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Fix possible race condition for reaction roles

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This commit is contained in:
Kaoticz
2021-11-09 10:41:49 +00:00
committed by Kwoth
parent aae2805785
commit 1d57191700
1 changed files with 121 additions and 65 deletions
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186
src/NadekoBot/Modules/Administration/Services/RoleCommandsService.cs
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@@ -12,6 +12,8 @@ using LinqToDB;
using LinqToDB.EntityFrameworkCore;
using NadekoBot.Db;
using Serilog;
using System.Threading;
using System;
namespace NadekoBot.Modules.Administration.Services
{
@@ -21,6 +23,11 @@ namespace NadekoBot.Modules.Administration.Services
private readonly DiscordSocketClient _client;
private readonly ConcurrentDictionary<ulong, IndexedCollection<ReactionRoleMessage>> _models;
/// <summary>
/// Contains the (Message ID, User ID) of reaction roles that are currently being processed.
/// </summary>
private readonly ConcurrentHashSet<(ulong, ulong)> _reacting = new();
public RoleCommandsService(DiscordSocketClient client, DbService db,
Bot bot)
{
@@ -38,75 +45,58 @@ namespace NadekoBot.Modules.Administration.Services
private Task _client_ReactionAdded(Cacheable<IUserMessage, ulong> msg, ISocketMessageChannel chan, SocketReaction reaction)
{
var _ = Task.Run(async () =>
_ = Task.Run(async () =>
{
try
if (!reaction.User.IsSpecified ||
reaction.User.Value.IsBot ||
reaction.User.Value is not SocketGuildUser gusr ||
chan is not SocketGuildChannel gch ||
!_models.TryGetValue(gch.Guild.Id, out var confs))
return;
var conf = confs.FirstOrDefault(x => x.MessageId == msg.Id);
if (conf is null)
return;
// compare emote names for backwards compatibility :facepalm:
var reactionRole = conf.ReactionRoles.FirstOrDefault(x => x.EmoteName == reaction.Emote.Name || x.EmoteName == reaction.Emote.ToString());
if (reactionRole != null)
{
if (!reaction.User.IsSpecified ||
reaction.User.Value.IsBot ||
!(reaction.User.Value is SocketGuildUser gusr))
return;
if (!(chan is SocketGuildChannel gch))
return;
if (!_models.TryGetValue(gch.Guild.Id, out var confs))
return;
var conf = confs.FirstOrDefault(x => x.MessageId == msg.Id);
if (conf is null)
return;
// compare emote names for backwards compatibility :facepalm:
var reactionRole = conf.ReactionRoles.FirstOrDefault(x => x.EmoteName == reaction.Emote.Name || x.EmoteName == reaction.Emote.ToString());
if (reactionRole != null)
if (!conf.Exclusive)
{
if (conf.Exclusive)
{
var roleIds = conf.ReactionRoles.Select(x => x.RoleId)
.Where(x => x != reactionRole.RoleId)
.Select(x => gusr.Guild.GetRole(x))
.Where(x => x != null);
var __ = Task.Run(async () =>
{
try
{
//if the role is exclusive,
// remove all other reactions user added to the message
var dl = await msg.GetOrDownloadAsync().ConfigureAwait(false);
foreach (var r in dl.Reactions)
{
if (r.Key.Name == reaction.Emote.Name)
continue;
try { await dl.RemoveReactionAsync(r.Key, gusr).ConfigureAwait(false); } catch { }
await Task.Delay(100).ConfigureAwait(false);
}
}
catch { }
});
await gusr.RemoveRolesAsync(roleIds).ConfigureAwait(false);
}
var toAdd = gusr.Guild.GetRole(reactionRole.RoleId);
if (toAdd != null && !gusr.Roles.Contains(toAdd))
{
await gusr.AddRolesAsync(new[] { toAdd }).ConfigureAwait(false);
}
await AddReactionRoleAsync(gusr, reactionRole);
return;
}
else
// If same (message, user) are being processed in an exclusive rero, quit
if (!_reacting.Add((msg.Id, reaction.UserId)))
return;
try
{
var dl = await msg.GetOrDownloadAsync().ConfigureAwait(false);
await dl.RemoveReactionAsync(reaction.Emote, dl.Author,
new RequestOptions()
{
RetryMode = RetryMode.RetryRatelimit | RetryMode.Retry502
}).ConfigureAwait(false);
Log.Warning("User {0} is adding unrelated reactions to the reaction roles message.", dl.Author);
var removeExclusiveTask = RemoveExclusiveReactionRoleAsync(msg, gusr, reaction, conf, reactionRole, CancellationToken.None);
var addRoleTask = AddReactionRoleAsync(gusr, reactionRole);
await Task.WhenAll(removeExclusiveTask, addRoleTask).ConfigureAwait(false);
}
finally
{
// Free (message/user) for another exclusive rero
_reacting.TryRemove((msg.Id, reaction.UserId));
}
}
catch { }
else
{
var dl = await msg.GetOrDownloadAsync().ConfigureAwait(false);
await dl.RemoveReactionAsync(reaction.Emote, dl.Author,
new RequestOptions()
{
RetryMode = RetryMode.RetryRatelimit | RetryMode.Retry502
}).ConfigureAwait(false);
Log.Warning("User {0} is adding unrelated reactions to the reaction roles message.", dl.Author);
}
});
return Task.CompletedTask;
@@ -114,16 +104,16 @@ namespace NadekoBot.Modules.Administration.Services
private Task _client_ReactionRemoved(Cacheable<IUserMessage, ulong> msg, ISocketMessageChannel chan, SocketReaction reaction)
{
var _ = Task.Run(async () =>
_ = Task.Run(async () =>
{
try
{
if (!reaction.User.IsSpecified ||
reaction.User.Value.IsBot ||
!(reaction.User.Value is SocketGuildUser gusr))
reaction.User.Value is not SocketGuildUser gusr)
return;
if (!(chan is SocketGuildChannel gch))
if (chan is not SocketGuildChannel gch)
return;
if (!_models.TryGetValue(gch.Guild.Id, out var confs))
@@ -193,5 +183,71 @@ namespace NadekoBot.Modules.Administration.Services
uow.SaveChanges();
}
}
/// <summary>
/// Adds a reaction role to the specified user.
/// </summary>
/// <param name="user">A Discord guild user.</param>
/// <param name="dbRero">The database settings of this reaction role.</param>
private Task AddReactionRoleAsync(SocketGuildUser user, ReactionRole dbRero)
{
var toAdd = user.Guild.GetRole(dbRero.RoleId);
return (toAdd != null && !user.Roles.Contains(toAdd))
? user.AddRoleAsync(toAdd)
: Task.CompletedTask;
}
/// <summary>
/// Removes the exclusive reaction roles and reactions from the specified user.
/// </summary>
/// <param name="reactionMessage">The Discord message that contains the reaction roles.</param>
/// <param name="user">A Discord guild user.</param>
/// <param name="reaction">The Discord reaction of the user.</param>
/// <param name="dbReroMsg">The database entry of the reaction role message.</param>
/// <param name="dbRero">The database settings of this reaction role.</param>
/// <param name="cToken">A cancellation token to cancel the operation.</param>
/// <exception cref="OperationCanceledException">Occurs when the operation is cancelled before it began.</exception>
/// <exception cref="TaskCanceledException">Occurs when the operation is cancelled while it's still executing.</exception>
private Task RemoveExclusiveReactionRoleAsync(Cacheable<IUserMessage, ulong> reactionMessage, SocketGuildUser user, SocketReaction reaction, ReactionRoleMessage dbReroMsg, ReactionRole dbRero, CancellationToken cToken = default)
{
cToken.ThrowIfCancellationRequested();
var roleIds = dbReroMsg.ReactionRoles.Select(x => x.RoleId)
.Where(x => x != dbRero.RoleId)
.Select(x => user.Guild.GetRole(x))
.Where(x => x != null);
var removeReactionsTask = RemoveOldReactionsAsync(reactionMessage, user, reaction, cToken);
var removeRolesTask = user.RemoveRolesAsync(roleIds);
return Task.WhenAll(removeReactionsTask, removeRolesTask);
}
/// <summary>
/// Removes old reactions from an exclusive reaction role.
/// </summary>
/// <param name="reactionMessage">The Discord message that contains the reaction roles.</param>
/// <param name="user">A Discord guild user.</param>
/// <param name="reaction">The Discord reaction of the user.</param>
/// <param name="cToken">A cancellation token to cancel the operation.</param>
/// <exception cref="OperationCanceledException">Occurs when the operation is cancelled before it began.</exception>
/// <exception cref="TaskCanceledException">Occurs when the operation is cancelled while it's still executing.</exception>
private async Task RemoveOldReactionsAsync(Cacheable<IUserMessage, ulong> reactionMessage, SocketGuildUser user, SocketReaction reaction, CancellationToken cToken = default)
{
cToken.ThrowIfCancellationRequested();
//if the role is exclusive,
// remove all other reactions user added to the message
var dl = await reactionMessage.GetOrDownloadAsync().ConfigureAwait(false);
foreach (var r in dl.Reactions)
{
if (r.Key.Name == reaction.Emote.Name)
continue;
try { await dl.RemoveReactionAsync(r.Key, user).ConfigureAwait(false); } catch { }
await Task.Delay(100, cToken).ConfigureAwait(false);
}
}
}
}