Pascal (Lazarus/Delphi)

SSH Parallel Remote Commands on Single Server

See more SSH Examples

Shows how to execute multiple commands in parallel on a single SSH server and retrieve the command output for each. 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.Ssh;

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

procedure RunDemo;
var
  success: Boolean;
  ssh: TSsh;
  port: Integer;
  channel1: Integer;
  channel2: Integer;
  channel3: Integer;
  pollTimeoutMs: Integer;
  numFinished: Integer;
  channel: Integer;

begin
  success := False;

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

  ssh := TSsh.Create;

  port := 22;
  success := ssh.Connect('the-ssh-server.com',port);
  if (success <> True) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;

  //  Authenticate using login/password:
  success := ssh.AuthenticatePw('theSshLogin','theSshPassword');
  if (success <> True) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;

  //  Start several commands on the server.
  channel1 := ssh.QuickCmdSend('df');
  if (channel1 < 0) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;
  channel2 := ssh.QuickCmdSend('date');
  if (channel2 < 0) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;
  channel3 := ssh.QuickCmdSend('echo hello world');
  if (channel3 < 0) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;

  //  Now collect the results of each command.
  pollTimeoutMs := 50;
  numFinished := 0;
  while numFinished < 3 do
    begin
      //  Check to see if anything has finished.
      //  QuickCmdCheck returns -1 if there are no errors and nothing else finished
      //  QuickCmdCheck returns -2 if there was an error (such as a lost connection)
      //  QuickCmdCheck returns a channel number if a channel finished.
      channel := ssh.QuickCmdCheck(pollTimeoutMs);
      if (channel = -2) then
        begin
          WriteLn(ssh.LastErrorText);
          Exit;
        end;
      if (channel >= 0) then
        begin
          WriteLn('---- channel ' + channel + ' finished ----');
          WriteLn(ssh.GetReceivedText(channel,'ansi'));
          numFinished := numFinished + 1;
        end;
    end;

  //  --------------
  //  Sample output:

  //  	---- channel 105 finished ----
  //  	hello world
  //  
  //  	---- channel 104 finished ----
  //  	Thu Dec 22 17:43:58 CST 2016
  //  
  //  	---- channel 103 finished ----
  //  	Filesystem    512-blocks      Used  Available Capacity  iused     ifree %iused  Mounted on
  //  	/dev/disk2    2176716032 265739728 1910464304    13% 33281464 238808038   12%   /
  //  	devfs                382       382          0   100%      662         0  100%   /dev
  //  	map -hosts             0         0          0   100%        0         0  100%   /net
  //  	map auto_home          0         0          0   100%        0         0  100%   /home
  //  	/dev/disk3s2      374668    374668          0   100%    93665         0  100%   /Volumes/Google Chrome


  ssh.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.