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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.IO;
using System.Net;
using System.Reflection;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
using log4net;
namespace OpenSim.Framework.Servers.HttpServer
{
public class AsynchronousRestObjectRequester
{
private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
/// <summary>
/// Perform an asynchronous REST request.
/// </summary>
/// <param name="verb">GET or POST</param>
/// <param name="requestUrl"></param>
/// <param name="obj"></param>
/// <param name="action"></param>
/// <returns></returns>
///
/// <exception cref="System.Net.WebException">Thrown if we encounter a
/// network issue while posting the request. You'll want to make
/// sure you deal with this as they're not uncommon</exception>
//
public static void MakeRequest<TRequest, TResponse>(string verb,
string requestUrl, TRequest obj, Action<TResponse> action)
{
// m_log.DebugFormat("[ASYNC REQUEST]: Starting {0} {1}", verb, requestUrl);
Type type = typeof (TRequest);
WebRequest request = WebRequest.Create(requestUrl);
WebResponse response = null;
TResponse deserial = default(TResponse);
XmlSerializer deserializer = new XmlSerializer(typeof (TResponse));
request.Method = verb;
if (verb == "POST")
{
request.ContentType = "text/xml";
MemoryStream buffer = new MemoryStream();
XmlWriterSettings settings = new XmlWriterSettings();
settings.Encoding = Encoding.UTF8;
using (XmlWriter writer = XmlWriter.Create(buffer, settings))
{
XmlSerializer serializer = new XmlSerializer(type);
serializer.Serialize(writer, obj);
writer.Flush();
}
int length = (int) buffer.Length;
request.ContentLength = length;
request.BeginGetRequestStream(delegate(IAsyncResult res)
{
Stream requestStream = request.EndGetRequestStream(res);
requestStream.Write(buffer.ToArray(), 0, length);
requestStream.Close();
request.BeginGetResponse(delegate(IAsyncResult ar)
{
response = request.EndGetResponse(ar);
Stream respStream = null;
try
{
respStream = response.GetResponseStream();
deserial = (TResponse)deserializer.Deserialize(
respStream);
}
catch (System.InvalidOperationException)
{
}
finally
{
respStream.Close();
response.Close();
}
action(deserial);
}, null);
}, null);
return;
}
request.BeginGetResponse(delegate(IAsyncResult res2)
{
try
{
// If the server returns a 404, this appears to trigger a System.Net.WebException even though that isn't
// documented in MSDN
response = request.EndGetResponse(res2);
Stream respStream = null;
try
{
respStream = response.GetResponseStream();
deserial = (TResponse)deserializer.Deserialize(respStream);
}
catch (System.InvalidOperationException)
{
}
finally
{
respStream.Close();
response.Close();
}
}
catch (WebException e)
{
if (e.Status == WebExceptionStatus.ProtocolError)
{
if (e.Response is HttpWebResponse)
{
HttpWebResponse httpResponse = (HttpWebResponse)e.Response;
if (httpResponse.StatusCode != HttpStatusCode.NotFound)
{
// We don't appear to be handling any other status codes, so log these feailures to that
// people don't spend unnecessary hours hunting phantom bugs.
m_log.DebugFormat(
"[ASYNC REQUEST]: Request {0} {1} failed with unexpected status code {2}",
verb, requestUrl, httpResponse.StatusCode);
}
}
}
else
{
m_log.ErrorFormat("[ASYNC REQUEST]: Request {0} {1} failed with exception {2}", verb, requestUrl, e);
}
}
catch (Exception e)
{
m_log.ErrorFormat("[ASYNC REQUEST]: Request {0} {1} failed with exception {2}", verb, requestUrl, e);
}
// m_log.DebugFormat("[ASYNC REQUEST]: Received {0}", deserial.ToString());
try
{
action(deserial);
}
catch (Exception e)
{
m_log.ErrorFormat(
"[ASYNC REQUEST]: Request {0} {1} callback failed with exception {2}", verb, requestUrl, e);
}
}, null);
}
}
}
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