(Delphi DLL) EC2 Check Instance Status

See more Amazon EC2 Examples

Demonstrates how to send a request to check the status of Amazon EC2 instances.

For more information, see https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeInstanceStatus.html

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, AuthAws, Rest, Xml;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: HCkRest;
bTls: Boolean;
port: Integer;
bAutoReconnect: Boolean;
success: Boolean;
authAws: HCkAuthAws;
responseXml: PWideChar;
xml: HCkXml;

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

rest := CkRest_Create();

// Connect to the Amazon AWS server.
// such as https://ec2.amazonaws.com/
bTls := True;
port := 443;
bAutoReconnect := True;
success := CkRest_Connect(rest,'ec2.us-west-2.amazonaws.com',port,bTls,bAutoReconnect);

// Provide AWS credentials for the REST call.
authAws := CkAuthAws_Create();
CkAuthAws_putAccessKey(authAws,'AWS_ACCESS_KEY');
CkAuthAws_putSecretKey(authAws,'AWS_SECRET_KEY');
// the region should match the region part of the domain passed to the REST connect method (above).
CkAuthAws_putRegion(authAws,'us-west-2');
CkAuthAws_putServiceName(authAws,'ec2');

CkRest_SetAuthAws(rest,authAws);

CkRest_AddQueryParam(rest,'Action','DescribeInstanceStatus');
CkRest_AddQueryParam(rest,'Version','2016-11-15');

CkRest_AddQueryParam(rest,'InstanceId.1','i-999719995399c9999');
// If you have additional instances to check, then add them with .2, .3, etc.
CkRest_AddQueryParam(rest,'InstanceId.2','i-999719995399c0000');
CkRest_AddQueryParam(rest,'InstanceId.3','i-999719995399c0111');
// ...

// Instead of checking specific instances, you can check all instances by 
// sending the IncludeAllInstances param
CkRest_AddQueryParam(rest,'IncludeAllInstances','true');

responseXml := CkRest__fullRequestNoBody(rest,'GET','/');
if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// A successful response will have a status code equal to 200.
if (CkRest_getResponseStatusCode(rest) <> 200) then
  begin
    Memo1.Lines.Add('response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
    Memo1.Lines.Add('response status text = ' + CkRest__responseStatusText(rest));
    Memo1.Lines.Add('response header: ' + CkRest__responseHeader(rest));
    Memo1.Lines.Add('response body: ' + responseXml);
    Exit;
  end;

// Examine the successful XML response.
xml := CkXml_Create();
CkXml_LoadXml(xml,responseXml);
Memo1.Lines.Add(CkXml__getXml(xml));

// Here is a sample response:

// Use this online tool to generate parsing code from sample XML: 
// Generate Parsing Code from XML

// <DescribeInstanceStatusResponse xmlns="http://ec2.amazonaws.com/doc/2016-11-15/">
//     <requestId>3be1508e-c444-4fef-89cc-0b1223c4f02fEXAMPLE</requestId>
//     <instanceStatusSet>
//         <item>
//             <instanceId>i-1234567890abcdef0</instanceId>
//             <availabilityZone>us-east-1d</availabilityZone>
//             <instanceState>
//                 <code>16</code>
//                 <name>running</name>
//             </instanceState>
//             <systemStatus>
//                 <status>impaired</status>
//                 <details>
//                     <item>
//                         <name>reachability</name>
//                         <status>failed</status>
//                         <impairedSince>YYYY-MM-DDTHH:MM:SS.000Z</impairedSince>
//                     </item>
//                 </details>
//             </systemStatus>
//             <instanceStatus>
//                 <status>impaired</status>
//                 <details>
//                     <item>
//                         <name>reachability</name>
//                         <status>failed</status>
//                         <impairedSince>YYYY-MM-DDTHH:MM:SS.000Z</impairedSince>
//                     </item>
//                 </details>
//             </instanceStatus>
//             <eventsSet>
//               <item>
//                 <code>instance-retirement</code>
//                 <description>The instance is running on degraded hardware</description>
//                 <notBefore>YYYY-MM-DDTHH:MM:SS+0000</notBefore>
//                 <notAfter>YYYY-MM-DDTHH:MM:SS+0000</notAfter>
//               </item>
//             </eventsSet>
//         </item>
//         <item>
//             <instanceId>i-0598c7d356eba48d7</instanceId>
//             <availabilityZone>us-east-1d</availabilityZone>
//             <instanceState>
//                 <code>16</code>
//                 <name>running</name>
//             </instanceState>
//             <systemStatus>
//                 <status>ok</status>
//                 <details>
//                     <item>
//                         <name>reachability</name>
//                         <status>passed</status>
//                     </item>
//                 </details>
//             </systemStatus>
//             <instanceStatus>
//                 <status>ok</status>
//                 <details>
//                     <item>
//                         <name>reachability</name>
//                         <status>passed</status>
//                     </item>
//                 </details>
//             </instanceStatus>
//             <eventsSet>
//               <item>
//                 <code>instance-reboot</code>
//                 <description>The instance is scheduled for a reboot</description>
//                 <notBefore>YYYY-MM-DDTHH:MM:SS+0000</notBefore>
//                 <notAfter>YYYY-MM-DDTHH:MM:SS+0000</notAfter>
//               </item>
//             </eventsSet>
//         </item>
//         <item>
//             <instanceId>i-0987654321abcdef0</instanceId>
//             <availabilityZone>us-east-1d</availabilityZone>
//             <instanceState>
//                 <code>16</code>
//                 <name>running</name>
//             </instanceState>
//             <systemStatus>
//                 <status>ok</status>
//                 <details>
//                     <item>
//                         <name>reachability</name>
//                         <status>passed</status>
//                     </item>
//                 </details>
//             </systemStatus>
//             <instanceStatus>
//                 <status>ok</status>
//                 <details>
//                     <item>
//                         <name>reachability</name>
//                         <status>passed</status>
//                     </item>
//                 </details>
//             </instanceStatus>
//         </item>
//         <item>
//             <instanceId>i-0598c7d356eba48d8</instanceId>
//             <availabilityZone>us-east-1d</availabilityZone>
//             <instanceState>
//                 <code>16</code>
//                 <name>running</name>
//             </instanceState>
//             <systemStatus>
//                 <status>ok</status>
//                 <details>
//                     <item>
//                         <name>reachability</name>
//                         <status>passed</status>
//                     </item>
//                 </details>
//             </systemStatus>
//             <instanceStatus>
//                 <status>insufficient-data</status>
//                 <details>
//                     <item>
//                         <name>reachability</name>
//                         <status>insufficient-data</status>
//                     </item>
//                 </details>
//             </instanceStatus>
//          </item>
//     </instanceStatusSet>
// </DescribeInstanceStatusResponse>

CkRest_Dispose(rest);
CkAuthAws_Dispose(authAws);
CkXml_Dispose(xml);

end;