/// <summary>
/// Asynchronously sends an e-mail on behalf of the given controller using the specified parameters.
/// </summary>
/// <param name="controller">The controller that initiated the action.</param>
/// <param name="model">An object used to create the message to send.</param>
/// <param name="emailClient">An object used to send the e-mail.</param>
/// <returns></returns>
public static async Task <IActionResult> SendEmailAsync(this Controller controller, EmailModel model, IEmailClientService emailClient)
{
var config = emailClient.Configuration;
try
{
var message = EmailClientService.CreateMessage(
model.Subject,
model.Body,
model.From,
model.To
);
await emailClient.SendAsync(message);
return(controller.Ok());
}
catch (ServiceNotAuthenticatedException ex)
{
if (false == config?.RequiresAuth)
{
return(controller.BadRequest(new ServiceNotAuthenticatedException(SmtpServerRequiresAuth)));
}
return(controller.BadRequest(ex));
}
catch (SslHandshakeException ex)
{
if (true == config?.UseSsl)
{
return(controller.BadRequest(new SslHandshakeException(SmtpServerDoesNotSupportSsl)));
}
return(controller.BadRequest(ex));
}
catch (SocketException)
{
return(controller.BadRequest(new Exception(string.Format(SmtpHostUnreachable, config?.Host))));
}
catch (Exception ex)
{
return(controller.BadRequest(ex));
}
}
/// <summary>
/// Executes a long running task until cancellation is requested.
/// </summary>
/// <param name="cancellationToken">The token used to cancel an ongoing async operation.</param>
/// <returns></returns>
protected override async Task ExecuteAsync(CancellationToken cancellationToken)
{
if (Dispatching || Disabled)
{
return;
}
Dispatching = true;
CancellationTokenSource cts = null;
try
{
await RetrieveFailedEmails();
var unlogged = true;
var hubClients = _hubContext.Clients.All;
var messages = new HashSet <MimeMessage>();
cts = CreateLinkedTokenSource(cancellationToken);
foreach (var item in DequeueAll())
{
if (item is MimeMessageContainer container)
{
_workingSet.Add(container);
messages.Add(container.Message);
}
else
{
try
{
// broadcast notification message
await hubClients.BroadcastMessage(item);
}
catch (Exception ex)
{
if (unlogged)
{
Logger.LogWarning(ex, "Error broadcasting message to SignalR clients.");
unlogged = false;
}
}
}
if (cts.IsCancellationRequested)
{
break;
}
}
if (!cts.IsCancellationRequested && messages.Count > 0)
{
if (_emailClient.Configuration == null)
{
await SyncEmailSettings();
}
Logger.LogInformation("Dispatching e-mails...");
await _emailClient.SendAsync(messages, cts.Token);
Logger.LogInformation("Done dispatching e-mails.");
}
messages.Clear();
}
catch (Exception ex)
{
Logger.LogError(ex, "Something strange happened in the e-mail dispatcher.");
}
finally
{
_workingSet.Clear();
cts?.Dispose();
Dispatching = false;
}
}