/// <summary>
/// Initialize a connection the the Apple Push Notification Service (APNS) and deliver a new deal notification
/// payload to all registered devices in the database.
/// </summary>
/// <param name="currentHeadline">The headline to be sent in the push notification payload</param>
private void SendNotifications(int id, string headline)
{
//configure and start Apple APNS
PushNotification push;
try {
push = new PushNotification(false, Path.Combine(AppDomain.CurrentDomain.BaseDirectory, this.key), ConfigurationManager.AppSettings["certPassword"]);
}
catch (Exception e) {
LogError("!Failed to start service.", e);
return;
}
IList<DeviceToken> deviceTokens = null;
try {
//get a list of all registered device tokens
using (PushModelContainer context = new PushModelContainer())
{
var q = (from dt in context.DeviceTokens
//where dt.Development.Equals(true)
where dt.Development.Equals(this.isDevelopment)
where dt.AppName.Equals(this.appName)
where dt.Active.Equals(true)
select dt);
deviceTokens = q.ToList<DeviceToken>();
foreach (DeviceToken deviceToken in deviceTokens) {
if (deviceToken.BadgeCount > 50) {
deviceToken.BadgeCount = 0;
} else {
deviceToken.BadgeCount++;
}
}
context.SaveChanges();
}
}
catch (Exception e) {
LogError("!Failed to fetch device tokens.", e);
return;
}
//hold a list of payloads to be pushed
var payloads = new List<NotificationPayload> {};
//loop for every registered device token
foreach (DeviceToken deviceToken in deviceTokens) {
//add the payload to the list
var payload = new NotificationPayload(deviceToken.Token, ModifyHeadline(headline), deviceToken.BadgeCount, "default");
payload.AddCustom("id", id);
payloads.Add(payload);
}
//send the payloads and get a list of rejected payloads for deletion
Logger.Info(@" >Delivering payloads...");
var rejectedTokens = push.SendToApple(payloads);
if (rejectedTokens.Count > 0) {
//deactivate all rejected device tokens
using (PushModelContainer context = new PushModelContainer())
{
foreach (var rejectedToken in rejectedTokens) {
Logger.Warn(@"Deactivating token: " + rejectedToken);
DeviceToken deviceToken = (from dt in context.DeviceTokens
where dt.Token.Equals(rejectedToken)
select dt).FirstOrDefault();
if (deviceToken != null) {
deviceToken.Active = false;
}
}
context.SaveChanges();
}
}
Logger.Info(@" >All payloads delivered.");
Logger.Info(@"");
}
/// <summary>
/// Access the Passwird Deals API for a list of deals. Checks the newest deal posted against
/// a deal that was persisted to the database. If they do not match, push notifications are sent
/// to all registered devices for the new deal.
/// </summary>
private void PollDeals()
{
bool isNewDeal = false, shouldSendNotification = false;
LastDeal lastDeal;
Deal currentDeal;
RootDeal rootDeal;
//grab a copy of current deals
using (WebClient wc = new WebClient())
{
try {
//parse deal json into objects
var json = wc.DownloadString(this.apiUrl);
rootDeal = JsonConvert.DeserializeObject<RootDeal>(json);
currentDeal = new Deal(rootDeal.deals[0]);
}
catch (Exception e) {
LogError("!Failed to parse deals.", e);
return;
}
}
//return if no deals were in the collection
if (rootDeal.deals.Count <= 0) {
LogError("!No deals found.", null);
return;
}
try {
//get the most recent lastDeal saved to the database for comparison
using (PushModelContainer context = new PushModelContainer())
{
lastDeal = (from ld in context.LastDeals
orderby ld.id descending
select ld).FirstOrDefault();
}
}
catch (Exception e) {
LogError("!Could not fetch last deal.", e);
return;
}
//compare the last deal with the current deal
//considering the headline to be unique key for deals, not ideal obviously
//but I am limited in what I can get back from scraping the passwird site
if (currentDeal.headline == @"Currently experiencing technical difficulties.") {
isNewDeal = false;
} else if (currentDeal.headline.Truncate(25) != lastDeal.headline.Truncate(25)) {
isNewDeal = true;
}
if (isNewDeal) {
//found a new deal, send a notification
Logger.Info(@" >Found new deal.");
Logger.Info(@" >" + currentDeal.headline);
try {
//save the current deal as the last deal to the database
using (PushModelContainer context = new PushModelContainer())
{
//save the current deal as a new last deal record in the database
//v1
lastDeal = new LastDeal();
lastDeal.headline = currentDeal.headline;
lastDeal.datePosted = currentDeal.datePosted;
lastDeal.body = currentDeal.body;
lastDeal.image = currentDeal.image;
lastDeal.isExpired = currentDeal.isExpired;
//v2
lastDeal.C_id = currentDeal.id;
lastDeal.legacy = currentDeal.legacy;
lastDeal.hot = currentDeal.hot;
lastDeal.free = currentDeal.free;
lastDeal.price = currentDeal.price;
lastDeal.slug = currentDeal.slug;
lastDeal.sHeadline = currentDeal.sHeadline;
lastDeal.author = currentDeal.author;
lastDeal.expirationDate = currentDeal.expirationDate;
context.LastDeals.AddObject(lastDeal);
context.SaveChanges();
}
shouldSendNotification = true;
if (lastDeal.headline == "root") shouldSendNotification = true;
}
catch (Exception e) {
LogError("!Failed to save last deal.", e);
return;
}
}
//if a new deal was found, start sending notifications
if (shouldSendNotification) {
SendNotifications(lastDeal.id, currentDeal.headline);
}
}
