private async void BackgroundTaskEntryPoint()
{
while (!this.cancellationTokenSource.IsCancellationRequested)
{
PlcClient client = null;
try
{
client = await this.plcServer.AcceptAsync().ConfigureAwait(false);
this.logger.LogInformation("TCP connection established from {0}", client.RemoteEndPoint);
}
catch (SocketException e)
{
this.logger.LogError(e, "Failed to TCP accept PLC.");
continue;
}
catch (ObjectDisposedException)
{
// Ignore it.
break;
}
ConnectResponse response;
try
{
response = await client
.ConnectAsync(new ConnectRequest(), DateTime.UtcNow.AddSeconds(10))
.ConfigureAwait(false);
this.logger.LogInformation(
"ConnectResponse received from newly PLC {0}: {1}",
client.RemoteEndPoint,
response);
}
catch (RpcException e)
{
this.logger.LogWarning(
e,
"Failed to send ConnectRequest to newly PLC {0}, hang up.",
client.RemoteEndPoint);
await client.Close().ConfigureAwait(false);
client.Dispose();
continue;
}
client.OnClosed += (sender, args) =>
{
this.logger.LogInformation(
"Client(MAC={0}, EndPoint={1}) disconnected.",
BitConverter.ToString(response.Id.ToByteArray()),
client.RemoteEndPoint);
this.PlcDictionary.TryRemove(response.Id, out PlcClient _);
};
if (this.PlcDictionary.TryAdd(response.Id, client))
{
this.logger.LogInformation(
"Client(MAC={0}, EndPoint={1}) connected.",
BitConverter.ToString(response.Id.ToByteArray()),
client.RemoteEndPoint);
}
else
{
this.logger.LogWarning(
"Failed to add the client(MAC={0}, EndPoint={1}) into dictionary.",
BitConverter.ToString(response.Id.ToByteArray()),
client.RemoteEndPoint);
await client.Close().ConfigureAwait(false);
client.Dispose();
}
}
}
private async void BackgroundTaskEntryPoint()
{
while (!this.cancellationTokenSource.IsCancellationRequested)
{
PlcClient client = await this.plcServer.AcceptAsync().ConfigureAwait(false);
client.OnClosed += (sender, _) =>
{
var c = (PlcClient)sender;
lock (this.lockObject)
{
this.clients.Remove(c);
}
this.Dispatcher.Invoke(() =>
{
this.LogMessage(string.Format(
CultureInfo.CurrentCulture,
"PLC {0} 已断开连接。",
c.RemoteEndPoint));
});
};
lock (this.lockObject)
{
if (this.clients.Count == 0)
{
client.OnDebugSending += (sender, bytes) =>
{
this.Dispatcher.Invoke(() =>
{
this.SendingDocument.Blocks.Clear();
this.SendingDocument.Blocks.Add(new Paragraph(new Run(HexUtils.Dump(
bytes, bytesPerLine: 4, showHeader: false))));
});
};
client.OnDebugReceiving += (sender, bytes) =>
{
this.Dispatcher.Invoke(() =>
{
this.ReceivingDocument.Blocks.Clear();
this.ReceivingDocument.Blocks.Add(new Paragraph(new Run(HexUtils.Dump(
bytes, bytesPerLine: 4, showHeader: false))));
});
};
this.clients.Add(client);
}
else
{
this.Dispatcher.Invoke(() =>
{
this.LogMessage("测试程序只允许一台 PLC 连接。");
});
client.Close().ConfigureAwait(false).GetAwaiter().GetResult();
}
}
this.Dispatcher.Invoke(() =>
{
this.LogMessage(string.Format(
CultureInfo.CurrentCulture,
"PLC {0} 已连接，点击按钮向 PLC 发送消息，鼠标悬停在按钮上有相关说明。",
client.RemoteEndPoint));
});
}
}
