func (d *dataStoreData) canApplyTxn(obj memContextObj) bool {
// TODO(riannucci): implement with Flush/FlushRevert for persistance.
txn := obj.(*txnDataStoreData)
for rk, muts := range txn.muts {
if len(muts) == 0 { // read-only
continue
}
prop, err := serialize.ReadProperty(bytes.NewBufferString(rk), serialize.WithContext, "", "")
memoryCorruption(err)
k := prop.Value().(*ds.Key)
entKey := "ents:" + k.Namespace()
mkey := groupMetaKey(k)
entsHead := d.head.GetCollection(entKey)
entsSnap := txn.snap.GetCollection(entKey)
vHead := curVersion(entsHead, mkey)
vSnap := curVersion(entsSnap, mkey)
if vHead != vSnap {
return false
}
}
return true
}
func parseSuffix(aid, ns string, suffixFormat []ds.IndexColumn, suffix []byte, count int) (raw [][]byte, decoded []ds.Property) {
buf := serialize.Invertible(bytes.NewBuffer(suffix))
decoded = make([]ds.Property, len(suffixFormat))
raw = make([][]byte, len(suffixFormat))
err := error(nil)
for i := range decoded {
if count >= 0 && i >= count {
break
}
needInvert := suffixFormat[i].Descending
buf.SetInvert(needInvert)
decoded[i], err = serialize.ReadProperty(buf, serialize.WithoutContext, aid, ns)
memoryCorruption(err)
offset := len(suffix) - buf.Len()
raw[i] = suffix[:offset]
suffix = suffix[offset:]
if needInvert {
raw[i] = serialize.Invert(raw[i])
}
}
return
}
func addIndexes(store *memStore, aid, ns string, compIdx []*ds.IndexDefinition) {
normalized := make([]*ds.IndexDefinition, len(compIdx))
idxColl := store.SetCollection("idx", nil)
for i, idx := range compIdx {
normalized[i] = idx.Normalize()
idxColl.Set(serialize.ToBytes(*normalized[i].PrepForIdxTable()), []byte{})
}
if allEnts := store.GetCollection("ents:" + ns); allEnts != nil {
allEnts.VisitItemsAscend(nil, true, func(i *gkvlite.Item) bool {
pm, err := rpm(i.Val)
memoryCorruption(err)
prop, err := serialize.ReadProperty(bytes.NewBuffer(i.Key), serialize.WithoutContext, aid, ns)
memoryCorruption(err)
k := prop.Value().(*ds.Key)
sip := serialize.PropertyMapPartially(k, pm)
mergeIndexes(ns, store,
newMemStore(),
indexEntries(sip, ns, normalized))
return true
})
}
}