Created

Embed URL

HTTPS clone URL

SSH clone URL

You can clone with HTTPS or SSH.

Download Gist

Demo and workaround for post-connection delay bug in EventMachine 1.0.0

View bug.rb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
#!/usr/bin/env ruby
#
# Demo and workaround for post-connection delay bug in EventMachine 1.0.0
#
# See https://github.com/eventmachine/eventmachine/issues/374 for explanation.
 
require 'rubygems'
require 'eventmachine' # 1.0.0
require 'amqp' # 0.8.0 / 54f18d426
 
# Configure AMQP, and capture async notification of connection status in
# configuration to survive reconnects.
 
::AMQP.settings.merge!({
:host => "localhost", :port => 5672, :user => "guest", :pass => "guest", :vhost => "/",
:connection_status => proc do |status|
@channel = ::AMQP::Channel.new(::AMQP.connection) if status == :connected
end
})
 
#EventMachine.epoll = true # exhibits same problem as select
#EventMachine.kqueue = true # doesn't suffer
 
##
## Initiate AMQP connection and wait for it to complete before proceeding.
##
 
@mutex = Mutex.new
@cv = ConditionVariable.new
 
Thread.new do
::AMQP.start do |c|
# Fix is to uncomment the following. Not sure if this survives
# reconnects:
#c.pending_connect_timeout = 0.1
@cv.signal
end
end
 
@mutex.synchronize { @cv.wait(@mutex) }
 
##
## Watch wireline packets to observe problem (e.g. ngrep -Td lo0 port 5672).
## The first will go out, the second will delay.
##
 
loop do
@channel.queue("some_queue", :durable => true).publish("some msg")
STDIN.readline
end
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Something went wrong with that request. Please try again.