/
LoggingEncoder.cs
177 lines (137 loc) · 5.3 KB
/
LoggingEncoder.cs
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// This is an open source non-commercial project. Dear PVS-Studio, please check it.
// PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
using System;
using System.IO;
using System.ServiceModel.Channels;
using System.Text;
using WcfSoapLogger.Exceptions;
using WcfSoapLogger.HandlerCustom;
namespace WcfSoapLogger.EncodingExtension
{
public class LoggingEncoder : MessageEncoder
{
private readonly MessageEncoder _innerEncoder;
private readonly SoapLoggerSettings _settings;
private readonly HandlerDefault _handler;
public override string ContentType {
get {
return _innerEncoder.ContentType;
}
}
public override string MediaType {
get {
return _innerEncoder.MediaType;
}
}
public override MessageVersion MessageVersion {
get {
return _innerEncoder.MessageVersion;
}
}
public override T GetProperty<T>()
{
return _innerEncoder.GetProperty<T>();
}
public override bool IsContentTypeSupported(string contentType)
{
return _innerEncoder.IsContentTypeSupported(contentType);
}
public LoggingEncoder(MessageEncoder innerEncoder, SoapLoggerSettings settings)
{
_innerEncoder = innerEncoder;
_settings = settings;
if (_settings.UseCustomHandler)
{
_handler = new HandlerCustom.HandlerCustom(_settings);
}
else
{
_handler = new HandlerDefault(_settings);
}
}
public override Message ReadMessage(ArraySegment<byte> buffer, BufferManager bufferManager, string contentType)
{
ArraySegment<byte> errorBuffer = HandleMessage(buffer, false);
if (errorBuffer.Array != null)
{
buffer = errorBuffer;
}
var message = _innerEncoder.ReadMessage(buffer, bufferManager, contentType);
return message;
}
public override ArraySegment<byte> WriteMessage(Message message, int maxMessageSize, BufferManager bufferManager, int messageOffset)
{
ArraySegment<byte> buffer = _innerEncoder.WriteMessage(message, maxMessageSize, bufferManager, messageOffset);
ArraySegment<byte> errorBuffer = HandleMessage(buffer, true);
if (errorBuffer.Array != null)
{
buffer = errorBuffer;
}
return buffer;
}
private ArraySegment<byte> HandleMessage(ArraySegment<byte> buffer, bool writeMessage)
{
//XOR, because request is writeMessage on client side and readMessage on service side
bool request = writeMessage ^ _settings.IsService;
try
{
byte[] body = new byte[buffer.Count];
Array.Copy(buffer.Array, buffer.Offset, body, 0, body.Length);
_handler.HandleBody(body, request);
return new ArraySegment<byte>();
}
catch (Exception ex)
{
if (_settings.IsClient)
{
// on client side exception would naturally emerge for both request and response
throw;
}
byte[] errorBody = GetServiceSideErrorBody(ex, request);
var errorBuffer = new ArraySegment<byte>(errorBody);
return errorBuffer;
}
}
private byte[] GetServiceSideErrorBody(Exception ex, bool request) {
if (request)
{
//this can happen only with default handler on service side
//typically when lacking access to file system
SoapLoggerService.SetRequestException(ex);
//in order to force HTTP 500 Internal Server Error and avoid processing
//we overwrite request with deliberately invalid body
return ErrorBody.InvalidRequest();
}
// response
string message = null;
if (ex is LoggerException)
{
message = ex.Message;
}
else
{
message = ex.ToString();
}
string soapFault = ErrorBody.CreateSoapFaultResponse(message);
byte[] errorBody = Encoding.UTF8.GetBytes(soapFault);
return errorBody;
}
// no logging for stream transfer mode
public override Message ReadMessage(Stream stream, int maxSizeOfHeaders, string contentType)
{
return _innerEncoder.ReadMessage(stream, maxSizeOfHeaders, contentType);
}
public override void WriteMessage(Message message, Stream stream)
{
_innerEncoder.WriteMessage(message, stream);
}
public override IAsyncResult BeginWriteMessage(Message message, Stream stream, AsyncCallback callback, object state)
{
return _innerEncoder.BeginWriteMessage(message, stream, callback, state);
}
public override void EndWriteMessage(IAsyncResult result)
{
_innerEncoder.EndWriteMessage(result);
}
}
}