public static XmlDocument makeRequest(string url, string method, string body = null)
{
var request = WebRequest.CreateHttp(url);
request.Method = method;
var header = new MKMAuth.OAuthHeader();
request.Headers.Add(HttpRequestHeader.Authorization, header.getAuthorizationHeader(method, url));
request.Method = method;
if (body != null)
{
request.ServicePoint.Expect100Continue = false;
request.ContentLength = body.Length;
request.ContentType = "text/xml";
var writer = new StreamWriter(request.GetRequestStream());
writer.Write(body);
writer.Close();
}
var response = request.GetResponse() as HttpWebResponse;
var doc = new XmlDocument();
doc.Load(response.GetResponseStream());
return(doc);
}
private static System.DateTime denyTime; // to know when denyAdditionalRequests was switched, if we pass to another day, reset it
/// <summary>
/// Makes a request from MKM's API.
/// If the daily request limit has been reached, does not send the request and instead throws an exception.
/// </summary>
/// <param name="url">The http URL of the API.</param>
/// <param name="method">The name of the request method (PUT, GET, etc.).</param>
/// <param name="body">The body containing parameters of the method if applicable.</param>
/// <returns>Document containing the response from MKM. In some cases this can empty (when the response is "nothing matches your request").</returns>
/// <exception cref="HttpListenerException">429 - Too many requests. Wait for 0:00 CET for request counter to reset.</exception>
/// <exception cref="APIProcessingExceptions">Many different network-based exceptions.</exception>
public static XmlDocument makeRequest(string url, string method, string body = null)
{
// throw the exception ourselves to prevent sending requests to MKM that would end with this error
// because MKM tends to revoke the user's app token if it gets too many requests above the limit
// the 429 code is the same MKM uses for this error
if (denyAdditionalRequests)
{
// MKM resets the counter at 0:00 CET. CET is two hours ahead of UCT, so if it is after 22:00 of the same day
// the denial was triggered, that means the 0:00 CET has passed and we can reset the deny
if (System.DateTime.UtcNow.Date == denyTime.Date && System.DateTime.UtcNow.Hour < 22)
{
throw new HttpListenerException(429, "Too many requests. Wait for 0:00 CET for request counter to reset.");
}
else
{
denyAdditionalRequests = false;
}
}
XmlDocument doc = new XmlDocument();
var request = WebRequest.CreateHttp(url);
request.Method = method;
var header = new MKMAuth.OAuthHeader();
request.Headers.Add(HttpRequestHeader.Authorization, header.getAuthorizationHeader(method, url));
request.Method = method;
if (body != null)
{
request.ServicePoint.Expect100Continue = false;
request.ContentLength = body.Length;
request.ContentType = "text/xml";
var writer = new StreamWriter(request.GetRequestStream());
writer.Write(body);
writer.Close();
}
var response = request.GetResponse() as HttpWebResponse;
// just for checking EoF, it is not accessible directly from the Stream object
// Empty streams can be returned for example for article fetches that result in 0 matches (happens regularly when e.g. seeking nonfoils in foil-only promo sets).
// Passing empty stream to doc.Load causes exception and also sometimes seems to screw up the XML parser
// even when the exception is handled and it then causes problems for subsequent calls => first check if the stream is empty
StreamReader s = new StreamReader(response.GetResponseStream());
if (!s.EndOfStream)
{
doc.Load(s);
}
s.Close();
int requestCount = int.Parse(response.Headers.Get("X-Request-Limit-Count"));
int requestLimit = int.Parse(response.Headers.Get("X-Request-Limit-Max"));
if (requestCount >= requestLimit)
{
denyAdditionalRequests = true;
denyTime = System.DateTime.UtcNow;
}
MainView.Instance.Invoke(new MainView.updateRequestCountCallback(MainView.Instance.updateRequestCount), requestCount, requestLimit);
return(doc);
}
