mirror of
https://github.com/aljazceru/khatru.git
synced 2026-01-13 02:14:20 +01:00
90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
package postgresql
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import (
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"context"
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"encoding/json"
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"github.com/fiatjaf/relayer/v2/storage"
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"github.com/nbd-wtf/go-nostr"
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)
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func (b *PostgresBackend) SaveEvent(ctx context.Context, evt *nostr.Event) error {
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deleteQuery, deleteParams, shouldDelete := deleteBeforeSaveSql(evt)
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if shouldDelete {
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_, _ = b.DB.ExecContext(ctx, deleteQuery, deleteParams...)
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}
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sql, params, _ := saveEventSql(evt)
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res, err := b.DB.ExecContext(ctx, sql, params...)
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if err != nil {
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return err
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}
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nr, err := res.RowsAffected()
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if err != nil {
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return err
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}
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if nr == 0 {
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return storage.ErrDupEvent
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}
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return nil
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}
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func (b *PostgresBackend) BeforeSave(ctx context.Context, evt *nostr.Event) {
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// do nothing
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}
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func (b *PostgresBackend) AfterSave(evt *nostr.Event) {
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// delete all but the 100 most recent ones for each key
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b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND created_at < (
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SELECT created_at FROM event WHERE pubkey = $1
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ORDER BY created_at DESC OFFSET 100 LIMIT 1
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)`, evt.PubKey, evt.Kind)
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}
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func deleteBeforeSaveSql(evt *nostr.Event) (string, []any, bool) {
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// react to different kinds of events
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var (
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query = ""
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params []any
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shouldDelete bool
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)
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if evt.Kind == nostr.KindSetMetadata || evt.Kind == nostr.KindContactList || (10000 <= evt.Kind && evt.Kind < 20000) {
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// delete past events from this user
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query = `DELETE FROM event WHERE pubkey = $1 AND kind = $2`
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params = []any{evt.PubKey, evt.Kind}
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shouldDelete = true
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} else if evt.Kind == nostr.KindRecommendServer {
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// delete past recommend_server events equal to this one
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query = `DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND content = $3`
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params = []any{evt.PubKey, evt.Kind, evt.Content}
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shouldDelete = true
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} else if evt.Kind >= 30000 && evt.Kind < 40000 {
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// NIP-33
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d := evt.Tags.GetFirst([]string{"d"})
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if d != nil {
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query = `DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND tagvalues && ARRAY[$3]`
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params = []any{evt.PubKey, evt.Kind, d.Value()}
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shouldDelete = true
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}
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}
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return query, params, shouldDelete
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}
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func saveEventSql(evt *nostr.Event) (string, []any, error) {
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const query = `INSERT INTO event (
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id, pubkey, created_at, kind, tags, content, sig)
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VALUES ($1, $2, $3, $4, $5, $6, $7)
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ON CONFLICT (id) DO NOTHING`
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var (
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tagsj, _ = json.Marshal(evt.Tags)
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params = []any{evt.ID, evt.PubKey, evt.CreatedAt, evt.Kind, tagsj, evt.Content, evt.Sig}
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)
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return query, params, nil
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}
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