[PATCH] close_connection_after_writing only if not deferred, as in cool.io

Eric Wong normalperson at yhbt.net
Tue Dec 18 23:59:54 UTC 2012

"Lin Jen-Shin (godfat)" <godfat at godfat.org> wrote:
> On Wed, Dec 19, 2012 at 5:45 AM, Eric Wong <normalperson at yhbt.net> wrote:
> > Heh, I gave that a shot way back in the day but never got it working
> > to my satisfaction.  Perhaps your fix is what is needed...
> Glad to know that. Hope this time we could reach your satisfaction :P
> I have some hard time running the test suites though :(
> I can't even pass all tests without any of my patches with:
>     make EventMachine
> This works better, but still cannot pass everything:
>     make -j8 EventMachine
> My linux crashed at the moment, and I am too lazy to fix it right now,
> thus running tests on my mac. I'll try to make sure that both EventMachine
> and EventMachineThreadSpawn fail on the same tests before sending
> the patch. Hope this would be good enough.

I've had no trouble running tests with various Linux distros.
It's been a long time since I've tested on FreeBSD, and I've
not tested on any other *BSD.  I cannot support non-Free OSes.

Anything in the *err logs?  The tests should leave them around on

> I'll continue to work on EventMachineThreadPool and EventMachineFiberSpawn
> only if EventMachineThreadSpawn works.
> >> would need this to properly pass the tests.
> >>
> >> I think this would be needed while using
> >> `throw :async' as well?
> >
> > I don't think so, you just need to set @deferred=nil in a few places
> > before calling quit.
> I am not sure if we read it the same way, but what I mean is that
> if the application is using `throw :async', we still need the check in
> this patch to avoid dropping connections while receiving SIGQUIT.
> Thus even if EventMachineThreadSpawn is not included, we still
> need that check for regular EventMachine to quit gracefully for
> applications use `throw :async'
> But anyway, I still don't really understand all the details in Rainbows,
> so of course it's very likely that I am simply wrong :P

The catch :async will set @deferred=true (obfuscated :x)
I'll commit this to clarify the code:

--- a/lib/rainbows/event_machine/client.rb
+++ b/lib/rainbows/event_machine/client.rb
@@ -38,14 +38,17 @@ class Rainbows::EventMachine::Client < EM::Connection
     @env[ASYNC_CALLBACK] = method(:write_async_response)
     @env[ASYNC_CLOSE] = EM::DefaultDeferrable.new
     status, headers, body = catch(:async) {
-    (nil == status || -1 == status) ? @deferred = true :
+    if (nil == status || -1 == status)
+      @deferred = true
+    else
       ev_write_response(status, headers, body, @hp.next?)
+    end
   def deferred_errback(orig_body)
     @deferred.errback do
       orig_body.close if orig_body.respond_to?(:close)
       @deferred = nil

> > I've updated the patch and commit message.  Will apply unless
> > you have objections:
> Thank you for the corrections and more explanation in the commit log.
> I am all for improving it, so credits don't really matter :) You could also
> change all the codes and logs in the patch, like fixing my broken English
> as well :P

Your actual fix was more important than my cleanups :)

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