Chilkat Online Tools

PollForTask delphiDll Example

AWS Data Pipeline

var
rest: HCkRest;
success: Boolean;
authAws: HCkAuthAws;
json: HCkJsonObject;
sbRequestBody: HCkStringBuilder;
sbResponseBody: HCkStringBuilder;
respStatusCode: Integer;
jResp: HCkJsonObject;
key: PWideChar;
refValue: PWideChar;
stringValue: PWideChar;
AttemptId: PWideChar;
Id: PWideChar;
Name: PWideChar;
PipelineId: PWideChar;
TaskId: PWideChar;
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 := CkRest_Create();

authAws := CkAuthAws_Create();
CkAuthAws_putAccessKey(authAws,'AWS_ACCESS_KEY');
CkAuthAws_putSecretKey(authAws,'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.)
CkAuthAws_putRegion(authAws,'us-west-2');
CkAuthAws_putServiceName(authAws,'datapipeline');
// SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
CkRest_SetAuthAws(rest,authAws);

// URL: https://datapipeline.us-west-2.amazonaws.com/
// Use the same region as specified above.
success := CkRest_Connect(rest,'datapipeline.us-west-2.amazonaws.com',443,True,True);
if (success <> True) then
  begin
    Memo1.Lines.Add('ConnectFailReason: ' + IntToStr(CkRest_getConnectFailReason(rest)));
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    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 := CkJsonObject_Create();
CkJsonObject_UpdateString(json,'hostname','string');
CkJsonObject_UpdateString(json,'instanceIdentity.document','string');
CkJsonObject_UpdateString(json,'instanceIdentity.signature','string');
CkJsonObject_UpdateString(json,'workerGroup','string');

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

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

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

sbRequestBody := CkStringBuilder_Create();
CkJsonObject_EmitSb(json,sbRequestBody);
sbResponseBody := CkStringBuilder_Create();
success := CkRest_FullRequestSb(rest,'POST','/',sbRequestBody,sbResponseBody);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;
respStatusCode := CkRest_getResponseStatusCode(rest);
Memo1.Lines.Add('response status code = ' + IntToStr(respStatusCode));
if (respStatusCode <> 200) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkRest__responseHeader(rest));
    Memo1.Lines.Add('Response Body:');
    Memo1.Lines.Add(CkStringBuilder__getAsString(sbResponseBody));
    Exit;
  end;

jResp := CkJsonObject_Create();
CkJsonObject_LoadSb(jResp,sbResponseBody);

// 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 := CkJsonObject__stringOf(jResp,'taskObject.attemptId');
Id := CkJsonObject__stringOf(jResp,'taskObject.objects.string.id');
Name := CkJsonObject__stringOf(jResp,'taskObject.objects.string.name');
PipelineId := CkJsonObject__stringOf(jResp,'taskObject.pipelineId');
TaskId := CkJsonObject__stringOf(jResp,'taskObject.taskId');
i := 0;
count_i := CkJsonObject_SizeOfArray(jResp,'taskObject.objects.string.fields');
while i < count_i do
  begin
    CkJsonObject_putI(jResp,i);
    key := CkJsonObject__stringOf(jResp,'taskObject.objects.string.fields[i].key');
    refValue := CkJsonObject__stringOf(jResp,'taskObject.objects.string.fields[i].refValue');
    stringValue := CkJsonObject__stringOf(jResp,'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"
//   }
// }

CkRest_Dispose(rest);
CkAuthAws_Dispose(authAws);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbRequestBody);
CkStringBuilder_Dispose(sbResponseBody);
CkJsonObject_Dispose(jResp);