Given this MarshalByRef class:
public class MyRemotedClass : MarshalByRef
{
public void DoThis()
{
...
}
public void DoThat()
{
...
}
}
Client side code:
MyRemotedClass m = GetSomehowMyRemotedClass();
m.DoThis();
m.DoThat();
I can have several clients doing the same thing at a the same time. I would like to distinct the clients. How can I identify inside the remotely accessed methods, by whom the remoting invocation is executed? For example, I could log who did what. (Actually, I do not need to trace back the true client info, I just want to be able to group invocations by clients.)
[Edited to add more background info]
I have enormous amount of code to cover, including properties. Therefore extending the input parameter list is not an option.
One of the things you can do is identify a client by IP address by implementing an IServerChannelSinkProvider
.
Add this class to your remoting host project:
ClientIPServerSinkProvider.cs
using System;
using System.Collections;
using System.IO;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Messaging;
using System.Runtime.Remoting.Channels;
using System.Threading;
using System.Net;
namespace MyRemotingEnvironment
{
public class ClientIPServerSinkProvider :
IServerChannelSinkProvider
{
private IServerChannelSinkProvider _nextProvider = null;
public ClientIPServerSinkProvider()
{
}
public ClientIPServerSinkProvider(
IDictionary properties,
ICollection providerData)
{
}
public IServerChannelSinkProvider Next
{
get { return _nextProvider; }
set { _nextProvider = value; }
}
public IServerChannelSink CreateSink(IChannelReceiver channel)
{
IServerChannelSink nextSink = null;
if (_nextProvider != null)
{
nextSink = _nextProvider.CreateSink(channel);
}
return new ClientIPServerSink(nextSink);
}
public void GetChannelData(IChannelDataStore channelData)
{
}
}
public class ClientIPServerSink :
BaseChannelObjectWithProperties,
IServerChannelSink,
IChannelSinkBase
{
private IServerChannelSink _nextSink;
public ClientIPServerSink(IServerChannelSink next)
{
_nextSink = next;
}
public IServerChannelSink NextChannelSink
{
get { return _nextSink; }
set { _nextSink = value; }
}
public void AsyncProcessResponse(
IServerResponseChannelSinkStack sinkStack,
Object state,
IMessage message,
ITransportHeaders headers,
Stream stream)
{
IPAddress ip = headers[CommonTransportKeys.IPAddress] as IPAddress;
CallContext.SetData("ClientIPAddress", ip);
sinkStack.AsyncProcessResponse(message, headers, stream);
}
public Stream GetResponseStream(
IServerResponseChannelSinkStack sinkStack,
Object state,
IMessage message,
ITransportHeaders headers)
{
return null;
}
public ServerProcessing ProcessMessage(
IServerChannelSinkStack sinkStack,
IMessage requestMsg,
ITransportHeaders requestHeaders,
Stream requestStream,
out IMessage responseMsg,
out ITransportHeaders responseHeaders,
out Stream responseStream)
{
if (_nextSink != null)
{
IPAddress ip =
requestHeaders[CommonTransportKeys.IPAddress] as IPAddress;
CallContext.SetData("ClientIPAddress", ip);
ServerProcessing spres = _nextSink.ProcessMessage(
sinkStack,
requestMsg,
requestHeaders,
requestStream,
out responseMsg,
out responseHeaders,
out responseStream);
return spres;
}
else
{
responseMsg = null;
responseHeaders = null;
responseStream = null;
return new ServerProcessing();
}
}
}
}
Then when you start your remoting host do something like the following:
BinaryServerFormatterSinkProvider bp = new BinaryServerFormatterSinkProvider();
ClientIPServerSinkProvider csp = new ClientIPServerSinkProvider();
csp.Next = bp;
Hashtable ht = new Hashtable();
ht.Add("port", "1234"); // Your remoting port number
TcpChannel channel = new TcpChannel(ht, null, csp);
ChannelServices.RegisterChannel(channel, false);
RemotingConfiguration.RegisterWellKnownServiceType(
typeof(MyRemotedClass),
"MyRemotedClass.rem",
WellKnownObjectMode.SingleCall);
In your method calls you can access the IP address of the client by doing:
public class MyRemotedClass : MarshalByref
{
public void DoThis()
{
string clientIP = CallContext.GetData("ClientIPAddress").ToString();
}
}