Update socket presence and add new presence event (#1945)

src/Discord.Net.Core/Entities/Users/IPresence.cs

@@ -1,4 +1,4 @@
-using System.Collections.Immutable;
+using System.Collections.Generic;
 
 namespace Discord
 {
@@ -14,10 +14,10 @@ namespace Discord
         /// <summary>
         ///     Gets the set of clients where this user is currently active.
         /// </summary>
-        IImmutableSet<ClientType> ActiveClients { get; }
+        IReadOnlyCollection<ClientType> ActiveClients { get; }
         /// <summary>
         ///     Gets the list of activities that this user currently has available.
         /// </summary>
-        IImmutableList<IActivity> Activities { get; }
+        IReadOnlyCollection<IActivity> Activities { get; }
     }
 }

src/Discord.Net.Rest/Entities/Users/RestUser.cs

@@ -5,6 +5,7 @@ using System.Globalization;
 using System.Threading.Tasks;
 using Model = Discord.API.User;
 using EventUserModel = Discord.API.GuildScheduledEventUser;
+using System.Collections.Generic;
 
 namespace Discord.Rest
 {
@@ -41,9 +42,9 @@ namespace Discord.Rest
         /// <inheritdoc />
         public virtual UserStatus Status => UserStatus.Offline;
         /// <inheritdoc />
-        public virtual IImmutableSet<ClientType> ActiveClients => ImmutableHashSet<ClientType>.Empty;
+        public virtual IReadOnlyCollection<ClientType> ActiveClients => ImmutableHashSet<ClientType>.Empty;
         /// <inheritdoc />
-        public virtual IImmutableList<IActivity> Activities => ImmutableList<IActivity>.Empty;
+        public virtual IReadOnlyCollection<IActivity> Activities => ImmutableList<IActivity>.Empty;
         /// <inheritdoc />
         public virtual bool IsWebhook => false;
 

src/Discord.Net.WebSocket/BaseSocketClient.Events.cs

@@ -502,6 +502,18 @@ namespace Discord.WebSocket
         internal readonly AsyncEvent<Func<SocketGroupUser, Task>> _recipientRemovedEvent = new AsyncEvent<Func<SocketGroupUser, Task>>();
         #endregion
 
+        #region Presence
+
+        /// <summary> Fired when a users presence is updated. </summary>
+        public event Func<SocketUser, SocketPresence, SocketPresence, Task> PresenceUpdated
+        {
+            add { _presenceUpdated.Add(value); }
+            remove { _presenceUpdated.Remove(value); }
+        }
+        internal readonly AsyncEvent<Func<SocketUser, SocketPresence, SocketPresence, Task>> _presenceUpdated = new AsyncEvent<Func<SocketUser, SocketPresence, SocketPresence, Task>>();
+
+        #endregion
+
         #region Invites
         /// <summary>
         ///     Fired when an invite is created.

src/Discord.Net.WebSocket/DiscordSocketClient.cs

@@ -1858,6 +1858,8 @@ namespace Discord.WebSocket
 
                                     var data = (payload as JToken).ToObject<API.Presence>(_serializer);
 
+                                    SocketUser user = null;
+
                                     if (data.GuildId.IsSpecified)
                                     {
                                         var guild = State.GetGuild(data.GuildId.Value);
@@ -1872,7 +1874,7 @@ namespace Discord.WebSocket
                                             return;
                                         }
 
-                                        var user = guild.GetUser(data.User.Id);
+                                        user = guild.GetUser(data.User.Id);
                                         if (user == null)
                                         {
                                             if (data.Status == UserStatus.Offline)
@@ -1890,26 +1892,21 @@ namespace Discord.WebSocket
                                                 await TimedInvokeAsync(_userUpdatedEvent, nameof(UserUpdated), globalBefore, user).ConfigureAwait(false);
                                             }
                                         }
-
-                                        var before = user.Clone();
-                                        user.Update(State, data, true);
-                                        var cacheableBefore = new Cacheable<SocketGuildUser, ulong>(before, user.Id, true, () => Task.FromResult(user));
-                                        await TimedInvokeAsync(_guildMemberUpdatedEvent, nameof(GuildMemberUpdated), cacheableBefore, user).ConfigureAwait(false);
                                     }
                                     else
                                     {
-                                        var globalUser = State.GetUser(data.User.Id);
-                                        if (globalUser == null)
+                                        user = State.GetUser(data.User.Id);
+                                        if (user == null)
                                         {
                                             await UnknownGlobalUserAsync(type, data.User.Id).ConfigureAwait(false);
                                             return;
                                         }
-
-                                        var before = globalUser.Clone();
-                                        globalUser.Update(State, data.User);
-                                        globalUser.Update(State, data);
-                                        await TimedInvokeAsync(_userUpdatedEvent, nameof(UserUpdated), before, globalUser).ConfigureAwait(false);
                                     }
+
+                                    var before = user.Presence.Clone();
+                                    user.Update(State, data.User);
+                                    user.Update(data);
+                                    await TimedInvokeAsync(_presenceUpdated, nameof(PresenceUpdated), user, before, user.Presence).ConfigureAwait(false);
                                 }
                                 break;
                             case "TYPING_START":

src/Discord.Net.WebSocket/Entities/Users/SocketGlobalUser.cs

@@ -1,7 +1,6 @@
 using System.Diagnostics;
 using System.Linq;
 using Model = Discord.API.User;
-using PresenceModel = Discord.API.Presence;
 
 namespace Discord.WebSocket
 {
@@ -48,11 +47,6 @@ namespace Discord.WebSocket
             }
         }
 
-        internal void Update(ClientState state, PresenceModel model)
-        {
-            Presence = SocketPresence.Create(model);
-        }
-
         private string DebuggerDisplay => $"{Username}#{Discriminator} ({Id}{(IsBot ? ", Bot" : "")}, Global)";
         internal new SocketGlobalUser Clone() => MemberwiseClone() as SocketGlobalUser;
     }

src/Discord.Net.WebSocket/Entities/Users/SocketGuildUser.cs

@@ -164,8 +164,7 @@ namespace Discord.WebSocket
         {
             if (updatePresence)
             {
-                Presence = SocketPresence.Create(model);
-                GlobalUser.Update(state, model);
+                Update(model);
             }
             if (model.Nick.IsSpecified)
                 Nickname = model.Nick.Value;
@@ -174,6 +173,13 @@ namespace Discord.WebSocket
             if (model.PremiumSince.IsSpecified)
                 _premiumSinceTicks = model.PremiumSince.Value?.UtcTicks;
         }
+
+        internal override void Update(PresenceModel model)
+        {
+            Presence.Update(model);
+            GlobalUser.Update(model);
+        }
+
         private void UpdateRoles(ulong[] roleIds)
         {
             var roles = ImmutableArray.CreateBuilder<ulong>(roleIds.Length + 1);

src/Discord.Net.WebSocket/Entities/Users/SocketPresence.cs

@@ -11,26 +11,37 @@ namespace Discord.WebSocket
     ///     Represents the WebSocket user's presence status. This may include their online status and their activity.
     /// </summary>
     [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
-    public struct SocketPresence : IPresence
+    public class SocketPresence : IPresence
     {
         /// <inheritdoc />
-        public UserStatus Status { get; }
+        public UserStatus Status { get; private set; }
         /// <inheritdoc />
-        public IImmutableSet<ClientType> ActiveClients { get; }
+        public IReadOnlyCollection<ClientType> ActiveClients { get; private set; }
         /// <inheritdoc />
-        public IImmutableList<IActivity> Activities { get; }
+        public IReadOnlyCollection<IActivity> Activities { get; private set; }
+
+        internal SocketPresence() { }
         internal SocketPresence(UserStatus status, IImmutableSet<ClientType> activeClients, IImmutableList<IActivity> activities)
         {
             Status = status;
             ActiveClients = activeClients ?? ImmutableHashSet<ClientType>.Empty;
             Activities = activities ?? ImmutableList<IActivity>.Empty;
         }
+
         internal static SocketPresence Create(Model model)
         {
-            var clients = ConvertClientTypesDict(model.ClientStatus.GetValueOrDefault());
-            var activities = ConvertActivitiesList(model.Activities);
-            return new SocketPresence(model.Status, clients, activities);
+            var entity = new SocketPresence();
+            entity.Update(model);
+            return entity;
+        }
+
+        internal void Update(Model model)
+        {
+            Status = model.Status;
+            ActiveClients = ConvertClientTypesDict(model.ClientStatus.GetValueOrDefault()) ?? ImmutableArray<ClientType>.Empty;
+            Activities = ConvertActivitiesList(model.Activities) ?? ImmutableArray<IActivity>.Empty;
         }
+
         /// <summary>
         ///     Creates a new <see cref="IReadOnlyCollection{T}"/> containing all of the client types
         ///     where a user is active from the data supplied in the Presence update frame.
@@ -42,7 +53,7 @@ namespace Discord.WebSocket
         /// <returns>
         ///     A collection of all <see cref="ClientType"/>s that this user is active.
         /// </returns>
-        private static IImmutableSet<ClientType> ConvertClientTypesDict(IDictionary<string, string> clientTypesDict)
+        private static IReadOnlyCollection<ClientType> ConvertClientTypesDict(IDictionary<string, string> clientTypesDict)
         {
             if (clientTypesDict == null || clientTypesDict.Count == 0)
                 return ImmutableHashSet<ClientType>.Empty;
@@ -84,6 +95,6 @@ namespace Discord.WebSocket
         public override string ToString() => Status.ToString();
         private string DebuggerDisplay => $"{Status}{(Activities?.FirstOrDefault()?.Name ?? "")}";
 
-        internal SocketPresence Clone() => this;
+        internal SocketPresence Clone() => MemberwiseClone() as SocketPresence;
     }
 }

src/Discord.Net.WebSocket/Entities/Users/SocketUser.cs

@@ -7,6 +7,7 @@ using System.Linq;
 using System.Threading.Tasks;
 using Discord.Rest;
 using Model = Discord.API.User;
+using PresenceModel = Discord.API.Presence;
 
 namespace Discord.WebSocket
 {
@@ -40,9 +41,9 @@ namespace Discord.WebSocket
         /// <inheritdoc />
         public UserStatus Status => Presence.Status;
         /// <inheritdoc />
-        public IImmutableSet<ClientType> ActiveClients => Presence.ActiveClients ?? ImmutableHashSet<ClientType>.Empty;
+        public IReadOnlyCollection<ClientType> ActiveClients => Presence.ActiveClients ?? ImmutableHashSet<ClientType>.Empty;
         /// <inheritdoc />
-        public IImmutableList<IActivity> Activities => Presence.Activities ?? ImmutableList<IActivity>.Empty;
+        public IReadOnlyCollection<IActivity> Activities => Presence.Activities ?? ImmutableList<IActivity>.Empty;
         /// <summary>
         ///     Gets mutual guilds shared with this user.
         /// </summary>
@@ -91,6 +92,11 @@ namespace Discord.WebSocket
             return hasChanges;
         }
 
+        internal virtual void Update(PresenceModel model)
+        {
+            Presence.Update(model);
+        }
+
         /// <inheritdoc />
         public async Task<IDMChannel> CreateDMChannelAsync(RequestOptions options = null)
             => await UserHelper.CreateDMChannelAsync(this, Discord, options).ConfigureAwait(false);