1. .
.
Raemon
@yinhm
June 7, 2010
. .
@yinhm Raemon 1/8

2. .
Daemon libs
.
• daemons
• servolux
• daemon kit
. .
@yinhm Raemon 2/8

3. .
Raemon
.
• base on unicorn
• master -> multi-work(preforked) model
. .
@yinhm Raemon 3/8

4. .
Unicorn
.
• it is UNIX
• fork
• IO::pipe, selfpipe
• socket
• tmpio
. .
@yinhm Raemon 4/8

5. .
example: consume queue
.
#!/ u s r / b i n / env ruby
r e q u i r e ' rubygems '
r e q u i r e ' raemon '
r e q u i r e ' b e a n s t a l k−c l i e n t '
ENV[ " RAILS_ENV " ] ||= " development "
r e q u i r e F i l e . dirname (__FILE__) + " / . . / . . / c o n f i g / environment "
A c t i o n C o n t r o l l e r : : Base . perform_caching = f a l s e
c l a s s FooJobWorker
TIMEOUT = 10
i n c l u d e Raemon : : Worker
def before_start
@ b e a n s t a l k = B e a n s t a l k : : Pool . new ( [ ' l o c a l h o s t : 1 1 3 0 0 ' ] , ' foo ' )
end
d e f before_shutdown
@beanstalk . c l o s e
end
def execute
...
end
end
Raemon : : Master . s t a r t u p ( 2 , FooJobWorker , {
: detach = true ,
>
: logger = Logger . new (RAILS_ROOT + '/ l o g / foo_queue . log ' ) ,
>
: p i d _ f i l e = RAILS_ROOT + '/tmp/ p i d s / foo_queue . pid ' ,
>
: timeout = 120 >
}). join
. .
@yinhm Raemon 5/8

6. .
example: execute
.
c l a s s FooJobWorker
...
def execute
begin
j o b = @ b e a n s t a l k . r e s e r v e (TIMEOUT)
i f job
l o g g e r . i n f o "(#{ P r o c e s s . pp id }:#{ P r o c e s s . p i d }) got j o b : #{j o b . i n s p e c t }"
A c t i v e R e c o r d : : Base . c o n n e c t i o n . uncached do
f o o = Foo . f i n d ( j o b . ybody )
i f foo . process
job . d e l e t e
else
j o b . r e l e a s e ( j o b . p r i , 60)
end
end
end
r e s c u e B e a n s t a l k : : TimedOut
rescue StandardError
l o g g e r . e r r o r " Got e x c e p t i o n : #{$ ! . i n s p e c t }"
i f job
job . d e l e t e
job = n i l
end
end
. end
@yinhm end Raemon . 6/8

7. .
References
.
• Raemon
• Unicorn
• I like Unicorn because it's Unix
. .
@yinhm Raemon 7/8

8. .
About
.
Created in A E using the beamer class, TeX Live and Emacs.
L X
T
Published under the Creative Commons Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/
by @yinhm
http://yinhm.appspot.com
Document version June 7, 2010
. .
@yinhm Raemon 8/8