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update.go
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update.go
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package backend
import (
"github.com/Azure/azure-sdk-for-go/storage"
filterutils "github.com/khenidak/london/pkg/backend/filter"
"github.com/khenidak/london/pkg/backend/storerecord"
"github.com/khenidak/london/pkg/backend/utils"
"github.com/khenidak/london/pkg/types"
)
// Updates performs an update on existing (current) record by
// 1. updates current with rev, value, lease
// 2. create a new record that carries old value and revision (as row key)
func (s *store) Update(key string, val []byte, revision int64, lease int64) (types.Record, types.Record, error) {
// klogv2.Infof("STORE-UPDATE:%v-%v", key, revision)
validKey := storerecord.CreateValidKey(key)
// get new rev
newRev, err := s.rev.Increment()
if err != nil {
return nil, nil, err
}
// we operate only on the row entity here. Meaning:
// for old record we get only row entity
// for new record we insert row + data entities
// pkey == key && rKey == current && revision == revision
f := filterutils.NewFilter()
f.And(
filterutils.Partition(validKey),
filterutils.CurrentKeysOnly(),
filterutils.ExcludeEvents(),
)
o := &storage.QueryOptions{
Filter: f.Generate(),
}
entites, err := s.execQueryFull(storage.FullMetadata, o)
if err != nil {
return nil, nil, err
}
// no results
if len(entites) == 0 {
return nil, nil, storage.AzureStorageServiceError{StatusCode: 404}
}
currentRecord, err := storerecord.NewFromEntities(entites, true)
if err != nil {
return nil, nil, err
}
if currentRecord.ModRevision() != revision {
// record is not at current revision
getRecord, _, err := s.GetIfNeeded(currentRecord.RowEntity(), true)
if err != nil {
return nil, nil, err
}
// klogv2.Infof("update conflict:key:%v\nwant:%v\nstored:%v", key, revision, currentRecord.ModRevision())
return getRecord, nil, storage.AzureStorageServiceError{StatusCode: 409}
}
batch := s.t.NewBatch()
updatedRecord, err := storerecord.NewForUpdate(newRev, val, currentRecord, lease)
if err != nil {
return nil, nil, err
}
event := storerecord.CreateEventEntityFromRecord(updatedRecord)
mergeEntity := updatedRecord.RowEntity()
mergeEntity.Table = s.t
// merge updated row entity into
batch.MergeEntity(mergeEntity)
// add the data records for updated Entity
for _, e := range updatedRecord.DataEntities() {
e.Table = s.t
batch.InsertEntity(e)
}
// insert the row Entity for current (which should have been modified)
insertEntity := currentRecord.RowEntity()
insertEntity.Table = s.t
batch.InsertEntity(insertEntity)
// insert event
event.Table = s.t
batch.InsertEntity(event)
err = utils.SafeExecuteBatch(batch)
if err != nil {
return nil, nil, err
}
return currentRecord, updatedRecord, nil
}