feat(bot): add support for Discord message context commands (#513)

PluralKit.Bot/Utils/InteractionContext.cs

@@ -1,34 +1,77 @@
+using App.Metrics;
+
 using Autofac;
 
+using Myriad.Cache;
 using Myriad.Gateway;
 using Myriad.Rest;
 using Myriad.Types;
 
+using PluralKit.Core;
+
 namespace PluralKit.Bot;
 
 public class InteractionContext
 {
-    private readonly ILifetimeScope _services;
+    private readonly ILifetimeScope _provider;
+    private readonly IMetrics _metrics;
 
-    public InteractionContext(InteractionCreateEvent evt, ILifetimeScope services)
+    public InteractionContext(ILifetimeScope provider, InteractionCreateEvent evt, PKSystem system)
     {
         Event = evt;
-        _services = services;
+        System = system;
+        Cache = provider.Resolve<IDiscordCache>();
+        Rest = provider.Resolve<DiscordApiClient>();
+        Repository = provider.Resolve<ModelRepository>();
+        _metrics = provider.Resolve<IMetrics>();
+        _provider = provider;
     }
 
+    internal readonly IDiscordCache Cache;
+    internal readonly DiscordApiClient Rest;
+    internal readonly ModelRepository Repository;
+    public readonly PKSystem System;
+
     public InteractionCreateEvent Event { get; }
 
+    public ulong GuildId => Event.GuildId;
     public ulong ChannelId => Event.ChannelId;
     public ulong? MessageId => Event.Message?.Id;
     public GuildMember? Member => Event.Member;
     public User User => Event.Member?.User ?? Event.User;
     public string Token => Event.Token;
     public string? CustomId => Event.Data?.CustomId;
+    public IComponentContext Services => _provider;
 
-    public async Task Reply(string content)
+    public async Task Execute<T>(ApplicationCommand? command, Func<T, Task> handler)
+    {
+        try
+        {
+            using (_metrics.Measure.Timer.Time(BotMetrics.ApplicationCommandTime, new MetricTags("Application command", command?.Name ?? "null")))
+                await handler(_provider.Resolve<T>());
+
+            _metrics.Measure.Meter.Mark(BotMetrics.ApplicationCommandsRun);
+        }
+        catch (PKError e)
+        {
+            await Reply($"{Emojis.Error} {e.Message}");
+        }
+        catch (TimeoutException)
+        {
+            // Got a complaint the old error was a bit too patronizing. Hopefully this is better?
+            await Reply($"{Emojis.Error} Operation timed out, sorry. Try again, perhaps?");
+        }
+    }
+
+    public async Task Reply(string content = null, Embed[]? embeds = null)
     {
         await Respond(InteractionResponse.ResponseType.ChannelMessageWithSource,
-            new InteractionApplicationCommandCallbackData { Content = content, Flags = Message.MessageFlags.Ephemeral });
+            new InteractionApplicationCommandCallbackData
+            {
+                Content = content,
+                Embeds = embeds,
+                Flags = Message.MessageFlags.Ephemeral
+            });
     }
 
     public async Task Ignore()
@@ -49,8 +92,7 @@ public class InteractionContext
     public async Task Respond(InteractionResponse.ResponseType type,
                               InteractionApplicationCommandCallbackData? data)
     {
-        var rest = _services.Resolve<DiscordApiClient>();
-        await rest.CreateInteractionResponse(Event.Id, Event.Token,
+        await Rest.CreateInteractionResponse(Event.Id, Event.Token,
             new InteractionResponse { Type = type, Data = data });
     }
 }