ruby-core

Issue #13431 has been updated by youchan (瑶 大崎).


That is different from my case.

I forgot telling you the important fact.

* I copied files `http0.rb`, `http0server.rb` to working directory.
* I rewrote `http0server.rb` line 3, `require 'drb/http0'` to `require_relative './http0'`

And ran my scripts.

The results are as described above.

There seems to be a deadlock between the queue in server protocol and drb main loop.

I confirmed the program is blocked in

sample/drb/http0server.rb:28

and

drb/drb.rb:1660

~~~
   1655:       return nil if !client0
   1656:       Thread.start(client0) do |client|
   1657:         @grp.add Thread.current
   1658:         Thread.current['DRb'] = { 'client' => client ,
   1659:                                   'server' => self }
=> 1660:         DRb.mutex.synchronize do
   1661:           client_uri = client.uri
   1662:           @exported_uri << client_uri unless @exported_uri.include?(client_uri)
   1663:         end
   1664:         loop do
~~~


----------------------------------------
Bug #13431: sample/drb/http0*.rb is not working.
https://bugs.ruby-lang.org/issues/13431#change-64405

* Author: youchan (瑶 大崎)
* Status: Open
* Priority: Normal
* Assignee: seki (Masatoshi Seki)
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
I tried to use drb over http with the sample code *sample/drb/http0*.rb*
I wrote the code as following.

*server.rb*
~~~
require 'drb/drb'
require_relative './http0serv'

class SampleObject
  def test
    "ACK!"
  end
end

DRb.start_service("http://127.0.0.1:1234", SampleObject.new)
DRb.thread.join
~~~

*client.rb*
~~~
require 'drb/drb'
require_relative './http0'

remote = DRbObject.new_with_uri "http://127.0.0.1:1234"

puts remote.test
~~~

This results in the following.

~~~
/Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/protocol.rb:176:in `rbuf_fill': Net::ReadTimeout (Net::ReadTimeout)
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/protocol.rb:154:in `readuntil'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/protocol.rb:164:in `readline'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http/response.rb:40:in `read_status_line'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http/response.rb:29:in `read_new'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http.rb:1446:in `block in transport_request'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http.rb:1443:in `catch'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http.rb:1443:in `transport_request'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http.rb:1416:in `request'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http.rb:1409:in `block in request'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http.rb:877:in `start'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http.rb:1407:in `request'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http.rb:1430:in `send_entity'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/net/http.rb:1218:in `post'
        from /Users/youchan/Projects/tmp/drb_over_http/http0.rb:67:in `post'
        from /Users/youchan/Projects/tmp/drb_over_http/http0.rb:54:in `send_request'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/drb/drb.rb:1253:in `send_message'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/drb/drb.rb:1142:in `block (2 levels) in method_missing'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/drb/drb.rb:1229:in `open'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/drb/drb.rb:1141:in `block in method_missing'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/drb/drb.rb:1160:in `with_friend'
        from /Users/youchan/.rbenv/versions/2.4.1/lib/ruby/2.4.0/drb/drb.rb:1140:in `method_missing'
        from client.rb:6:in `<main>'
~~~



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