/// <summary>
/// <para>Client performs an initial HTTP POST to obtain a SessionId (sid) assigned to a client, followed
/// by the heartbeat timeout, connection closing timeout, and the list of supported transports.</para>
/// <para>The tansport and sid are required as part of the ws: transport connection</para>
/// </summary>
/// <param name="uri">http://localhost:3000</param>
/// <returns>Handshake object with sid value</returns>
/// <example>DownloadString: 13052140081337757257:15:25:websocket,htmlfile,xhr-polling,jsonp-polling</example>
protected SocketIOHandshake requestHandshake(Uri uri)
{
string value = string.Empty;
string errorText = string.Empty;
SocketIOHandshake handshake = null;
using (WebClient client = new WebClient())
{
try
{
value = client.DownloadString(string.Format("{0}://{1}:{2}/socket.io/1/{3}", uri.Scheme, uri.Host, uri.Port, uri.Query)); // #5 tkiley: The uri.Query is available in socket.io's handshakeData object during authorization
// 13052140081337757257:15:25:websocket,htmlfile,xhr-polling,jsonp-polling
if (string.IsNullOrEmpty(value))
{
errorText = "Did not receive handshake string from server";
}
}
catch (Exception ex)
{
errorText = string.Format("Error getting handsake from Socket.IO host instance: {0}", ex.Message);
//this.OnErrorEvent(this, new ErrorEventArgs(errMsg));
}
}
if (string.IsNullOrEmpty(errorText))
{
handshake = SocketIOHandshake.LoadFromString(value);
}
else
{
handshake = new SocketIOHandshake();
handshake.ErrorMessage = errorText;
}
return(handshake);
}
public static SocketIOHandshake LoadFromString(string value)
{
SocketIOHandshake returnItem = new SocketIOHandshake();
if (!string.IsNullOrEmpty(value))
{
string[] items = value.Split(new char[] { ':' });
if (items.Count() == 4)
{
int hb = 0;
int ct = 0;
returnItem.SID = items[0];
if (int.TryParse(items[1], out hb))
{
var pct = (int)(hb * .75); // setup client time to occure 25% faster than needed
returnItem.HeartbeatTimeout = pct;
}
if (int.TryParse(items[2], out ct))
{
returnItem.ConnectionTimeout = ct;
}
returnItem.Transports.AddRange(items[3].Split(new char[] { ',' }));
return(returnItem);
}
}
return(null);
}
