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zappa.coffee
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zappa.coffee
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# **Zappa** is a [CoffeeScript](http://coffeescript.org) DSL-ish interface for building web apps on the
# [node.js](http://nodejs.org) runtime, integrating [express](http://expressjs.com), [socket.io](http://socket.io)
# and other best-of-breed libraries.
zappa = version: '0.3.3'
codename = 'The Gumbo Variations'
log = console.log
fs = require 'fs'
path = require 'path'
uuid = require 'node-uuid'
express = require 'express'
socketio = require 'socket.io'
uglify = require 'uglify-js'
minify = (js) ->
ast = uglify.parser.parse(js)
ast = uglify.uglify.ast_mangle(ast)
ast = uglify.uglify.ast_squeeze(ast)
uglify.uglify.gen_code(ast)
# Shallow copy attributes from `sources` (array of objects) to `recipient`.
# Does NOT overwrite attributes already present in `recipient`.
copy_data_to = (recipient, sources) ->
for obj in sources
for k, v of obj
recipient[k] = v unless recipient[k]
# Keep inline views at the module level and namespaced by app id
# so that the monkeypatched express can look them up.
views = {}
viewhelpers = {}
# Monkeypatch express to support lookup of inline templates. Such is life.
express.View.prototype.__defineGetter__ 'exists', ->
# Path given by zappa: /path/to/appid/foo.bar.
# Try appid/foo.bar in memory.
p = @path.replace @root + '/', ''
id = p.split('/')[0]
return true if views[p]
# Try appid/foo in memory.
p = p.replace(path.extname(p), '')
return true if views[p]
# Try /path/to/foo.bar in filesystem (normal express behaviour).
p = @path.replace id + '/', ''
try
fs.statSync(p)
return true
catch err
return false
express.View.prototype.__defineGetter__ 'contents', ->
# Path given by zappa: /path/to/appid/foo.bar.
# Try appid/foo.bar in memory.
p = @path.replace @root + '/', ''
id = p.split('/')[0]
return views[p] if views[p]
# Try appid/foo in memory.
p = p.replace(path.extname(p), '')
return views[p] if views[p]
# Try /path/to/foo.bar in filesystem (normal express behaviour).
p = @path.replace id + '/', ''
fs.readFileSync p, 'utf8'
# Takes in a function and builds express/socket.io apps based on the rules contained in it.
zappa.app = (func) ->
context = {id: uuid(), zappa, express}
context.root = path.dirname(module.parent.filename)
# Storage for user-provided stuff.
# Views are kept at the module level.
ws_handlers = {}
helpers = {}
postrenders = {}
app = context.app = express.createServer()
io = context.io = socketio.listen(app)
# Tracks if the zappa middleware is already mounted (`@use 'zappa'`).
zappa_used = no
# Zappa's default settings.
app.set 'view engine', 'html'
replace_partials = (src, pf) ->
return src.replace /@partial \w+/g, (match, pos, contents, s)->
fn = match['@partial'.length+1..]
pf(fn)
app.register '.html',
compile: (str, options)->
return (locals)->
str = str.replace(/@body/g, options.body) if options.body
if options.initdata and not options.isPartial and not options.isLayout
str = str.replace /_initdata/g, JSON.stringify(options.initdata)
replace_partials(str, options.partial)
# Sets default view dir to @root (`path.dirname(module.parent.filename)`).
app.set 'views', path.join(context.root, '/views')
for verb in ['get', 'post', 'put', 'del']
do (verb) ->
context[verb] = ->
if arguments.length > 1
route verb: verb, path: arguments[0], handler: arguments[1]
else
for k, v of arguments[0]
route verb: verb, path: k, handler: v
context.js = (obj) ->
for k, v of obj
js = String(v)
js = minify(js) if app.settings['minify']
route verb: 'get', path: k, handler: js, contentType: 'js'
context.css = (obj) ->
for k, v of obj
css = String(v)
route verb: 'get', path: k, handler: css, contentType: 'css'
context.helper = (obj) ->
for k, v of obj
helpers[k] = v
context.on = (obj) ->
for k, v of obj
ws_handlers[k] = v
context.view = (obj) ->
for k, v of obj
views["#{context.id}/#{k}"] = v
context.register = (obj) ->
for k, v of obj
app.register '.' + k, v
context.set = (obj) ->
for k, v of obj
app.set k, v
context.enable = ->
app.enable i for i in arguments
context.disable = ->
app.disable i for i in arguments
context.use = ->
zappa_middleware =
static: (p = path.join(context.root, '/public')) ->
express.static(p)
zappa: ->
(req, res, next) ->
send = (code) ->
res.contentType 'js'
res.send code
next()
use = (name, arg = null) ->
zappa_used = yes if name is 'zappa'
if zappa_middleware[name]
app.use zappa_middleware[name](arg)
else if typeof express[name] is 'function'
app.use express[name](arg)
for a in arguments
switch typeof a
when 'function' then app.use a
when 'string' then use a
when 'object' then use k, v for k, v of a
context.configure = (p) ->
if typeof p is 'function' then app.configure p
else app.configure k, v for k, v of p
context.settings = app.settings
context.include = (p) ->
sub = require path.join(context.root, p)
sub.include.apply(context, [context])
# Register a route with express.
route = (r) ->
qry = app.lookup[r.verb]( r.path)
if qry.length > 0
console.log "#{r.verb} #{r.path} exists! Replace it"
app.remove[r.verb] r.path
if typeof r.handler is 'string'
app[r.verb] r.path, (req, res) ->
res.contentType r.contentType if r.contentType?
res.send r.handler
else
app[r.verb] r.path, (req, res, next) ->
ctx =
app: app
settings: app.settings
request: req
query: req.query
params: req.params
body: req.body
session: req.session
response: res
next: next
send: -> res.send.apply res, arguments
redirect: -> res.redirect.apply res, arguments
render: ->
if typeof arguments[0] isnt 'object'
render.apply @, arguments
else
for k, v of arguments[0]
render.apply @, [k, v]
render = (args...) ->
# Adds the app id to the view name so that the monkeypatched
# express.View.exists and express.View.contents can lookup
# this app's inline templates.
args[0] = context.id + '/' + args[0]
# Make sure the second arg is an object.
args[1] ?= {}
args.splice 1, 0, {} if typeof args[1] is 'function'
if app.settings['databag']
args[1].params = data
# Just forward params to express.
res.render.apply res, args
for name, helper of helpers
do (name, helper) ->
ctx[name] = (args...) ->
args.push ctx
helper.apply ctx, args
if app.settings['databag']
data = {}
copy_data_to data, [req.query, req.params, req.body]
# Go!
switch app.settings['databag']
when 'this' then result = r.handler.apply(data, [ctx])
when 'param' then result = r.handler.apply(ctx, [data])
else result = r.handler.apply(ctx, [ctx])
res.contentType(r.contentType) if r.contentType?
if typeof result is 'string' then res.send result
else return result
# Register socket.io handlers.
io.sockets.on 'connection', (socket) ->
c = {}
build_ctx = ->
ctx =
app: app
io: io
settings: app.settings
socket: socket
id: socket.id
emit: ->
if typeof arguments[0] isnt 'object'
socket.emit.apply socket, arguments
else
for k, v of arguments[0]
socket.emit.apply socket, [k, v]
broadcast: ->
if typeof arguments[0] isnt 'object'
socket.broadcast.emit.apply socket.broadcast, arguments
else
for k, v of arguments[0]
socket.broadcast.emit.apply socket.broadcast, [k, v]
for name, helper of helpers
do (name, helper) ->
ctx[name] = ->
helper.apply(ctx, arguments)
ctx
ctx = build_ctx()
ws_handlers.connection.apply(ctx, [ctx]) if ws_handlers.connection?
socket.on 'disconnect', ->
ctx = build_ctx()
ws_handlers.disconnect.apply(ctx, [ctx]) if ws_handlers.disconnect?
for name, h of ws_handlers
do (name, h) ->
if name isnt 'connection' and name isnt 'disconnect'
socket.on name, (data) ->
ctx = build_ctx()
ctx.data = data
switch app.settings['databag']
when 'this' then h.apply(data, [ctx])
when 'param' then h.apply(ctx, [data])
else h.apply(ctx, [ctx])
# Go!
func.apply(context, [context])
context
# Takes a function and runs it as a zappa app. Optionally accepts a port number, and/or
# a hostname (any order). The hostname must be a string, and the port number must be
# castable as a number.
# Returns an object where `app` is the express server and `io` is the socket.io handle.
# Ex.:
# require('zappa') -> get '/': 'hi'
# require('zappa').run 80, -> get '/': 'hi'
# require('zappa') -> 'domain.com', 80, -> get '/': 'hi'
zappa.run = ->
host = null
port = 3000
root_function = null
for a in arguments
switch typeof a
when 'string'
if isNaN( (Number) a ) then host = a
else port = (Number) a
when 'number' then port = a
when 'function' then root_function = a
zapp = zappa.app(root_function)
app = zapp.app
if host then app.listen port, host
else app.listen port
log 'Express server listening on port %d in %s mode',
app.address()?.port, app.settings.env
log "SZappa #{zappa.version} \"#{codename}\" orchestrating the show"
zapp
module.exports = zappa.run
module.exports.run = zappa.run
module.exports.app = zappa.app
module.exports.adapter = zappa.adapter
module.exports.version = zappa.version