About Unicorn Rack handler

Eric Wong normalperson at yhbt.net
Wed Nov 4 12:07:15 EST 2009

"Lin Jen-Shin (aka godfat 真常)" <godfat at godfat.org> wrote:
> Hi,
> A couple days ago, I was trying to run Unicorn for Ramaze,
> and found that `Unicorn.run' didn't share the same interface
> with other Rack handlers, i.e. `options[:Host]' and `options[:Port]'
> Because of this, I can't just use:
>   Rack::Handler.register('unicorn', 'Unicorn')
> And invoke this:
>   Ramaze.start(:adapter => 'unicorn', :port => 8080)
> To address this, I added a simple wrapper in
> Innate (which is the core of Ramaze):
> http://github.com/godfat/innate/commit/9d607f41fdeeca366a9a07155e685ae2605c7025
> In short, simply hack the config to:
>   {:listeners => ["#{config[:Host]}:#{config[:Port]}"]}
> Should we adapt to this interface in Unicorn::Configurator,
> or provide an additional Rack handle to adapt to this,
> or maintain this Rack handler in Rack repository, just like the others?
> http://github.com/rack/rack/tree/master/lib/rack/handler

I think making Unicorn.run add to :listeners if :Host or :Port are set
will work.  I'm not sure if launching Unicorn directly from `rackup' can
ever work right without being too intrusive to the other servers, so
having a Unicorn Rack handler in distributed with Rack would't make
sense.   Unicorn needs to capture ARGV (before option parsing) and parse
its own config file, neither of which is doable out-of-the-box with

Does something like this work? (not tested).

diff --git a/lib/unicorn.rb b/lib/unicorn.rb
index 0f2b597..d4a00e0 100644
--- a/lib/unicorn.rb
+++ b/lib/unicorn.rb
@@ -17,6 +17,14 @@ module Unicorn
   class << self
     def run(app, options = {})
+      # compatibility with other interfaces (Ramaze)
+      host = options.delete(:Host)
+      port = options.delete(:Port)
+      if host || port
+        port ||= Const::DEFAULT_PORT
+        host ||= Const::DEFAULT_HOST
+        (options[:listeners] ||= []) << "#{host}:#{port}"
+      end
       HttpServer.new(app, options).start.join

On the other hand, does Innate make it possible to do transparent
upgrades (since rackup does not)?  I'll look into it a bit more later...

Eric Wong

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