comp.lang.ruby

Anders Engström

2/23/2005 10:03:00 PM

On Thu, Feb 24, 2005 at 06:44:12AM +0900, Dido Sevilla wrote:
> Is there a way to let a method called via druby over TCP/IP learn the
> IP address of the remote peer invoking it? If not, is there a way to
> allow a local node to obtain its own IP address? I'm writing a program
> that involves having clients connect to a server and register
> addresses where they can be contacted via druby whenever asynchronous
> events later occur. They will then get called by the server when the
> asynchronous event occurs. DRb.uri gives useless results for this
> application because DRb seems to always use the machine's actual
> hostname in the URI, which usually doesn't resolve because many of
> the clients have dynamic IP's and don't have valid hostnames as such,
> especially the Windows boxes which run the client.
>

I had the same question a couple of months ago - and thanks to
#ruby-lang@FreeNode and some code-browsing I found out that the
following should work (in most cases):

(in a distributed object instance)
def client_address()
if client = Thread.current['DRb']['client']
return client.peeraddr if client.respond_to?(:peeraddr)
end
end

DRb binds some useful stuff to the executing thread - but this is very
un-documented :/ I'm not sure how reliable this is from one version to
the next.

//Anders

--
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Anders Engström aengstrom@gnejs.net
http://www... PGP-Key: ED010E7F
[Your mind is like an umbrella. It doesn't work unless you open it.]