void Subscribe(IReader <IMessageIn> reader, IWriter <IMessageOut> writer, IMessageOut req, bool consumeFirst)
{
writer.Send(req);
string channel = WebSocket.Channels.FromMessage(req);
var deadline = DateTime.UtcNow + SubscribeTimeout;
while (true)
{
TimestampedMsg <IMessageIn> resp;
if (!reader.PeekWithTimeout(DateTime.UtcNow - deadline, out resp))
{
throw new Exception(String.Format(
"Timed out waiting for response to our subscription request: ({0}) {1}", req.GetType(), req));
}
if (channel == WebSocket.Channels.FromMessage(resp.Value))
{
if (resp.Value.Error.HasValue)
{
throw new Exception(String.Format(
"Exchange returned error to our subscription request. Request: ({0}) {1}. Response: ({2}) {3}",
req.GetType(), req, resp.Value.GetType(), resp.Value));
}
if (consumeFirst)
{
reader.Consume();
}
break;
}
reader.Skip();
}
}
// `param` may be null (means empty).
string AuthenticatedRequest(IMessageOut msg, IEnumerable <KV> param)
{
param = param ?? new KV[0];
param = param.Append(new KV("api_key", _keys.ApiKey));
// Signature is added last because its value depends on all other parameters.
param = param.Append(new KV("sign", Authenticator.Sign(_keys, param)));
string parameters = String.Join(",", param.Select(kv => String.Format("\"{0}\":\"{1}\"", kv.Key, kv.Value)));
return(String.Format("{{\"event\":\"addChannel\",\"channel\":\"{0}\",\"parameters\":{{{1}}}}}",
Channels.FromMessage(msg), parameters));
}
// Action `done` will be called exactly once in the scheduler. Its argument will be null on timeout.
public void Send(IMessageOut msg, Action <TimestampedMsg <IMessageIn> > done)
{
Condition.Requires(msg, "msg").IsNotNull();
Condition.Requires(done, "done").IsNotNull();
string channel = Channels.FromMessage(msg);
Turnstile <IMessageIn, IMessageOut> turnstile;
lock (_monitor)
{
if (!_channels.TryGetValue(channel, out turnstile))
{
turnstile = new Turnstile <IMessageIn, IMessageOut>(_connection);
_channels.Add(channel, turnstile);
}
}
turnstile.Send(msg, done);
}
string UnauthenticatedRequest(IMessageOut msg)
{
// Example: {"event":"addChannel","channel":"ok_btcusd_future_depth_this_week_60"}.
return(String.Format("{{\"event\":\"addChannel\",\"channel\":\"{0}\"}}",
Channels.FromMessage(msg)));
}
public ZipArchive(IMessageOut messageOut)
{
_messageOut = messageOut;
}
public static string FromMessage(IMessageOut msg)
{
return(msg.Visit(new MessageChannel()));
}
