Method replay

packages/computerd/src/exec/log.ts:174–193

(after: number | "tail" = 0)

  // empty iterator; live tail follow happens on the live stream,
  // not on the log.
  *replay(after: number | "tail" = 0): IterableIterator<ExecEvent> {
    const meta = this.meta();
    if (meta === undefined) {
      throw new ExecError("ENOENT", `no exec record for id ${this.id}`);
    }
    if (meta.evicted === 1) {
      throw new ExecError("ELOG_TRUNCATED", `log for exec ${this.id} has been evicted`);
    }
    if (after === "tail") return;
    const rows = this.db.all<EventRow>(
      `SELECT seq, kind, value FROM computerd_exec_log
			   WHERE exec_id = ? AND seq > ?
			 ORDER BY seq`,
      this.id,
      after,
    );
    for (const row of rows) {
      yield materialise(this.id, row);
    }
  }

  private meta(): MetaRow | undefined {
    return this.db.one<MetaRow>(`SELECT * FROM computerd_exec_meta WHERE exec_id = ?`, this.id);