From: Daniel Berger <djberge@...>
Date: 2002-10-22T00:57:45+09:00
Subject: XMLRPC and complex data structures

Hi all,

Ruby 1.6.7, REXML 2.4.2, Sys/ProcTable 3.1, XML-RPC 1.7.11

I'm getting the dreaded "Internal Server Error" when I try to return an
array of structs within a handler.

Here's the code:

require "xmlrpc/server"
require "sys/proctable"
include Sys

class Test
   def add(a,b)
      a + b
   end

   def ps
      a = []
      a = ProcTable.ps # This fails
      #ProcTable.ps{|struct| a.push(struct.pid)} # This works
      return a
   end
end

server = XMLRPC::Server.new(8889,"1.2.3.4",4,$stdout) # Use a real IP
server.add_handler("test",Test.new)
server.serve

The ProcTable.ps call returns an array of structs in lvalue context, and
that seems to be the problem.  I also tried just returning a list of
pid's and that worked fine.  The "add" method also works fine (I just
threw that in for testing purposes).

Here's the actual client code:

require "xmlrpc/client"

client = XMLRPC::Client.new("1.2.3.4",nil,8889) # Use a real IP

begin
   v = client.call("test.ps")
rescue RuntimeError => e
   puts "Error:"
   puts e.faultCode
   puts e.faultString
rescue XMLRPC::FaultException => e
   puts "Error:"
   puts e.faultCode
   puts e.faultString
end

Here's the RuntimeError message:

>ruby xmlrpcClientTest.rb
Error:
xmlrpcClientTest.rb:9: undefined method `faultCode' for
#<RuntimeError:0x15bb30> (NameError)

Any ideas?

Regards,

Dan