Chilkat Online Tools

PollForTask Delphi (ActiveX) Example

AWS Data Pipeline

var
rest: TChilkatRest;
success: Integer;
authAws: TChilkatAuthAws;
json: TChilkatJsonObject;
sbRequestBody: TChilkatStringBuilder;
sbResponseBody: TChilkatStringBuilder;
respStatusCode: Integer;
jResp: TChilkatJsonObject;
key: WideString;
refValue: WideString;
stringValue: WideString;
AttemptId: WideString;
Id: WideString;
Name: WideString;
PipelineId: WideString;
TaskId: WideString;
i: Integer;
count_i: Integer;

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

rest := TChilkatRest.Create(Self);

authAws := TChilkatAuthAws.Create(Self);
authAws.AccessKey := 'AWS_ACCESS_KEY';
authAws.SecretKey := 'AWS_SECRET_KEY';

// Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
authAws.Region := 'us-west-2';
authAws.ServiceName := 'datapipeline';
// SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
rest.SetAuthAws(authAws.ControlInterface);

// URL: https://datapipeline.us-west-2.amazonaws.com/
// Use the same region as specified above.
success := rest.Connect('datapipeline.us-west-2.amazonaws.com',443,1,1);
if (success <> 1) then
  begin
    Memo1.Lines.Add('ConnectFailReason: ' + IntToStr(rest.ConnectFailReason));
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// The following code creates the JSON request body.
// The JSON created by this code is shown below.

// Use this online tool to generate code from sample JSON:
// Generate Code to Create JSON

json := TChilkatJsonObject.Create(Self);
json.UpdateString('hostname','string');
json.UpdateString('instanceIdentity.document','string');
json.UpdateString('instanceIdentity.signature','string');
json.UpdateString('workerGroup','string');

// The JSON request body created by the above code:

// {
//   "hostname": "string",
//   "instanceIdentity": {
//     "document": "string",
//     "signature": "string"
//   },
//   "workerGroup": "string"
// }

rest.AddHeader('Content-Type','application/x-amz-json-1.1');
rest.AddHeader('X-Amz-Target','DataPipeline.PollForTask');

sbRequestBody := TChilkatStringBuilder.Create(Self);
json.EmitSb(sbRequestBody.ControlInterface);
sbResponseBody := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestSb('POST','/',sbRequestBody.ControlInterface,sbResponseBody.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;
respStatusCode := rest.ResponseStatusCode;
Memo1.Lines.Add('response status code = ' + IntToStr(respStatusCode));
if (respStatusCode <> 200) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(rest.ResponseHeader);
    Memo1.Lines.Add('Response Body:');
    Memo1.Lines.Add(sbResponseBody.GetAsString());
    Exit;
  end;

jResp := TChilkatJsonObject.Create(Self);
jResp.LoadSb(sbResponseBody.ControlInterface);

// The following code parses the JSON response.
// A sample JSON response is shown below the sample code.

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

AttemptId := jResp.StringOf('taskObject.attemptId');
Id := jResp.StringOf('taskObject.objects.string.id');
Name := jResp.StringOf('taskObject.objects.string.name');
PipelineId := jResp.StringOf('taskObject.pipelineId');
TaskId := jResp.StringOf('taskObject.taskId');
i := 0;
count_i := jResp.SizeOfArray('taskObject.objects.string.fields');
while i < count_i do
  begin
    jResp.I := i;
    key := jResp.StringOf('taskObject.objects.string.fields[i].key');
    refValue := jResp.StringOf('taskObject.objects.string.fields[i].refValue');
    stringValue := jResp.StringOf('taskObject.objects.string.fields[i].stringValue');
    i := i + 1;
  end;

// A sample JSON response body parsed by the above code:

// {
//   "taskObject": {
//     "attemptId": "string",
//     "objects": {
//       "string": {
//         "fields": [
//           {
//             "key": "string",
//             "refValue": "string",
//             "stringValue": "string"
//           }
//         ],
//         "id": "string",
//         "name": "string"
//       }
//     },
//     "pipelineId": "string",
//     "taskId": "string"
//   }
// }