Bug #13431
closedsample/drb/http0*.rb is not working.
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 7 years ago
- 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 7 years ago
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'
torequire_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 7 years ago
- Status changed from Open to Assigned
Updated by jeremyevans (Jeremy Evans) about 5 years ago
- 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]