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evacuation_db.go
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/
evacuation_db.go
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package sqldb
import (
"context"
"reflect"
"code.cloudfoundry.org/bbs/db/sqldb/helpers"
"code.cloudfoundry.org/bbs/models"
"code.cloudfoundry.org/lager"
)
func (db *SQLDB) EvacuateActualLRP(
ctx context.Context,
logger lager.Logger,
lrpKey *models.ActualLRPKey,
instanceKey *models.ActualLRPInstanceKey,
netInfo *models.ActualLRPNetInfo,
internalRoutes []*models.ActualLRPInternalRoute,
) (*models.ActualLRP, error) {
logger = logger.Session("db-evacuate-actual-lrp", lager.Data{"lrp_key": lrpKey, "instance_key": instanceKey, "net_info": netInfo})
logger.Debug("starting")
defer logger.Debug("complete")
var actualLRP *models.ActualLRP
err := db.transact(ctx, logger, func(logger lager.Logger, tx helpers.Tx) error {
var err error
processGuid := lrpKey.ProcessGuid
index := lrpKey.Index
actualLRP, err = db.fetchActualLRPForUpdate(ctx, logger, processGuid, index, models.ActualLRP_Evacuating, tx)
if err == models.ErrResourceNotFound {
logger.Debug("creating-evacuating-lrp")
actualLRP, err = db.createEvacuatingActualLRP(ctx, logger, lrpKey, instanceKey, netInfo, internalRoutes, tx)
return err
}
if err != nil {
logger.Error("failed-locking-lrp", err)
return err
}
if actualLRP.ActualLRPKey.Equal(lrpKey) &&
actualLRP.ActualLRPInstanceKey.Equal(instanceKey) &&
reflect.DeepEqual(actualLRP.ActualLRPNetInfo, *netInfo) {
logger.Debug("evacuating-lrp-already-exists")
return models.ErrResourceExists
}
now := db.clock.Now().UnixNano()
actualLRP.ModificationTag.Increment()
actualLRP.ActualLRPKey = *lrpKey
actualLRP.ActualLRPInstanceKey = *instanceKey
actualLRP.Since = now
actualLRP.ActualLRPNetInfo = *netInfo
actualLRP.ActualLrpInternalRoutes = internalRoutes
actualLRP.Presence = models.ActualLRP_Evacuating
netInfoData, err := db.serializeModel(logger, netInfo)
if err != nil {
logger.Error("failed-serializing-net-info", err)
return err
}
internalRoutesData, err := db.encodeInternalRouteData(logger, internalRoutes)
if err != nil {
logger.Error("failed-to-serialize-internalroutes", err)
return err
}
_, err = db.update(ctx, logger, tx, "actual_lrps",
helpers.SQLAttributes{
"domain": actualLRP.Domain,
"instance_guid": actualLRP.InstanceGuid,
"cell_id": actualLRP.CellId,
"net_info": netInfoData,
"internal_routes": internalRoutesData,
"state": actualLRP.State,
"since": actualLRP.Since,
"modification_tag_index": actualLRP.ModificationTag.Index,
},
"process_guid = ? AND instance_index = ? AND presence = ?",
actualLRP.ProcessGuid, actualLRP.Index, models.ActualLRP_Evacuating,
)
if err != nil {
logger.Error("failed-update-evacuating-lrp", err)
return err
}
return nil
})
return actualLRP, err
}
func (db *SQLDB) RemoveEvacuatingActualLRP(ctx context.Context, logger lager.Logger, lrpKey *models.ActualLRPKey, instanceKey *models.ActualLRPInstanceKey) error {
logger = logger.Session("db-remove-evacuating-actual-lrp", lager.Data{"lrp_key": lrpKey, "instance_key": instanceKey})
logger.Debug("starting")
defer logger.Debug("complete")
return db.transact(ctx, logger, func(logger lager.Logger, tx helpers.Tx) error {
processGuid := lrpKey.ProcessGuid
index := lrpKey.Index
lrp, err := db.fetchActualLRPForUpdate(ctx, logger, processGuid, index, models.ActualLRP_Evacuating, tx)
if err == models.ErrResourceNotFound {
logger.Debug("evacuating-lrp-does-not-exist")
return nil
}
if err != nil {
logger.Error("failed-fetching-actual-lrp", err)
return err
}
if !lrp.ActualLRPInstanceKey.Equal(instanceKey) {
logger.Debug("actual-lrp-instance-key-mismatch", lager.Data{"instance_key_param": instanceKey, "instance_key_from_db": lrp.ActualLRPInstanceKey})
return models.ErrActualLRPCannotBeRemoved
}
_, err = db.delete(ctx, logger, tx, "actual_lrps",
"process_guid = ? AND instance_index = ? AND presence = ?",
processGuid, index, models.ActualLRP_Evacuating,
)
if err != nil {
logger.Error("failed-delete", err)
return models.ErrActualLRPCannotBeRemoved
}
return nil
})
}
func (db *SQLDB) createEvacuatingActualLRP(
ctx context.Context,
logger lager.Logger,
lrpKey *models.ActualLRPKey,
instanceKey *models.ActualLRPInstanceKey,
netInfo *models.ActualLRPNetInfo,
internalRoutes []*models.ActualLRPInternalRoute,
tx helpers.Tx,
) (*models.ActualLRP, error) {
netInfoData, err := db.serializeModel(logger, netInfo)
if err != nil {
logger.Error("failed-serializing-net-info", err)
return nil, err
}
internalRoutesData, err := db.encodeInternalRouteData(logger, internalRoutes)
if err != nil {
logger.Error("failed-to-serialize-internalroutes", err)
return nil, err
}
now := db.clock.Now()
guid, err := db.guidProvider.NextGUID()
if err != nil {
return nil, models.ErrGUIDGeneration
}
actualLRP := &models.ActualLRP{
ActualLRPKey: *lrpKey,
ActualLRPInstanceKey: *instanceKey,
ActualLRPNetInfo: *netInfo,
ActualLrpInternalRoutes: internalRoutes,
State: models.ActualLRPStateRunning,
Since: now.UnixNano(),
ModificationTag: models.ModificationTag{Epoch: guid, Index: 0},
Presence: models.ActualLRP_Evacuating,
}
sqlAttributes := helpers.SQLAttributes{
"process_guid": actualLRP.ProcessGuid,
"instance_index": actualLRP.Index,
"presence": models.ActualLRP_Evacuating,
"domain": actualLRP.Domain,
"instance_guid": actualLRP.InstanceGuid,
"cell_id": actualLRP.CellId,
"state": actualLRP.State,
"net_info": netInfoData,
"internal_routes": internalRoutesData,
"since": actualLRP.Since,
"modification_tag_epoch": actualLRP.ModificationTag.Epoch,
"modification_tag_index": actualLRP.ModificationTag.Index,
}
_, err = db.upsert(ctx, logger, tx, "actual_lrps",
sqlAttributes,
"process_guid = ? AND instance_index = ? AND presence = ?",
actualLRP.ProcessGuid, actualLRP.Index, models.ActualLRP_Evacuating,
)
if err != nil {
logger.Error("failed-inserting-evacuating-lrp", err)
return nil, err
}
return actualLRP, nil
}