/// <summary>
/// Returns the client.
/// </summary>
/// <param name="client">The client.</param>
/// <param name="traceProperties">The trace properties.</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
public async Task ReturnClient(IDSSmtpClient client, Dictionary <string, string> traceProperties)
{
if (traceProperties == null)
{
traceProperties = new Dictionary <string, string>();
}
if (client == null)
{
throw new ArgumentNullException(nameof(client));
}
traceProperties["Id"] = Guid.NewGuid().ToString();
await SemaphoreSlim.WaitAsync().ConfigureAwait(false);
try
{
if (currentClientCount <= MaxClientCount)
{
ClientList.Enqueue(client);
this.logger.TraceInformation("SmtpClient returned to pool.", traceProperties);
}
else
{
currentClientCount--;
client.Dispose();
this.logger.TraceInformation($"SmtpClient disposed. Current count: {currentClientCount}", traceProperties);
}
}
finally
{
_ = SemaphoreSlim.Release();
}
}
/// <summary>
/// Gets the client.
/// </summary>
/// <param name="traceProperties">The trace properties.</param>
/// <returns>
/// A <see cref="IDSSmtpClient" />.
/// </returns>
public async Task <IDSSmtpClient> GetClient(Dictionary <string, string> traceProperties)
{
if (traceProperties == null)
{
traceProperties = new Dictionary <string, string>();
}
traceProperties["Id"] = Guid.NewGuid().ToString();
IDSSmtpClient client = await this.TryGetClient(traceProperties, false).ConfigureAwait(false);
int numberOfTries = 1;
while (client == null)
{
if (numberOfTries > 5)
{
this.logger.WriteCustomEvent("TryGetClient exceeded max number of tries, overriding client creation.", traceProperties);
this.logger.WriteMetric("SmtpClientPool_OneTimeClientCreation", 1, traceProperties);
client = await this.TryGetClient(traceProperties, true).ConfigureAwait(false);
return(client);
}
else
{
this.logger.TraceInformation($"ClientPoolRequestFailure, number of tries: {numberOfTries}.", traceProperties);
this.logger.WriteMetric("SmtpClientPool_ClientPoolRequestFailure", 1, traceProperties);
await Task.Delay(1000 *numberOfTries).ConfigureAwait(false);
client = await this.TryGetClient(traceProperties, false).ConfigureAwait(false);
numberOfTries++;
}
}
return(client);
}
private async Task SendItemAsync(MimeMessage message, Dictionary <string, string> traceProps)
{
IDSSmtpClient client = null;
string status = "Fail";
DateTimeOffset startTime;
Stopwatch timer = new Stopwatch();
try
{
client = await this.clientPool.GetClient(traceProps).ConfigureAwait(false);
startTime = DateTimeOffset.Now;
timer.Start();
try
{
await client.SendAsync(message, traceProps).ConfigureAwait(false);
}
catch (ServiceNotConnectedException svcEx)
{
string description = $"SmtpClient not connected: {svcEx.Source}";
string eventMsg = "Closed connection, requesting new SmtpClient.";
this.logger.WriteException(svcEx, traceProps);
this.logger.TraceInformation(eventMsg, traceProps);
client.Refresh(traceProps);
await client.SendAsync(message, traceProps).ConfigureAwait(false);
}
catch (IOException ioex)
{
string description = $"No response from MX endpoint: {ioex.Source}";
string eventMsg = "Socket failure, requesting new SmtpClient.";
traceProps["Error Description"] = description;
this.logger.WriteException(ioex, traceProps);
this.logger.TraceInformation(eventMsg, traceProps);
client.Refresh(traceProps);
await client.SendAsync(message, traceProps).ConfigureAwait(false);
}
catch (SmtpCommandException ex)
{
this.logger.WriteException(ex, traceProps);
this.logger.TraceInformation($"SmtpCommandException with message {ex.Message} has been handled ", traceProps);
client.Refresh(traceProps);
await client.SendAsync(message, traceProps).ConfigureAwait(false);
}
catch (SocketException ex)
{
this.logger.WriteException(ex, traceProps);
this.logger.TraceInformation($"SocketException with message {ex.Message} has been handled ", traceProps);
client.Refresh(traceProps);
await client.SendAsync(message, traceProps).ConfigureAwait(false);
}
timer.Stop();
status = "Success";
}
catch (SmtpProtocolException ex)
{
this.logger.WriteException(ex, traceProps);
throw;
}
catch (SmtpCommandException ex)
{
string msg = string.Empty;
switch (ex.ErrorCode)
{
case SmtpErrorCode.RecipientNotAccepted:
msg = $"Recipient not accepted: {ex.Mailbox?.Address}";
break;
case SmtpErrorCode.SenderNotAccepted:
msg = $"Sender not accepted: {ex.Mailbox?.Address}";
break;
case SmtpErrorCode.MessageNotAccepted:
msg = "Message not accepted.";
break;
}
traceProps["ErrorMessage"] = msg;
this.logger.WriteException(ex, traceProps);
throw;
}
catch (Exception ex)
{
this.logger.WriteException(ex, traceProps);
throw;
}
finally
{
if (client != null)
{
await this.clientPool.ReturnClient(client, traceProps).ConfigureAwait(false);
}
traceProps["Status"] = status;
traceProps["EndPoint"] = this.clientPool.EndPoint;
var metrics = new Dictionary <string, double>
{
{ "Duration", timer.Elapsed.TotalMilliseconds },
};
this.logger.WriteCustomEvent("DirectSendMailService_SendMail", traceProps, metrics);
this.logger.WriteMetric("DirectSendMailService_SendMailCount", 1, traceProps);
}
}
/// <summary>
/// Creates the client.
/// </summary>
/// <param name="traceProperties">The trace properties.</param>
/// <returns>A <see cref="IDSSmtpClient"/>.</returns>
internal IDSSmtpClient CreateClient()
{
IDSSmtpClient emailClient = this.factory.CreateClient(this.config, this.logger);
return(emailClient);
}