private async Task SubscribeAndListenImplAsync(CancellationToken cancellationToken, string requestString)
{
await _clientWebSocket.SendAsync(StringToArraySegment(requestString), WebSocketMessageType.Text,
true, cancellationToken).ConfigureAwait(false);
await Subscribed.NullableInvokeAsync(this, requestString);
await ListenToMessagesAsync(_clientWebSocket, cancellationToken);
}
public async Task CloseConnectionAsync(CancellationToken cancellationToken)
{
if (_clientWebSocket != null && _clientWebSocket.State == WebSocketState.Open)
{
await _clientWebSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "Normal closure", cancellationToken);
await Disconnected.NullableInvokeAsync(this, BaseUri);
}
}
private async Task HandleWebSocketMessageAsync(string jsonMessage)
{
var jToken = JToken.Parse(jsonMessage);
var type = jToken["type"]?.Value <string>();
switch (type)
{
case "received":
var orderReceived = JsonConvert.DeserializeObject <GdaxWssOrderReceived>(jsonMessage);
await OrderReceived.NullableInvokeAsync(this, orderReceived);
break;
case "open":
var orderOpen = JsonConvert.DeserializeObject <GdaxWssOrderOpen>(jsonMessage);
await OrderOpened.NullableInvokeAsync(this, orderOpen);
break;
case "done":
var orderDone = JsonConvert.DeserializeObject <GdaxWssOrderDone>(jsonMessage);
await OrderDone.NullableInvokeAsync(this, orderDone);
break;
case "match":
var orderMatch = JsonConvert.DeserializeObject <GdaxWssOrderMatch>(jsonMessage);
await OrderMatched.NullableInvokeAsync(this, orderMatch);
break;
case "change":
var orderChange = JsonConvert.DeserializeObject <GdaxWssOrderChange>(jsonMessage);
await OrderChanged.NullableInvokeAsync(this, orderChange);
break;
case "ticker":
var tickerDetails = JsonConvert.DeserializeObject <GdaxWssTicker>(jsonMessage);
await Ticker.NullableInvokeAsync(this, tickerDetails);
break;
case "error":
var error = JsonConvert.DeserializeObject <GdaxWssError>(jsonMessage);
await Error.NullableInvokeAsync(this, error);
break;
default:
// Clients are expected to ignore messages they do not support.
break;
}
}
public async Task ConnectAsync(CancellationToken cancellationToken)
{
await _logger.WriteInfoAsync(nameof(GdaxWebSocketApi), nameof(ConnectAsync), BaseUri.ToString(),
"Attempt to establish a socket connection");
_clientWebSocket = new ClientWebSocket();
await _clientWebSocket.ConnectAsync(BaseUri, cancellationToken).ConfigureAwait(false);
if (_clientWebSocket.State != WebSocketState.Open)
{
throw new ApiException($"Could not establish WebSockets connection to {BaseUri}");
}
await Connected.NullableInvokeAsync(this, BaseUri);
}