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Retry skipped guilds after reconnection

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Noi 2023-07-04 15:24:35 -07:00
parent ac1b4aec32
commit 21cbadb355
1 changed files with 25 additions and 18 deletions
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37
BackgroundServices/AutoUserDownload.cs
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@ -6,10 +6,18 @@ namespace BirthdayBot.BackgroundServices;
/// Proactively fills the user cache for guilds in which any birthday data already exists.
/// </summary>
class AutoUserDownload : BackgroundService {
public AutoUserDownload(ShardInstance instance) : base(instance) { }
private static readonly TimeSpan RequestTimeout = ShardManager.DeadShardThreshold / 3;
private static readonly HashSet<ulong> _failedDownloads = new();
private static readonly TimeSpan _singleDlTimeout = ShardManager.DeadShardThreshold / 3;
private readonly HashSet<ulong> _skippedGuilds = new();
public AutoUserDownload(ShardInstance instance) : base(instance)
=> Shard.DiscordClient.Disconnected += OnDisconnect;
~AutoUserDownload() => Shard.DiscordClient.Disconnected -= OnDisconnect;
private Task OnDisconnect(Exception ex) {
_skippedGuilds.Clear();
return Task.CompletedTask;
}
public override async Task OnTick(int tickCount, CancellationToken token) {
// Take action if a guild's cache is incomplete...
@ -22,13 +30,11 @@ class AutoUserDownload : BackgroundService {
try {
await ConcurrentSemaphore.WaitAsync(token);
using var db = new BotDatabaseContext();
lock (_failedDownloads)
mustFetch = db.UserEntries.AsNoTracking()
.Where(e => incompleteCaches.Contains(e.GuildId))
.Select(e => e.GuildId)
.Distinct()
.Where(e => !_failedDownloads.Contains(e))
.ToList();
.Where(e => !_skippedGuilds.Contains(e))
.ToHashSet();
} finally {
try {
ConcurrentSemaphore.Release();
@ -38,27 +44,28 @@ class AutoUserDownload : BackgroundService {
var processed = 0;
var processStartTime = DateTimeOffset.UtcNow;
foreach (var item in mustFetch) {
// May cause a disconnect in certain situations. Make no further attempts until the next pass if it happens.
// Take break from processing to avoid getting killed by ShardManager
if (DateTimeOffset.UtcNow - processStartTime > RequestTimeout) break;
// We're useless if not connected
if (Shard.DiscordClient.ConnectionState != ConnectionState.Connected) break;
var guild = Shard.DiscordClient.GetGuild(item);
if (guild == null) continue; // A guild disappeared...?
await Task.Delay(200, CancellationToken.None); // Delay a bit (reduces the possibility of hanging, somehow).
processed++;
await Task.Delay(200, CancellationToken.None); // Delay a bit (reduces the possibility of hanging, somehow).
var dl = guild.DownloadUsersAsync();
dl.Wait((int)_singleDlTimeout.TotalMilliseconds / 2, token);
dl.Wait((int)RequestTimeout.TotalMilliseconds / 2, token);
if (dl.IsFaulted) {
Log("Exception thrown by download task: " + dl.Exception);
break;
} else if (!dl.IsCompletedSuccessfully) {
Log($"Task for guild {guild.Id} is unresponsive. Skipping guild. Members: {guild.MemberCount}. Name: {guild.Name}.");
lock (_failedDownloads) _failedDownloads.Add(guild.Id);
Log($"Task unresponsive, will skip (ID {guild.Id}, with {guild.MemberCount} members).");
_skippedGuilds.Add(guild.Id);
continue;
}
// Prevent unnecessary disconnections by ShardManager if we're taking too long
if (DateTimeOffset.UtcNow - processStartTime > _singleDlTimeout) break;
}
if (processed > 10) Log($"Member list downloads handled for {processed} guilds.");