/// <summary>
/// Entry point of the worker piece of the process
/// Notice that you can run as many workers as you want to in order to make the crawling faster
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
// Configuring Log Object Threshold
LogWriter.Threshold = TLogEventLevel.Information;
LogWriter.Info("Worker Started");
// Parser
PlayStoreParser parser = new PlayStoreParser();
// Configuring MongoDB Wrapper
MongoDBWrapper mongoDB = new MongoDBWrapper();
string fullServerAddress = String.Join(":", Consts.MONGO_SERVER, Consts.MONGO_PORT);
mongoDB.ConfigureDatabase(Consts.MONGO_USER, Consts.MONGO_PASS, Consts.MONGO_AUTH_DB, fullServerAddress, Consts.MONGO_TIMEOUT, Consts.MONGO_DATABASE, Consts.MONGO_COLLECTION);
// Creating Instance of Web Requests Server
WebRequests server = new WebRequests();
QueuedApp app;
// Retry Counter (Used for exponential wait increasing logic)
int retryCounter = 0;
// Iterating Over MongoDB Records while no document is found to be processed
while ((app = mongoDB.FindAndModify()) != null)
{
try
{
// Building APP URL
string appUrl = Consts.APP_URL_PREFIX + app.Url;
// Checking if this app is on the database already
if (mongoDB.AppProcessed(appUrl))
{
// Console Feedback, Comment this line to disable if you want to
Console.WriteLine("Duplicated App, skipped.");
// Delete it from the queue and continues the loop
mongoDB.RemoveFromQueue(app.Url);
continue;
}
// Configuring server and Issuing Request
server.Headers.Add(Consts.ACCEPT_LANGUAGE);
server.Host = Consts.HOST;
server.Encoding = "utf-8";
server.EncodingDetection = WebRequests.CharsetDetection.DefaultCharset;
string response = server.Get(appUrl);
// Flag Indicating Success while processing and parsing this app
bool ProcessingWorked = true;
// Sanity Check
if (String.IsNullOrEmpty(response) || server.StatusCode != System.Net.HttpStatusCode.OK)
{
LogWriter.Info("Error opening app page : " + appUrl);
ProcessingWorked = false;
// Renewing WebRequest Object to get rid of Cookies
server = new WebRequests();
// Inc. retry counter
retryCounter++;
Console.WriteLine("Retrying:" + retryCounter);
// Checking for maximum retry count
double waitTime;
if (retryCounter >= 11)
{
waitTime = TimeSpan.FromMinutes(35).TotalMilliseconds;
// Removing App from the database (this the app page may have expired)
mongoDB.RemoveFromQueue(app.Url);
}
else
{
// Calculating next wait time ( 2 ^ retryCounter seconds)
waitTime = TimeSpan.FromSeconds(Math.Pow(2, retryCounter)).TotalMilliseconds;
}
// Hiccup to avoid google blocking connections in case of heavy traffic from the same IP
Thread.Sleep(Convert.ToInt32(waitTime));
}
else
{
// Reseting retry counter
retryCounter = 0;
// Parsing Useful App Data
AppModel parsedApp = parser.ParseAppPage(response, appUrl);
// Inserting App into Mongo DB Database
if (!mongoDB.Insert <AppModel>(parsedApp))
{
ProcessingWorked = false;
}
// If the processing failed, do not remove the app from the database, instead, keep it and flag it as not busy
// so that other workers can try to process it later
if (!ProcessingWorked)
{
mongoDB.ToggleBusyApp(app, false);
}
else // On the other hand, if processing worked, removes it from the database
{
// Console Feedback, Comment this line to disable if you want to
Console.WriteLine("Inserted App : " + parsedApp.Name);
mongoDB.RemoveFromQueue(app.Url);
}
// Counters for console feedback only
int extraAppsCounter = 0, newExtraApps = 0;
// Parsing "Related Apps" and "More From Developer" Apps (URLS Only)
foreach (string extraAppUrl in parser.ParseExtraApps(response))
{
// Incrementing counter of extra apps
extraAppsCounter++;
// Assembling Full app Url to check with database
string fullExtraAppUrl = Consts.APP_URL_PREFIX + extraAppUrl;
// Checking if the app was either processed or queued to be processed already
if ((!mongoDB.AppProcessed(fullExtraAppUrl)) && (!mongoDB.IsAppOnQueue(extraAppUrl)))
{
// Incrementing counter of inserted apps
newExtraApps++;
// Adds it to the queue of apps to be processed
mongoDB.AddToQueue(extraAppUrl);
}
}
// Console Feedback
Console.WriteLine("Queued " + newExtraApps + " / " + extraAppsCounter + " related apps");
}
}
catch (Exception ex)
{
LogWriter.Error(ex);
}
finally
{
try
{
// Toggles Busy status back to false
mongoDB.ToggleBusyApp(app, false);
}
catch (Exception ex)
{
// Toggle Busy App may raise an exception in case of lack of internet connection, so, i must use this
// "inner catch" to avoid it from happenning
LogWriter.Error(ex);
}
}
}
}
/// <summary>
/// Entry point of the worker piece of the process
/// Notice that you can run as many workers as you want to in order to make the crawling faster
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
// Configuring Log Object
LogSetup.InitializeLog("PlayStoreWorker.log", "info");
Logger logger = LogManager.GetCurrentClassLogger();
logger.Info("Worker Started");
// Control Variable (Bool - Should the process use proxies? )
bool isUsingProxies = false;
// Checking for the need to use proxies
if (args != null && args.Length == 1)
{
// Setting flag to true
isUsingProxies = 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);
}
}
// Parser
PlayStoreParser parser = new PlayStoreParser();
// Configuring MongoDB Wrapper
MongoDBWrapper mongoDB = new MongoDBWrapper();
string fullServerAddress = String.Join(":", Consts.MONGO_SERVER, Consts.MONGO_PORT);
mongoDB.ConfigureDatabase(Consts.MONGO_USER, Consts.MONGO_PASS, Consts.MONGO_AUTH_DB, fullServerAddress, Consts.MONGO_TIMEOUT, Consts.MONGO_DATABASE, Consts.MONGO_COLLECTION);
/*
* // populate min downloaded & max downloaded
* int count = 0;
* var apps = mongoDB.FindAll<AppModel>();
* foreach(var a in apps)
* {
* a.FillMinAndMaxInstalls();
++count;
*
* if((count % 100) == 0)
* {
* Console.WriteLine("updated {0}", count);
* }
*
* if (!mongoDB.UpsertKeyEq<AppModel>(a, "Url", a.Url))
* {
* Console.WriteLine("UpsertKey failed");
* }
* }
*/
// Creating Instance of Web Requests Server
WebRequests server = new WebRequests();
// Queued App Model
QueuedApp app;
// Retry Counter (Used for exponential wait increasing logic)
int retryCounter = 0;
// Iterating Over MongoDB Records while no document is found to be processed
while ((app = mongoDB.FindAndModify()) != null)
{
try
{
// Building APP URL
string appUrl = app.Url;
// Sanity check of app page url
if (app.Url.IndexOf("http", StringComparison.OrdinalIgnoreCase) < 0)
{
appUrl = Consts.APP_URL_PREFIX + app.Url;
}
// Checking if this app is on the database already
if (mongoDB.AppProcessed(appUrl))
{
// Console Feedback, Comment this line to disable if you want to
logger.Info("Duplicated App, skipped.");
// Delete it from the queue and continues the loop
mongoDB.RemoveFromQueue(app.Url);
continue;
}
// Configuring server and Issuing Request
server.Headers.Add(Consts.ACCEPT_LANGUAGE);
server.Host = Consts.HOST;
server.UserAgent = Consts.GITHUBURL;
server.Encoding = "utf-8";
server.EncodingDetection = WebRequests.CharsetDetection.DefaultCharset;
// Checking for the need to use "HTTP Proxies"
if (isUsingProxies)
{
server.Proxy = ProxiesLoader.GetWebProxy();
}
// Issuing HTTP Request
string response = server.Get(appUrl);
// Flag Indicating Success while processing and parsing this app
bool ProcessingWorked = true;
// Sanity Check
if (String.IsNullOrEmpty(response) || server.StatusCode != System.Net.HttpStatusCode.OK)
{
logger.Info("Error opening app page : " + appUrl);
ProcessingWorked = false;
if (isUsingProxies)
{
ProxiesLoader.IncrementCurrentProxy();
}
// Renewing WebRequest Object to get rid of Cookies
server = new WebRequests();
// Fallback time variable
double waitTime;
// Checking which "Waiting Logic" to use - If there are proxies being used, there's no need to wait too much
// If there are no proxies in use, on the other hand, the process must wait more time
if (isUsingProxies)
{
// Waits two seconds everytime
waitTime = TimeSpan.FromSeconds(2).TotalMilliseconds;
}
else
{
// Increments retry counter
retryCounter++;
// Checking for maximum retry count
if (retryCounter >= 8)
{
waitTime = TimeSpan.FromMinutes(20).TotalMilliseconds;
}
else
{
// Calculating next wait time ( 2 ^ retryCounter seconds)
waitTime = TimeSpan.FromSeconds(Math.Pow(2, retryCounter)).TotalMilliseconds;
}
}
// Hiccup to avoid google blocking connections in case of heavy traffic from the same IP
logger.Info("======================================================");
logger.Info("\n\tFallback : " + waitTime + " Seconds");
Thread.Sleep(Convert.ToInt32(waitTime));
// If The Status code is "ZERO" (it means 404) - App must be removed from "Queue"
if (server.StatusCode == 0)
{
// Console Feedback
logger.Info("\tApp Not Found (404) - " + app.Url);
mongoDB.RemoveFromQueue(app.Url);
}
logger.Info("======================================================");
}
else
{
// Reseting retry counter
retryCounter = 0;
// Parsing Useful App Data
AppModel parsedApp = parser.ParseAppPage(response, appUrl);
// Normalizing URLs
if (!String.IsNullOrWhiteSpace(parsedApp.DeveloperPrivacyPolicy))
{
parsedApp.DeveloperPrivacyPolicy = parsedApp.DeveloperPrivacyPolicy.Replace("https://www.google.com/url?q=", String.Empty);
}
if (!String.IsNullOrWhiteSpace(parsedApp.DeveloperWebsite))
{
parsedApp.DeveloperNormalizedDomain = parser.NormalizeDomainName(parsedApp.DeveloperWebsite);
}
List <String> relatedApps = new List <String> ();
// Avoiding Exceptions caused by "No Related Apps" situations - Must be treated differently
try
{
// Parsing "Related Apps" and "More From Developer" Apps (URLS Only)
foreach (string extraAppUrl in parser.ParseExtraApps(response))
{
relatedApps.Add(Consts.APP_URL_PREFIX + extraAppUrl);
}
// Adding "Related Apps" to Apps Model
parsedApp.RelatedUrls = relatedApps.Distinct().ToArray();
}
catch
{
logger.Info("\tNo Related Apps Found. Skipping");
}
// Inserting App into Mongo DB Database
if (!mongoDB.UpsertKeyEq <AppModel>(parsedApp, "Url", appUrl))
{
ProcessingWorked = false;
}
// If the processing failed, do not remove the app from the database, instead, keep it and flag it as not busy
// so that other workers can try to process it later
if (!ProcessingWorked)
{
mongoDB.ToggleBusyApp(app, false);
}
else // On the other hand, if processing worked, removes it from the database
{
// Console Feedback, Comment this line to disable if you want to
Console.ForegroundColor = ConsoleColor.Red;
logger.Info("Inserted App : " + parsedApp.Name);
Console.ForegroundColor = ConsoleColor.White;
mongoDB.RemoveFromQueue(app.Url);
}
// Counters for console feedback only
int extraAppsCounter = 0, newExtraApps = 0;
// Parsing "Related Apps" and "More From Developer" Apps (URLS Only)
foreach (string extraAppUrl in relatedApps)
{
// Incrementing counter of extra apps
extraAppsCounter++;
// Assembling Full app Url to check with database
string fullExtraAppUrl;
if (extraAppUrl.IndexOf("https://play.google.com/") >= 0)
{
fullExtraAppUrl = extraAppUrl;
}
else
{
fullExtraAppUrl = Consts.APP_URL_PREFIX + extraAppUrl;
}
// Checking if the app was either processed or queued to be processed already
if ((!mongoDB.AppProcessed(fullExtraAppUrl)) && (!mongoDB.IsAppOnQueue(extraAppUrl)))
{
// Incrementing counter of inserted apps
newExtraApps++;
// Adds it to the queue of apps to be processed
mongoDB.AddToQueue(extraAppUrl);
}
}
// Console Feedback
logger.Info("Queued " + newExtraApps + " / " + extraAppsCounter + " related apps");
}
}
catch (Exception ex)
{
logger.Error(ex);
}
finally
{
try
{
// Toggles Busy status back to false
mongoDB.ToggleBusyApp(app, false);
}
catch (Exception ex)
{
// Toggle Busy App may raise an exception in case of lack of internet connection, so, i must use this
// "inner catch" to avoid it from happenning
logger.Error(ex);
}
}
}
}