Initial commit, basic proxying working

Myriad/Cache/DiscordCacheExtensions.cs

@@ -0,0 +1,50 @@
+using System.Threading.Tasks;
+
+using Myriad.Gateway;
+
+namespace Myriad.Cache
+{
+    public static class DiscordCacheExtensions
+    {
+        public static ValueTask HandleGatewayEvent(this IDiscordCache cache, IGatewayEvent evt)
+        {
+            switch (evt)
+            {
+                case GuildCreateEvent gc:
+                    return cache.SaveGuildCreate(gc);
+                case GuildUpdateEvent gu:
+                    return cache.SaveGuild(gu);
+                case GuildDeleteEvent gd:
+                    return cache.RemoveGuild(gd.Id);
+                case ChannelCreateEvent cc:
+                    return cache.SaveChannel(cc);
+                case ChannelUpdateEvent cu:
+                    return cache.SaveChannel(cu);
+                case ChannelDeleteEvent cd:
+                    return cache.RemoveChannel(cd.Id);
+                case GuildRoleCreateEvent grc:
+                    return cache.SaveRole(grc.GuildId, grc.Role);
+                case GuildRoleUpdateEvent gru:
+                    return cache.SaveRole(gru.GuildId, gru.Role);
+                case GuildRoleDeleteEvent grd:
+                    return cache.RemoveRole(grd.GuildId, grd.RoleId);
+                case MessageCreateEvent mc:
+                    return cache.SaveUser(mc.Author);
+            }
+
+            return default;
+        }
+
+        private static async ValueTask SaveGuildCreate(this IDiscordCache cache, GuildCreateEvent guildCreate)
+        {
+            await cache.SaveGuild(guildCreate);
+
+            foreach (var channel in guildCreate.Channels)
+                // The channel object does not include GuildId for some reason...
+                await cache.SaveChannel(channel with { GuildId = guildCreate.Id });
+
+            foreach (var member in guildCreate.Members)
+                await cache.SaveUser(member.User);
+        }
+    }
+}