well-goknown/vendor/github.com/fiatjaf/eventstore/postgresql/save.go

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package postgresql
import (
"context"
"encoding/json"
"github.com/fiatjaf/eventstore"
"github.com/nbd-wtf/go-nostr"
)
func (b *PostgresBackend) SaveEvent(ctx context.Context, evt *nostr.Event) error {
sql, params, _ := saveEventSql(evt)
res, err := b.DB.ExecContext(ctx, sql, params...)
if err != nil {
return err
}
nr, err := res.RowsAffected()
if err != nil {
return err
}
if nr == 0 {
return eventstore.ErrDupEvent
}
return nil
}
func (b *PostgresBackend) BeforeSave(ctx context.Context, evt *nostr.Event) {
// do nothing
}
func (b *PostgresBackend) AfterSave(evt *nostr.Event) {
if b.KeepRecentEvents {
return
}
// 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, id OFFSET 100 LIMIT 1
)`, evt.PubKey, evt.Kind)
}
func saveEventSql(evt *nostr.Event) (string, []any, error) {
const query = `INSERT INTO event (
id, pubkey, created_at, kind, tags, content, sig)
VALUES ($1, $2, $3, $4, $5, $6, $7)
ON CONFLICT (id) DO NOTHING`
var (
tagsj, _ = json.Marshal(evt.Tags)
params = []any{evt.ID, evt.PubKey, evt.CreatedAt, evt.Kind, tagsj, evt.Content, evt.Sig}
)
return query, params, nil
}