From: Eric Hodel <drbrain@...7.net>
Date: 2003-02-05T02:39:03+09:00
Subject: Re: postgres/drb experts [or hi eric ;-)]


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ahoward (ahoward@fsl.noaa.gov) wrote:

>=20
> drb'ing ruby'ists-
>=20
> i am confused (in general, but especially on this topic) :
>=20
> i was under the impression that if one was to NOT include DRbUndumped in a
> class that client's using the class remotely would be required to load any
> client libraries.  if that is the case, then this would not work, and yet=
 it
> does?
>=20
> ~/eg/ruby/dpostgres > cat s.rb && s.rb
>=20
> #!/usr/bin/env ruby
> require 'postgres'
> require 'drb'
> DRb.start_service 'druby://localhost:5000', PGconn.new
> DRb.thread.join
>=20
>=20
> ~/eg/ruby/dpostgres > cat c.rb && c.rb
>=20
> #!/usr/bin/env ruby
> require 'drb'
> DRb.start_service
> pgconn =3D DRbObject.new nil, 'druby://localhost:5000'
> pgresult =3D pgconn.exec (ARGV.shift or 'select * from foo')
> p pgresult.result
> pgresult.clear
>=20
> [["2003-02-04 10:23:34.522356-07", "2003-02-05 00:00:00-07"]]
>=20
>=20
> note that the client does __NOT__ do "require 'postgres'" ???

Mayhap this is happening:

def dump(obj, ary)
  obj =3D DRbObject.new(obj) if obj.kind_of? DRbUndumped
  begin
    str =3D Marshal::dump(obj)
  rescue
    ro =3D DRbObject.new(obj)
    str =3D Marshal::dump(ro)
  end
  ary.push([str.size].pack('N') + str) if ary
  return str
end

try this:
ruby -r postgres -e "Marshal::dump(PGConn.new)"

If you get an exception, then DRb DTRT (Did The Right Thing) and wrapped
the un-dumpable object in a proxy for you. :)

Note that DRb does the right thing with this:

require 'drb'

DRb.start_service('druby://localhost:5000', File.new('server.rb'))
DRb.thread.join

--=20
Eric Hodel - drbrain@segment7.net - http://segment7.net
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