Web development with Lua: Introducing Sailor an MVC web framework @ CodingSerbia 2015
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Lua is a very fast and powerful scripting language that can be easily embeddable. It has been shining in industries like game development, for example. Lua is also an excellent tool as a general purpose language and can be used to develop robust applications. Its use in web developments, however, despite its great potential and incredible benchmarks, needs to be more widespread. This talk will mention the current state of Lua in web development, show some benchmarks, compare existing tools and teach how to get started with Sailor, an MVC web framework written in Lua.
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Web development with Lua: Introducing Sailor an MVC web framework @ CodingSerbia 2015
- 1. Web development with Lua Programming Language Introducing Sailor, an MVC web framework in Lua Etiene Dalcol @etiene_d
- 4. @etiene_dCoding Serbia 2015 Lua Ladies lualadies.org
- 5. @etiene_dCoding Serbia 2015 Google Summer of Code LabLua
- 6. @etiene_dCoding Serbia 2015 Lua overview The state of web dev Sailor
- 13. @etiene_dCoding Serbia 2015 http://www.humbedooh.com/presentations/ACNA%20-%20mod_lua.odp Introducing mod_lua by Daniel Gruno
- 14. @etiene_dCoding Serbia 2015 Better Reasons • It looks cool (I heard you could make games with it)
- 15. @etiene_dCoding Serbia 2015 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)
- 16. @etiene_dCoding Serbia 2015 • 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 Better Reasons
- 17. @etiene_dCoding Serbia 2015 -- 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
- 18. @etiene_dCoding Serbia 2015 -- 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
- 19. @etiene_dCoding Serbia 2015 -- 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
- 20. @etiene_dCoding Serbia 2015 -- 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
- 21. @etiene_dCoding Serbia 2015 -- 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
- 22. @etiene_dCoding Serbia 2015 -- 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
- 23. @etiene_dCoding Serbia 2015 -- 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
- 24. @etiene_dCoding Serbia 2015 ? ? Learning Lua ? ? ?
- 25. @etiene_dCoding Serbia 2015 Lua on the web • Early stage • cgilua ~ 1995 • Kepler Project ~ 2003
- 26. @etiene_dCoding Serbia 2015 “ 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
- 28. @etiene_dCoding Serbia 2015 9423 words http://eev.ee/blog/2012/04/09/php-a-fractal-of-bad-design/
- 29. @etiene_dCoding Serbia 2015 9423 words http://eev.ee/blog/2012/04/09/php-a-fractal-of-bad-design/
- 37. @etiene_dCoding Serbia 2015 Why isn’t Lua more popular?
- 38. @etiene_dCoding Serbia 2015 Servers • Apache: mod_lua • Nginx: OpenResty
- 39. @etiene_dCoding Serbia 2015 Servers • Apache: mod_lua • Nginx: OpenResty
- 40. @etiene_dCoding Serbia 2015 Servers • Apache: mod_lua • Nginx: OpenResty • Xavante • Others: Lighttpd, Lwan, Pegasus, Mongoose
- 41. @etiene_dCoding Serbia 2015 Frameworks Orbit (2007) Least known No significant updates since 2010 MVC
- 42. @etiene_dCoding Serbia 2015 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
- 43. @etiene_dCoding Serbia 2015 Frameworks Lapis (2012) Intense development Moonscript and Lua Very well documented Templater OpenResty only Not MVC
- 44. @etiene_dCoding Serbia 2015 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...
- 49. @etiene_dCoding Serbia 2015 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!
- 51. @etiene_dCoding Serbia 2015 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
- 52. @etiene_dCoding Serbia 2015 • 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?
- 53. @etiene_dCoding Serbia 2015 Not so great things • It’s still in early development • Things are changing fast • It lacks features • Documentation
- 54. @etiene_dCoding Serbia 2015 How to get Sailor! $ luarocks install sailor $ sailor create ‘My App’ /var/www $ cd /var/www/my_app $ lua start-server.lua
- 56. @etiene_dCoding Serbia 2015 $ 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
- 57. @etiene_dCoding Serbia 2015 /conf /controllers /models /pub /runtime /tests /themes /views App structure
- 58. @etiene_dCoding Serbia 2015 /conf /controllers /models /pub /runtime /tests /themes /views App structure Lua files Stuff! JS libraries, images… Temp files Lua Pages
- 59. @etiene_dCoding Serbia 2015 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
- 60. @etiene_dCoding Serbia 2015 <!-- /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!
- 62. @etiene_dCoding Serbia 2015 <?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!
- 64. @etiene_dCoding Serbia 2015 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!
- 65. @etiene_dCoding Serbia 2015 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!
- 66. @etiene_dCoding Serbia 2015 -- /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!