58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
package bolt
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import (
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"bytes"
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"context"
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"encoding/binary"
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"log"
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"github.com/boltdb/bolt"
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"github.com/nbd-wtf/go-nostr"
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nostr_binary "github.com/nbd-wtf/go-nostr/binary"
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)
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func (b *BoltBackend) CountEvents(ctx context.Context, filter nostr.Filter) (int64, error) {
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var count int64 = 0
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queries, extraFilter, since, err := prepareQueries(filter)
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if err != nil {
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return 0, err
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}
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err = b.db.View(func(txn *bolt.Tx) error {
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// actually iterate
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for _, q := range queries {
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bucket := txn.Bucket(q.bucket)
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raw := txn.Bucket(bucketRaw)
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c := bucket.Cursor()
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for k, v := c.Seek(q.startingPoint); k != nil && bytes.HasPrefix(k, q.prefix); k, v = c.Prev() {
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// "id" indexes don't contain a timestamp
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if !q.skipTimestamp {
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createdAt := binary.BigEndian.Uint32(k[len(k)-4:])
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if createdAt < since {
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break
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}
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}
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// fetch actual event
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val := raw.Get(v)
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evt := &nostr.Event{}
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if err := nostr_binary.Unmarshal(val, evt); err != nil {
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log.Printf("bolt: value read error (id %x): %s\n", val[0:32], err)
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break
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}
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// check if this matches the other filters that were not part of the index before yielding
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if extraFilter == nil || extraFilter.Matches(evt) {
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count++
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}
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}
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}
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return nil
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})
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return count, err
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}
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