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Fixed a race condition in client and server.

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This commit is contained in:
Christian
2018-03-31 23:10:14 +02:00
parent cea984cc2f
commit 8f96acaec4
14 changed files with 224 additions and 127 deletions
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Frameworks/MQTTnet.NetStandard/Adapter/MqttChannelAdapter.cs
+38 -1
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@@ -14,11 +14,12 @@ using MQTTnet.Serializer;
namespace MQTTnet.Adapter
{
public class MqttChannelAdapter : IMqttChannelAdapter
public sealed class MqttChannelAdapter : IMqttChannelAdapter
{
private const uint ErrorOperationAborted = 0x800703E3;
private const int ReadBufferSize = 4096; // TODO: Move buffer size to config
private bool _isDisposed;
private readonly SemaphoreSlim _semaphore = new SemaphoreSlim(1, 1);
private readonly IMqttNetLogger _logger;
private readonly IMqttChannel _channel;
@@ -34,6 +35,7 @@ namespace MQTTnet.Adapter
public Task ConnectAsync(TimeSpan timeout)
{
ThrowIfDisposed();
_logger.Trace<MqttChannelAdapter>("Connecting [Timeout={0}]", timeout);
return ExecuteAndWrapExceptionAsync(() => _channel.ConnectAsync().TimeoutAfter(timeout));
@@ -41,6 +43,7 @@ namespace MQTTnet.Adapter
public Task DisconnectAsync(TimeSpan timeout)
{
ThrowIfDisposed();
_logger.Trace<MqttChannelAdapter>("Disconnecting [Timeout={0}]", timeout);
return ExecuteAndWrapExceptionAsync(() => _channel.DisconnectAsync().TimeoutAfter(timeout));
@@ -48,6 +51,8 @@ namespace MQTTnet.Adapter
public Task SendPacketsAsync(TimeSpan timeout, CancellationToken cancellationToken, IEnumerable<MqttBasePacket> packets)
{
ThrowIfDisposed();
return ExecuteAndWrapExceptionAsync(async () =>
{
await _semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
@@ -55,6 +60,11 @@ namespace MQTTnet.Adapter
{
foreach (var packet in packets)
{
if (cancellationToken.IsCancellationRequested)
{
return;
}
if (packet == null)
{
continue;
@@ -65,10 +75,20 @@ namespace MQTTnet.Adapter
var chunks = PacketSerializer.Serialize(packet);
foreach (var chunk in chunks)
{
if (cancellationToken.IsCancellationRequested)
{
return;
}
await _channel.SendStream.WriteAsync(chunk.Array, chunk.Offset, chunk.Count, cancellationToken).ConfigureAwait(false);
}
}
if (cancellationToken.IsCancellationRequested)
{
return;
}
if (timeout > TimeSpan.Zero)
{
await _channel.SendStream.FlushAsync(cancellationToken).TimeoutAfter(timeout).ConfigureAwait(false);
@@ -87,6 +107,8 @@ namespace MQTTnet.Adapter
public async Task<MqttBasePacket> ReceivePacketAsync(TimeSpan timeout, CancellationToken cancellationToken)
{
ThrowIfDisposed();
MqttBasePacket packet = null;
await ExecuteAndWrapExceptionAsync(async () =>
{
@@ -214,5 +236,20 @@ namespace MQTTnet.Adapter
throw new MqttCommunicationException(exception);
}
}
public void Dispose()
{
_isDisposed = true;
_semaphore?.Dispose();
_channel?.Dispose();
}
private void ThrowIfDisposed()
{
if (_isDisposed)
{
throw new ObjectDisposedException(nameof(MqttChannelAdapter));
}
}
}
}