63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
package database
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import (
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"bytes"
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"context"
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"time"
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"database.orly/indexes"
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"database.orly/indexes/types"
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"encoders.orly/event"
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"github.com/dgraph-io/badger/v4"
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"lol.mleku.dev/chk"
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)
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func (d *D) DeleteExpired() {
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var err error
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var expiredSerials types.Uint40s
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// make the operation atomic and save on accesses to the system clock by
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// setting the boundary at the current second
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now := time.Now().Unix()
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// search the expiration indexes for expiry timestamps that are now past
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if err = d.View(
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func(txn *badger.Txn) (err error) {
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exp, ser := indexes.ExpirationVars()
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expPrf := new(bytes.Buffer)
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if _, err = indexes.ExpirationPrefix.Write(expPrf); chk.E(err) {
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return
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}
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it := txn.NewIterator(badger.IteratorOptions{Prefix: expPrf.Bytes()})
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defer it.Close()
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for it.Rewind(); it.Valid(); it.Next() {
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item := it.Item()
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key := item.Key()
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buf := bytes.NewBuffer(key)
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if err = indexes.ExpirationDec(
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exp, ser,
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).UnmarshalRead(buf); chk.E(err) {
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continue
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}
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if int64(exp.Get()) > now {
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// not expired yet
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continue
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}
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expiredSerials = append(expiredSerials, ser)
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}
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return
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},
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); chk.E(err) {
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}
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// delete the events and their indexes
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for _, ser := range expiredSerials {
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var ev *event.E
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if ev, err = d.FetchEventBySerial(ser); chk.E(err) {
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continue
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}
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if err = d.DeleteEventBySerial(
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context.Background(), ser, ev,
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); chk.E(err) {
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continue
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}
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}
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}
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