web development with lua programming...
TRANSCRIPT
Web development with Lua Programming Language
Introducing Sailor, a web MVC framework in Lua
Etiene Dalcol@etiene_d
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
Why?
Servers
• Apache: mod_lua
• Nginx: OpenResty
Servers
• Apache: mod_lua
• Nginx: OpenResty
Servers
• Apache: mod_lua
• Nginx: OpenResty
• 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!
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-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!<!-- /views/site/index.lp -->
<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
Example!
