Etiene Dalcol - Web development with Lua Programming Language - code.talks 2015

Web development with Lua Programming Language

Introducing Sailor, an MVC web framework in Lua

Etiene Dalcol @etiene_d

@etiene_dcode.talks 2015

@etiene_d


Sailor!sailorproject.org

http://sailorproject.org


Lua Ladieslualadies.org



Advantages

Powerful. Simple. Fast.



Better Reasons

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


Better Reasons


• 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

Better Reasons


-- Cipher module

--[[ Based on algorithms/caesar_cipher.lua

by Roland Yonaba ]]

local cipher = {}

local function ascii_base(s)

return s:lower() == s and ('a'):byte() or ('A'):byte()

end

function cipher.caesar( str, key )

return str:gsub('%a', function(s)

local base = ascii_base(s)

return string.char(((s:byte() - base + key) % 26) + base)

end)

end

return cipher

One slide crash course: cipher module


-- Cipher module


by Roland Yonaba ]]

local cipher = {}



end





end)

end

return cipher



-- Cipher module


by Roland Yonaba ]]

local cipher = {}



end





end)

end

return cipher



-- Cipher module


by Roland Yonaba ]]

local cipher = {}



end





end)

end

return cipher



-- Cipher module


by Roland Yonaba ]]

local cipher = {}



end





end)

end

return cipher



-- Cipher module


by Roland Yonaba ]]

local cipher = {}



end





end)

end

return cipher



-- Cipher module


by Roland Yonaba ]]

local cipher = {}



end





end)

end

return cipher



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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







Why?



Servers

• Apache: mod_lua

• Nginx: OpenResty


Servers

• Apache: mod_lua



Servers

• Apache: mod_lua


• Xavante

• Others: Lighttpd, Lwan, Pegasus, Mongoose


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 Needs a better documentation


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!


Sailor!

0.1 (Venus)


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),

Xavante, Mongoose, Lighttpd and Lwan • Compatible with Linux, Windows and Mac • Compatible with different databases • MIT License • Pre alpha v0.4 (Chibi) • 0.5 (Pluto) will be released soon!



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 • Automated tests


• 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 • Automated tests

• 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



$ luarocks install luasql-mysql

How to get Sailor!

$ luarocks install sailor $ sailor create ‘My App’ /var/www $ cd /var/www/my_app $ lua start-server.lua


/conf /controllers /models /pub /runtime /tests /themes /views

App structure


/conf /controllers /models /pub /runtime /tests /themes /views

App structure

Lua filesStuff!

JS libraries, images…Temp files Lua Pages


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.theme = nil page:write(“I’m different!”) end return site


<!-- /views/site/index.lp —> <p> A message from the server: <?lua page:print(msg) ?> <br/> The message again: <%= msg %> <!-- syntactic sugar: same thing as above —></p>

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) -- Sailor v0.4 -- window:alert(another_msg) -- ^ Sailor v0.5 ?>

Example!



local user = {} local v = require “valua” -- validation module user.attributes = { { id = “safe” }, { name = v:new().not_empty().len(6,50) } } user.db = { key = ‘id’, table = ‘users’ } user.relations = { posts = { -- u.posts relation = “HAS_MANY”, model = “post”, attribute = “author_id” } } return user

Example!


local user = {} local v = require “valua” -- validation module user.attributes = { { id = “safe” }, { name = v:new().not_empty().len(6,50) } } 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

Example!

sailorproject.org

github.com/Etiene/sailor

[email protected]

@etiene_d


http://github.com/Etiene/sailor

mailto:[email protected]

sailorproject.org


[email protected]

@etiene_d




sailorproject.org


[email protected]

@etiene_d




sailorproject.org


[email protected]

@etiene_d

Thank you!

Internet

Etiene Dalcol - Web development with Lua Programming Language - code.talks 2015