Email notification for LeafWeb jobs

Web/Services/EmailNotificationService.cs

@@ -0,0 +1,93 @@
+using System;
+using System.Configuration;
+using System.IO;
+using System.Linq;
+using System.Net.Mail;
+using LeafWeb.Core.DAL;
+using LeafWeb.Core.Entities;
+using NLog;
+
+namespace LeafWeb.Web.Services
+{
+	public class EmailNotificationService : IDisposable
+	{
+		private static readonly Logger Logger = LogManager.GetCurrentClassLogger();
+
+		private readonly string _emaialFromAddress;
+
+		private readonly SmtpClient _smtpClient;
+
+		private readonly DataService _dataService;
+
+		public EmailNotificationService(DataService dataService)
+		{
+			_dataService = dataService;
+
+			_smtpClient = new SmtpClient();
+
+			_emaialFromAddress = ConfigurationManager.AppSettings["EmailFromAddress"];
+		}
+
+		public EmailNotificationService() : this(new DataService())
+		{ }
+
+		public void SendLeafWebError(int leafWebFileId, string errorMessage)
+		{
+			var file = _dataService.GetLeafInputFile(leafWebFileId);
+			var body = $"Your LeafWeb analysis job, {file.LeafInput.Identifier} (with filename {file.Filename}), encountered the following errors." + Environment.NewLine
+				+ "You will need to correct your input and resubmit." + Environment.NewLine + Environment.NewLine
+				+ errorMessage;
+			var message = new MailMessage(_emaialFromAddress, file.LeafInput.Email, "LeafWeb processing error", body);
+			SendMessage(message);
+		}
+
+		public void SendLeafWebSuccess(int leafWebFileId)
+		{
+			var file = _dataService.GetLeafInputFile(leafWebFileId);
+			var body = $"Your LeafWeb analysis job, {file.LeafInput.Identifier} (with filename {file.Filename}), has completed." + Environment.NewLine;
+			var message = new MailMessage(_emaialFromAddress, file.LeafInput.Email, "LeafWeb results", body);
+
+			var fileStreams =
+				(from outputFile in
+					file.LeafOutputFiles
+					select Tuple.Create(outputFile, new MemoryStream(outputFile.Contents))).ToList();
+
+			try
+			{
+				foreach (var fileStream in fileStreams)
+				{
+					var attachment = new Attachment(fileStream.Item2, fileStream.Item1.Filename);
+					message.Attachments.Add(attachment);
+				}
+
+				SendMessage(message);
+			}
+			finally
+			{
+				// can't dispose those memory streams until the message is sent
+				foreach (var stream in fileStreams.Select(f => f.Item2))
+				{
+					stream.Dispose();
+				}
+			}
+		}
+
+		private void SendMessage(MailMessage mailMessage)
+		{
+			try
+			{
+				Logger.Debug("Email sending to " + mailMessage.To + ", subject: " + mailMessage.Subject);
+				_smtpClient.Send(mailMessage);
+			}
+			catch (SmtpException ex)
+			{
+				Logger.Error(ex, "Failed to send mail: {0}", ex.Message);
+			}
+		}
+
+		public void Dispose()
+		{
+			_dataService.Dispose();
+		}
+	}
+}

Web/Services/PiscalQueueManager.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Linq;
 using System.Threading;
+using Hangfire;
 using LeafWeb.Core.DAL;
 using LeafWeb.Core.Entities;
 using LeafWeb.Core.Remote;
@@ -12,14 +13,16 @@ namespace LeafWeb.Web.Services
 	{
 		private readonly DataService _dataService;
 		private readonly PiscalService _piscalService;
+		private readonly EmailNotificationService _emailService;
 
-		public PiscalQueueManager(DataService dataService, PiscalService piscalService)
+		public PiscalQueueManager(DataService dataService, PiscalService piscalService, EmailNotificationService emailService)
 		{
 			_dataService = dataService;
 			_piscalService = piscalService;
+			_emailService = emailService;
 		}
 
-		public PiscalQueueManager() : this(new DataService(), new PiscalService()) {}
+		public PiscalQueueManager() : this(new DataService(), new PiscalService(), new EmailNotificationService()) {}
 
 		private static readonly object ProcessQueueLock = new object();
 
@@ -109,6 +112,8 @@ namespace LeafWeb.Web.Services
 							// update db
 							_dataService.SetLeafInputFileStatus(file, LeafInputStatusType.Complete);
 
+							BackgroundJob.Enqueue(() => _emailService.SendLeafWebSuccess(file.Id));
+
 							// remove working data from the server
 							logger.Info("LeafInputFile: {0}, Cleanup", file.Id);
 							_piscalService.Cleanup(file);
@@ -127,6 +132,12 @@ namespace LeafWeb.Web.Services
 							logger.Info("LeafInputFile: {0}, Error Message: {1}", file.Id, errorMessage);
 
 							_dataService.SetLeafInputFileStatus(file, LeafInputStatusType.Error, errorMessage);
+
+							BackgroundJob.Enqueue(() => _emailService.SendLeafWebError(file.Id, errorMessage));
+
+							// remove working data from the server
+							logger.Info("LeafInputFile: {0}, Cleanup", file.Id);
+							_piscalService.Cleanup(file);
 							break;
 					}
 				}