/// <summary>
/// Handles the notifications events sent by SendGrid.
/// </summary>
/// <param name="events">An array of the events that have occurred.</param>
public void Post(SendGridEvent[] events)
{
if (this.IsToRequireAuthentication())
{
ServiceUtility.RequestBackendUserAuthentication();
}
// TODO: provider name should be configurable
// TODO: get the manager only if an event that we are interested in is present in the events variable.
// Could be done with a property but I am not aware of the this object lifecycle at the moment.
// TODO: Ideally the whole data related operations like getting subscribers, campaigns and writing statistics
// should be in a separate component and not in the service itself.
var newslettersManager = NewslettersManager.GetManager();
var isToSaveChanges = false;
// TODO: Use dynamic objects and inspect them for the required properties instead of
// this strongly typed approach since the different events have very different properties
// and this hook should be able to handle all and not throw exceptions if an event that is
// not supported is received.
foreach (var sendGridEvent in events)
{
// TODO: rewrite this with chain of responsibility so that additional event handlers can be easily added.
if (this.IsToHanlde(sendGridEvent))
{
BounceStatus bounceStatus = this.ResolveStatus(sendGridEvent);
Campaign campaign;
Subscriber subscriber;
try
{
campaign = newslettersManager.GetCampaign(sendGridEvent.SitefinityCampaignId);
subscriber = newslettersManager.GetSubscriber(sendGridEvent.SitefinitySubscriberId);
}
catch (Telerik.Sitefinity.SitefinityExceptions.ItemNotFoundException)
{
// If the campaign or the subscriber is not found we skip to the next event.
break;
}
this.WriteStatistics(newslettersManager, campaign, subscriber, bounceStatus);
this.PerformBounceAction(newslettersManager, subscriber, bounceStatus);
isToSaveChanges = true;
}
}
if (isToSaveChanges)
{
newslettersManager.SaveChanges();
}
this.Response.StatusCode = (int)HttpStatusCode.OK;
}
private void PerformBounceAction(NewslettersManager newslettersManager, Subscriber subscriber, BounceStatus bounceStatus)
{
var bounceActionResolver = ObjectFactory.Resolve <BounceActionResolver>();
BounceAction bounceAction = bounceActionResolver.ResolveAction(bounceStatus);
bounceActionResolver.PerformAction(newslettersManager, subscriber.Id, bounceAction, false);
}
private void WriteStatistics(NewslettersManager newslettersManager, Campaign campaign, Subscriber subscriber, BounceStatus bounceStatus)
{
// TODO: check for indexes on the bounce status database table by campaign id and subscriber id.
var bounceStat = newslettersManager.GetBounceStats().Where(b => b.Campaign.Id == campaign.Id && b.Subscriber.Id == subscriber.Id).FirstOrDefault();
if (bounceStat == null)
{
bounceStat = newslettersManager.CreateBounceStat();
}
else
{
// If the bounce stat is already created, then the current bounce is caused by retry operation.
bounceStat.RetryCount++;
}
bounceStat.Campaign = campaign;
bounceStat.Subscriber = subscriber;
bounceStat.SmtpStatus = Enum.GetName(typeof(Telerik.Sitefinity.Newsletters.Model.MessageStatus), bounceStatus);
bounceStat.BounceStatus = bounceStatus;
bounceStat.IsProcessing = false;
}
private void WriteStatistics(NewslettersManager newslettersManager, Campaign campaign, Subscriber subscriber, BounceStatus bounceStatus)
{
// TODO: check for indexes on the bounce status database table by campaign id and subscriber id.
var bounceStat = newslettersManager.GetBounceStats().Where(b => b.Campaign.Id == campaign.Id && b.Subscriber.Id == subscriber.Id).FirstOrDefault();
if (bounceStat == null)
{
bounceStat = newslettersManager.CreateBounceStat();
}
else
{
// If the bounce stat is already created, then the current bounce is caused by retry operation.
bounceStat.RetryCount++;
}
bounceStat.Campaign = campaign;
bounceStat.Subscriber = subscriber;
bounceStat.SmtpStatus = Enum.GetName(typeof(Telerik.Sitefinity.Newsletters.Model.MessageStatus), bounceStatus);
bounceStat.BounceStatus = bounceStatus;
bounceStat.IsProcessing = false;
}
private void PerformBounceAction(NewslettersManager newslettersManager, Subscriber subscriber, BounceStatus bounceStatus)
{
var bounceActionResolver = ObjectFactory.Resolve<BounceActionResolver>();
BounceAction bounceAction = bounceActionResolver.ResolveAction(bounceStatus);
bounceActionResolver.PerformAction(newslettersManager, subscriber.Id, bounceAction, false);
}
