protected abstract void RequestSent(HttpRequestState request);
protected abstract void RequestReply(HttpRequestState state, bool success, WebException exception);
protected void ReadCallback(IAsyncResult result)
{
try
{
_RequestState = (HttpRequestState)result.AsyncState;
Stream responseStream = _RequestState.ResponseStream;
int read = responseStream.EndRead(result);
// Check if we have read the entire response
if (read > 0)
{
// Create the byte array if it hasn't been created yet
if (_RequestState.ResponseData == null || _RequestState.ResponseData.Length != _RequestState.WebResponse.ContentLength)
_RequestState.ResponseData = new byte[_RequestState.WebResponse.ContentLength];
// Copy the current buffer data in to the response variable
Buffer.BlockCopy(_RequestState.BufferRead, 0, _RequestState.ResponseData, _RequestState.ResponseDataPos, read);
// Increment our writing position in the response variable
_RequestState.ResponseDataPos += read;
// Continue reading the response until EndRead() returns 0
IAsyncResult asynchronousResult = responseStream.BeginRead(_RequestState.BufferRead, 0, BUFFER_SIZE,
new AsyncCallback(ReadCallback), _RequestState);
return;
}
else
{
// Fire the callback for receiving a response
try { RequestReply(_RequestState, true, null); }
catch (Exception e) { SecondLife.LogStatic(e.ToString(), Helpers.LogLevel.Error); }
responseStream.Close();
}
}
catch (WebException e)
{
Stop(false, e);
}
}
private void ResponseCallback(IAsyncResult result)
{
try
{
_RequestState = (HttpRequestState)result.AsyncState;
_RequestState.WebResponse = (HttpWebResponse)_RequestState.WebRequest.EndGetResponse(result);
// Read the response into a Stream object
Stream responseStream = _RequestState.WebResponse.GetResponseStream();
_RequestState.ResponseStream = responseStream;
// Begin reading of the contents of the response
IAsyncResult asynchronousInputRead = responseStream.BeginRead(_RequestState.BufferRead, 0, BUFFER_SIZE,
new AsyncCallback(ReadCallback), _RequestState);
// If there is a timeout, the callback fires and the request becomes aborted
ThreadPool.RegisterWaitForSingleObject(asynchronousInputRead.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback),
_RequestState, HTTP_TIMEOUT, true);
}
catch (WebException e)
{
Stop(false, e);
}
}
protected void RequestStreamCallback(IAsyncResult result)
{
try
{
_RequestState = (HttpRequestState)result.AsyncState;
Stream reqStream = _RequestState.WebRequest.EndGetRequestStream(result);
reqStream.Write(_RequestState.RequestData, 0, _RequestState.RequestData.Length);
reqStream.Close();
IAsyncResult newResult = _RequestState.WebRequest.BeginGetResponse(new AsyncCallback(ResponseCallback), _RequestState);
// If there is a timeout, the callback fires and the request becomes aborted
ThreadPool.RegisterWaitForSingleObject(newResult.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback),
_RequestState, HTTP_TIMEOUT, true);
}
catch (WebException e)
{
Stop(false, e);
}
}
public void Start()
{
if (_Listener != null)
{
// Server mode
_Listener.Start();
_Listener.BeginGetContext(_ServerCallback, _Listener);
}
else if (!String.IsNullOrEmpty(_RequestURL))
{
// Client mode
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(_RequestURL);
IAsyncResult result;
// Always disable keep-alive for our purposes
httpRequest.KeepAlive = false;
// Create a state object to track this request in async callbacks
_RequestState = new HttpRequestState(httpRequest);
_RequestState.State = _State;
if (!String.IsNullOrEmpty(_ProxyURL))
{
// Create a proxy object
WebProxy proxy = new WebProxy();
// Associate a new Uri object to the _wProxy object, using the proxy address
// selected by the user
proxy.Address = new Uri(_ProxyURL);
// Finally, initialize the Web request object proxy property with the _wProxy
// object
httpRequest.Proxy = proxy;
}
try
{
if (_PostData != null)
{
// POST request
_RequestState.WebRequest.Method = "POST";
_RequestState.WebRequest.ContentLength = _PostData.Length;
if (!String.IsNullOrEmpty(_ContentType))
_RequestState.WebRequest.ContentType = _ContentType;
_RequestState.RequestData = _PostData;
result = (IAsyncResult)_RequestState.WebRequest.BeginGetRequestStream(
new AsyncCallback(RequestStreamCallback), _RequestState);
}
else
{
// GET request
result = (IAsyncResult)_RequestState.WebRequest.BeginGetResponse(
new AsyncCallback(ResponseCallback), _RequestState);
}
// If there is a timeout, the callback fires and the request becomes aborted
ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback),
_RequestState, HTTP_TIMEOUT, true);
}
catch (WebException e)
{
Stop(false, e);
return;
}
// If we get here the request has been initialized, so fire the callback for a request being started
RequestSent(_RequestState);
}
else
{
SecondLife.LogStatic("HttpBase.Start() called with no client or server mode initialized",
Helpers.LogLevel.Error);
}
}
