Pascal (Lazarus/Delphi)

Azure Storage: Get Blob Service Stats

See more Azure Cloud Storage Examples

Azure Storage Blob Service REST API: Sample code to get Blob Service Stats 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.DtObj,
  Chilkat.Rest,
  Chilkat.AuthAzureStorage,
  Chilkat.Xml,
  Chilkat.CkDateTime;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  port: Integer;
  bAutoReconnect: Boolean;
  azAuth: TAuthAzureStorage;
  responseStr: string;
  xml: TXml;
  lastSyncTimeStr: string;
  dateTime: TCkDateTime;
  bLocalTime: Boolean;
  dt: TDtObj;

begin
  success := False;

  //  Azure Blob Service Example: Get Blob Service Stats

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

  rest := TRest.Create;

  //  Connect to the Azure Storage Blob Service
  bTls := True;
  port := 443;
  bAutoReconnect := True;
  //  In this example, the storage account name is "chilkat".
  //  ---- IMPORTANT ----
  //  The "-secondary" suffix is required.
  //  This requires an Azure storage account with replication set to "Read-access geo-redundant storage (RA-GRS)"
  //  If you made the change just prior to testing this example, you'll need to give it time for the 
  //  DNS to become available..  
  //  ---- IMPORTANT ----
  success := rest.Connect('chilkat-secondary.blob.core.windows.net',port,bTls,bAutoReconnect);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Provide Azure Cloud credentials for the REST call.
  azAuth := TAuthAzureStorage.Create;
  azAuth.AccessKey := 'AZURE_ACCESS_KEY';
  //  The account name used here should match the 1st part of the domain passed in the call to Connect (above).
  azAuth.Account := 'chilkat';
  azAuth.Scheme := 'SharedKey';
  azAuth.Service := 'Blob';
  //  This causes the "x-ms-version: 2021-08-06" header to be automatically added.
  azAuth.XMsVersion := '2021-08-06';
  success := rest.SetAuthAzureStorage(azAuth);

  //  Note: The application does not need to explicitly set the following
  //  headers: x-ms-date, Authorization.  These headers
  //  are automatically set by Chilkat.

  responseStr := rest.FullRequestNoBody('GET','/?restype=service&comp=stats');
  if (rest.LastMethodSuccess = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  When successful, the Azure Storage service will respond with a 200 response code,
  //  with an XML body.  
  if (rest.ResponseStatusCode <> 200) then
    begin
      //  Examine the request/response to see what happened.
      WriteLn('response status code = ' + rest.ResponseStatusCode);
      WriteLn('response status text = ' + rest.ResponseStatusText);
      WriteLn('response header: ' + rest.ResponseHeader);
      WriteLn('response body (if any): ' + responseStr);
      WriteLn('---');
      WriteLn('LastRequestStartLine: ' + rest.LastRequestStartLine);
      WriteLn('LastRequestHeader: ' + rest.LastRequestHeader);
      Exit;
    end;

  //  Load the XML response for parsing.
  //  An example of the response XML is shown below.
  xml := TXml.Create;
  success := xml.LoadXml(responseStr);

  WriteLn(xml.GetXml());

  //  Use the ChilkatPath method to get various pieces of information out
  //  of the XML.  For example:

  WriteLn('Status = ' + xml.ChilkatPath('GeoReplication|Status|*'));
  lastSyncTimeStr := xml.ChilkatPath('GeoReplication|LastSyncTime|*');
  WriteLn('LastSyncTime = ' + lastSyncTimeStr);

  //  The date/time string can be loaded into a CkDateTime object for 
  //  access to individual parts, or conversion to other formats.
  dateTime := TCkDateTime.Create;
  success := dateTime.SetFromRfc822(lastSyncTimeStr);

  //  For example:
  bLocalTime := True;
  dt := TDtObj.Create;
  dateTime.ToDtObj(bLocalTime,dt);

  WriteLn(dt.Year + '/' + dt.Month + '/' + dt.Day);

  //  <StorageServiceStats>
  //      <GeoReplication>
  //          <Status>live</Status>
  //          <LastSyncTime>Tue, 03 May 2016 23:57:54 GMT</LastSyncTime>
  //      </GeoReplication>
  //  </StorageServiceStats>


  rest.Free;
  azAuth.Free;
  xml.Free;
  dateTime.Free;
  dt.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.