Function readSessionLite

src/utils/sessionStoragePortable.ts:256–282

(
  filePath: string,
)

 * Returns null on any error.
 */
export async function readSessionLite(
  filePath: string,
): Promise<LiteSessionFile | null> {
  try {
    const fh = await fsOpen(filePath, 'r')
    try {
      const stat = await fh.stat()
      const buf = Buffer.allocUnsafe(LITE_READ_BUF_SIZE)
      const headResult = await fh.read(buf, 0, LITE_READ_BUF_SIZE, 0)
      if (headResult.bytesRead === 0) return null

      const head = buf.toString('utf8', 0, headResult.bytesRead)
      const tailOffset = Math.max(0, stat.size - LITE_READ_BUF_SIZE)
      let tail = head
      if (tailOffset > 0) {
        const tailResult = await fh.read(buf, 0, LITE_READ_BUF_SIZE, tailOffset)
        tail = buf.toString('utf8', 0, tailResult.bytesRead)
      }

      return { mtime: stat.mtime.getTime(), size: stat.size, head, tail }
    } finally {
      await fh.close()
    }
  } catch {
    return null
  }
}

// ---------------------------------------------------------------------------
// Path sanitization