BirthdayBot/ShardInstance.cs

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using BirthdayBot.ApplicationCommands;
using BirthdayBot.BackgroundServices;
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using Discord.Interactions;
using Microsoft.Extensions.DependencyInjection;
using System.Reflection;
namespace BirthdayBot;
/// <summary>
/// Single shard instance for Birthday Bot. This shard independently handles all input and output to Discord.
/// </summary>
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public sealed class ShardInstance : IDisposable {
private readonly ShardManager _manager;
private readonly ShardBackgroundWorker _background;
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private readonly InteractionService _interactionService;
private readonly IServiceProvider _services;
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internal DiscordSocketClient DiscordClient { get; }
public int ShardId => DiscordClient.ShardId;
/// <summary>
/// Returns a value showing the time in which the last background run successfully completed.
/// </summary>
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internal DateTimeOffset LastBackgroundRun => _background.LastBackgroundRun;
/// <summary>
/// Returns the name of the background service currently in execution.
/// </summary>
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internal string? CurrentExecutingService => _background.CurrentExecutingService;
internal Configuration Config => _manager.Config;
public const string InternalError = ":x: An unknown error occurred. If it persists, please notify the bot owner.";
/// <summary>
/// Prepares and configures the shard instances, but does not yet start its connection.
/// </summary>
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internal ShardInstance(ShardManager manager, IServiceProvider services) {
_manager = manager;
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_services = services;
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DiscordClient = _services.GetRequiredService<DiscordSocketClient>();
DiscordClient.Log += Client_Log;
DiscordClient.Ready += Client_Ready;
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_interactionService = _services.GetRequiredService<InteractionService>();
DiscordClient.InteractionCreated += DiscordClient_InteractionCreated;
_interactionService.SlashCommandExecuted += InteractionService_SlashCommandExecuted;
DiscordClient.ModalSubmitted += modal => { return ModalResponder.DiscordClient_ModalSubmitted(this, modal); };
// Background task constructor begins background processing immediately.
_background = new ShardBackgroundWorker(this);
}
/// <summary>
/// Starts up this shard's connection to Discord and background task handling associated with it.
/// </summary>
public async Task StartAsync() {
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await _interactionService.AddModulesAsync(Assembly.GetExecutingAssembly(), _services).ConfigureAwait(false);
await DiscordClient.LoginAsync(TokenType.Bot, Config.BotToken).ConfigureAwait(false);
await DiscordClient.StartAsync().ConfigureAwait(false);
}
/// <summary>
/// Does all necessary steps to stop this shard, including canceling background tasks and disconnecting.
/// </summary>
public void Dispose() {
_background.Dispose();
DiscordClient.LogoutAsync().Wait(5000);
DiscordClient.Dispose();
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_interactionService.Dispose();
}
internal void Log(string source, string message) => Program.Log($"Shard {ShardId:00}] [{source}", message);
private Task Client_Log(LogMessage arg) {
// Suppress certain messages
if (arg.Message != null) {
if (!_manager.Config.LogConnectionStatus) {
switch (arg.Message) {
case "Connecting":
case "Connected":
case "Ready":
case "Disconnecting":
case "Disconnected":
case "Resumed previous session":
case "Failed to resume previous session":
case "Serializer Error": // The exception associated with this log appears a lot as of v3.2-ish
return Task.CompletedTask;
}
}
Log("Discord.Net", $"{arg.Severity}: {arg.Message}");
}
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if (arg.Exception != null) {
if (!_manager.Config.LogConnectionStatus) {
if (arg.Exception is GatewayReconnectException || arg.Exception.Message == "WebSocket connection was closed")
return Task.CompletedTask;
}
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if (arg.Exception is TaskCanceledException) return Task.CompletedTask; // We don't ever need to know these...
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Log("Discord.Net exception", $"{arg.Exception.GetType().FullName}: {arg.Exception.Message}");
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}
return Task.CompletedTask;
}
private async Task Client_Ready() {
#if !DEBUG
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// Update slash/interaction commands
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if (ShardId == 0) {
await _interactionService.RegisterCommandsGloballyAsync(true);
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Log(nameof(ShardInstance), "Updated global command registration.");
}
#else
// Debug: Register our commands locally instead, in each guild we're in
if (DiscordClient.Guilds.Count > 5) {
Program.Log(nameof(ShardInstance), "Are you debugging in production?! Skipping DEBUG command registration.");
return;
} else {
foreach (var g in DiscordClient.Guilds) {
await _interactionService.RegisterCommandsToGuildAsync(g.Id, true).ConfigureAwait(false);
Log(nameof(ShardInstance), $"Updated DEBUG command registration in guild {g.Id}.");
}
}
#endif
}
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// Slash command preparation and invocation
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private async Task DiscordClient_InteractionCreated(SocketInteraction arg) {
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var context = new SocketInteractionContext(DiscordClient, arg);
try {
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await _interactionService.ExecuteCommandAsync(context, _services).ConfigureAwait(false);
} catch (Exception e) {
Log(nameof(DiscordClient_InteractionCreated), $"Unhandled exception. {e}");
if (arg.Type == InteractionType.ApplicationCommand) {
if (arg.HasResponded) await arg.ModifyOriginalResponseAsync(prop => prop.Content = InternalError);
else await arg.RespondAsync(InternalError);
}
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}
}
// Slash command logging and failed execution handling
private Task InteractionService_SlashCommandExecuted(SlashCommandInfo info, IInteractionContext context, IResult result) {
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string sender;
if (context.Guild != null) sender = $"{context.Guild}!{context.User}";
else sender = $"{context.User} in non-guild context";
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var logresult = $"{(result.IsSuccess ? "Success" : "Fail")}: `/{info}` by {sender}.";
if (result.Error != null) {
// Additional log information with error detail
logresult += " " + Enum.GetName(typeof(InteractionCommandError), result.Error) + ": " + result.ErrorReason;
}
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Log("Command", logresult);
return Task.CompletedTask;
}
}