private void AddHeaders(ApiCallCommand <TRequest, TResult> apiRequest, ref HttpRequestMessage request)
{
foreach (var item in apiRequest.Headers)
{
request.Headers.Add(item.Key, item.Value);
}
}
public async Task <TResult> HandleRequestAsync(ApiCallCommand <TRequest, TResult> apiRequest = null)
{
HttpResponseMessage response = new HttpResponseMessage();
apiRequest = apiRequest ?? ApiRequest;
if (!ValidateApiCallRequest(apiRequest))
{
return(null);
}
using (var client = new HttpClient())
{
var request = PostRequestAction?.Invoke(apiRequest.RequestObject);
AddRequestUri(apiRequest, ref request);
AddHeaders(apiRequest, ref request);
return(await Retry
.WithIncremental(retryCount : 5, initialInterval : TimeSpan.FromSeconds(1),
increment : TimeSpan.FromSeconds(1))
.Catch <OperationCanceledException>()
.Catch <HttpRequestException>(exception => exception is HttpRequestException && response.StatusCode == HttpStatusCode.RequestTimeout)
.ExecuteAction(async() =>
{
response = await client.SendAsync(request);
var resultToReturn = PreRequestAction?.Invoke(response);
return resultToReturn;
}));
}
}
private void AddRequestUri(ApiCallCommand <TRequest, TResult> apiRequest, ref HttpRequestMessage request)
{
var queryString = apiRequest.Parameters?.Count > 0 ? $"?{GetParametersString(apiRequest.Parameters)}" : "";
var subPath = !String.IsNullOrEmpty(apiRequest.Operation_SubPath) ? $"/{apiRequest.Operation_SubPath}" : "";
var requestUriString = $"{apiRequest.Endpoint_Uri}/{apiRequest.Endpoint_Version}/{apiRequest.Operation_Path}{subPath}{queryString}";
request.Method = new HttpMethod(apiRequest.Operation_Method);
request.RequestUri = new Uri(requestUriString);
}
private bool ValidateApiCallRequest(ApiCallCommand <TRequest, TResult> apiRequest)
{
List <ValidationResult> validationResults = new List <ValidationResult>();
ValidationContext context = new ValidationContext(apiRequest.RequestObject);
Validator.TryValidateObject(apiRequest.RequestObject, context, validationResults);
return(validationResults.Count == 0);
}
public ApiCommandHandler(
ApiCallCommand <TRequest, TResult> apiRequest,
Func <TRequest, HttpRequestMessage> postRequestAction = null,
Func <HttpResponseMessage, TResult> preRequestAction = null)
{
ApiRequest = apiRequest;
PostRequestAction = postRequestAction == null
? apiRequest.Headers["ContentType"] == "application/json" ? GetPostRequestAction() : GetPostStreamRequestAction()
: postRequestAction;
PreRequestAction = preRequestAction == null
? GetPreRequestAction() : preRequestAction;
}
