func (db *ETCDDB) UpdateDesiredLRP(logger lager.Logger, processGuid string, update *models.DesiredLRPUpdate) (*models.DesiredLRP, error) {
logger.Info("starting")
defer logger.Info("complete")
var schedulingInfo *models.DesiredLRPSchedulingInfo
var err error
var beforeDesiredLRP *models.DesiredLRP
for i := 0; i < 2; i++ {
var index uint64
beforeDesiredLRP, index, err = db.rawDesiredLRPByProcessGuid(logger, processGuid)
if err != nil {
logger.Error("failed-to-fetch-desired-lrp", err)
break
}
schedulingInfoValue := beforeDesiredLRP.DesiredLRPSchedulingInfo()
schedulingInfo = &schedulingInfoValue
schedulingInfo.ApplyUpdate(update)
err = db.updateDesiredLRPSchedulingInfo(logger, schedulingInfo, index)
if err != nil {
logger.Error("update-scheduling-info-failed", err)
modelErr := models.ConvertError(err)
if modelErr != models.ErrResourceConflict {
break
}
// Retry on CAS fail
continue
}
break
}
if err != nil {
return nil, err
}
return beforeDesiredLRP, nil
}
