bring in khatru and eventstore.

eventstore/lmdb/save.go

@@ -0,0 +1,71 @@
+package lmdb
+
+import (
+	"context"
+	"encoding/hex"
+	"fmt"
+	"math"
+
+	"github.com/PowerDNS/lmdb-go/lmdb"
+	"github.com/fiatjaf/eventstore"
+	bin "github.com/fiatjaf/eventstore/internal/binary"
+	"github.com/nbd-wtf/go-nostr"
+)
+
+func (b *LMDBBackend) SaveEvent(ctx context.Context, evt *nostr.Event) error {
+	// sanity checking
+	if evt.CreatedAt > math.MaxUint32 || evt.Kind > math.MaxUint16 {
+		return fmt.Errorf("event with values out of expected boundaries")
+	}
+
+	return b.lmdbEnv.Update(func(txn *lmdb.Txn) error {
+		if b.EnableHLLCacheFor != nil {
+			// modify hyperloglog caches relative to this
+			useCache, skipSaving := b.EnableHLLCacheFor(evt.Kind)
+
+			if useCache {
+				err := b.updateHyperLogLogCachedValues(txn, evt)
+				if err != nil {
+					return fmt.Errorf("failed to update hll cache: %w", err)
+				}
+				if skipSaving {
+					return nil
+				}
+			}
+		}
+
+		// check if we already have this id
+		id, _ := hex.DecodeString(evt.ID)
+		_, err := txn.Get(b.indexId, id)
+		if operr, ok := err.(*lmdb.OpError); ok && operr.Errno != lmdb.NotFound {
+			// we will only proceed if we get a NotFound
+			return eventstore.ErrDupEvent
+		}
+
+		return b.save(txn, evt)
+	})
+}
+
+func (b *LMDBBackend) save(txn *lmdb.Txn, evt *nostr.Event) error {
+	// encode to binary form so we'll save it
+	bin, err := bin.Marshal(evt)
+	if err != nil {
+		return err
+	}
+
+	idx := b.Serial()
+	// raw event store
+	if err := txn.Put(b.rawEventStore, idx, bin, 0); err != nil {
+		return err
+	}
+
+	// put indexes
+	for k := range b.getIndexKeysForEvent(evt) {
+		err := txn.Put(k.dbi, k.key, idx, 0)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}