WIP new shard implementation

This commit is contained in:
Ske 2021-04-29 11:10:19 +02:00
parent a2d2036851
commit 118f2d49a6
28 changed files with 725 additions and 547 deletions

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@ -1,6 +1,4 @@
using System;
using Myriad.Gateway;
using Myriad.Gateway;
using Myriad.Types;
namespace Myriad.Extensions

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@ -1,7 +1,6 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Myriad.Cache;
using Myriad.Gateway;

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@ -15,6 +15,7 @@ namespace Myriad.Gateway
private readonly GatewaySettings _gatewaySettings;
private readonly ILogger _logger;
private readonly ConcurrentDictionary<int, Shard> _shards = new();
private ShardIdentifyRatelimiter? _ratelimiter;
public Cluster(GatewaySettings gatewaySettings, ILogger logger)
{
@ -26,81 +27,35 @@ namespace Myriad.Gateway
public event Action<Shard>? ShardCreated;
public IReadOnlyDictionary<int, Shard> Shards => _shards;
public ClusterSessionState SessionState => GetClusterState();
public User? User => _shards.Values.Select(s => s.User).FirstOrDefault(s => s != null);
public ApplicationPartial? Application => _shards.Values.Select(s => s.Application).FirstOrDefault(s => s != null);
private ClusterSessionState GetClusterState()
public async Task Start(GatewayInfo.Bot info)
{
var shards = new List<ClusterSessionState.ShardState>();
foreach (var (id, shard) in _shards)
shards.Add(new ClusterSessionState.ShardState
{
Shard = shard.ShardInfo,
Session = shard.SessionInfo
});
var concurrency = GetActualShardConcurrency(info.SessionStartLimit.MaxConcurrency);
_ratelimiter = new(_logger, concurrency);
return new ClusterSessionState {Shards = shards};
await Start(info.Url, info.Shards);
}
public async Task Start(GatewayInfo.Bot info, ClusterSessionState? lastState = null)
{
if (lastState != null && lastState.Shards.Count == info.Shards)
await Resume(info.Url, lastState, info.SessionStartLimit.MaxConcurrency);
else
await Start(info.Url, info.Shards, info.SessionStartLimit.MaxConcurrency);
}
public async Task Resume(string url, ClusterSessionState sessionState, int concurrency)
{
_logger.Information("Resuming session with {ShardCount} shards at {Url}", sessionState.Shards.Count, url);
foreach (var shardState in sessionState.Shards)
CreateAndAddShard(url, shardState.Shard, shardState.Session);
await StartShards(concurrency);
}
public async Task Start(string url, int shardCount, int concurrency)
public async Task Start(string url, int shardCount)
{
_logger.Information("Starting {ShardCount} shards at {Url}", shardCount, url);
for (var i = 0; i < shardCount; i++)
CreateAndAddShard(url, new ShardInfo(i, shardCount), null);
CreateAndAddShard(url, new ShardInfo(i, shardCount));
await StartShards(concurrency);
await StartShards();
}
private async Task StartShards(int concurrency)
private async Task StartShards()
{
concurrency = GetActualShardConcurrency(concurrency);
var lastTime = DateTimeOffset.UtcNow;
var identifyCalls = 0;
_logger.Information("Connecting shards...");
foreach (var shard in _shards.Values)
{
if (identifyCalls >= concurrency)
{
var timeout = lastTime + TimeSpan.FromSeconds(5.5);
var delay = timeout - DateTimeOffset.UtcNow;
if (delay > TimeSpan.Zero)
{
_logger.Information("Hit shard concurrency limit, waiting {Delay}", delay);
await Task.Delay(delay);
}
identifyCalls = 0;
lastTime = DateTimeOffset.UtcNow;
}
await shard.Start();
identifyCalls++;
}
}
private void CreateAndAddShard(string url, ShardInfo shardInfo, ShardSessionInfo? session)
private void CreateAndAddShard(string url, ShardInfo shardInfo)
{
var shard = new Shard(_logger, new Uri(url), _gatewaySettings, shardInfo, session);
var shard = new Shard(_gatewaySettings, shardInfo, _ratelimiter!, url, _logger);
shard.OnEventReceived += evt => OnShardEventReceived(shard, evt);
_shards[shardInfo.ShardId] = shard;

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@ -1,15 +0,0 @@
using System.Collections.Generic;
namespace Myriad.Gateway
{
public record ClusterSessionState
{
public List<ShardState> Shards { get; init; }
public record ShardState
{
public ShardInfo Shard { get; init; }
public ShardSessionInfo Session { get; init; }
}
}
}

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@ -1,6 +1,4 @@
using System.Collections.Generic;
using Myriad.Types;
using Myriad.Types;
namespace Myriad.Gateway
{

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@ -3,6 +3,7 @@ using System.Net.WebSockets;
using System.Text.Json;
using System.Threading.Tasks;
using Myriad.Gateway.State;
using Myriad.Serialization;
using Myriad.Types;
@ -10,340 +11,192 @@ using Serilog;
namespace Myriad.Gateway
{
public class Shard: IAsyncDisposable
public class Shard
{
private const string LibraryName = "Myriad (for PluralKit)";
private readonly JsonSerializerOptions _jsonSerializerOptions =
new JsonSerializerOptions().ConfigureForMyriad();
private readonly GatewaySettings _settings;
private readonly ShardInfo _info;
private readonly ShardIdentifyRatelimiter _ratelimiter;
private readonly string _url;
private readonly ILogger _logger;
private readonly Uri _uri;
private readonly ShardStateManager _stateManager;
private readonly JsonSerializerOptions _jsonSerializerOptions;
private readonly ShardConnection _conn;
private ShardConnection? _conn;
private TimeSpan? _currentHeartbeatInterval;
private bool _hasReceivedAck;
private DateTimeOffset? _lastHeartbeatSent;
private Task _worker;
public int ShardId => _info.ShardId;
public ShardState State => _stateManager.State;
public TimeSpan? Latency => _stateManager.Latency;
public User? User => _stateManager.User;
public ApplicationPartial? Application => _stateManager.Application;
public ShardInfo ShardInfo { get; private set; }
public int ShardId => ShardInfo.ShardId;
public GatewaySettings Settings { get; }
public ShardSessionInfo SessionInfo { get; private set; }
public ShardState State { get; private set; }
public TimeSpan? Latency { get; private set; }
public User? User { get; private set; }
public ApplicationPartial? Application { get; private set; }
public Func<IGatewayEvent, Task>? OnEventReceived { get; set; }
// TODO: I wanna get rid of these or move them at some point
public event Func<IGatewayEvent, Task>? OnEventReceived;
public event Action<TimeSpan>? HeartbeatReceived;
public event Action? SocketOpened;
public event Action? Resumed;
public event Action? Ready;
public event Action<WebSocketCloseStatus, string?>? SocketClosed;
public event Action<WebSocketCloseStatus?, string?>? SocketClosed;
public Shard(ILogger logger, Uri uri, GatewaySettings settings, ShardInfo info,
ShardSessionInfo? sessionInfo = null)
private TimeSpan _reconnectDelay = TimeSpan.Zero;
private Task? _worker;
public Shard(GatewaySettings settings, ShardInfo info, ShardIdentifyRatelimiter ratelimiter, string url, ILogger logger)
{
_logger = logger.ForContext<Shard>();
_uri = uri;
_jsonSerializerOptions = new JsonSerializerOptions().ConfigureForMyriad();
Settings = settings;
ShardInfo = info;
SessionInfo = sessionInfo ?? new ShardSessionInfo();
_settings = settings;
_info = info;
_ratelimiter = ratelimiter;
_url = url;
_logger = logger;
_stateManager = new ShardStateManager(info, _jsonSerializerOptions, logger)
{
HandleEvent = HandleEvent,
SendHeartbeat = SendHeartbeat,
SendIdentify = SendIdentify,
SendResume = SendResume,
Connect = ConnectInner,
Reconnect = Reconnect,
};
_stateManager.OnHeartbeatReceived += latency =>
{
HeartbeatReceived?.Invoke(latency);
};
_conn = new ShardConnection(_jsonSerializerOptions, _logger);
}
public async ValueTask DisposeAsync()
private async Task ShardLoop()
{
if (_conn != null)
await _conn.DisposeAsync();
while (true)
{
try
{
await ConnectInner();
await HandleConnectionOpened();
while (_conn.State == WebSocketState.Open)
{
var packet = await _conn.Read();
if (packet == null)
break;
await _stateManager.HandlePacketReceived(packet);
}
await HandleConnectionClosed(_conn.CloseStatus, _conn.CloseStatusDescription);
_logger.Information("Shard {ShardId}: Reconnecting after delay {ReconnectDelay}",
_info.ShardId, _reconnectDelay);
if (_reconnectDelay > TimeSpan.Zero)
await Task.Delay(_reconnectDelay);
}
catch (Exception e)
{
_logger.Error(e, "Shard {ShardId}: Error in main shard loop, reconnecting in 5 seconds...", _info.ShardId);
// todo: exponential backoff here? this should never happen, ideally...
await Task.Delay(TimeSpan.FromSeconds(5));
}
}
}
public Task Start()
{
_worker = MainLoop();
if (_worker == null)
_worker = ShardLoop();
return Task.CompletedTask;
}
public async Task UpdateStatus(GatewayStatusUpdate payload)
{
if (_conn != null && _conn.State == WebSocketState.Open)
await _conn!.Send(new GatewayPacket {Opcode = GatewayOpcode.PresenceUpdate, Payload = payload});
await _conn.Send(new GatewayPacket
{
Opcode = GatewayOpcode.PresenceUpdate,
Payload = payload
});
}
private async Task MainLoop()
private async Task ConnectInner()
{
while (true)
try
{
_logger.Information("Shard {ShardId}: Connecting...", ShardId);
await _ratelimiter.Acquire(_info.ShardId);
State = ShardState.Connecting;
await Connect();
_logger.Information("Shard {ShardId}: Connected. Entering main loop...", ShardId);
// Tick returns false if we need to stop and reconnect
while (await Tick(_conn!))
await Task.Delay(TimeSpan.FromMilliseconds(1000));
_logger.Information("Shard {ShardId}: Connection closed, reconnecting...", ShardId);
State = ShardState.Closed;
}
catch (Exception e)
{
_logger.Error(e, "Shard {ShardId}: Error in shard state handler", ShardId);
}
_logger.Information("Shard {ShardId}: Connecting to WebSocket", _info.ShardId);
await _conn.Connect(_url, default);
}
private async Task<bool> Tick(ShardConnection conn)
private async Task DisconnectInner(WebSocketCloseStatus closeStatus)
{
if (conn.State != WebSocketState.Connecting && conn.State != WebSocketState.Open)
return false;
if (!await TickHeartbeat(conn))
// TickHeartbeat returns false if we're disconnecting
return false;
return true;
}
private async Task<bool> TickHeartbeat(ShardConnection conn)
{
// If we don't need to heartbeat, do nothing
if (_lastHeartbeatSent == null || _currentHeartbeatInterval == null)
return true;
if (DateTimeOffset.UtcNow - _lastHeartbeatSent < _currentHeartbeatInterval)
return true;
// If we haven't received the ack in time, close w/ error
if (!_hasReceivedAck)
{
_logger.Warning(
"Shard {ShardId}: Did not receive heartbeat Ack from gateway within interval ({HeartbeatInterval})",
ShardId, _currentHeartbeatInterval);
State = ShardState.Closing;
await conn.Disconnect(WebSocketCloseStatus.ProtocolError, "Did not receive ACK in time");
return false;
}
// Otherwise just send it :)
await SendHeartbeat(conn);
_hasReceivedAck = false;
return true;
}
private async Task SendHeartbeat(ShardConnection conn)
{
_logger.Debug("Shard {ShardId}: Sending heartbeat with seq.no. {LastSequence}",
ShardId, SessionInfo.LastSequence);
await conn.Send(new GatewayPacket {Opcode = GatewayOpcode.Heartbeat, Payload = SessionInfo.LastSequence});
_lastHeartbeatSent = DateTimeOffset.UtcNow;
}
private async Task Connect()
{
if (_conn != null)
await _conn.DisposeAsync();
_currentHeartbeatInterval = null;
_conn = new ShardConnection(_uri, _logger, _jsonSerializerOptions)
{
OnReceive = OnReceive,
OnOpen = () => SocketOpened?.Invoke(),
OnClose = (closeStatus, message) => SocketClosed?.Invoke(closeStatus, message)
};
}
private async Task OnReceive(GatewayPacket packet)
{
switch (packet.Opcode)
{
case GatewayOpcode.Hello:
{
await HandleHello((JsonElement) packet.Payload!);
break;
}
case GatewayOpcode.Heartbeat:
{
_logger.Debug("Shard {ShardId}: Received heartbeat request from shard, sending Ack", ShardId);
await _conn!.Send(new GatewayPacket {Opcode = GatewayOpcode.HeartbeatAck});
break;
}
case GatewayOpcode.HeartbeatAck:
{
Latency = DateTimeOffset.UtcNow - _lastHeartbeatSent;
_logger.Debug("Shard {ShardId}: Received heartbeat Ack with latency {Latency}", ShardId, Latency);
if (Latency != null)
HeartbeatReceived?.Invoke(Latency!.Value);
_hasReceivedAck = true;
break;
}
case GatewayOpcode.Reconnect:
{
_logger.Information("Shard {ShardId}: Received Reconnect, closing and reconnecting", ShardId);
await _conn!.Disconnect(WebSocketCloseStatus.Empty, null);
break;
}
case GatewayOpcode.InvalidSession:
{
var canResume = ((JsonElement) packet.Payload!).GetBoolean();
// Clear session info before DCing
if (!canResume)
SessionInfo = SessionInfo with { Session = null };
var delay = TimeSpan.FromMilliseconds(new Random().Next(1000, 5000));
_logger.Information(
"Shard {ShardId}: Received Invalid Session (can resume? {CanResume}), reconnecting after {ReconnectDelay}",
ShardId, canResume, delay);
await _conn!.Disconnect(WebSocketCloseStatus.Empty, null);
// Will reconnect after exiting this "loop"
await Task.Delay(delay);
break;
}
case GatewayOpcode.Dispatch:
{
SessionInfo = SessionInfo with { LastSequence = packet.Sequence };
var evt = DeserializeEvent(packet.EventType!, (JsonElement) packet.Payload!)!;
if (evt is ReadyEvent rdy)
{
if (State == ShardState.Connecting)
await HandleReady(rdy);
else
_logger.Warning("Shard {ShardId}: Received Ready event in unexpected state {ShardState}, ignoring?",
ShardId, State);
}
else if (evt is ResumedEvent)
{
if (State == ShardState.Connecting)
await HandleResumed();
else
_logger.Warning("Shard {ShardId}: Received Resumed event in unexpected state {ShardState}, ignoring?",
ShardId, State);
}
await HandleEvent(evt);
break;
}
default:
{
_logger.Debug("Shard {ShardId}: Received unknown gateway opcode {Opcode}", ShardId, packet.Opcode);
break;
}
}
}
private async Task HandleEvent(IGatewayEvent evt)
{
if (OnEventReceived != null)
await OnEventReceived.Invoke(evt);
}
private IGatewayEvent? DeserializeEvent(string eventType, JsonElement data)
{
if (!IGatewayEvent.EventTypes.TryGetValue(eventType, out var clrType))
{
_logger.Information("Shard {ShardId}: Received unknown event type {EventType}", ShardId, eventType);
return null;
}
try
{
_logger.Verbose("Shard {ShardId}: Deserializing {EventType} to {ClrType}", ShardId, eventType, clrType);
return JsonSerializer.Deserialize(data.GetRawText(), clrType, _jsonSerializerOptions)
as IGatewayEvent;
}
catch (JsonException e)
{
_logger.Error(e, "Shard {ShardId}: Error deserializing event {EventType} to {ClrType}", ShardId, eventType, clrType);
return null;
}
}
private Task HandleReady(ReadyEvent ready)
{
// TODO: when is ready.Shard ever null?
ShardInfo = ready.Shard ?? new ShardInfo(0, 0);
SessionInfo = SessionInfo with { Session = ready.SessionId };
User = ready.User;
Application = ready.Application;
State = ShardState.Open;
Ready?.Invoke();
return Task.CompletedTask;
}
private Task HandleResumed()
{
State = ShardState.Open;
Resumed?.Invoke();
return Task.CompletedTask;
}
private async Task HandleHello(JsonElement json)
{
var hello = JsonSerializer.Deserialize<GatewayHello>(json.GetRawText(), _jsonSerializerOptions)!;
_logger.Debug("Shard {ShardId}: Received Hello with interval {Interval} ms", ShardId, hello.HeartbeatInterval);
_currentHeartbeatInterval = TimeSpan.FromMilliseconds(hello.HeartbeatInterval);
await SendHeartbeat(_conn!);
await SendIdentifyOrResume();
}
private async Task SendIdentifyOrResume()
{
if (SessionInfo.Session != null && SessionInfo.LastSequence != null)
await SendResume(SessionInfo.Session, SessionInfo.LastSequence!.Value);
else
await SendIdentify();
await _conn.Disconnect(closeStatus, null);
}
private async Task SendIdentify()
{
_logger.Information("Shard {ShardId}: Sending gateway Identify for shard {@ShardInfo}", ShardId, ShardInfo);
await _conn!.Send(new GatewayPacket
await _conn.Send(new GatewayPacket
{
Opcode = GatewayOpcode.Identify,
Payload = new GatewayIdentify
{
Token = Settings.Token,
Compress = false,
Intents = _settings.Intents,
Properties = new GatewayIdentify.ConnectionProperties
{
Browser = LibraryName, Device = LibraryName, Os = Environment.OSVersion.ToString()
Browser = LibraryName,
Device = LibraryName,
Os = Environment.OSVersion.ToString()
},
Intents = Settings.Intents,
Shard = ShardInfo
Shard = _info,
Token = _settings.Token,
LargeThreshold = 50
}
});
}
private async Task SendResume(string session, int lastSequence)
private async Task SendResume((string SessionId, int? LastSeq) arg)
{
_logger.Information("Shard {ShardId}: Sending gateway Resume for session {@SessionInfo}",
ShardId, SessionInfo);
await _conn!.Send(new GatewayPacket
await _conn.Send(new GatewayPacket
{
Opcode = GatewayOpcode.Resume,
Payload = new GatewayResume(Settings.Token, session, lastSequence)
Payload = new GatewayResume(_settings.Token, arg.SessionId, arg.LastSeq ?? 0)
});
}
public enum ShardState
private async Task SendHeartbeat(int? lastSeq)
{
Closed,
Connecting,
Open,
Closing
await _conn.Send(new GatewayPacket {Opcode = GatewayOpcode.Heartbeat, Payload = lastSeq});
}
private async Task Reconnect(WebSocketCloseStatus closeStatus, TimeSpan delay)
{
_reconnectDelay = delay;
await DisconnectInner(closeStatus);
}
private async Task HandleEvent(IGatewayEvent arg)
{
if (arg is ReadyEvent)
Ready?.Invoke();
if (arg is ResumedEvent)
Resumed?.Invoke();
await (OnEventReceived?.Invoke(arg) ?? Task.CompletedTask);
}
private async Task HandleConnectionOpened()
{
_logger.Information("Shard {ShardId}: Connection opened", _info.ShardId);
await _stateManager.HandleConnectionOpened();
SocketOpened?.Invoke();
}
private async Task HandleConnectionClosed(WebSocketCloseStatus? closeStatus, string? description)
{
_logger.Information("Shard {ShardId}: Connection closed ({CloseStatus}/{Description})",
_info.ShardId, closeStatus, description ?? "<null>");
await _stateManager.HandleConnectionClosed();
SocketClosed?.Invoke(closeStatus, description);
}
}
}

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@ -1,6 +1,4 @@
using System;
using System.Buffers;
using System.IO;
using System.Net.WebSockets;
using System.Text.Json;
using System.Threading;
@ -12,120 +10,95 @@ namespace Myriad.Gateway
{
public class ShardConnection: IAsyncDisposable
{
private readonly MemoryStream _bufStream = new();
private readonly ClientWebSocket _client = new();
private readonly CancellationTokenSource _cts = new();
private readonly JsonSerializerOptions _jsonSerializerOptions;
private ClientWebSocket? _client;
private readonly ILogger _logger;
private readonly Task _worker;
private readonly ShardPacketSerializer _serializer;
public ShardConnection(Uri uri, ILogger logger, JsonSerializerOptions jsonSerializerOptions)
public WebSocketState State => _client?.State ?? WebSocketState.Closed;
public WebSocketCloseStatus? CloseStatus => _client?.CloseStatus;
public string? CloseStatusDescription => _client?.CloseStatusDescription;
public ShardConnection(JsonSerializerOptions jsonSerializerOptions, ILogger logger)
{
_logger = logger;
_jsonSerializerOptions = jsonSerializerOptions;
_worker = Worker(uri);
_logger = logger.ForContext<ShardConnection>();
_serializer = new(jsonSerializerOptions);
}
public Func<GatewayPacket, Task>? OnReceive { get; set; }
public Action? OnOpen { get; set; }
public Action<WebSocketCloseStatus, string?>? OnClose { get; set; }
public WebSocketState State => _client.State;
public async ValueTask DisposeAsync()
public async Task Connect(string url, CancellationToken ct)
{
_cts.Cancel();
await _worker;
_client?.Dispose();
_client = new ClientWebSocket();
_client.Dispose();
await _bufStream.DisposeAsync();
_cts.Dispose();
await _client.ConnectAsync(GetConnectionUri(url), ct);
}
private async Task Worker(Uri uri)
public async Task Disconnect(WebSocketCloseStatus closeStatus, string? reason)
{
var realUrl = new UriBuilder(uri)
{
Query = "v=8&encoding=json"
}.Uri;
_logger.Debug("Connecting to gateway WebSocket at {GatewayUrl}", realUrl);
await _client.ConnectAsync(realUrl, default);
_logger.Debug("Gateway connection opened");
OnOpen?.Invoke();
// Main worker loop, spins until we manually disconnect (which hits the cancellation token)
// or the server disconnects us (which sets state to closed)
while (!_cts.IsCancellationRequested && _client.State == WebSocketState.Open)
{
try
{
await HandleReceive();
}
catch (Exception e)
{
_logger.Error(e, "Error in WebSocket receive worker");
}
}
OnClose?.Invoke(_client.CloseStatus ?? default, _client.CloseStatusDescription);
}
private async Task HandleReceive()
{
_bufStream.SetLength(0);
var result = await ReadData(_bufStream);
var data = _bufStream.GetBuffer().AsMemory(0, (int) _bufStream.Position);
if (result.MessageType == WebSocketMessageType.Text)
await HandleReceiveData(data);
else if (result.MessageType == WebSocketMessageType.Close)
_logger.Information("WebSocket closed by server: {StatusCode} {Reason}", _client.CloseStatus,
_client.CloseStatusDescription);
}
private async Task HandleReceiveData(Memory<byte> data)
{
var packet = JsonSerializer.Deserialize<GatewayPacket>(data.Span, _jsonSerializerOptions)!;
try
{
if (OnReceive != null)
await OnReceive.Invoke(packet);
}
catch (Exception e)
{
_logger.Error(e, "Error in gateway handler for {OpcodeType}", packet.Opcode);
}
}
private async Task<ValueWebSocketReceiveResult> ReadData(MemoryStream stream)
{
// TODO: does this throw if we disconnect mid-read?
using var buf = MemoryPool<byte>.Shared.Rent();
ValueWebSocketReceiveResult result;
do
{
result = await _client.ReceiveAsync(buf.Memory, _cts.Token);
stream.Write(buf.Memory.Span.Slice(0, result.Count));
} while (!result.EndOfMessage);
return result;
await CloseInner(closeStatus, reason);
}
public async Task Send(GatewayPacket packet)
{
var bytes = JsonSerializer.SerializeToUtf8Bytes(packet, _jsonSerializerOptions);
await _client.SendAsync(bytes.AsMemory(), WebSocketMessageType.Text, true, default);
if (_client == null || _client.State != WebSocketState.Open)
return;
try
{
await _serializer.WritePacket(_client, packet);
}
catch (Exception e)
{
_logger.Error(e, "Error sending WebSocket message");
}
}
public async Task Disconnect(WebSocketCloseStatus status, string? description)
public async ValueTask DisposeAsync()
{
await _client.CloseAsync(status, description, default);
_cts.Cancel();
await CloseInner(WebSocketCloseStatus.NormalClosure, null);
_client?.Dispose();
}
public async Task<GatewayPacket?> Read()
{
if (_client == null || _client.State != WebSocketState.Open)
return null;
try
{
var (_, packet) = await _serializer.ReadPacket(_client);
return packet;
}
catch (Exception e)
{
_logger.Error(e, "Error reading from WebSocket");
}
return null;
}
private Uri GetConnectionUri(string baseUri) => new UriBuilder(baseUri)
{
Query = "v=8&encoding=json"
}.Uri;
private async Task CloseInner(WebSocketCloseStatus closeStatus, string? description)
{
if (_client == null)
return;
if (_client.State != WebSocketState.Connecting && _client.State != WebSocketState.Open)
return;
// Close with timeout, mostly to work around https://github.com/dotnet/runtime/issues/51590
var cts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
try
{
await _client.CloseAsync(closeStatus, description, cts.Token);
}
catch (Exception e)
{
_logger.Error(e, "Error closing WebSocket connection");
}
}
}
}

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@ -0,0 +1,72 @@
using System;
using System.Collections.Concurrent;
using System.Threading.Tasks;
using Serilog;
namespace Myriad.Gateway
{
public class ShardIdentifyRatelimiter
{
private static readonly TimeSpan BucketLength = TimeSpan.FromSeconds(5);
private readonly ConcurrentDictionary<int, ConcurrentQueue<TaskCompletionSource>> _buckets = new();
private readonly int _maxConcurrency;
private Task? _refillTask;
private readonly ILogger _logger;
public ShardIdentifyRatelimiter(ILogger logger, int maxConcurrency)
{
_logger = logger.ForContext<ShardIdentifyRatelimiter>();
_maxConcurrency = maxConcurrency;
}
public Task Acquire(int shard)
{
var bucket = shard % _maxConcurrency;
var queue = _buckets.GetOrAdd(bucket, _ => new ConcurrentQueue<TaskCompletionSource>());
var tcs = new TaskCompletionSource();
queue.Enqueue(tcs);
ScheduleRefill();
return tcs.Task;
}
private void ScheduleRefill()
{
if (_refillTask != null && !_refillTask.IsCompleted)
return;
_refillTask?.Dispose();
_refillTask = RefillTask();
}
private async Task RefillTask()
{
await Task.Delay(TimeSpan.FromMilliseconds(250));
while (true)
{
var isClear = true;
foreach (var (bucket, queue) in _buckets)
{
if (!queue.TryDequeue(out var tcs))
continue;
_logger.Information(
"Allowing identify for bucket {BucketId} through ({QueueLength} left in bucket queue)",
bucket, queue.Count);
tcs.SetResult();
isClear = false;
}
if (isClear)
return;
await Task.Delay(BucketLength);
}
}
}
}

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@ -0,0 +1,70 @@
using System;
using System.Buffers;
using System.IO;
using System.Net.WebSockets;
using System.Text.Json;
using System.Threading.Tasks;
namespace Myriad.Gateway
{
public class ShardPacketSerializer
{
private const int BufferSize = 64 * 1024;
private readonly JsonSerializerOptions _jsonSerializerOptions;
public ShardPacketSerializer(JsonSerializerOptions jsonSerializerOptions)
{
_jsonSerializerOptions = jsonSerializerOptions;
}
public async ValueTask<(WebSocketMessageType type, GatewayPacket? packet)> ReadPacket(ClientWebSocket socket)
{
using var buf = MemoryPool<byte>.Shared.Rent(BufferSize);
var res = await socket.ReceiveAsync(buf.Memory, default);
if (res.MessageType == WebSocketMessageType.Close)
return (res.MessageType, null);
if (res.EndOfMessage)
// Entire packet fits within one buffer, deserialize directly
return DeserializeSingleBuffer(buf, res);
// Otherwise copy to stream buffer and deserialize from there
return await DeserializeMultipleBuffer(socket, buf, res);
}
public async Task WritePacket(ClientWebSocket socket, GatewayPacket packet)
{
var bytes = JsonSerializer.SerializeToUtf8Bytes(packet, _jsonSerializerOptions);
await socket.SendAsync(bytes.AsMemory(), WebSocketMessageType.Text, true, default);
}
private async Task<(WebSocketMessageType type, GatewayPacket packet)> DeserializeMultipleBuffer(ClientWebSocket socket, IMemoryOwner<byte> buf, ValueWebSocketReceiveResult res)
{
await using var stream = new MemoryStream(BufferSize * 4);
stream.Write(buf.Memory.Span.Slice(0, res.Count));
while (!res.EndOfMessage)
{
res = await socket.ReceiveAsync(buf.Memory, default);
stream.Write(buf.Memory.Span.Slice(0, res.Count));
}
return DeserializeObject(res, stream.GetBuffer().AsSpan(0, (int) stream.Length));
}
private (WebSocketMessageType type, GatewayPacket packet) DeserializeSingleBuffer(
IMemoryOwner<byte> buf, ValueWebSocketReceiveResult res)
{
var span = buf.Memory.Span.Slice(0, res.Count);
return DeserializeObject(res, span);
}
private (WebSocketMessageType type, GatewayPacket packet) DeserializeObject(ValueWebSocketReceiveResult res, Span<byte> span)
{
var packet = JsonSerializer.Deserialize<GatewayPacket>(span, _jsonSerializerOptions)!;
return (res.MessageType, packet);
}
}
}

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@ -1,8 +0,0 @@
namespace Myriad.Gateway
{
public record ShardSessionInfo
{
public string? Session { get; init; }
public int? LastSequence { get; init; }
}
}

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@ -0,0 +1,63 @@
using System;
using System.Threading;
using System.Threading.Tasks;
namespace Myriad.Gateway.State
{
public class HeartbeatWorker: IAsyncDisposable
{
private Task? _worker;
private CancellationTokenSource? _workerCts;
public TimeSpan? CurrentHeartbeatInterval { get; private set; }
public async ValueTask Start(TimeSpan heartbeatInterval, Func<Task> callback)
{
if (_worker != null)
await Stop();
CurrentHeartbeatInterval = heartbeatInterval;
_workerCts = new CancellationTokenSource();
_worker = Worker(heartbeatInterval, callback, _workerCts.Token);
}
public async ValueTask Stop()
{
if (_worker == null)
return;
_workerCts?.Cancel();
try
{
await _worker;
}
catch (TaskCanceledException) { }
_worker?.Dispose();
_workerCts?.Dispose();
_worker = null;
CurrentHeartbeatInterval = null;
}
private async Task Worker(TimeSpan heartbeatInterval, Func<Task> callback, CancellationToken ct)
{
var initialDelay = GetInitialHeartbeatDelay(heartbeatInterval);
await Task.Delay(initialDelay, ct);
while (!ct.IsCancellationRequested)
{
await callback();
await Task.Delay(heartbeatInterval, ct);
}
}
private static TimeSpan GetInitialHeartbeatDelay(TimeSpan heartbeatInterval) =>
// Docs specify `heartbeat_interval * random.random()` but we'll add a lil buffer :)
heartbeatInterval * (new Random().NextDouble() * 0.9 + 0.05);
public async ValueTask DisposeAsync()
{
await Stop();
}
}
}

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@ -0,0 +1,11 @@
namespace Myriad.Gateway.State
{
public enum ShardState
{
Disconnected,
Handshaking,
Identifying,
Connected,
Reconnecting
}
}

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@ -0,0 +1,244 @@
using System;
using System.Net.WebSockets;
using System.Text.Json;
using System.Threading.Tasks;
using Myriad.Gateway.State;
using Myriad.Types;
using Serilog;
namespace Myriad.Gateway
{
public class ShardStateManager
{
private readonly HeartbeatWorker _heartbeatWorker = new();
private readonly ILogger _logger;
private readonly ShardInfo _info;
private readonly JsonSerializerOptions _jsonSerializerOptions;
private ShardState _state = ShardState.Disconnected;
private DateTimeOffset? _lastHeartbeatSent;
private TimeSpan? _latency;
private bool _hasReceivedHeartbeatAck;
private string? _sessionId;
private int? _lastSeq;
public ShardState State => _state;
public TimeSpan? Latency => _latency;
public User? User { get; private set; }
public ApplicationPartial? Application { get; private set; }
public Func<Task> SendIdentify { get; init; }
public Func<(string SessionId, int? LastSeq), Task> SendResume { get; init; }
public Func<int?, Task> SendHeartbeat { get; init; }
public Func<WebSocketCloseStatus, TimeSpan, Task> Reconnect { get; init; }
public Func<Task> Connect { get; init; }
public Func<IGatewayEvent, Task> HandleEvent { get; init; }
public event Action<TimeSpan> OnHeartbeatReceived;
public ShardStateManager(ShardInfo info, JsonSerializerOptions jsonSerializerOptions, ILogger logger)
{
_info = info;
_jsonSerializerOptions = jsonSerializerOptions;
_logger = logger.ForContext<ShardStateManager>();
}
public Task HandleConnectionOpened()
{
_state = ShardState.Handshaking;
return Task.CompletedTask;
}
public async Task HandleConnectionClosed()
{
_latency = null;
await _heartbeatWorker.Stop();
}
public async Task HandlePacketReceived(GatewayPacket packet)
{
switch (packet.Opcode)
{
case GatewayOpcode.Hello:
var hello = DeserializePayload<GatewayHello>(packet);
await HandleHello(hello);
break;
case GatewayOpcode.Heartbeat:
await HandleHeartbeatRequest();
break;
case GatewayOpcode.HeartbeatAck:
await HandleHeartbeatAck();
break;
case GatewayOpcode.Reconnect:
{
await HandleReconnect();
break;
}
case GatewayOpcode.InvalidSession:
{
var canResume = DeserializePayload<bool>(packet);
await HandleInvalidSession(canResume);
break;
}
case GatewayOpcode.Dispatch:
_lastSeq = packet.Sequence;
var evt = DeserializeEvent(packet.EventType!, (JsonElement) packet.Payload!);
if (evt != null)
{
if (evt is ReadyEvent ready)
await HandleReady(ready);
if (evt is ResumedEvent)
await HandleResumed();
await HandleEvent(evt);
}
break;
}
}
private async Task HandleHello(GatewayHello hello)
{
var interval = TimeSpan.FromMilliseconds(hello.HeartbeatInterval);
_hasReceivedHeartbeatAck = true;
await _heartbeatWorker.Start(interval, HandleHeartbeatTimer);
await IdentifyOrResume();
}
private async Task IdentifyOrResume()
{
_state = ShardState.Identifying;
if (_sessionId != null)
{
_logger.Information("Shard {ShardId}: Received Hello, attempting to resume (seq {LastSeq})",
_info.ShardId, _lastSeq);
await SendResume((_sessionId!, _lastSeq));
}
else
{
_logger.Information("Shard {ShardId}: Received Hello, identifying",
_info.ShardId);
await SendIdentify();
}
}
private Task HandleHeartbeatAck()
{
_hasReceivedHeartbeatAck = true;
_latency = DateTimeOffset.UtcNow - _lastHeartbeatSent;
OnHeartbeatReceived?.Invoke(_latency!.Value);
_logger.Information("Shard {ShardId}: Received Heartbeat (latency {Latency} ms)",
_info.ShardId, _latency);
return Task.CompletedTask;
}
private async Task HandleInvalidSession(bool canResume)
{
if (!canResume)
{
_sessionId = null;
_lastSeq = null;
}
_logger.Information("Shard {ShardId}: Received Invalid Session (can resume? {CanResume})",
_info.ShardId, canResume);
var delay = TimeSpan.FromMilliseconds(new Random().Next(1000, 5000));
await DoReconnect(WebSocketCloseStatus.NormalClosure, delay);
}
private async Task HandleReconnect()
{
_logger.Information("Shard {ShardId}: Received Reconnect", _info.ShardId);
await DoReconnect(WebSocketCloseStatus.NormalClosure, TimeSpan.FromSeconds(1));
}
private Task HandleReady(ReadyEvent ready)
{
_logger.Information("Shard {ShardId}: Received Ready", _info.ShardId);
_sessionId = ready.SessionId;
_state = ShardState.Connected;
User = ready.User;
Application = ready.Application;
return Task.CompletedTask;
}
private Task HandleResumed()
{
_logger.Information("Shard {ShardId}: Received Resume", _info.ShardId);
_state = ShardState.Connected;
return Task.CompletedTask;
}
private async Task HandleHeartbeatRequest()
{
await SendHeartbeatInternal();
}
private async Task SendHeartbeatInternal()
{
await SendHeartbeat(_lastSeq);
_lastHeartbeatSent = DateTimeOffset.UtcNow;
}
private async Task HandleHeartbeatTimer()
{
if (!_hasReceivedHeartbeatAck)
{
_logger.Warning("Shard {ShardId}: Heartbeat worker timed out", _info.ShardId);
await DoReconnect(WebSocketCloseStatus.ProtocolError, TimeSpan.Zero);
return;
}
await SendHeartbeatInternal();
}
private async Task DoReconnect(WebSocketCloseStatus closeStatus, TimeSpan delay)
{
_state = ShardState.Reconnecting;
await Reconnect(closeStatus, delay);
}
private T DeserializePayload<T>(GatewayPacket packet)
{
var packetPayload = (JsonElement) packet.Payload!;
return JsonSerializer.Deserialize<T>(packetPayload.GetRawText(), _jsonSerializerOptions)!;
}
private IGatewayEvent? DeserializeEvent(string eventType, JsonElement payload)
{
if (!IGatewayEvent.EventTypes.TryGetValue(eventType, out var clrType))
{
_logger.Debug("Shard {ShardId}: Received unknown event type {EventType}", _info.ShardId, eventType);
return null;
}
try
{
_logger.Verbose("Shard {ShardId}: Deserializing {EventType} to {ClrType}", _info.ShardId, eventType, clrType);
return JsonSerializer.Deserialize(payload.GetRawText(), clrType, _jsonSerializerOptions)
as IGatewayEvent;
}
catch (JsonException e)
{
_logger.Error(e, "Shard {ShardId}: Error deserializing event {EventType} to {ClrType}", _info.ShardId, eventType, clrType);
return null;
}
}
}
}

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@ -1,5 +1,4 @@
using System;
using System.IO;
using System.Net;
using System.Threading.Tasks;

View File

@ -69,10 +69,12 @@ namespace Myriad.Rest.Ratelimit
private void PruneStaleBuckets(DateTimeOffset now)
{
foreach (var (key, bucket) in _buckets)
if (now - bucket.LastUsed > StaleBucketTimeout)
{
_logger.Debug("Pruning unused bucket {Bucket} (last used at {BucketLastUsed})", bucket,
bucket.LastUsed);
if (now - bucket.LastUsed <= StaleBucketTimeout)
continue;
_logger.Debug("Pruning unused bucket {BucketKey}/{BucketMajor} (last used at {BucketLastUsed})",
bucket.Key, bucket.Major, bucket.LastUsed);
_buckets.TryRemove(key, out _);
}
}

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@ -1,6 +1,4 @@
using System.Collections.Generic;
namespace Myriad.Types
namespace Myriad.Types
{
public record Application: ApplicationPartial
{

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@ -1,6 +1,4 @@
using System.Collections.Generic;
namespace Myriad.Types
namespace Myriad.Types
{
public record ApplicationCommand
{

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@ -1,6 +1,4 @@
using System.Collections.Generic;
using Myriad.Rest.Types;
using Myriad.Rest.Types;
namespace Myriad.Types
{

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@ -1,6 +1,4 @@
using System.Collections.Generic;
namespace Myriad.Types
namespace Myriad.Types
{
public record Guild
{

View File

@ -1,6 +1,4 @@
using System;
using System.Collections.Generic;
using System.Net.Mail;
using System.Text.Json.Serialization;
using Myriad.Utils;

View File

@ -285,7 +285,7 @@ namespace PluralKit.Bot
{
new ActivityPartial
{
Name = $"pk;help | in {totalGuilds} servers | shard #{shard.ShardInfo?.ShardId}",
Name = $"pk;help | in {totalGuilds} servers | shard #{shard.ShardId}",
Type = ActivityType.Game,
Url = "https://pluralkit.me/"
}

View File

@ -29,8 +29,6 @@ namespace PluralKit.Bot
private readonly MessageCreateEvent _message;
private readonly Parameters _parameters;
private readonly MessageContext _messageContext;
private readonly PermissionSet _botPermissions;
private readonly PermissionSet _userPermissions;
private readonly IDatabase _db;
private readonly ModelRepository _repo;
@ -42,7 +40,7 @@ namespace PluralKit.Bot
private Command _currentCommand;
public Context(ILifetimeScope provider, Shard shard, Guild? guild, Channel channel, MessageCreateEvent message, int commandParseOffset,
PKSystem senderSystem, MessageContext messageContext, PermissionSet botPermissions)
PKSystem senderSystem, MessageContext messageContext)
{
_message = message;
_shard = shard;
@ -59,9 +57,6 @@ namespace PluralKit.Bot
_parameters = new Parameters(message.Content?.Substring(commandParseOffset));
_rest = provider.Resolve<DiscordApiClient>();
_cluster = provider.Resolve<Cluster>();
_botPermissions = botPermissions;
_userPermissions = _cache.PermissionsFor(message);
}
public IDiscordCache Cache => _cache;
@ -76,8 +71,8 @@ namespace PluralKit.Bot
public Cluster Cluster => _cluster;
public MessageContext MessageContext => _messageContext;
public PermissionSet BotPermissions => _botPermissions;
public PermissionSet UserPermissions => _userPermissions;
public PermissionSet BotPermissions => _provider.Resolve<Bot>().PermissionsIn(_channel.Id);
public PermissionSet UserPermissions => _cache.PermissionsFor(_message);
public DiscordApiClient Rest => _rest;

View File

@ -84,7 +84,7 @@ namespace PluralKit.Bot {
var totalSwitches = _metrics.Snapshot.GetForContext("Application").Gauges.FirstOrDefault(m => m.MultidimensionalName == CoreMetrics.SwitchCount.Name)?.Value ?? 0;
var totalMessages = _metrics.Snapshot.GetForContext("Application").Gauges.FirstOrDefault(m => m.MultidimensionalName == CoreMetrics.MessageCount.Name)?.Value ?? 0;
var shardId = ctx.Shard.ShardInfo.ShardId;
var shardId = ctx.Shard.ShardId;
var shardTotal = ctx.Cluster.Shards.Count;
var shardUpTotal = _shards.Shards.Where(x => x.Connected).Count();
var shardInfo = _shards.GetShardInfo(ctx.Shard);

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@ -114,7 +114,7 @@ namespace PluralKit.Bot
try
{
var system = ctx.SystemId != null ? await _db.Execute(c => _repo.GetSystem(c, ctx.SystemId.Value)) : null;
await _tree.ExecuteCommand(new Context(_services, shard, guild, channel, evt, cmdStart, system, ctx, _bot.PermissionsIn(channel.Id)));
await _tree.ExecuteCommand(new Context(_services, shard, guild, channel, evt, cmdStart, system, ctx));
}
catch (PKError)
{

View File

@ -49,7 +49,7 @@ namespace PluralKit.Bot
// Start the Discord shards themselves (handlers already set up)
logger.Information("Connecting to Discord");
var info = await services.Resolve<DiscordApiClient>().GetGatewayBot();
await services.Resolve<Cluster>().Start(info);
await services.Resolve<Cluster>().Start(info with { Shards = 10 });
logger.Information("Connected! All is good (probably).");
// Lastly, we just... wait. Everything else is handled in the DiscordClient event loop

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@ -2,7 +2,6 @@ using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.WebSockets;
using System.Threading.Tasks;
using App.Metrics;
@ -66,11 +65,8 @@ namespace PluralKit.Bot
} else _shardInfo[shard.ShardId] = info = new ShardInfo();
// Call our own SocketOpened listener manually (and then attach the listener properly)
SocketOpened(shard);
shard.SocketOpened += () => SocketOpened(shard);
// Register listeners for new shards
_logger.Information("Attaching listeners to new shard #{Shard}", shard.ShardId);
shard.Resumed += () => Resumed(shard);
shard.Ready += () => Ready(shard);
shard.SocketClosed += (closeStatus, message) => SocketClosed(shard, closeStatus, message);
@ -78,14 +74,6 @@ namespace PluralKit.Bot
// Register that we've seen it
info.HasAttachedListeners = true;
}
private void SocketOpened(Shard shard)
{
// We do nothing else here, since this kinda doesn't mean *much*? It's only really started once we get Ready/Resumed
// And it doesn't get fired first time around since we don't have time to add the event listener before it's fired'
_logger.Information("Shard #{Shard} opened socket", shard.ShardId);
}
private ShardInfo TryGetShard(Shard shard)
@ -100,29 +88,22 @@ namespace PluralKit.Bot
private void Resumed(Shard shard)
{
_logger.Information("Shard #{Shard} resumed connection", shard.ShardId);
var info = TryGetShard(shard);
// info.LastConnectionTime = SystemClock.Instance.GetCurrentInstant();
info.Connected = true;
ReportShardStatus();
}
private void Ready(Shard shard)
{
_logger.Information("Shard #{Shard} sent Ready event", shard.ShardId);
var info = TryGetShard(shard);
info.LastConnectionTime = SystemClock.Instance.GetCurrentInstant();
info.Connected = true;
ReportShardStatus();
}
private void SocketClosed(Shard shard, WebSocketCloseStatus closeStatus, string message)
private void Ready(Shard shard)
{
_logger.Warning("Shard #{Shard} disconnected ({CloseCode}: {CloseMessage})",
shard.ShardId, closeStatus, message);
var info = TryGetShard(shard);
info.LastConnectionTime = SystemClock.Instance.GetCurrentInstant();
info.Connected = true;
ReportShardStatus();
}
private void SocketClosed(Shard shard, WebSocketCloseStatus? closeStatus, string message)
{
var info = TryGetShard(shard);
info.DisconnectionCount++;
info.Connected = false;
@ -131,9 +112,6 @@ namespace PluralKit.Bot
private void Heartbeated(Shard shard, TimeSpan latency)
{
_logger.Information("Shard #{Shard} received heartbeat (latency: {Latency} ms)",
shard.ShardId, latency.Milliseconds);
var info = TryGetShard(shard);
info.LastHeartbeatTime = SystemClock.Instance.GetCurrentInstant();
info.Connected = true;

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@ -155,6 +155,7 @@ namespace PluralKit.Bot {
// "escape hatch", clean up as if we hit X
}
// todo: re-check
if (ctx.BotPermissions.HasFlag(PermissionSet.ManageMessages))
await ctx.Rest.DeleteAllReactions(msg.ChannelId, msg.Id);
}

View File

@ -38,7 +38,7 @@ namespace PluralKit.Bot
{"guild", evt.GuildId.ToString()},
{"message", evt.Id.ToString()},
});
scope.SetTag("shard", shard.ShardInfo.ShardId.ToString());
scope.SetTag("shard", shard.ShardId.ToString());
// Also report information about the bot's permissions in the channel
// We get a lot of permission errors so this'll be useful for determining problems
@ -55,7 +55,7 @@ namespace PluralKit.Bot
{"guild", evt.GuildId.ToString()},
{"message", evt.Id.ToString()},
});
scope.SetTag("shard", shard.ShardInfo.ShardId.ToString());
scope.SetTag("shard", shard.ShardId.ToString());
}
public void Enrich(Scope scope, Shard shard, MessageUpdateEvent evt)
@ -67,7 +67,7 @@ namespace PluralKit.Bot
{"guild", evt.GuildId.Value.ToString()},
{"message", evt.Id.ToString()}
});
scope.SetTag("shard", shard.ShardInfo.ShardId.ToString());
scope.SetTag("shard", shard.ShardId.ToString());
}
public void Enrich(Scope scope, Shard shard, MessageDeleteBulkEvent evt)
@ -79,7 +79,7 @@ namespace PluralKit.Bot
{"guild", evt.GuildId.ToString()},
{"messages", string.Join(",", evt.Ids)},
});
scope.SetTag("shard", shard.ShardInfo.ShardId.ToString());
scope.SetTag("shard", shard.ShardId.ToString());
}
public void Enrich(Scope scope, Shard shard, MessageReactionAddEvent evt)
@ -93,7 +93,7 @@ namespace PluralKit.Bot
{"message", evt.MessageId.ToString()},
{"reaction", evt.Emoji.Name}
});
scope.SetTag("shard", shard.ShardInfo.ShardId.ToString());
scope.SetTag("shard", shard.ShardId.ToString());
}
}
}