fiatjaf
58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
package lmdb
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import (
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"fmt"
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"iter"
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"fiatjaf.com/nostr"
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"github.com/PowerDNS/lmdb-go/lmdb"
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)
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func (b *LMDBBackend) ReplaceEvent(evt nostr.Event) (deleted []nostr.Event, err error) {
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err = b.lmdbEnv.Update(func(txn *lmdb.Txn) error {
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// check if we already have this id
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_, existsErr := txn.Get(b.indexId, evt.ID[0:8])
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if existsErr == nil {
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return nil
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}
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if operr, ok := existsErr.(*lmdb.OpError); !ok || operr.Errno != lmdb.NotFound {
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return existsErr
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}
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filter := nostr.Filter{Kinds: []nostr.Kind{evt.Kind}, Authors: []nostr.PubKey{evt.PubKey}}
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if evt.Kind.IsAddressable() {
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// when addressable, add the "d" tag to the filter
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filter.Tags = nostr.TagMap{"d": []string{evt.Tags.GetD()}}
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}
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// now we fetch the past events, whatever they are, delete them and then save the new
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var qerr error
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var results iter.Seq[nostr.Event] = func(yield func(nostr.Event) bool) {
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qerr = b.query(txn, filter, 10 /* in theory limit could be just 1 and this should work */, yield)
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}
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if qerr != nil {
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return fmt.Errorf("failed to query past events with %s: %w", filter, qerr)
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}
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shouldStore := true
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for previous := range results {
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if nostr.IsOlder(previous, evt) {
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if qerr := b.delete(txn, previous.ID); qerr != nil {
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return fmt.Errorf("failed to delete event %s for replacing: %w", previous.ID, qerr)
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}
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deleted = append(deleted, previous)
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} else {
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// there is a newer event already stored, so we won't store this
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shouldStore = false
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}
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}
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if shouldStore {
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return b.save(txn, evt)
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}
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return nil
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})
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return deleted, err
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}
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