Integrating Erlang with PHP

Integrating
Erlang with PHP
Alvaro Videla

June 2010 - IPC Spring Edition - Berlin

Wednesday, June 2, 2010

About Me

• Lead Developer at TheNetCircle.com
• Twitter: @old_sound
• Blog: http://obvioushints.blogspot.com/
• PHP Erlang Bridge Core Developer


What’s Erlang?


What’s Erlang?
• General Purpose Functional Language


What’s Erlang?
• Multi Platform


What’s Erlang?
• Multi Platform
• Invented in 1986 at Ericsson


What’s Erlang?
• Multi Platform
• Invented in 1986 at Ericsson
• Open Sourced in 1998


Products written in Erlang



• Amazon SimpleDB



• Amazon SimpleDB
• Ejabberd - XMPP server



• Amazon SimpleDB
• RabbitMQ - AMQP Messaging Server



• Amazon SimpleDB
• Riak - Decentralized Key/Value Store



• Amazon SimpleDB
• CouchDB - Document Oriented Database



• Amazon SimpleDB
• CouchDB - Document Oriented Database
• Mochiweb - Lightweight HTTP Servers


What’s in the package?


• Fault Tolerance


• Fault Tolerance
• Distribution


• Fault Tolerance
• Distribution
• Concurrency


• Fault Tolerance
• Distribution
• Concurrency
• Code Hot Swap


• Fault Tolerance
• Distribution
• Concurrency
• Code Hot Swap
• Mnesia a DDBMS


• Fault Tolerance
• Distribution
• Concurrency
• Code Hot Swap
• Mnesia a DDBMS
• OTP Framework


The Language
• Single Assignment


The Language
• Controlled Side Effects


The Language
• Pattern Matching


The Language
• Pattern Matching
• Closures


PHP Integration

• PHP Erlang Bridge
• C Extension
• Converts PHP into a “cnode”


What can I build?


What can I build?
• Web Admins for Erlang Systems


What can I build?
• PHP Session Storage Systems


What can I build?
• Ad hoc K/V stores


What can I build?
• Run Map/Reduce Jobs in Erlang


What can I build?
• Run Map/Reduce Jobs in Erlang
• Much more…


RabbitMQ Admin Console


Session Storage

• Why?
• To ease session data distribution
• Be able to add logic to sessions
• Several storage backends to choose from


Session Storage: Bitcask

• Developed by Basho as a Riak backend
• Minimalistic API
• Stores data on disk
• Easy to Backup and Restore

* http://blog.basho.com/2010/04/27/hello,-bitcask/


http://github.com/videlalvaro/phpcask

Ad Hoc K/V Store

• Using Erlang Term Storage (ETS)
• In memory tables
• Adapt the API to suit your needs


Do I have to learn Erlang?



• NO



• NO
• Well,Yes, a little will help.



http://learnyousomeerlang.com/

Installing the extension

• grab the code*
• phpize
• ./conﬁgure
• make
• make install
* http://code.google.com/p/mypeb/

Hello Erlang


Connecting to erlang

• peb_connect($host, $cookie);


Sending messages

• peb_send_by_name($node, $msg, $link);
• peb_send_by_pid($node, $msg, $link);


Encoding messages

• peb_vencode($format, $data);
• peb_encode($format, $data);


Encoding Examples


Formatting Characters
• [] List

• {} Tuple

• ~a Atom

• ~s String

• ~b Binary

• ~i Integer

• ~d Double

• ~p Pid


Receiving Messages

• peb_receive($link);


Decoding Messages

• peb_vdecode($msg);
• peb_decode($msg);


Decoding Messages

• String, Atom, Binary -> String
• Tuple, List -> Array
• Pid -> Resource
• Integer -> Integer
• Float -> Double


RPC Calls

• peb_rpc($node, $module, $function, $msg);

• peb_rpc_to($node, $module, $function, $msg);


Resources

• PHP Erlang Bridge: http://code.google.com/p/mypeb/

• Erlang Website: http://www.erlang.org/

• Online Book: http://learnyousomeerlang.com/

• Community Site http://trapexit.org/

• Conferences: http://www.erlang-factory.com/


Questions?


Thanks!
Alvaro Videla
http://twitter.com/old_sound
TheNetCircle.com


Integrating Erlang with PHP

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