Changeset 0.26.0 (#165)

server/store/postgres/sessions.go

@@ -3,6 +3,7 @@ package postgres
 import (
 	"context"
 	"database/sql"
+	"time"
 
 	"git.gobha.me/xcaliber/chat-switchboard/models"
 )
@@ -87,6 +88,21 @@ func (s *SessionStore) Delete(ctx context.Context, id string) error {
 	return nil
 }
 
+// DeleteExpired removes sessions created before olderThan whose channel
+// has no messages. Returns the count of deleted rows.
+func (s *SessionStore) DeleteExpired(ctx context.Context, olderThan time.Time) (int64, error) {
+	res, err := DB.ExecContext(ctx, `
+		DELETE FROM session_participants sp
+		WHERE sp.created_at < $1
+		AND NOT EXISTS (
+			SELECT 1 FROM messages m WHERE m.channel_id = sp.channel_id
+		)`, olderThan)
+	if err != nil {
+		return 0, err
+	}
+	return res.RowsAffected()
+}
+
 // nullText returns nil for empty strings.
 func nullText(s string) interface{} {
 	if s == "" {