/// <summary>
/// Init constructor.
/// </summary>
public BayeuxException(string message, BayeuxRequest request, BayeuxResponse response, IJSonObject responseObject)
: base(message)
{
Request = request;
Response = response;
JSonResponse = responseObject;
}
/// <summary>
/// Process given response. Request is also provided.
/// The default behavior is that it only passes response to request, however there might be
/// a situation, when no request was given (when a 'text' message has been sent).
/// Returning 'true' as a result will filter out the ResponseReceived event.
/// </summary>
protected virtual bool ProcessResponse(BayeuxRequest request, BayeuxResponse response)
{
if (request != null)
request.ProcessResponse(response);
else
{
DebugLog.WriteBayeuxLine("BayeuxConnection: Processing response ignored for null request!");
}
return false;
}
private void ProcessResponseMessage(BayeuxRequest request, HttpStatusCode httpStatusCode, string httpStatusDescription, IJSonObject message, string rawMessage)
{
try
{
string channel = message["channel"].StringValue; // each Bayuex message must have a channel associated!
BayeuxResponse response = null;
if (string.IsNullOrEmpty(channel))
throw new BayeuxException("Unexpected message with empty channel!");
if (request != null && (channel.StartsWith("/meta", StringComparison.Ordinal) && channel != request.Channel))
throw new BayeuxException(string.Format(CultureInfo.InvariantCulture, "Unexpected response with channel: '{0}'", channel), request, null, message);
if (request != null && channel.StartsWith("/meta", StringComparison.Ordinal) && request.ID != message["id"].StringValue)
throw new BayeuxException(string.Format(CultureInfo.InvariantCulture, "Invalid response ID, current: '{0}', expected: '{1}'", request.ID, message["id"].StringValue), request, null,
message);
///////////////////////////////////////////////////////////////////////////////////////////
// identify meta messages:
if (channel == HandshakeRequest.MetaChannel)
{
var handshakeResponse = new HandshakeResponse(message);
response = handshakeResponse;
// inform, that connection succeeded:
if (handshakeResponse.Successful)
{
ClientID = response.ClientID;
if (string.IsNullOrEmpty(ClientID))
{
throw new BayeuxException("Invalid ClientID received from server", request, handshakeResponse, message);
}
OnConnected(new BayeuxConnectionEventArgs(this, httpStatusCode, httpStatusDescription, rawMessage, message, handshakeResponse));
}
else
{
// inform that Handshake failed, via dedicated event:
ClientID = null;
OnConnectionFailed(new BayeuxConnectionEventArgs(this, response.Successful ? HttpStatusCode.OK : HttpStatusCode.BadRequest, null, rawMessage, message, response));
}
}
if (channel == DisconnectRequest.MetaChannel)
{
response = new BayeuxResponse(message);
// inform that disconnection succeeded:
_state = BayeuxConnectionState.Disconnected;
ClientID = null;
OnDisconnected(new BayeuxConnectionEventArgs(this, response.Successful ? HttpStatusCode.OK : HttpStatusCode.BadRequest, null, rawMessage, message, response));
}
if (channel == SubscribeRequest.MetaChannel)
{
var subscribeResponse = new SubscribeResponse(message);
response = subscribeResponse;
if (subscribeResponse.Successful)
_subscribedChannels.Add(subscribeResponse.SubscriptionChannel);
}
if (channel == UnsubscribeRequest.MetaChannel)
{
var unsubscribeResponse = new UnsubscribeResponse(message);
response = unsubscribeResponse;
if (unsubscribeResponse.Successful)
_subscribedChannels.Remove(unsubscribeResponse.SubscriptionChannel);
}
if (_subscribedChannels.Contains(channel))
{
response = new BayeuxResponse(message);
// event from server:
OnEventReceived(new BayeuxConnectionEventArgs(this, httpStatusCode, httpStatusDescription, rawMessage, message, response));
}
// process generic response:
if (response == null)
response = ProvideResponse(message);
// allow filtering of ResponseReceived event:
if (ProcessResponse(request, response))
return;
// one place to process all responses:
OnResponseReceived(new BayeuxConnectionEventArgs(this, httpStatusCode, httpStatusDescription, rawMessage, message, response));
}
catch (Exception ex)
{
DebugLog.WriteBayeuxException(ex);
string statusDescription = string.Concat(httpStatusDescription, "; unexpected exception: \"", ex.Message, "\"");
OnDataFailed(new BayeuxConnectionEventArgs(this, httpStatusCode, statusDescription, rawMessage, message));
}
}
/// <summary>
/// Sends bayeux message.
/// </summary>
protected void SendRequest(BayeuxRequest message, bool asynchronous)
{
Send(message, null, asynchronous);
}
/// <summary>
/// Converts <see cref="BayeuxRequest"/> to string containing its JSON representation.
/// </summary>
protected string SerializeRequest(BayeuxRequest request)
{
_writerCache.Remove(0, _writerCache.Length);
_jsonWriter.WriteArrayBegin();
request.Write(_jsonWriter);
_jsonWriter.WriteArrayEnd();
return _jsonWriter.ToString();
}
/// <summary>
/// Sends a bayeux message to the server with the ability to override the JSON returned by request object itself
/// with the one specified as raw JSON data.
/// </summary>
public void Send(BayeuxRequest message, string overrideWithJSonData, bool asynchronous)
{
if (message == null)
throw new ArgumentNullException("message");
string dataToSend = overrideWithJSonData;
lock (_syncObject)
{
if (_request != null)
{
if (_httpConnection.IsActive)
_httpConnection.Cancel(); // this is a sync operation, which should cause the _request to be nulled ...
_request = null;
}
if (_request != null)
throw new InvalidOperationException("Can't start new request, when current has not been finished/cancelled");
if (string.IsNullOrEmpty(message.ClientID))
message.ClientID = ClientID;
_request = message;
// serialize JSON data as text message if not provided as parameter:
if (string.IsNullOrEmpty(overrideWithJSonData))
dataToSend = SerializeRequest(message);
}
if (asynchronous)
_httpConnection.SendRequestAsync(null, dataToSend, message.RequestMethod, HttpDataSourceResponseType.AsString);
else
_httpConnection.SendRequest(null, dataToSend, message.RequestMethod, HttpDataSourceResponseType.AsString);
}
/// <summary>
/// Sends a bayeux message to the server.
/// Connection must be established first otherwise the exception will be thrown.
/// </summary>
public void Send(BayeuxRequest message, bool asynchronous)
{
if (_state != BayeuxConnectionState.Connected)
throw new InvalidOperationException("Not connected");
if (message == null)
throw new ArgumentNullException("message");
Send(message, null, asynchronous);
}
/// <summary>
/// Stops listening for asynchronous data.
/// </summary>
public void StopLongPolling()
{
if (IsLongPolling)
{
_longPollingRequest = null;
_longPolling = false;
_httpLongPollingConnection.Cancel();
}
}
/// <summary>
/// Starts another long-polling HTTP connection to asynchronously receive events from Bayeux server.
/// </summary>
public void StartLongPolling(BayeuxRequest request)
{
if (request == null)
throw new ArgumentNullException("request");
if (_httpLongPollingConnection == null)
throw new InvalidOperationException("Long-polling connection not specified during BayeuxConnection object creation");
if (State != BayeuxConnectionState.Connected)
throw new InvalidOperationException("Not connected");
if (IsLongPolling)
throw new InvalidOperationException("Connection is already polling");
_longPollingRequest = request;
_longPolling = true;
ReconnectLongPollingConnection(true);
}
private void DataSource_OnDataReceiveFailed(object sender, HttpDataSourceEventArgs e)
{
// say, there the current request is no more needed:
BayeuxRequest r = _request;
_request = null;
if (r != null)
r.ProcessFailed(e);
OnDataFailed(new BayeuxConnectionEventArgs(this, e.StatusCode, e.StatusDescription));
}
private void ProcessReceivedData(BayeuxRequest request, HttpDataSourceEventArgs e)
{
IJSonObject jsonData = null;
try
{
// read JSON data:
jsonData = _jsonReader.ReadAsJSonObject(e.StringData);
OnDataReceived(new BayeuxConnectionEventArgs(this, e.StatusCode, e.StatusDescription, e.StringData, jsonData, null));
}
catch (JSonReaderException ex)
{
OnDataFailed(new BayeuxConnectionEventArgs(this, e.StatusCode, e.StatusDescription, e.StringData, ex));
}
if (jsonData != null)
{
// process JSON response, in case it is an array of responses:
if (jsonData.IsArray)
{
foreach (IJSonObject message in jsonData.ArrayItems)
{
ProcessResponseMessage(request, e.StatusCode, e.StatusDescription, message, e.StringData);
}
}
else
{
ProcessResponseMessage(request, e.StatusCode, e.StatusDescription, jsonData, e.StringData);
}
}
else
{
DebugLog.WriteBayeuxLine("--- No JSON data received from server ---");
OnDataFailed(new BayeuxConnectionEventArgs(this, HttpStatusCode.NoContent, "No JSON data received"));
}
}
private void DataSource_OnDataReceived(object sender, HttpDataSourceEventArgs e)
{
// say, there the current request is no more needed:
BayeuxRequest r = _request;
_request = null;
ProcessReceivedData(r, e);
}