import from khatru.

sqlite3/save.go

@@ -0,0 +1,44 @@
+package sqlite3
+
+import (
+	"context"
+	"encoding/json"
+
+	"github.com/fiatjaf/khatru"
+	"github.com/nbd-wtf/go-nostr"
+)
+
+func (b *SQLite3Backend) SaveEvent(ctx context.Context, evt *nostr.Event) error {
+	// insert
+	tagsj, _ := json.Marshal(evt.Tags)
+	res, err := b.DB.ExecContext(ctx, `
+        INSERT INTO event (id, pubkey, created_at, kind, tags, content, sig)
+        VALUES ($1, $2, $3, $4, $5, $6, $7)
+    `, evt.ID, evt.PubKey, evt.CreatedAt, evt.Kind, tagsj, evt.Content, evt.Sig)
+	if err != nil {
+		return err
+	}
+
+	nr, err := res.RowsAffected()
+	if err != nil {
+		return err
+	}
+
+	if nr == 0 {
+		return khatru.ErrDupEvent
+	}
+
+	return nil
+}
+
+func (b *SQLite3Backend) BeforeSave(ctx context.Context, evt *nostr.Event) {
+	// do nothing
+}
+
+func (b *SQLite3Backend) AfterSave(evt *nostr.Event) {
+	// delete all but the 100 most recent ones for each key
+	b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND created_at < (
+      SELECT created_at FROM event WHERE pubkey = $1
+      ORDER BY created_at DESC OFFSET 100 LIMIT 1
+    )`, evt.PubKey, evt.Kind)
+}