Merge branch 'master' of git.starbeamrainbowlabs.com:sbrl/RhinoReminds

README.md

@@ -2,7 +2,14 @@
 
 > An XMPP reminder bot written in C#.
 
+
 ## Getting Started
+
+### Downloading Prebuilt Binaries
+Prebuilt binaries for the latest release are available on the [releases page](https://git.starbeamrainbowlabs.com/sbrl/RhinoReminds/releases).
+
+### Building from Source
+
 1. Install the NuGet dependencies:
 
 ```bash
@@ -32,6 +39,7 @@ mono [--debug] RhinoReminds.exe [--help]
 RhinoReminds.exe [--help]
 ```
 
+
 ## Usage
 The bot operates on natural language instructions. It picks what to do from the first word in the sentence, but the rest is parsed via AI.
 
@@ -52,6 +60,25 @@ Show all
 List all
 ```
 
+### Deleting Reminders
+
+```
+Delete reminder 43
+Delete #22, #23, and #45
+Delete number eight
+Delete reminders 2, 3, 4, and 7
+```
+
+
+## Contributing
+Contributions are welcome! Bug reports can be opened against this repository if you have an account. Otherwise, send them to `bugs at starbeamrainbowlabs dot com`.
+
+Pull requests and patches are welcome too. [Here's a great tutorial](https://makandracards.com/makandra/2521-git-how-to-create-and-apply-patches) on creating patches. If there's any interest, I'll move this repository to my account on [gitlab.com](https://gitlab.com/sbrl) if that makes things easier.
+
+
+## License
+RhinoReminds is licensed under the _Mozilla Public License 2.0_ (MPL-2.0 for short) - the full text of which can be found in the [LICENSE](https://git.starbeamrainbowlabs.com/sbrl/RhinoReminds/src/branch/master/LICENSE) file in this repository. tl;drLegal have a [great summary](https://tldrlegal.com/license/mozilla-public-license-2.0-(mpl-2)) if you don't want to spend all day read dry legalese :P
+
 
 ## Useful Links
  - [Microsoft.Text.Recognizers Samples](https://github.com/Microsoft/Recognizers-Text/tree/master/.NET/Samples)

RhinoReminds/ClientListener.cs

@@ -9,45 +9,49 @@ using System.Threading;
 using System.Threading.Tasks;
 using RhinoReminds.Utilities;
 using S22.Xmpp;
-using S22.Xmpp.Client;
 using S22.Xmpp.Im;
 using SBRL.Geometry;
 
 namespace RhinoReminds
 {
+	public class OnConnectedEventArgs : EventArgs { }
+	public delegate void OnConnectedHandler(object sender, OnConnectedEventArgs eventArgs);
+
 	public class ClientListener
 	{
 		public bool Debug { get; set; } = false;
 
-		public readonly string Jid;
+		public event OnConnectedHandler OnConnected;
-		public string Username => Jid.Split('@')[0];
+
-		public string Hostname => Jid.Split('@')[1];
+		public readonly Jid Jid;
+		public string Username => Jid.Node;
+		public string Hostname => Jid.Domain;
 		private readonly string password;
 
 		public readonly List<string> AllowedDomains = new List<string>();
 
 		public string ReminderFilePath { get; set; } = "./reminders.xml";
 		private ReminderList reminderList = new ReminderList();
+		private CancellationTokenSource reminderWatcherReset;
+		private CancellationToken reminderWatcherResetToken => reminderWatcherReset.Token;
 
-
+		private SimpleXmppClient client;
-		private XmppClient client;
 		/// <summary>
-		/// The number of seconds to wait before trying to reconnect to the 
+		/// The initial number of seconds to wait before trying to reconnect to the 
 		/// server again if we loose our connection again.
 		/// </summary>
-		private int nextBackoffDelay = 1;
+		private readonly int defaultBackoffDelay = 1;
-		private int defaultBackoffDelay = 1;
+		private readonly float backoffDelayMultiplier = 2;
-		private float backoffDelayMultiplier = 2;
 		/// <summary>
 		/// If a connection attempt doesn't succeed in this number of seconds,
 		/// give up and try again later.
 		/// </summary>
-		private int giveUpTimeout = 30;
+		private readonly int giveUpTimeout = 30;
 
 
 		public ClientListener(string inJid, string inPassword)
 		{
-			Jid = inJid;
+			Jid = new Jid(inJid);
 			password = inPassword;
 		}
 
@@ -59,26 +63,48 @@ namespace RhinoReminds
 				reminderList = ReminderList.FromXmlFile(ReminderFilePath);
 			}
 
-			client = new XmppClient(Hostname, Username, password);
-			client.Error += errorHandler;
-			client.Message += messageHandlerRoot;
-			client.SubscriptionRequest += subscriptionRequestHandler;
-
 			// Connect to the server. This starts it's own thread that doesn't block the program exiting, apparently
 			await connect();
 
-			//client.SetStatus(Availability.Online);
+			client.SetStatus(Availability.Online);
 
 			await watchForReminders();
 		}
 
+		private async Task reconnect()
+		{
+			// 1: Ensure we're disconnected from the server.
+			disconnect();
+
+			float nextBackoffDelay = defaultBackoffDelay;
+
+			do {
+				nextBackoffDelay *= backoffDelayMultiplier;
+
+				Console.Error.WriteLine($"[Rhino/Reconnect] Reconnecting in {TimeSpan.FromSeconds(nextBackoffDelay).ToString()}.");
+				Thread.Sleep((int)(nextBackoffDelay * 1000));
+				Console.WriteLine("[Rhino/Reconnect] Attempting to reconnect to the server");
+			} while (!await connect());
+		}
+
 		private async Task<bool> connect()
 		{
-			if (client.Connected)
+			if (client != null) {
+				if (client.Connected) {
 					return true;
+				} else {
+					client.Dispose();
+					client = null;
+				}
+			}
 
 			DateTime startTime = DateTime.Now;
-			client.Connect();
+			client = new SimpleXmppClient(Jid, password);
+			client.Error += errorHandler;
+			client.Message += messageHandlerRoot;
+			client.SubscriptionRequest += subscriptionRequestHandler;
+
+			client.Connect("RhinoReminds");
 
 			while (!client.Connected)
 			{
@@ -89,16 +115,25 @@ namespace RhinoReminds
 			}
 
 			Console.WriteLine($"[Rhino/Setup] Connected as {Jid}");
+			OnConnected(this, new OnConnectedEventArgs());
 
 			return true;
 		}
 
+		private void disconnect()
+		{
+			client.Close();
+			client.Dispose();
+			client = null;
+			Console.WriteLine($"[Rhino] Disconnected from server.");
+		}
+
 		#region XMPP Event Handling
 
 		private bool subscriptionRequestHandler(Jid from)
 		{
 			if (!AllowedDomains.Contains("*") && !AllowedDomains.Contains(from.Domain)) {
-				sendChatMessage(from, "Sorry! The domain of your JID doesn't match the ones in my allowed list.");
+				client.SendChatMessage(from, "Sorry! The domain of your JID doesn't match the ones in my allowed list.");
 				return false;
 			}
 			Console.WriteLine($"[Rhino/SubscriptionRequest] Approving subscription from {from}");
@@ -109,17 +144,8 @@ namespace RhinoReminds
 		{
 			Console.Error.WriteLine($"[Error] {e.Reason}: {e.Exception}");
 
-			if(!client.Connected)
+			if(!client.Connected || e.Exception is IOException) {
-			{
+				reconnect().Wait();
-				Console.Error.WriteLine($"[Error/Handler] Reconnecting in {TimeSpan.FromSeconds(nextBackoffDelay).ToString()}.");
-				Thread.Sleep(nextBackoffDelay * 1000);
-				Console.WriteLine("[Error/Handler] Attempting to reconnect to the server");
-
-				if (!connect().Result)
-					nextBackoffDelay = (int)Math.Ceiling(nextBackoffDelay * backoffDelayMultiplier);
-				else
-					nextBackoffDelay = defaultBackoffDelay;
-
 			}
 		}
 
@@ -134,8 +160,8 @@ namespace RhinoReminds
 			catch (Exception error)
 			{
 				Console.Error.WriteLine(error);
-				sendChatReply(eventArgs.Message, "Oops! I encountered an error. Please report this to my operator!");
+				client.SendChatReply(eventArgs.Message, "Oops! I encountered an error. Please report this to my operator!");
-				sendChatReply(eventArgs.Message, $"Technical details: {WebUtility.HtmlEncode(error.ToString())} (stack trace available in server log) ");
+				client.SendChatReply(eventArgs.Message, $"Technical details: {WebUtility.HtmlEncode(error.ToString())} (stack trace available in server log) ");
 
 			}
 		}
@@ -154,7 +180,7 @@ namespace RhinoReminds
 		private void messageHandler(Message message)
 		{
 			if (!AllowedDomains.Contains("*") && !AllowedDomains.Contains(message.From.Domain)) {
-				sendChatMessage(message.From, "Sorry! The domain of your JID doesn't match the ones in my allowed list.");
+				client.SendChatMessage(message.From, "Sorry! The domain of your JID doesn't match the ones in my allowed list.");
 				return;
 			}
 
@@ -166,15 +192,15 @@ namespace RhinoReminds
 			switch (parts[0].ToLower())
 			{
 				case "help":
-					sendChatReply(message, "Hello! I'm a reminder bot written by Starbeamrainbowlabs.");
+					client.SendChatReply(message, "Hello! I'm a reminder bot written by Starbeamrainbowlabs.");
-					sendChatReply(message, "I can understand messages you send me in regular english.");
+					client.SendChatReply(message, "I can understand messages you send me in regular english.");
-					sendChatReply(message, "I figure out what you want me to do by looking at the " +
+					client.SendChatReply(message, "I figure out what you want me to do by looking at the " +
 					              "first word you say, and how you want me to do it by using my AI.");
-					sendChatReply(message, "I currently understand the following instructions:\n");
+					client.SendChatReply(message, "I currently understand the following instructions:\n");
-					sendChatReply(message, "**Remind:** Set a reminder");
+					client.SendChatReply(message, "**Remind:** Set a reminder");
-					sendChatReply(message, "**List / Show:** List the reminders I have set");
+					client.SendChatReply(message, "**List / Show:** List the reminders I have set");
-					sendChatReply(message, "**Delete / Remove:** Delete a reminder by it's number (find this in the reminder list from the instruction above)");
+					client.SendChatReply(message, "**Delete / Remove:** Delete a reminder by it's number (find this in the reminder list from the instruction above)");
-					sendChatReply(message, "\nExample: 'Remind me to feed the cat tomorrow at 6pm'");
+					client.SendChatReply(message, "\nExample: 'Remind me to feed the cat tomorrow at 6pm'");
 					break;
 
 				case "delete":
@@ -195,19 +221,21 @@ namespace RhinoReminds
 					if (failed.Count > 0) {
 						string response = string.Join(", ", failed.Select((int nextId) => $"#{nextId}"));
 						response = $"Sorry! I can't delete reminder{(failed.Count != 1 ? "s" : "")} {response}, as you didn't create {(failed.Count != 1 ? "them":"it")}.";
-						sendChatReply(message, response);
+						client.SendChatReply(message, response);
 					}
 					if (succeeded.Count > 0) {
+						// Ensure that the reminder thread picks up the changes
+						interruptReminderWatcher();
 						string response = string.Join(", ", succeeded.Select((int nextId) => $"#{nextId}"));
 						response = $"Deleted reminder{(succeeded.Count != 1 ? "s" : "")} {response} successfully.";
-						sendChatReply(message, response);
+						client.SendChatReply(message, response);
 					}
 					break;
 
 				case "list":
 				case "show":
 					// Filter by reminders for this user.
-					IEnumerable<Reminder> userReminderList = reminderList.Reminders.Values.Where(
+					IEnumerable<Reminder> userReminderList = reminderList.Reminders.Where(
 						(Reminder next) => message.From.GetBareJid() == next.JidObj.GetBareJid()
 					);
 					StringBuilder listMessage = new StringBuilder("I've got the following reminders on my list:\n");
@@ -216,7 +244,7 @@ namespace RhinoReminds
 					}
 					listMessage.AppendLine();
 					listMessage.AppendLine($"({userReminderList.Count()} total)");
-					sendChatReply(message, listMessage.ToString());
+					client.SendChatReply(message, listMessage.ToString());
 
 					break;
 
@@ -225,8 +253,8 @@ namespace RhinoReminds
 					try {
 						dateTime = AIRecogniser.RecogniseDateTime(messageText, out rawDateTimeString);
 					} catch (AIException error) {
-						sendChatReply(message, "Sorry, I had trouble figuring out when you wanted reminding about that!");
+						client.SendChatReply(message, "Sorry, I had trouble figuring out when you wanted reminding about that!");
-						sendChatReply(message, $"(Technical details: {error.Message})");
+						client.SendChatReply(message, $"(Technical details: {error.Message})");
 						return;
 					}
 					Range dateStringLocation = new Range(
@@ -239,70 +267,63 @@ namespace RhinoReminds
 						@"^remind\s+(?:me\s+)?",
 						@"^me\s+",
 						@"^on\s+",
-						@"my",
 						@"you",
 						@"your",
+						@"my",
 						@"&" // Ampersands cause a crash when sending!
 					}, new string[] {
 						" ",
 						"",
 						"",
 						"",
-						"your",
 						@"me",
 						@"my",
+						"your",
 						@"and"
 					}, RegexOptions.IgnoreCase).Trim();
 
-					sendChatReply(message, $"Ok! I'll remind you {reminder} at {dateTime}.");
 
 					Reminder newReminder = reminderList.CreateReminder(message.From, dateTime, reminder);
+					if (newReminder == null) {
+						client.SendChatReply(
+							message,
+							"Oops! It looks like you've already got a reminder idential "
+							+ "to that one set, so I wasn't able to set a reminder for you. Please contact my "
+							+ "operator, as this is probably a bug."
+						);
+						break;
+					}
+
+					client.SendChatReply(message, $"Ok! I'll remind you {reminder} at {dateTime}.");
 					reminderList.Save(ReminderFilePath);
 					break;
 
 				default:
-					sendChatReply(message, "I don't understand that. Try rephrasing it or asking for help.");
+					client.SendChatReply(message, "I don't understand that. Try rephrasing it or asking for help.");
 					break;
 			}
 		}
 
 
 		#region Outgoing
-		/// <summary>
-		/// Sends a chat message to the specified JID.
-		/// </summary>
-		/// <param name="to">The JID to send the message to.</param>
-		/// <param name="message">The messaage to send.</param>
-		private void sendChatMessage(Jid to, string message) {
-			//Console.WriteLine($"[Rhino/Send/Chat] Sending {message} -> {to}");
-			client.SendMessage(
-				to, message,
-				null, null, MessageType.Chat
-			);
-		}
-		/// <summary>
-		/// Sends a chat message in direct reply to a given incoming message.
-		/// </summary>
-		/// <param name="originalMessage">Original message.</param>
-		/// <param name="reply">Reply.</param>
-		private void sendChatReply(Message originalMessage, string reply)
-		{
-			//Console.WriteLine($"[Rhino/Send/Reply] Sending {reply} -> {originalMessage.From}");
-			client.SendMessage(
-				originalMessage.From, reply,
-				null, originalMessage.Thread, MessageType.Chat
-			);
-		}
 
 		#endregion
 
 		#region Reminder Listening
 
+		private void interruptReminderWatcher()
+		{
+			reminderWatcherReset?.Cancel();
+			reminderWatcherReset = new CancellationTokenSource();
+		}
+
 		private async Task watchForReminders()
 		{
-			CancellationTokenSource cancellationSource = new CancellationTokenSource();
+			interruptReminderWatcher();
-			CancellationToken cancellationToken = cancellationSource.Token;
 			Reminder nextReminder = reminderList.GetNextReminder();
+
+			// ----- Events -----
+			// This will run on the firing thread, not on this thread
 			reminderList.OnReminderListUpdate += (object sender, Reminder newReminder) => {
 				Reminder newNextReminder = reminderList.GetNextReminder();
 				//Console.WriteLine("[Rhino/Reminderd/Canceller] Reminder added - comparing.");
@@ -310,63 +331,74 @@ namespace RhinoReminds
 				if (nextReminder != newNextReminder) {
 					//Console.WriteLine($"[Rhino/Reminderd/Canceller] Cancelling");
 					nextReminder = newNextReminder;
-					cancellationSource.Cancel();
+					interruptReminderWatcher();
 				}
 			};
+			// ------------------
 
-			while (true)
+			while (true) {
-			{
+				nextReminder = reminderList.GetNextReminder();
+				// Wait for the next reminder
 				TimeSpan nextWaitingTime;
 				try {
 					if (nextReminder != null) {
 						nextWaitingTime = nextReminder.Time - DateTime.Now;
-						if (DateTime.Now < nextReminder.Time) {
+						if (DateTime.Now < nextReminder.Time)
+						{
 							//Console.WriteLine($"[Rhino/Reminderd] Sleeping for {nextWaitingTime}");
-							await Task.Delay(nextWaitingTime, cancellationToken);
+							await Task.Delay(nextWaitingTime, reminderWatcherResetToken);
 						}
-					} else {
+					}
+					else {
 						//Console.WriteLine("[Rhino/Reminderd] Sleeping until interrupted");
-						await Task.Delay(Timeout.Infinite, cancellationToken);
+						await Task.Delay(Timeout.Infinite, reminderWatcherResetToken);
 					}
-				} catch (TaskCanceledException) {
+				}
+				catch (TaskCanceledException)
+				{
 					//Console.WriteLine("[Rhino/Reminderd] Sleep interrupted, recalculating");
-					cancellationSource = new CancellationTokenSource();
+					interruptReminderWatcher();
-					cancellationToken = cancellationSource.Token;
 					continue;
 				}
 
-				if (cancellationToken.IsCancellationRequested) {
+				if (reminderWatcherResetToken.IsCancellationRequested)
+				{
 					Console.WriteLine("[Rhino/Reminderd] Sleep interrupted, recalculating (but no exception thrown)");
-					cancellationSource = new CancellationTokenSource();
+					interruptReminderWatcher();
-					cancellationToken = cancellationSource.Token;
-
 					continue;
 				}
 
 				Console.WriteLine($"[Rhino/Reminderd] Sending notification {nextReminder}");
+				sendAndDeleteReminder(nextReminder);
 
-				try
-				{
-					sendChatMessage(
-						nextReminder.Jid,
-						$"Hello! You asked me to remind you {nextReminder.Message} at {nextReminder.Time}.".Trim().Replace(@"\s+", " ")
-					);
-				} catch (Exception error) {
-					Console.Error.WriteLine($"[Rhino/Reminderd] Caught error sending message to client: {error}");
-					Console.Error.WriteLine($"[Rhink/Reminderd] Offending reminder: {nextReminder}");
-					sendChatMessage(nextReminder.Jid, "Oops! I encountered an error sending you a reminder. Please contact my operator!");
-				}
 				if (nextWaitingTime.TotalMilliseconds < 0) {
-					sendChatMessage(
+					client.SendChatMessage(
 						nextReminder.Jid,
 						"(Sorry I'm late reminding you! I might not have been running at the time, " +
 						"or you might have scheduled a reminder for the past)"
 					);
 				}
+			}
+		}
+
+		private void sendAndDeleteReminder(Reminder nextReminder)
+		{
+			try
+			{
+				client.SendChatMessage(
+					nextReminder.Jid,
+					$"Hello! You asked me to remind you {nextReminder.Message} at {nextReminder.Time}.".Trim().Replace(@"\s+", " ")
+				);
+			}
+			catch (Exception error)
+			{
+				Console.Error.WriteLine($"[Rhino/Reminderd] Caught error sending message to client: {error}");
+				Console.Error.WriteLine($"[Rhink/Reminderd] Offending reminder: {nextReminder}");
+				client.SendChatMessage(nextReminder.Jid, "Oops! I encountered an error sending you a reminder. Please contact my operator!");
+			}
+
 			reminderList.DeleteReminder(nextReminder);
 			reminderList.Save(ReminderFilePath);
-				nextReminder = reminderList.GetNextReminder();
-			}
 		}
 
 		#endregion

RhinoReminds/CompareReminders.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+
+namespace RhinoReminds
+{
+	public class CompareReminders : IComparer<Reminder>
+	{
+		public CompareReminders()
+		{
+		}
+
+		public int Compare(Reminder x, Reminder y)
+		{
+			return (int)(x.Time - y.Time).TotalMilliseconds;
+		}
+	}
+}

RhinoReminds/Program.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Threading.Tasks;
 using S22.Xmpp;
@@ -15,6 +16,7 @@ namespace RhinoReminds
 		public string Jid = null;
 
 		public string AvatarFilepath = string.Empty;
+		public string PidFile = null;
 
 		public string Password = null;
 	}
@@ -48,6 +50,7 @@ namespace RhinoReminds
 						Console.WriteLine($"    -f  --file    Specify where to save reminders (default: {settings.Filepath})");
 						Console.WriteLine("        --domain {domain}  Set the domain users are allowed to originate at. Defaults to any domain.");
 						Console.WriteLine("        --avatar  Update the XMPP account's avatar to the specified image. By default the avatar is not updated.");
+						Console.WriteLine("        --pidfile Save our process ID to the specified file, and delete it on exit");
 						Console.WriteLine();
 						Console.WriteLine("Environment Variables:");
 						Console.WriteLine("    XMPP_JID       The JID to login to");
@@ -67,30 +70,84 @@ namespace RhinoReminds
 					case "--avatar":
 						settings.AvatarFilepath = args[++i];
 						break;
+
+					case "--pidfile":
+						settings.PidFile = args[++i];
+						break;
+
+					default:
+						Console.Error.WriteLine($"Error: Unknown argument '{args[i]}'.");
+						return 14;
 				}
 			}
 
 			settings.Jid = Environment.GetEnvironmentVariable("XMPP_JID");
 			settings.Password = Environment.GetEnvironmentVariable("XMPP_PASSWORD");
 
-			Run();
+			if (settings.Jid == null) {
+				Console.Error.WriteLine("Error: No JID specified to login with."); 
+				Console.Error.WriteLine("Do so with the XMPP_JID environment variable!");
+				return 15;
+			}
+			if (settings.Password == null) {
+				Console.Error.WriteLine("Error: No password specified to login with.");
+				Console.Error.WriteLine("Do so with the XMPP_PASSWORD environment variable!");
+				return 16;
+			}
 
+			if (settings.PidFile != null)
+				setupPidFile();
+
+			run();
+			// We shouldn't ever end up here, but just in case.....
+			cleanupPidFile();
 			return 0;
 		}
 
-		public static void Run()
+		private static void setupPidFile()
+		{
+			File.WriteAllText(settings.PidFile, Process.GetCurrentProcess().Id.ToString());
+			AppDomain.CurrentDomain.ProcessExit += (object sender, EventArgs e) => cleanupPidFile();
+			AppDomain.CurrentDomain.DomainUnload += (object sender, EventArgs e) => cleanupPidFile();
+		}
+
+		private static void cleanupPidFile() {
+			// Make sure we only do cleanup once
+			if (settings.PidFile == null)
+				return;
+
+			File.Delete(settings.PidFile);
+			settings.PidFile = null;
+		}
+
+		private static void run()
 		{
 			ClientListener client = new ClientListener(settings.Jid, settings.Password) {
 				ReminderFilePath = settings.Filepath
 			};
 			client.AllowedDomains.Add(settings.AllowedDomain);
-			// Connect to the server & start listening
-			Task clientListener = client.Start();
 			// Update the avatar if appropriate
-			if(settings.AvatarFilepath != string.Empty)
+			if (settings.AvatarFilepath != string.Empty) {
+				OnConnectedHandler handler = null;
+				handler = (object sender, OnConnectedEventArgs eventArgs) => {
 					client.SetAvatar(settings.AvatarFilepath);
+					Console.WriteLine($"[Program] Set avatar to '{settings.AvatarFilepath}'.");
+					client.OnConnected -= handler;
+				};
+				client.OnConnected += handler;
+			}
+			// Connect to the server & start listening
 			// Make sure the program doesn't exit whilst we're connected
-			clientListener.Wait();
+			try
+			{
+				client.Start().Wait();
+			} catch (Exception) {
+				// Ensure we tidy up after ourselves by deleting the PID file
+				if (settings.PidFile != null)
+					cleanupPidFile();
+				// Re-throw the error
+				throw;
+			}
 		}
 	}
 }

RhinoReminds/Reminder.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Net;
 using System.Xml;
 using S22.Xmpp;
@@ -6,29 +7,59 @@ using S22.Xmpp;
 namespace RhinoReminds
 {
 
-	public class Reminder
+	public class Reminder : IEquatable<Reminder>
 	{
 		public int Id { get; }
-		public string Jid { get; }
+		public string Jid => JidObj.ToString();
-		public Jid JidObj => new Jid(Jid);
+		public Jid JidObj { get; }
-		public DateTime Time { get; }
+		public DateTime Time { get; private set; }
 		public string Message { get; }
 
-		public Reminder(int inId, string inJid, DateTime inTime, string inMessage)
+		public Reminder(int inId, Jid inJid, DateTime inTime, string inMessage)
 		{
 			Id = inId;
-			Jid = inJid;
+			JidObj = inJid.GetBareJid();
 			Time = inTime;
 			Message = inMessage;
 		}
 
-		public override string ToString()
+		public void TweakTime() {
-		{
+			Time = Time.AddMilliseconds(1);
-			return $"[Reminder Id={Id}, Jid={Jid}, Time={Time}, Message={Message}";
 		}
 
-		#region XML
 
+		#region Overrides
+
+		public override bool Equals(object obj) {
+			if (!(obj is Reminder)) return false;
+			Reminder otherReminder = obj as Reminder;
+			return otherReminder.Id == Id &&
+				otherReminder.JidObj == JidObj && // Will *always* be a bare Jid
+				otherReminder.Time == Time &&
+				otherReminder.Message == Message;
+		}
+		// For IEquatable<Reminder> implementation
+		public bool Equals(Reminder otherReminder) => Equals((object)otherReminder);
+
+		public override int GetHashCode() {
+			int hashCode = -81903051;
+			hashCode = (hashCode * -1521134295) + Id.GetHashCode();
+			hashCode = (hashCode * -1521134295) + EqualityComparer<Jid>.Default.GetHashCode(JidObj);
+			hashCode = (hashCode * -1521134295) + Time.GetHashCode();
+			hashCode = (hashCode * -1521134295) + EqualityComparer<string>.Default.GetHashCode(Message);
+			return hashCode;
+		}
+		public static bool operator ==(Reminder reminder1, Reminder reminder2) => EqualityComparer<Reminder>.Default.Equals(reminder1, reminder2);
+		public static bool operator !=(Reminder reminder1, Reminder reminder2) => !(reminder1 == reminder2);
+
+		public override string ToString() {
+			return $"[Reminder Id={Id}, Jid={Jid}, Time={Time}, Message=\"{Message}\"]";
+		}
+
+		#endregion
+
+
+		#region XML
 
 		public void WriteToXml(XmlWriter xml)
 		{
@@ -66,7 +97,8 @@ namespace RhinoReminds
 			return new Reminder(id, jid, dateTime, message);
 		}
 
-
 		#endregion
+
+
 	}
 }

RhinoReminds/ReminderList.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 using System.Xml;
 using S22.Xmpp;
@@ -14,7 +13,7 @@ namespace RhinoReminds
 		private int nextId = 0;
 		private readonly object saveLock = new object();
 
-		public SortedList<DateTime, Reminder> Reminders = new SortedList<DateTime, Reminder>();
+		public SortedSet<Reminder> Reminders = new SortedSet<Reminder>(new CompareReminders());
 
 		public event OnReminderListUpdateHandler OnReminderListUpdate;
 
@@ -29,29 +28,28 @@ namespace RhinoReminds
 		{
 			Reminder result = new Reminder(nextId++, $"{inJid.Node}@{inJid.Domain}", time, message);
 			Console.WriteLine($"[Rhino/ReminderList] Created reminder {result}");
-			while (Reminders.ContainsKey(time))
+			while (Reminders.Contains(result))
-				time = time.AddMilliseconds(1);
+				result.TweakTime();
-			Reminders.Add(time, result);
+
+			Reminders.Add(result);
 			OnReminderListUpdate(this, result);
 			return result;
 		}
 
-		public Reminder GetNextReminder()
+		public Reminder GetNextReminder() {
-		{
 			if (Reminders.Count == 0)
 				return null;
 
-			return Reminders.Values[0];
+			return Reminders.Min;
 		}
 
-		public Reminder GetById(int targetId)
+		public Reminder GetById(int targetId) {
-		{
+			return Reminders.First((Reminder nextReminder) => nextReminder.Id == targetId);
-			return Reminders.First((KeyValuePair<DateTime, Reminder> nextPair) => nextPair.Value.Id == targetId).Value;
 		}
 
-		public void DeleteReminder(Reminder nextReminder)
+		public void DeleteReminder(Reminder nextReminder) {
-		{
+			if (!Reminders.Remove(nextReminder))
-			Reminders.Remove(nextReminder.Time);
+				throw new ApplicationException($"Error: Failed to remove the reminder {nextReminder} from the list!");
 		}
 
 
@@ -62,7 +60,7 @@ namespace RhinoReminds
 			// Make sure that the reminder thread doesn't try to save the reminders at the exact same time
 			// we receive a request for a new reminder
 			lock (saveLock)
-			{ // FUTURE: We could go lockless here with some work, but it's not worth it for the teeny chance & low overhead 
+			{ // FUTURE: We could go lockless here with some work, but it's not worth it for the teensy chance & low overhead 
 				XmlWriter xml = XmlWriter.Create(
 					filename,
 					new XmlWriterSettings() { Indent = true }
@@ -74,7 +72,7 @@ namespace RhinoReminds
 				xml.WriteElementString("NextId", nextId.ToString());
 
 				xml.WriteStartElement("Reminders");
-				foreach (Reminder nextReminder in Reminders.Values)
+				foreach (Reminder nextReminder in Reminders)
 					nextReminder.WriteToXml(xml);
 				xml.WriteEndElement();
 
@@ -89,15 +87,15 @@ namespace RhinoReminds
 			XmlDocument xml = new XmlDocument();
 			xml.Load(filepath);
 
-			ReminderList result = new ReminderList();
+			ReminderList result = new ReminderList() {
-			result.nextId = int.Parse(xml.GetElementsByTagName("NextId")[0].InnerText);
+				nextId = int.Parse(xml.GetElementsByTagName("NextId")[0].InnerText)
-			foreach (XmlNode reminderXML in xml.GetElementsByTagName("Reminders")[0].ChildNodes)
+			};
-			{
+
+			foreach (XmlNode reminderXML in xml.GetElementsByTagName("Reminders")[0].ChildNodes) {
 				Reminder nextReminder = Reminder.FromXml(reminderXML);
-				DateTime timeKey = nextReminder.Time;
+				while (result.Reminders.Contains(nextReminder))
-				while (result.Reminders.ContainsKey(timeKey))
+					nextReminder.TweakTime();
-					timeKey = timeKey.AddMilliseconds(1);
+				result.Reminders.Add(nextReminder);
-				result.Reminders.Add(timeKey, nextReminder);
 			}
 
 			return result;

RhinoReminds/RhinoReminds.csproj

@@ -43,19 +43,19 @@
     </Reference>
     <Reference Include="System.Xml" />
     <Reference Include="Microsoft.Recognizers.Definitions">
-      <HintPath>..\packages\Microsoft.Recognizers.Text.1.1.3\lib\net462\Microsoft.Recognizers.Definitions.dll</HintPath>
+      <HintPath>..\packages\Microsoft.Recognizers.Text.1.1.4\lib\net462\Microsoft.Recognizers.Definitions.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.Recognizers.Text">
-      <HintPath>..\packages\Microsoft.Recognizers.Text.1.1.3\lib\net462\Microsoft.Recognizers.Text.dll</HintPath>
+      <HintPath>..\packages\Microsoft.Recognizers.Text.1.1.4\lib\net462\Microsoft.Recognizers.Text.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.Recognizers.Text.Number">
-      <HintPath>..\packages\Microsoft.Recognizers.Text.Number.1.1.3\lib\net462\Microsoft.Recognizers.Text.Number.dll</HintPath>
+      <HintPath>..\packages\Microsoft.Recognizers.Text.Number.1.1.4\lib\net462\Microsoft.Recognizers.Text.Number.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.Recognizers.Text.NumberWithUnit">
-      <HintPath>..\packages\Microsoft.Recognizers.Text.NumberWithUnit.1.1.3\lib\net462\Microsoft.Recognizers.Text.NumberWithUnit.dll</HintPath>
+      <HintPath>..\packages\Microsoft.Recognizers.Text.NumberWithUnit.1.1.4\lib\net462\Microsoft.Recognizers.Text.NumberWithUnit.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.Recognizers.Text.DateTime">
-      <HintPath>..\packages\Microsoft.Recognizers.Text.DateTime.1.1.3\lib\net462\Microsoft.Recognizers.Text.DateTime.dll</HintPath>
+      <HintPath>..\packages\Microsoft.Recognizers.Text.DateTime.1.1.4\lib\net462\Microsoft.Recognizers.Text.DateTime.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
@@ -68,6 +68,8 @@
     <Compile Include="Exceptions.cs" />
     <Compile Include="Utilities\Range.cs" />
     <Compile Include="Utilities\TextHelpers.cs" />
+    <Compile Include="SimpleXmppClient.cs" />
+    <Compile Include="CompareReminders.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />

RhinoReminds/SimpleXmppClient.cs

@@ -0,0 +1,42 @@
+using System;
+using S22.Xmpp;
+using S22.Xmpp.Client;
+using S22.Xmpp.Im;
+
+namespace RhinoReminds
+{
+	public class SimpleXmppClient : XmppClient
+	{
+		public SimpleXmppClient(Jid user, string password) : base(user.Domain, user.Node, password)
+		{
+		}
+
+		/// <summary>
+		/// Sends a chat message to the specified JID.
+		/// </summary>
+		/// <param name="to">The JID to send the message to.</param>
+		/// <param name="message">The messaage to send.</param>
+		public void SendChatMessage(Jid to, string message)
+		{
+			//Console.WriteLine($"[Rhino/Send/Chat] Sending {message} -> {to}");
+			SendMessage(
+				to, message,
+				null, null, MessageType.Chat
+			);
+		}
+		/// <summary>
+		/// Sends a chat message in direct reply to a given incoming message.
+		/// </summary>
+		/// <param name="originalMessage">Original message.</param>
+		/// <param name="reply">Reply.</param>
+		public void SendChatReply(Message originalMessage, string reply)
+		{
+			//Console.WriteLine($"[Rhino/Send/Reply] Sending {reply} -> {originalMessage.From}");
+			SendMessage(
+				originalMessage.From, reply,
+				null, originalMessage.Thread, MessageType.Chat
+			);
+		}
+
+	}
+}

RhinoReminds/packages.config

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.Recognizers.Text" version="1.1.3" targetFramework="net47" />
+  <package id="Microsoft.Recognizers.Text" version="1.1.4" targetFramework="net47" />
-  <package id="Microsoft.Recognizers.Text.DateTime" version="1.1.3" targetFramework="net47" />
+  <package id="Microsoft.Recognizers.Text.DateTime" version="1.1.4" targetFramework="net47" />
-  <package id="Microsoft.Recognizers.Text.Number" version="1.1.3" targetFramework="net47" />
+  <package id="Microsoft.Recognizers.Text.Number" version="1.1.4" targetFramework="net47" />
-  <package id="Microsoft.Recognizers.Text.NumberWithUnit" version="1.1.3" targetFramework="net47" />
+  <package id="Microsoft.Recognizers.Text.NumberWithUnit" version="1.1.4" targetFramework="net47" />
   <package id="S22.Xmpp" version="1.0.0.0" targetFramework="net47" />
   <package id="System.Collections.Immutable" version="1.5.0" targetFramework="net47" />
   <package id="System.ValueTuple" version="4.5.0" targetFramework="net47" />

rhinoreminds.service

@@ -2,15 +2,53 @@
 Description=RhinoReminds XMPP Bot
 After=network.target prosody.service
 
+# No more than 5 crashes in 12 hours
+StartLimitIntervalSec=43200
+StartLimitBurst=5
+
 
 [Service]
-Type=simple
+Type=forking
-# Another Type option: forking
+PIDFile=/run/rhinoreminds/rhinoreminds.pid
-User=rhinoreminds
+# We change our own user
-WorkingDirectory=/srv/rhinoreminds
+User=root
-ExecStart=/srv/rhinoreminds/start_service.sh
+WorkingDirectory=/srv/kraggwapple
+ExecStart=/srv/kraggwapple/start_service.sh
 Restart=on-failure
 # Other Restart options: or always, on-abort, etc
+# Delay restarts by 60 seconds
+RestartSec=60
+
+[Install]
+WantedBy=multi-user.target
+
+
+
+
+
+
+
+
+
+[Unit]
+Description=Kraggwapple XMPP Bot
+After=network.target prosody.service
+
+# No more than 5 crashes in 12 hours
+StartLimitIntervalSec=43200
+StartLimitBurst=5
+
+[Service]
+Type=forking
+PIDFile=/run/kraggwapple.pid
+# We change our own user
+User=root
+WorkingDirectory=/srv/kraggwapple
+ExecStart=/srv/kraggwapple/start_service.sh
+Restart=on-failure
+# Other Restart options: or always, on-abort, etc
+# Delay restarts by 60 seconds
+RestartSec=60
 
 # If you want logs to be kept automatically in /var/log, uncomment the following & copy "rhinoreminds-rsyslog.conf" in the root of this repository to "/etc/rsyslog.d" - and then do `sudo systemctl restart rsyslog.d`
 #StandardOutput=syslog
@@ -19,3 +57,8 @@ Restart=on-failure
 
 [Install]
 WantedBy=multi-user.target
+
+
+
+
+                                           

start_service.sh

@@ -1,8 +1,15 @@
 #!/usr/bin/env bash
 
-source .xmpp_credentials
+cd data;
+source .xmpp_credentials;
 
+# Execute & disown
+# We pass the environment variables explicitly here, as then we don't accidentally pass something private.
+# Better to be safe than sorry - defence in depth!
 export XMPP_JID;
 export XMPP_PASSWORD;
 
-exec /usr/bin/mono RhinoReminds.exe --domain starbeamrainbowlabs.com
+# Create the pidfile directory
+mkdir /run/rhinoreminds; chmod 0700 /run/rhinoreminds; chown rhinoreminds:rhinoreminds /run/rhinoreminds;
+
+sudo -E -u rhinoreminds bash -c '/usr/bin/mono ../bin/RhinoReminds.exe --domain starbeamrainbowlabs.com --avatar avatar.png & echo "$!" >/run/rhinoreminds/rhinoreminds.pid; disown'