1. Taming The Rabbit
Writing RabbitMQ Plugins
Alvaro Videla - VMware
Wednesday, October 24, 12

2. About Me
• Developer Advocate for Cloud Foundry
• Blog: http://videlalvaro.github.com/
• Twitter: @old_sound
Wednesday, October 24, 12

3. About Me
• Developer Advocate for Cloud Foundry
• Blog: http://videlalvaro.github.com/
• Twitter: @old_sound
• I created gifsockets™
Wednesday, October 24, 12

4. About Me
Co-authored
RabbitMQ in Action
http://bit.ly/rabbitmq
Wednesday, October 24, 12

5. RabbitMQ
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6. RabbitMQ
• Enterprise Messaging System
• Open Source MPL
• Written in Erlang/OTP
• Messaging via AMQP
• Acquired by Spring Source (VMware)
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7. Features
• Reliable and High Scalable
• Easy To install
• Easy To Cluster
• Runs on: Windows, Solaris, Linux, OSX
• AMQP 0.8 - 0.9.1
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8. Wednesday, October 24, 12

9. Extensible
• Plugin System
• Official Plugins
• Community Plugins
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10. Extensible
• Plugin System
• Official Plugins
• Community Plugins
• Plugins must be written in Erlang
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11. Wednesday, October 24, 12

12. What can you do with
plugins?
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13. Add new
Protocols
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14. STOMP
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15. STOMP
COMMAND
header1:value1
header2:value2
Body^@
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16. STOMP
CONNECT
accept-version:1.1
host:stomp.github.org
^@
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17. STOMP
CONNECTED
version:1.1
^@
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18. Websockets
+
STOMP
=
WebSTOMP
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19. Add Authentication
Mechanisms
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20. LDAP
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21. SSL
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22. Add your own Message
Store
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23. Must Read
http://www.rabbitmq.com/blog/2011/01/20/rabbitmq-
backing-stores-databases-and-disks/
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24. Wrap Erlang apps
together with
RabbitMQ
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25. cowboy-wrapper
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26. ldap-wrapper
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27. webmachine-wrapper
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28. Add extra functionality
to the broker
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29. RabbitMQ
Management Plugin
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30. http://www.rabbitmq.com/img/management/overview.png
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31. RabbitMQ
Shovel Plugin
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32. Create your Own
Exchanges
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33. Why?
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34. Exchanges
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35. Message Flow
http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.0/html/Messaging_Tutorial/chap-Messaging_Tutorial-Initial_Concepts.html
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36. AMQP Model
• Exchanges
• Message Queues
• Bindings
• Rules for binding them
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37. Exchange Types
• Fanout
• Direct
• Topic
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38. http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.0/html/Messaging_Tutorial/sect-Messaging_Tutorial-Initial_Concepts-
Fanout_Exchange.html
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39. http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.0/html/Messaging_Tutorial/sect-Messaging_Tutorial-Initial_Concepts-
Direct_Exchange.html
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40. http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.0/html/Messaging_Tutorial/sect-Messaging_Tutorial-Initial_Concepts-
Topic_Exchange.html
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41. random-exchange
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42. consistent-hash-exchange
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43. riak-exchange
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44. rabbitmq-global-fanout-exchange
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45. recent-history-exchange
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46. recent-history-exchange
user_x
Using the recent history exchange New
Msg
Last N messages
Msg
New Chat Room
Msg Exchange
Cache
Cached New New New
Msgs Msg Msg Msg
user_a user_b user_c
new_user
http://manning.com/videla/
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47. Exchange Behaviours
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48. recent-history-exchange
Caches up to
20 messages
Recent History
Exchange
route/2
Delivers
add_binding/3 cached msgs
to new client
delete/3
Drops
cached
messages
http://manning.com/videla/
Wednesday, October 24, 12

49. Env Setup
hg clone http://hg.rabbitmq.com/rabbitmq-public-umbrella
cd rabbitmq-public-umbrella
make co
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50. File Structure
|-- rabbitmq-public-umbrella
| |-- myplugin-folder
| | | -- package.mk
| | | -- Makefile
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51. RabbitMQ Boot Steps
https://github.com/videlalvaro/rabbit-internals/blob/master/rabbit_boot_process.md
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52. RabbitMQ Boot Steps
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53. RabbitMQ Boot Steps
-rabbit_boot_step({recovery,
[{description,
"exchange, queue and binding
recovery"},
{mfa, {rabbit, recover, []}},
{requires, empty_db_check},
{enables, routing_ready}]}).
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54. RabbitMQ Boot Steps
-rabbit_boot_step({msg_store_bitcask_index,
[{description,
"Bitcask Index for rabbit_msg_store"},
{mfa, {application, set_env,
[rabbit, msg_store_index_module, ?MODULE]}},
{enables, recovery}]}).
Modify Configuration at Startup
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55. Demo Code
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56. Managing Plugins
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57. rabbitmq-plugins
$ rabbitmq-plugins list
$ rabbitmq-plugins enable plugin_name
$ rabbitmq-plugins disable plugin_name
http://www.rabbitmq.com/man/rabbitmq-plugins.1.man.html
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58. ACHTUNG!
• Plugins Run in the same Erlang process
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59. ACHTUNG!
• Plugins Run in the same Erlang process
• They may crash your broker
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60. Have Fun
and
Experiment!
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61. Questions?
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62. Thanks!
Álvaro Videla
http://twitter.com/old_sound
http://github.com/videlalvaro
http://www.slideshare.net/old_sound
Wednesday, October 24, 12