public static void HandleSubscribe(Message message, TextWriter log)
{
string feedUrl = message.Body.FeedUrl;
string imageUri = message.Body.ImageUri;
string hash = Convert.ToBase64String(message.Hash.Code);
Guid userGuid = message.ObjectId;
using (var context = new CommuterDbContext())
{
Podcast podcast = context.Podcasts
.FirstOrDefault(p => p.FeedUrl == feedUrl);
if (podcast == null)
{
podcast = context.Podcasts.Add(new Podcast
{
FeedUrl = feedUrl,
ImageUri = imageUri
});
log.WriteLine($"Adding new podcast {feedUrl}.");
}
else
{
log.WriteLine($"Adding subscription for existing podcast {feedUrl}.");
}
context.Subscriptions.Add(new Subscription
{
Podcast = podcast,
UserGuid = userGuid,
Hash = hash
});
context.SaveChanges();
}
}
public static void HandleUnsubscribe(Message message, TextWriter log)
{
var hashes = message.GetPredecessors("Subscription")
.Select(p => Convert.ToBase64String(p.Code))
.ToList();
using (var context = new CommuterDbContext())
{
var predecessors = context.Subscriptions
.Where(s => hashes.Contains(s.Hash))
.ToList();
context.Subscriptions.RemoveRange(predecessors);
log.WriteLine($"Removing {predecessors.Count} podcast subscriptions");
context.SaveChanges();
}
}