60 lines
1.7 KiB
Go
60 lines
1.7 KiB
Go
package mmm
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import (
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"fmt"
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"iter"
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"runtime"
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"fiatjaf.com/nostr"
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"fiatjaf.com/nostr/eventstore/internal"
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"github.com/PowerDNS/lmdb-go/lmdb"
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)
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func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) error {
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il.mmmm.writeMutex.Lock()
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defer il.mmmm.writeMutex.Unlock()
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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filter := nostr.Filter{Limit: 1, 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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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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var yield_ func(nostr.Event) bool
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var results iter.Seq[nostr.Event] = func(yield func(nostr.Event) bool) {
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yield_ = yield
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}
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err := il.query(iltxn, filter, 10 /* in theory limit could be just 1 and this should work */, yield_)
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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 results {
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if internal.IsOlder(previous, evt) {
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if err := il.delete(mmmtxn, iltxn, previous.ID); err != nil {
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return fmt.Errorf("failed to delete event %s for replacing: %w", previous.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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