如何在 ruby​​ 中解码 Amazon QLDB 的 ion_binary

Question

我正在用 ruby​​ 玩亚马逊的QLDB ，并使用了aws-sdk-qldb和aws-sdk-qldbsession gem。 我得到的结果是 IonBinary。 但无法解码和解析它。

以下是代码

      cred = Aws::Credentials.new(ENV['AWS_ACCESS_KEY'], ENV['AWS_SECRET_ACCESS_KEY'])

      qldb_session_client = Aws::QLDBSession::Client.new(region: 'ap-southeast-1', credentials: cred)

      start_session_req = Aws::QLDBSession::Types::StartSessionRequest.new
      start_session_req.ledger_name = 'ledger-test'


      command_request = Aws::QLDBSession::Types::SendCommandRequest.new

      command_request.start_session = start_session_req

      resp = qldb_session_client.send_command(command_request)
      session_token = resp.start_session.session_token

      command_request = Aws::QLDBSession::Types::SendCommandRequest.new
      command_request.session_token = session_token
      command_request.start_transaction = Aws::QLDBSession::Types::StartTransactionRequest.new
      resp = qldb_session_client.send_command(command_request)
      transaction_id = resp.start_transaction.transaction_id

      command_request = Aws::QLDBSession::Types::SendCommandRequest.new
      command_request.session_token = session_token
      command_request.execute_statement = Aws::QLDBSession::Types::ExecuteStatementRequest.new
      command_request.execute_statement.transaction_id = transaction_id
      command_request.execute_statement.statement = 'select * from testing'

      resp = qldb_session_client.send_command(command_request)

现在如果我使用以下代码

resp.execute_statement.first_page.values[0]

我得到

{:ion_binary=>"\xE0\x01\x00\xEA\xEE\x9A\x81\x83\xDE\x96\x87\xBE\x93\x89firstname\x88lastname\xDE\x9D\x8A\x8Dtesting first\x8B\x8Ctesting last", :ion_text=>"[FILTERED]"}

我无法使用二进制解析器解码这个 ion_binary。

Answer 1

解码流很可能是使用Aws::EventStream::Decoder#decode 。 也就是说，有点像下面应该工作。

Aws::EventStream::Decoder.new.decode(
  StringIO.new(result[:ion_binary])
)