
// ...by parsing msg?
return errors.NewNotFound(nil, msg), true
case params.IsCodeAlreadyExists(err):
return errors.NewAlreadyExists(nil, msg), true
case params.IsCodeNotAssigned(err):
return errors.NewNotAssigned(nil, msg), true
case params.IsCodeHasAssignedUnits(err):
// TODO(ericsnow) Handle state.HasAssignedUnitsError here.
// ...by parsing msg?
return err, false
case params.IsCodeNoAddressSet(err):
// TODO(ericsnow) Handle isNoAddressSetError here.
// ...by parsing msg?
return err, false
case params.IsCodeNotProvisioned(err):
return errors.NewNotProvisioned(nil, msg), true
case params.IsCodeUpgradeInProgress(err):
// TODO(ericsnow) Handle state.UpgradeInProgressError here.
// ...by parsing msg?
return err, false
case params.IsCodeMachineHasAttachedStorage(err):
// TODO(ericsnow) Handle state.HasAttachmentsError here.
// ...by parsing msg?
return err, false
case params.IsCodeNotSupported(err):
return errors.NewNotSupported(nil, msg), true
case params.IsBadRequest(err):
return errors.NewBadRequest(nil, msg), true
case params.IsMethodNotAllowed(err):
return errors.NewMethodNotAllowed(nil, msg), true
case params.ErrCode(err) == params.CodeDischargeRequired:
// TODO(ericsnow) Handle DischargeRequiredError here.
return err, false
default:
return err, false
}
}
// unitsChanged responds to changes to the assigned units.
func (fw *Firewaller) unitsChanged(change *unitsChange) error {
changed := []*unitData{}
for _, name := range change.units {
unitTag := names.NewUnitTag(name)
unit, err := fw.st.Unit(unitTag)
if err != nil && !params.IsCodeNotFound(err) {
return err
}
var machineTag names.MachineTag
if unit != nil {
machineTag, err = unit.AssignedMachine()
if params.IsCodeNotFound(err) {
continue
} else if err != nil && !params.IsCodeNotAssigned(err) {
return err
}
}
if unitd, known := fw.unitds[unitTag]; known {
knownMachineTag := fw.unitds[unitTag].machined.tag
if unit == nil || unit.Life() == params.Dead || machineTag != knownMachineTag {
fw.forgetUnit(unitd)
changed = append(changed, unitd)
logger.Debugf("stopped watching unit %s", name)
}
// TODO(dfc) fw.machineds should be map[names.Tag]
} else if unit != nil && unit.Life() != params.Dead && fw.machineds[machineTag] != nil {
err = fw.startUnit(unit, machineTag)
if err != nil {
return err
}
changed = append(changed, fw.unitds[unitTag])
logger.Debugf("started watching %q", unitTag)
}
}
if err := fw.flushUnits(changed); err != nil {
return errors.Annotate(err, "cannot change firewall ports")
}
return nil
}