static void Main(string[] args) { // Creating Needed Instances RequestsHandler httpClient = new RequestsHandler (); AppStoreParser parser = new AppStoreParser (); // Loading Configuration LogSetup.InitializeLog ("Apple_Store_Categories_Worker.log", "info"); _logger = LogManager.GetCurrentClassLogger (); // Loading Config _logger.Info ("Loading Configurations from App.config"); LoadConfiguration (); // Control Variable (Bool - Should the process use proxies? ) bool shouldUseProxies = false; // Checking for the need to use proxies if (args != null && args.Length == 1) { // Setting flag to true shouldUseProxies = true; // Loading proxies from .txt received as argument String fPath = args[0]; // Sanity Check if (!File.Exists (fPath)) { _logger.Fatal ("Couldnt find proxies on path : " + fPath); System.Environment.Exit (-100); } // Reading Proxies from File string[] fLines = File.ReadAllLines (fPath, Encoding.GetEncoding ("UTF-8")); try { // Actual Load of Proxies ProxiesLoader.Load (fLines.ToList ()); } catch (Exception ex) { _logger.Fatal (ex); System.Environment.Exit (-101); } } // AWS Queue Handler _logger.Info ("Initializing Queues"); AWSSQSHelper categoriesUrlQueue = new AWSSQSHelper (_categoriesQueueName , _maxMessagesPerDequeue, _awsKey, _awsKeySecret); AWSSQSHelper charactersUrlQueue = new AWSSQSHelper (_characterUrlsQueueName, _maxMessagesPerDequeue, _awsKey, _awsKeySecret); // Setting Error Flag to No Error ( 0 ) System.Environment.ExitCode = 0; // Initialiazing Control Variables int fallbackWaitTime = 1; _logger.Info ("Started Processing Category Urls"); do { try { // Dequeueing messages from the Queue if (!categoriesUrlQueue.DeQueueMessages()) { Thread.Sleep (_hiccupTime); // Hiccup continue; } // Checking for no message received, and false positives situations if (!categoriesUrlQueue.AnyMessageReceived()) { // If no message was found, increases the wait time int waitTime; if (fallbackWaitTime <= 12) { // Exponential increase on the wait time, truncated after 12 retries waitTime = Convert.ToInt32 (Math.Pow (2, fallbackWaitTime) * 1000); } else // Reseting Wait after 12 fallbacks { waitTime = 2000; fallbackWaitTime = 0; } fallbackWaitTime++; // Sleeping before next try _logger.Info ("Fallback (seconds) => " + waitTime); Thread.Sleep (waitTime); continue; } // Reseting fallback time fallbackWaitTime = 1; // Iterating over dequeued Messages foreach (var categoryUrl in categoriesUrlQueue.GetDequeuedMessages()) { // Console Feedback _logger.Info ("Started Parsing Category : " + categoryUrl.Body); try { // Retries Counter int retries = 0; string htmlResponse; // Retrying if necessary do { // Executing Http Request for the Category Url htmlResponse = httpClient.Get (categoryUrl.Body, shouldUseProxies); if (String.IsNullOrEmpty (htmlResponse)) { _logger.Error ("Retrying Request for Category Page"); retries++; } } while (String.IsNullOrWhiteSpace (htmlResponse) && retries <= _maxRetries); // Checking if retries failed if (String.IsNullOrWhiteSpace (htmlResponse)) { // Deletes Message and moves on categoriesUrlQueue.DeleteMessage (categoryUrl); continue; } // If the request worked, parses the urls out of the page foreach (string characterUrls in parser.ParseCharacterUrls (htmlResponse)) { // Enqueueing Urls charactersUrlQueue.EnqueueMessage (HttpUtility.HtmlDecode (characterUrls)); } } catch (Exception ex) { _logger.Error (ex); } finally { // Deleting the message categoriesUrlQueue.DeleteMessage(categoryUrl); } } } catch (Exception ex) { _logger.Error (ex); } } while (true); }