Web development with Lua Programming Language

Web development with Lua Programming Language Introducing Sailor, a web MVC framework in Lua Etiene Dalcol @etiene_d

@etiene_d

Sailor! http://sailorproject.org

Lua Ladies http://lualadies.org

Google Summer of Code LabLua

Advantages

better reasons It looks cool (I heard you could make games with it)

better reasons It looks cool (I heard you could make games with it) It s made in my home country (In my university to be more precise)

better reasons It looks cool (I heard you could make games with it) It s made in my home country (In my university to be more precise) It s easy to learn

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Lua on the web Early stage cgilua ~ 1995 Kepler Project ~ 2003

I have myself developed Web sites with pure C++, Java, C#, PHP, and Python. The easiest way to go was definitely Python. If the libraries existed, Lua would be not quite as easy to use as Python, but probably quite a bit more efficient; I think it would become my first choice... if the libraries existed. Michael Gogins Recently there was some discussion about mod_lua on the Apache developers mailing list. I mentioned there that I feel Lua could replace PHP as the number one web scripting language if mod_lua were stable (i.e. not still in beta) and it were implemented well (not making some of PHP's mistakes such as putting everything in the global scope with no consistent naming or parameter schemes). I've wanted to use Lua for all the things I currently use PHP for ever since I discovered it. Rena

Servers Apache: mod_lua Nginx: OpenResty

Servers Apache: mod_lua Nginx: OpenResty Xavante Others

Frameworks Orbit (2007) Least known No significant updates since 2010 MVC

Frameworks Orbit (2007) Least known No significant updates since 2010 MVC Luvit (2011) Most popular Intense development node.js port 2-4x faster

Frameworks Lapis (2012) Intense development Moonscript and Lua Very well documented Templater OpenResty only Not MVC

Frameworks Lapis (2012) Intense development Moonscript and Lua Very well documented Templater OpenResty only Not MVC Others Complicated, abandoned, poorly documented, license issues or I never heard about it...

Sailor!

Sailor! 0.1 (Venus) 0.2 (Mars)

What exactly is Sailor? It s an MVC web framework Completely written in Lua Compatible with Apache (mod_lua), Nginx (OpenResty), Mongoose, Xavante and Lwan Compatible with Linux, Windows and Mac Compatible with different databases MIT License Pre alpha v0.2 (Mars) 0.3 (Jupiter) will be released TODAY!

What (else) is cool about Sailor? Routing and friendly URLs Session, cookies, include, redirect Lua Pages parsing Mail sending Simple Object Relational-Mapping Validation (valua) Basic login and authentication modules Form generation Themes (Bootstrap integration out of the box) App generator (Linux and Mac only) Model and CRUD generator

What (else) is cool about Routing and friendly URLs Session, cookies, include, redirect Lua Pages parsing Mail sending Simple Object Relational-Mapping Validation (valua) Basic login and authentication modules Form generation Themes (Bootstrap integration out of the box) App generator (Linux and Mac only) Model and CRUD generator Lua at client Sailor?

Not so great things It s still in early development Things are changing fast It lacks features Documentation

How to get Sailor! $ luarocks install sailor $ sailor_create My App /var/www $ cd /var/www/my_app $ lua start-server.lua

How to get Sailor! $ luarocks install sailor $ sailor_create My App /var/www $ cd /var/www/my_app $ lua start-server.lua $ luarocks install luasql-mysql

/conf /controllers /models /pub /runtime /themes /views App structure

Example! -- /controllers/site.lua local site = {} function site.index(page) local msg = Hello World page:render( index, { msg = msg } ) end function site.notindex(page) page:write( I m different! ) end return site

Example!  <p> A message from the server: <?lua page:print(msg)?> <br/> The message again: <%= msg %> <!-- same thing as above > </p>

Example!

Example! <?lua@server -- Code here runs on the server?> <?lua -- Same as above?> <?lua@client -- Runs at the client?> <?lua@both -- Runs at the server and the client?> <?lua@both another_msg = Another message?> <?lua page:print(another_msg)?> <?lua@client js.window.alert(another_msg)?>

Example!

Example! local user = {} local v = require valua -- validation module user.attributes = { } { id = safe }, { name = v:new().not_empty() } user.db = { key = id, table = users } user.relations = { } posts = { -- u.posts } relation = HAS_MANY, model = post, attribute = author_id return user

Example! -- /controllers/site.lua local site = {} function site.index(page) local User = sailor.model( user ) local u = User:new() u.name = Arnold local msg if u:save() then msg = Success else msg = table.unpack(u.errors) end local users = User:find_all() page:render( index, { msg = msg, users = users } ) end return site

sailorproject.org github.com/etiene/sailor dalcol@etiene.net @etiene_d

Example!

sailorproject.org github.com/etiene/sailor dalcol@etiene.net @etiene_d