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Code Issues Releases Wiki Activity

Rewrite connection logic to better handle failure cases

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The main goal here is to ensure the connection is built each connection
attempt. Previously, the access token would never be updated, leading to
outdated tokens failing repeatedly (in the connection retry loop) and
never being able to establish a new connection as a result.

Due to threading considerations, this isn't as simple as I would hope it
to be. I'm open to proposals as to a better way of handling this.

Also, keep in mind that this logic will need to be abstracted and
(re)used in `SpectatorClient` as well. I've intentionally not done that
yet until we agree that this is a good direction forward.
This commit is contained in:
Dean Herbert 2021-01-22 14:25:21 +09:00
parent 1ae3f1b9eb
commit 9f89b4e6d7
1 changed files with 93 additions and 48 deletions
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141
osu.Game/Online/Multiplayer/MultiplayerClient.cs
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@ -4,7 +4,6 @@
#nullable enable
using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.SignalR.Client;
@ -30,6 +29,8 @@ namespace osu.Game.Online.Multiplayer
private HubConnection? connection;
private CancellationTokenSource connectCancelSource = new CancellationTokenSource();
private readonly string endpoint;
public MultiplayerClient(EndpointConfiguration endpoints)
@ -50,8 +51,7 @@ namespace osu.Game.Online.Multiplayer
{
case APIState.Failing:
case APIState.Offline:
connection?.StopAsync();
connection = null;
Task.Run(Disconnect);
break;
case APIState.Online:
@ -60,70 +60,57 @@ namespace osu.Game.Online.Multiplayer
}
}
protected virtual async Task Connect()
private readonly SemaphoreSlim connectionLock = new SemaphoreSlim(1);
public Task Disconnect() => disconnect(true);
protected async Task Connect()
{
if (connection != null)
return;
cancelExistingConnect();
connection = new HubConnectionBuilder()
.WithUrl(endpoint, options =>
{
options.Headers.Add("Authorization", $"Bearer {api.AccessToken}");
})
.AddNewtonsoftJsonProtocol(options => { options.PayloadSerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore; })
.Build();
await connectionLock.WaitAsync();
// this is kind of SILLY
// https://github.com/dotnet/aspnetcore/issues/15198
connection.On<MultiplayerRoomState>(nameof(IMultiplayerClient.RoomStateChanged), ((IMultiplayerClient)this).RoomStateChanged);
connection.On<MultiplayerRoomUser>(nameof(IMultiplayerClient.UserJoined), ((IMultiplayerClient)this).UserJoined);
connection.On<MultiplayerRoomUser>(nameof(IMultiplayerClient.UserLeft), ((IMultiplayerClient)this).UserLeft);
connection.On<int>(nameof(IMultiplayerClient.HostChanged), ((IMultiplayerClient)this).HostChanged);
connection.On<MultiplayerRoomSettings>(nameof(IMultiplayerClient.SettingsChanged), ((IMultiplayerClient)this).SettingsChanged);
connection.On<int, MultiplayerUserState>(nameof(IMultiplayerClient.UserStateChanged), ((IMultiplayerClient)this).UserStateChanged);
connection.On(nameof(IMultiplayerClient.LoadRequested), ((IMultiplayerClient)this).LoadRequested);
connection.On(nameof(IMultiplayerClient.MatchStarted), ((IMultiplayerClient)this).MatchStarted);
connection.On(nameof(IMultiplayerClient.ResultsReady), ((IMultiplayerClient)this).ResultsReady);
connection.Closed += async ex =>
try
{
isConnected.Value = false;
await disconnect(false);
Logger.Log(ex != null
? $"Multiplayer client lost connection: {ex}"
: "Multiplayer client disconnected", LoggingTarget.Network);
// this token will be valid for the scope of this connection.
// if cancelled, we can be sure that a disconnect or reconnect is handled elsewhere.
var cancellationToken = connectCancelSource.Token;
if (connection != null)
await tryUntilConnected();
};
await tryUntilConnected();
async Task tryUntilConnected()
{
Logger.Log("Multiplayer client connecting...", LoggingTarget.Network);
while (api.State.Value == APIState.Online)
while (api.State.Value == APIState.Online && !cancellationToken.IsCancellationRequested)
{
Logger.Log("Multiplayer client connecting...", LoggingTarget.Network);
try
{
Debug.Assert(connection != null);
// importantly, rebuild the connection each attempt to get an updated access token.
connection = createConnection(cancellationToken);
await connection.StartAsync(cancellationToken);
// reconnect on any failure
await connection.StartAsync();
Logger.Log("Multiplayer client connected!", LoggingTarget.Network);
// Success.
isConnected.Value = true;
break;
return;
}
catch (OperationCanceledException)
{
//connection process was cancelled.
return;
}
catch (Exception e)
{
Logger.Log($"Multiplayer client connection error: {e}", LoggingTarget.Network);
await Task.Delay(5000);
// retry on any failure.
await Task.Delay(5000, cancellationToken);
}
}
}
finally
{
connectionLock.Release();
}
}
protected override Task<MultiplayerRoom> JoinRoom(long roomId)
@ -189,5 +176,63 @@ namespace osu.Game.Online.Multiplayer
return connection.InvokeAsync(nameof(IMultiplayerServer.StartMatch));
}
private async Task disconnect(bool takeLock)
{
cancelExistingConnect();
if (takeLock)
await connectionLock.WaitAsync();
try
{
if (connection != null)
await connection.StopAsync();
}
finally
{
connection = null;
if (takeLock)
connectionLock.Release();
}
}
private void cancelExistingConnect()
{
connectCancelSource.Cancel();
connectCancelSource = new CancellationTokenSource();
}
private HubConnection createConnection(CancellationToken cancellationToken)
{
var newConnection = new HubConnectionBuilder()
.WithUrl(endpoint, options => { options.Headers.Add("Authorization", $"Bearer {api.AccessToken}"); })
.AddNewtonsoftJsonProtocol(options => { options.PayloadSerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore; })
.Build();
// this is kind of SILLY
// https://github.com/dotnet/aspnetcore/issues/15198
newConnection.On<MultiplayerRoomState>(nameof(IMultiplayerClient.RoomStateChanged), ((IMultiplayerClient)this).RoomStateChanged);
newConnection.On<MultiplayerRoomUser>(nameof(IMultiplayerClient.UserJoined), ((IMultiplayerClient)this).UserJoined);
newConnection.On<MultiplayerRoomUser>(nameof(IMultiplayerClient.UserLeft), ((IMultiplayerClient)this).UserLeft);
newConnection.On<int>(nameof(IMultiplayerClient.HostChanged), ((IMultiplayerClient)this).HostChanged);
newConnection.On<MultiplayerRoomSettings>(nameof(IMultiplayerClient.SettingsChanged), ((IMultiplayerClient)this).SettingsChanged);
newConnection.On<int, MultiplayerUserState>(nameof(IMultiplayerClient.UserStateChanged), ((IMultiplayerClient)this).UserStateChanged);
newConnection.On(nameof(IMultiplayerClient.LoadRequested), ((IMultiplayerClient)this).LoadRequested);
newConnection.On(nameof(IMultiplayerClient.MatchStarted), ((IMultiplayerClient)this).MatchStarted);
newConnection.On(nameof(IMultiplayerClient.ResultsReady), ((IMultiplayerClient)this).ResultsReady);
newConnection.Closed += async ex =>
{
isConnected.Value = false;
Logger.Log(ex != null ? $"Multiplayer client lost connection: {ex}" : "Multiplayer client disconnected", LoggingTarget.Network);
// make sure a disconnect wasn't triggered (and this is still the active connection).
if (!cancellationToken.IsCancellationRequested)
await Connect();
};
return newConnection;
}
}
}