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


http://twitter.com/old_sound


http://obvioushints.blogspot.com

http://obvioushints.blogspot.com

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://code.google.com/p/mypeb/



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/Wednesday, June 2, 2010

http://learnyousomeerlang.com


Installing the extension

• grab the code*

• phpize

• ./configure

• make

• make install

* http://code.google.com/p/mypeb/




Hello Erlang


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/


http://www.erlang.org

http://www.erlang.org



http://trapexit.org

http://trapexit.org

http://www.erlang-factory.com

http://www.erlang-factory.com

Questions?


Thanks!Alvaro Videla


TheNetCircle.com






Integrating Erlang with PHP

Documents

whats erlang

erlang peb

erlang term storage

storage backends

session data distribution

bitcask http

rabbitmq admin console

web admins