// Perform a relayr API operation. Takes the operation, URI arguments, and a dictionary
// of key -> value pairs (which will be converted to a JSON string) for operation content
public async Task<HttpResponseMessage> PerformHttpOperation(ApiCall operation, string[] arguments, Dictionary<string, string> content) {
// Get the URI extension and opration type from the attributes of the operation
Type type = operation.GetType();
FieldInfo field = type.GetRuntimeField(operation.ToString());
string uriExtension = ((UriAttribute) field.GetCustomAttribute(typeof(UriAttribute), false)).Value;
string operationType = ((OperationType) field.GetCustomAttribute(typeof(OperationType), false)).Value;
// Add the arguments to the URI, if required
uriExtension = processArguments(uriExtension, arguments);
// Create the content json, if required
StringContent contentJson = null;
if (content != null)
{
contentJson = new StringContent(createContentJson(content));
contentJson.Headers.ContentType = new MediaTypeHeaderValue("application/json");
}
// Set up the http request
HttpRequestMessage httpRequest = new HttpRequestMessage();
httpRequest.Method = new HttpMethod(operationType);
httpRequest.RequestUri = new Uri(uriExtension, UriKind.Relative);
httpRequest.Content = contentJson;
// Send the http request, return the response message
try
{
return await _httpClient.SendAsync(httpRequest);
}
catch(ProtocolViolationException e)
{
throw new InvalidOperationException("Cannot send content with operation of type " + operationType, e);
}
}
