public async Task ExecuteAsync(CancellationToken token)
{
DiscordChannel channel = Bot.Discord.Guilds[GuildId].GetChannel(ChannelId);
DiscordEmbedBuilder builder = new DiscordEmbedBuilder()
.WithAuthor("Reminder Hat")
.WithTitle(Name)
.WithDescription(Contents)
.WithColor(DiscordColor.HotPink)
.WithImageUrl("https://www.flaticon.com/svg/static/icons/svg/1792/1792931.svg");
await channel.SendMessageAsync(embed : builder.Build());
try
{
using (DevryDbContext database = new DevryDbContext())
{
this.NextRunTime = CrontabSchedule.Parse(Schedule).GetNextOccurrence(DateTime.Now);
database.Entry(this).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
await database.SaveChangesAsync();
}
}
catch (Exception ex)
{
Console.WriteLine($"Unable to update Reminder: {Id} | {Name} | {Schedule}\n\t{ex.Message}");
}
}
async Task initialize()
{
using (DevryDbContext context = new DevryDbContext())
{
foreach (var reminder in await context.Reminders.ToListAsync())
{
AddTask(reminder);
}
}
}
public DiscordService()
{
_context = new DevryDbContext();
}
private async Task ExecuteOnceAsync(CancellationToken token)
{
var taskFactory = new TaskFactory(TaskScheduler.Current);
// Cached since this will be referenced quite frequently in this method
var referenceTime = DateTime.Now;
// Determine which tasks will never run again and remove them from the database
var removeList = _scheduledTasks.Where(x => x.Value.WillNeverRunAgain).ToList();
// We must ensure that our database is updated -- to remove tasks that will never run again
using (DevryDbContext context = new DevryDbContext())
{
foreach (var pair in removeList)
{
Models.Reminder reminder = await context.Reminders.FindAsync(pair.Key);
if (reminder == null)
{
_logger.LogWarning($"Unable to locate reminder with Id: {pair.Key}");
continue;
}
else
{
_logger.LogInformation($"Reminder: '{reminder.Name}' with Id '{reminder.Id}' is being cleaned up. --Determined to never run again");
context.Reminders.Remove(reminder);
_scheduledTasks.Remove(pair.Key);
}
}
// Save changes (if applicable)
await context.SaveChangesAsync();
}
var tasksThatShouldRun = _scheduledTasks.Values.Where(x => x.ShouldRun(referenceTime));
foreach (var task in tasksThatShouldRun)
{
task.Increment();
await taskFactory.StartNew(
async() =>
{
try
{
await task.Task.ExecuteAsync(token);
}
catch (Exception ex)
{
var args = new UnobservedTaskExceptionEventArgs(ex as AggregateException ?? new AggregateException(ex));
UnobservedException?.Invoke(this, args);
if (!args.Observed)
{
throw;
}
}
},
token);
}
}
