private async Task SendEmails(IServiceScope scope, CancellationToken stoppingToken)
{
MailQueueDbContext dbContext = scope.ServiceProvider.GetRequiredService <MailQueueDbContext>();
MailSender mailSender = scope.ServiceProvider.GetRequiredService <MailSender>();
Expression <Func <Mail, bool> > query = mail => mail.Error == null && !mail.Success;
while (await dbContext.Mails.AnyAsync(query))
{
using IDbContextTransaction transaction = dbContext.Database.BeginTransaction();
Mail mailToSend = await dbContext.Mails.FirstAsync(query);
try
{
await mailSender.SendEmail(mailToSend.Content, new EmailContext(mailToSend));
mailToSend.Success = true;
mailToSend.Sent = DateTime.UtcNow;
}
catch (Exception e)
{
mailToSend.Error = e.Message;
}
await dbContext.SaveChangesAsync();
await transaction.CommitAsync();
}
}
public async Task SendEmail <T>(string template, T context) where T : EmailContext
{
string content = await this.templateEngine.Render <T>(template, context);
var newMail = new Mail
{
Id = Guid.NewGuid(),
To = context.To?.Address ?? "",
Subject = context.Subject,
Content = content,
Owner = EnvironmentUtils.GetMachineIdentifier(),
};
await mailQueueDbContext.Mails.AddAsync(newMail);
await mailQueueDbContext.SaveChangesAsync();
}