Hi all,
I just ran into this situation: There's a module which uses DL to provide calls into a dynamic library. Now, I'd like to make these functions of the dyn. lib. available via DRb. (If I remember correctly, I somewhere read that "include ModuleThatUsesDL" is not a good idea to do, if that module uses DL in turn.)
With the code below, I get this error message:
···
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(druby://localhost:42000) c:/ruby/lib/ruby/1.8/drb/drb.rb:1419:in `check_insecure_method': undefined method `a_method' called for #<TheProxy:0x2911e98> (NameError)
from (druby://localhost:42000) c:/ruby/lib/ruby/1.8/drb/drb.rb:1461:in `check_insecure_method'
from (druby://localhost:42000) c:/ruby/lib/ruby/1.8/drb/drb.rb:1466:in `setup_message'
from (druby://localhost:42000) c:/ruby/lib/ruby/1.8/drb/drb.rb:1435:in `perform'
from (druby://localhost:42000) c:/ruby/lib/ruby/1.8/drb/drb.rb:1512:in `main_loop'
from (druby://localhost:42000) c:/ruby/lib/ruby/1.8/drb/drb.rb:1508:in `loop'
from (druby://localhost:42000) c:/ruby/lib/ruby/1.8/drb/drb.rb:1508:in `main_loop'
from (druby://localhost:42000) c:/ruby/lib/ruby/1.8/drb/drb.rb:1504:in `start'
from (druby://localhost:42000) c:/ruby/lib/ruby/1.8/drb/drb.rb:1504:in `main_loop'
... 6 levels...
from (druby://localhost:42000) F:/tmp/the_proxy.rb:24
from F:/tmp/the_client.rb:10
from F:/tmp/the_client.rb:9:in `times'
from F:/tmp/the_client.rb:9
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So the question is: How can I get this to work?
I would be grateful for information about this.
And here's the boiled down code:
# The Module (uses DL in real life)
# Filename: 'the_module.rb'
module TheModule
def a_method
"result"
end
end
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# The Proxy (provide access to the Module methods)
# Filename: 'the_proxy.rb'
require 'drb'
require 'English'
require 'the_module'
class TheProxy
# I seem to recall that doing this is bad in case
# the module uses DL (but where did I read that?)
# include TheModule
def method_missing( meth_name, *arguments )
call_it = "#{ meth_name.to_s }( #{arguments.join( ', ' )} )"
if TheModule.respond_to? meth_name
TheModule.instance_eval( call_it )
else
raise NoMethodError, "Can't handle method '#{ call_it }'", caller
end
end
end
if $PROGRAM_NAME == __FILE__
proxy = TheProxy.new
DRb.start_service( "druby://localhost:42000", proxy )
DRb.thread.join
end
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# The client which uses the Module via the Proxy
# Filename: 'the_client.rb'
require 'drb'
$stdout.sync = true
DRb.start_service
proxy = DRbObject.new( nil, "druby://localhost:42000" )
5.times do
puts proxy.a_method
sleep 0.5
end
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Happy rubying
Stephan