private void HandleRequestInternal(HttpRequestArgs args)
{
// TODO: verify the performance of this pile of reflection
// any of the endpoints will do here; it's done this way in order to avoid hardcoding the namespace
string endpointsNamespace = typeof(StatusEndpoint).Namespace;
// get all endpoint classes
var allEndpoints = Assembly.GetExecutingAssembly().GetTypes().Where(x => x.Namespace == endpointsNamespace);
// get all endpoints that contain the HttpEndpointAttribute
var attributedEndpoints = allEndpoints.Select(x => new Tuple <Type, Attribute>(x, x.GetCustomAttribute(typeof(HttpEndpointAttribute)))).Where(x => x.Item2 != null);
// get the endpoint that should serve the request
var endpointTuple = attributedEndpoints.FirstOrDefault(x => ((HttpEndpointAttribute)x.Item2).ShouldServeRequest(args.Url));
if (endpointTuple == null)
{
// TODO: send some response
args.SetResponse(404, new HttpErrorResponse("Endpoint not found"));
return;
}
var endpointAttribute = (HttpEndpointAttribute)endpointTuple.Item2;
var endpoint = endpointTuple.Item1;
// locate the correct method for requested HTTP method
var attributedMethods = endpoint.GetMethods(BindingFlags.Public | BindingFlags.Static).Select(x => new Tuple <MethodInfo, Attribute>(x, x.GetCustomAttribute(typeof(HttpMethodAttribute)))).Where(x => x.Item2 != null);
var methodTuple = attributedMethods.FirstOrDefault(x => ((HttpMethodAttribute)x.Item2).Method == args.Context.Request.HttpMethod);
if (methodTuple == null)
{
// TODO: send some response
args.SetResponse(405, new HttpErrorResponse("HTTP method not supported for this endpoint"));
return;
}
// determine if the endpoint contains an asterisk
if (endpointAttribute.UrlContainsArguments)
{
args.UrlArguments = endpointAttribute.GetUrlArguments(args.Url);
}
// call the handler
methodTuple.Item1.Invoke(null, new object[] { args });
}
private void HandleRequest(HttpListenerContext ctx)
{
HttpRequestArgs args = new HttpRequestArgs(ctx);
ctx.Response.ContentType = "application/json";
// if the HTTP server is closing, ignore all incoming requests
if (isTerminating)
{
args.SetResponse(503, new HttpErrorResponse("The server is shutting down"));
}
else if (args.Url == null)
{
args.SetResponse(403, new HttpErrorResponse("Invalid API key"));
}
else
{
try
{
HandleRequestInternal(args);
}
catch (Exception ex)
{
args.SetResponse(500, new HttpErrorResponse($"An exception has occurred during request processing:\n{ex}"));
}
}
if (args.Response == null)
{
Logger.Log("Http", $"Request {args.Url} did not produce any response", Logger.MessageLevel.Warning);
args.Response = new HttpErrorResponse("Empty response");
}
byte[] resp = args.Response.ToJsonResponse();
ctx.Response.ContentLength64 = resp.LongLength;
ctx.Response.OutputStream.Write(resp);
ctx.Response.Close();
}
