Pascal (Lazarus/Delphi)

Glacier Download Archive

See more Amazon Glacier Examples

Demonstrates how to download an Amazon Glacier archive. Downloading a Glacier archive is a two step process. First an archive retrieval job is initiated. After it completes, the job output is downloaded (i.e. the archive contents are downloaded.)

Note: This example requires Chilkat v9.5.0.78 or greater.

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.AuthAws,
  Chilkat.Rest,
  Chilkat.Stream;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  port: Integer;
  bAutoReconnect: Boolean;
  authAws: TAuthAws;
  responseStatusCode: Integer;
  bodyStream: TStream;
  jsonError: string;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  rest := TRest.Create;

  //  Connect to the Amazon AWS REST server in the desired region.
  bTls := True;
  port := 443;
  bAutoReconnect := True;
  success := rest.Connect('glacier.us-west-2.amazonaws.com',port,bTls,bAutoReconnect);

  //  Provide AWS credentials.
  authAws := TAuthAws.Create;
  authAws.AccessKey := 'AWS_ACCESS_KEY';
  authAws.SecretKey := 'AWS_SECRET_KEY';
  authAws.ServiceName := 'glacier';
  authAws.Region := 'us-west-2';

  success := rest.SetAuthAws(authAws);

  //  --------------------------------------------------------------------------
  //  Note: The above REST connection and setup of the AWS credentials
  //  can be done once.  After connecting, any number of REST calls can be made.
  //  The "auto reconnect" property passed to rest.Connect indicates that if
  //  the connection is lost, a REST method call will automatically reconnect
  //  if needed.
  //  --------------------------------------------------------------------------

  //  For more information, see Glacier Retrieve Job Output Reference Documentation
  //  
  rest.AddHeader('x-amz-glacier-version','2012-06-01');

  //  To download an archive, we'll make several method calls:
  //  1) Send the HTTPS GET request.
  //  2) Get the response body.
  //  3) If the response status code indicates success, stream the response body (i.e the archive data) to a file.
  //  4) If the response status code indicates an error, get the JSON error response.

  //  Send the GET request.
  success := rest.SendReqNoBody('GET','/AWS_ACCOUNT_ID/vaults/chilkat/jobs/JOB_ID/output');
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Read the response header.
  responseStatusCode := rest.ReadResponseHeader();
  if (responseStatusCode < 0) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  WriteLn('Response status code = ' + responseStatusCode);

  //  We expect a 200 response status if the archive data is coming.
  //  Otherwise, we'll get a JSON response body with an error message(or no response body).
  if (responseStatusCode = 200) then
    begin

      bodyStream := TStream.Create;

      //  The stream's sink will be a file.
      bodyStream.SinkFile := 'qa_output/archiveData.dat';

      //  Read the response body to the stream.
      success := rest.ReadRespBodyStream(bodyStream,True);
      if (success <> True) then
        begin
          WriteLn(rest.LastErrorText);
          Exit;
        end;

      WriteLn('Successfully received the archive file.');

    end
  else
    begin
      jsonError := rest.ReadRespBodyString();
      if (rest.LastMethodSuccess <> True) then
        begin
          WriteLn(rest.LastErrorText);
        end
      else
        begin
          WriteLn(jsonError);
        end;
    end;


  rest.Free;
  authAws.Free;
      bodyStream.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.