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Bug #13431

closed

sample/drb/http0*.rb is not working.

Bug #13431: sample/drb/http0*.rb is not working.

Added by youchan (瑶 大崎) over 8 years ago. Updated about 6 years ago.

Status:
Closed
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
[ruby-core:80679]

Description

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>'

Updated by znz (Kazuhiro NISHIYAMA) over 8 years ago Actions
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 #1 [ruby-core:80767]

  • Assignee set to seki (Masatoshi Seki)

以下のようにサーバーを起動して別端末で ruby -e '$LOAD_PATH.push "sample"' -e 'require "drb/http0"' -e 'remote = DRbObject.new_with_uri "http://127.0.0.1:12346"; puts remote.test' のように呼び出すと、以下のように client.uri で NoMethodError になるので、 r32254 の変更で動かなくなったようです。

% ruby -vdI lib -e '$LOAD_PATH.push "sample"' -e 'require "drb/http0serv"' -e 'class SampleObject;def test;"ACK!";end;end;DRb.start_service("http://127.0.0.1:12346", SampleObject.new); DRb.thread.join' ruby 2.5.0dev (2017-04-18 trunk 58385) [x86_64-linux] Exception `LoadError' at .../ruby/lib/rubygems.rb:1345 - cannot load such file -- rubygems/defaults/operating_system Exception `LoadError' at .../ruby/lib/rubygems.rb:1354 - cannot load such file -- rubygems/defaults/ruby Exception `DRb::DRbBadScheme' at .../ruby/lib/drb/drb.rb:826 - http://127.0.0.1:12346 Exception `NoMethodError' at .../ruby/lib/drb/drb.rb:1661 - undefined method `uri' for #<DRb::HTTP0::ServerSide:0x0000000002593b28> Exception `NoMethodError' at -e:3 - undefined method `uri' for #<DRb::HTTP0::ServerSide:0x0000000002593b28> 127.0.0.1 - - [18/Apr/2017:21:31:19 JST] "POST / HTTP/1.1" 200 0 - -> / from .../ruby/lib/drb/drb.rb:1660:in `block in main_loop' from .../ruby/lib/drb/drb.rb:1660:in `synchronize' .../ruby/lib/drb/drb.rb:1661:in `block (2 levels) in main_loop': undefined method `uri' for #<DRb::HTTP0::ServerSide:0x0000000002593b28> (NoMethodError)

Updated by youchan (瑶 大崎) over 8 years ago Actions
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 #2 [ruby-core:80807]

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

Updated by shyouhei (Shyouhei Urabe) over 8 years ago Actions
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 #3

  • Status changed from Open to Assigned

Updated by jeremyevans (Jeremy Evans) about 6 years ago Actions
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 #4

  • Status changed from Assigned to Closed

Applied in changeset git|71d97a5ef80a23b0bb1005570ed059580981a467.

Fix sample/drb/http0serv.rb

Previously, trying to use this would result in:

undefined method `uri' for #DRb::HTTP0::ServerSide:0x00000aec9f1637f8 (NoMethodError)

Also, use a relative require to load sample/drb/http0.rb.

Fixes [Bug #13431]

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