From: Nathaniel Talbott <nathaniel@...>
Date: 2003-08-08T09:36:48+09:00
Subject: DRb & OpenSSL... more info

Found some more interesting info...

When I include the following file (based on why's patch) in the s.rb and
c.rb scripts I sent in [ruby-talk:78251]:

File: patch.rb

  require 'openssl/buffering'

  module Buffering
    BLOCK_SIZE = 4096

    private

    def fill_rbuff
      @rbuffer = "" unless defined? @rbuffer
      begin
        if self.respond_to?(:to_io)
          IO.select([self.to_io], nil, nil, 1.5)
        end
        @rbuffer << self.sysread(BLOCK_SIZE)
      rescue EOFError
        @eof = true
      end
    end
  end

I get the following output:

c.rb (this now works, although there's an obvious pause waiting for the
timeout):

  ntalbott@proxytest:~$ ruby c.rb drbssl://localhost:5777
  ./patch.rb:4: warning: already initialized constant BLOCK_SIZE
  Connected to drbssl://localhost:5777
  3
  500000

s.rb:

  ntalbott@proxytest:~$ ruby s.rb drbssl://localhost:5777
  ./patch.rb:4: warning: already initialized constant BLOCK_SIZE
  ............................++++++++++++
  ....++++++++++++
  Listening on drbssl://localhost:5777
  Called #small
  Called #large
  #<DRb::DRbConnError: connection closed>
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:104:in `load'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:131:in `recv_request'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:283:in `recv_request'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:663:in `init_with_client'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:675:in `setup_message'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:648:in `perform'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:715:in `main_loop'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:711:in `loop'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:729:in `main_loop'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:707:in `start'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:707:in `main_loop'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:599:in `run'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:596:in `start'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:596:in `run'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:549:in `initialize'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:737:in `new'
  /usr/lib/ruby/site_ruby/1.8/drb/drb.rb:737:in `start_service'
  s.rb:23
  (The server keeps running, and will accept more requests from the client)

My guess? That the server finishes servicing the request, but the client
doesn't think it's done yet. The client then sends a bit more data (as part
of the SSL session that they're running over) to check if there's anything
else. The server, thinking it's done, interprets this as another request.
This has the result that both client and server hang, the server waiting for
the rest of the new request, and the client waiting for the server to say
the original request is done. Maybe. Does that make any sense?

Thanks,


Nathaniel

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