Forum: Ruby on Rails Server settings for BackgrounDRB?

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73c04e9ef9ca435c5b19a2e765ae6d20?d=identicon&s=25 Max Williams (max-williams)
on 2008-10-14 15:47
I have backgroundrb working locally and everything's fine.  However, i
can't get it running on our server.

I read a blog post by David Burger about backgroundrb
(http://david-burger.blogspot.com/2008/04/backgroun...)
and it says that you set up your backgroundrb.yml file with a different
section for each environment you want to use.  Mine looks like this:

---
:backgroundrb:
  :ip: 0.0.0.0
  :port: 11007

:development:
  :backgroundrb:
    :port: 11006
    :environment: development
    :persistent_delay: 2

:staging:
  :backgroundrb:
    :port: 11007
    :environment: staging
    :persistent_delay: 10

:production:
  :backgroundrb:
    :port: 11008
    :environment: production
    :persistent_delay: 15

The environment i'm trying to get it working in initially is 'staging'
(our server-based environment for playing with new stuff before
deploying it to the live server).  I set a different persistent_delay in
each environment just so i could watch the log file and see what's going
on.  I start backgroundrb like this:

  sudo ./script/backgroundrb start -e staging

The server starts ok, and in my staging.log i can see it querying the
job queue table every five seconds (the default time).  So, it seems to
be running, but ignoring my 'staging' settings.  When i try and call it
from the console or my app, i get this error:

  BackgrounDRb::NoServerAvailable

Can anyone help?
thanks, max
87e41d0d468ad56a3b07d9a6482fd6d5?d=identicon&s=25 Hemant Kumar (gnufied)
on 2008-10-14 18:23
(Received via mailing list)
On Tue, Oct 14, 2008 at 7:17 PM, Max Williams
<rails-mailing-list@andreas-s.net> wrote:
> :backgroundrb:
>  :backgroundrb:
> The environment i'm trying to get it working in initially is 'staging'
> from the console or my app, i get this error:
>
>  BackgrounDRb::NoServerAvailable
>

This feature of recursively merging environments was removed from
version 1.0.4 and hence your code may not work.
Alternately, you can try applying following diff (if you have up to
date copy of bdrb from git):

diff --git a/lib/backgroundrb/bdrb_config.rb
b/lib/backgroundrb/bdrb_config.rb
index adde8b9..5c76346 100644
--- a/lib/backgroundrb/bdrb_config.rb
+++ b/lib/backgroundrb/bdrb_config.rb
@@ -33,6 +33,16 @@ module BackgrounDRb
         Object.const_set("RAILS_ENV",environment)
       end

+      if config[environment]
+        deep_proc = Proc.new do |key, oldval, newval|
+          if oldval.kind_of?(Hash) && newval.kind_of?(Hash)
+            next oldval.merge(newval,&deep_proc)
+          end
+          next newval
+        end
+        config.merge!( config[environment], &deep_proc)
+      end
+
       ENV["RAILS_ENV"] = environment
       config
     end
73c04e9ef9ca435c5b19a2e765ae6d20?d=identicon&s=25 Max Williams (max-williams)
on 2008-10-15 12:11
Thanks Kumar (or should i call you Hemant?)

I do have the latest version from git and i tried just manually patching
in your chunk of code.  But it didn't seem to make any difference.
73c04e9ef9ca435c5b19a2e765ae6d20?d=identicon&s=25 Max Williams (max-williams)
on 2008-11-14 13:09
Max Williams wrote:

Hi Hemant

I found the problem - the code you gave me doesn't work with the config,
because having a colon at the start of the variable names, like this

:development:
  :backgroundrb:
    :port: 11006
    :environment: development
    :persistent_delay: 2

This means that the keys in the config hash that is built up all start
with a colon and are interpreted as symbols rather than strings.   So, i
end up with a hash that looks like this:

config = {:development => {:backgroundrb => {:port => 11006, etc}}
         {:staging => {:backgroundrb => etc etc

BUT, the environment variable, set with -e, is a regular string.  So, if
i start backgroundrb with "-e staging", it tries to match "staging"
against :staging, doesn't find a match, and so goes with the defaults.
I fixed this in mine by converting the environment variable to a symbol
before comparing with the config hash: here's my altered version of the
code you gave me in the earlier post:

      if config[environment.to_sym]
        deep_proc = Proc.new do |key, oldval, newval|
          if oldval.kind_of?(Hash) && newval.kind_of?(Hash)
            next oldval.merge(newval,&deep_proc)
          end
          next newval
        end
        config.merge!( config[environment.to_sym], &deep_proc)
      end

Thanks
max
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