web development with lua and sailor @ geecon 2015

Web development with Lua Programming Language

Introducing Sailor, a web MVC framework in Lua

Etiene Dalcol @etiene_d

@etiene_d

Sailor!

http://sailorproject.org

Web development with Lua @ GeeCON 2015 @etiene_d


Lua Ladies

http://lualadies.org


http://lualadies.org

Google Summer of Code

LabLua


Advantages


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 made in my home country(In my university to be more precise)

• It’s easy to learn


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? ?

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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


Web development with Lua @etiene_d

Why?


Servers

• Apache: mod_lua

• Nginx: OpenResty


Servers


• Apache: mod_lua


Servers

• Apache: mod_lua


• Xavante

• Others


Frameworks

• Orbit (2007)Least knownNo significant updates since 2010MVC


Frameworks

• Orbit (2007)Least knownNo significant updates since 2010MVC

• Luvit (2011)Most popularIntense developmentnode.js port 2-4x faster


Frameworks• Lapis (2012)

Intense developmentMoonscript and LuaVery well documentedTemplaterOpenResty onlyNot MVC


Frameworks• Lapis (2012)

Intense developmentMoonscript and LuaVery well documentedTemplaterOpenResty onlyNot MVC

• OthersComplicated, 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


• 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

What (else) is cool about 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-mysqlOptional


/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

[email protected] @etiene_d


http://github.com/Etiene/sailor

mailto:[email protected]

Example!


sailorproject.org github.com/Etiene/sailor

[email protected] @etiene_d


http://github.com/Etiene/sailor

mailto:[email protected]

web development with lua and sailor @ geecon 2015

Software

lua etiene dalcol

mvc web development

openresty web development

lua nginx

servers web development

precise web development

faster web development

advantages web development