55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
package mmm
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import (
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"context"
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"fmt"
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"math"
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"github.com/PowerDNS/lmdb-go/lmdb"
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"github.com/fiatjaf/eventstore/internal"
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"github.com/nbd-wtf/go-nostr"
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)
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func (il *IndexingLayer) ReplaceEvent(ctx context.Context, evt *nostr.Event) error {
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// sanity checking
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if evt.CreatedAt > math.MaxUint32 || evt.Kind > math.MaxUint16 {
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return fmt.Errorf("event with values out of expected boundaries")
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}
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filter := nostr.Filter{Limit: 1, Kinds: []int{evt.Kind}, Authors: []string{evt.PubKey}}
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if nostr.IsAddressableKind(evt.Kind) {
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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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return il.mmmm.lmdbEnv.Update(func(mmmtxn *lmdb.Txn) error {
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mmmtxn.RawRead = true
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return il.lmdbEnv.Update(func(iltxn *lmdb.Txn) error {
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// now we fetch the past events, whatever they are, delete them and then save the new
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prevResults, err := il.query(iltxn, filter, 10) // in theory limit could be just 1 and this should work
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if err != nil {
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return fmt.Errorf("failed to query past events with %s: %w", filter, err)
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}
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shouldStore := true
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for _, previous := range prevResults {
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if internal.IsOlder(previous.Event, evt) {
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if err := il.delete(mmmtxn, iltxn, previous.Event); err != nil {
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return fmt.Errorf("failed to delete event %s for replacing: %w", previous.Event.ID, err)
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}
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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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_, err := il.mmmm.storeOn(mmmtxn, []*IndexingLayer{il}, []*lmdb.Txn{iltxn}, evt)
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return err
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}
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return nil
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})
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})
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}
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