private async Task ReceiveMessagesAsync(
CancellationToken cancellationToken)
{
using (var combined = CancellationTokenSource
.CreateLinkedTokenSource(cancellationToken, _cts.Token))
{
while (!_context.CloseStatus.HasValue ||
!combined.IsCancellationRequested)
{
GenericOperationMessage message = await _context
.ReceiveMessageAsync(combined.Token);
if (message == null)
{
await _context.SendConnectionKeepAliveMessageAsync(
combined.Token).ConfigureAwait(false);
}
else
{
await HandleMessage(message, combined.Token)
.ConfigureAwait(false);
}
}
}
}
public async Task HandleAsync(
IWebSocketContext context,
GenericOperationMessage message,
CancellationToken cancellationToken)
{
ConnectionStatus connectionStatus =
await context.OpenAsync(message.Payload.ToDictionary())
.ConfigureAwait(false);
if (connectionStatus.Accepted)
{
await context.SendConnectionAcceptMessageAsync(
cancellationToken).ConfigureAwait(false);
await context.SendConnectionKeepAliveMessageAsync(
cancellationToken).ConfigureAwait(false);
}
else
{
await context.SendConnectionErrorMessageAsync(
connectionStatus.Response, cancellationToken)
.ConfigureAwait(false);
await context.CloseAsync().ConfigureAwait(false);
}
}
public async Task HandleAsync(
IWebSocketContext context,
GenericOperationMessage message,
CancellationToken cancellationToken)
{
await context.SendConnectionAcceptMessageAsync(
cancellationToken);
await context.SendConnectionKeepAliveMessageAsync(
cancellationToken);
}
private async Task KeepConnectionAliveAsync()
{
while (!_context.Closed || !_cts.IsCancellationRequested)
{
await Task.Delay(_timeout, _cts.Token)
.ConfigureAwait(false);
await _context
.SendConnectionKeepAliveMessageAsync(_cts.Token)
.ConfigureAwait(false);
}
}
internal async Task ProcessMessageAsync(
ReadOnlySequence <byte> slice,
CancellationToken cancellationToken)
{
using (var combined = CancellationTokenSource
.CreateLinkedTokenSource(cancellationToken, _cts.Token))
{
string json = Encoding.UTF8.GetString(slice.ToArray());
if (!string.IsNullOrEmpty(json.Trim()))
{
await HandleMessageAsync(json, combined.Token)
.ConfigureAwait(false);
}
else
{
await _context
.SendConnectionKeepAliveMessageAsync(combined.Token)
.ConfigureAwait(false);
}
}
}