N4U (N2O FOR YOU): Erlang Application Server
==============================

Dependencies
---
```
```
do not forget  
```
sudo apt-get install esl-erlang
# or install erlang with kerl

sudo apt-get install git
sudo apt-get install gcc
sudo apt-get install make
sudo apt-get install build-essential
sudo apt-get install inotify-tools
```

Features
--------

* Formatters: **BERT**, JSON — changeable on the fly
* Protocols: [N2O](http://5ht.co/n2o.htm), [NITRO](http://5ht.co/n2o.htm), [SPA](http://5ht.co/n2o.htm), [FTP](http://5ht.co/ftp.htm)
* Endpoints: **WebSocket**, HTTP, [REST](http://synrc.github.io/rest)
* High Performance Protocol Relay
* Smallest possible codebase — **1K** **LOC**
* BEAM/LING support on posix, arm, mips and xen platforms
* Single-file atomic packaging with [MAD](http://synrc.github.io/mad)
* Handlers
  * PubSub: MQS, GPROC, SYN
  * Templates: DTL, [NITRO](http://synrc.github.io/nitro)
  * Sessions: server driven
  * DOM Language: SHEN JavaScript Compiler
  * Error Logging: IO, LOGGER
  * Security: PLAIN, AES CBC 128
* Speed: **30K** **conn/s** at notebook easily
* Samples: Skyline (DSL), Games (SPA), Review (KVS), Sample (MAD)

Message Formatters
------------------

You can use any message formmatter at the bottom of N2O protocol.
IO messages supported by the N2O protocol are as follows:

```
1. BERT : {io,"console.log('hello')",1}
2. WAMP : [io,"console.log('hello')",1]
3. JSON : {name:io,eval:"console.log('hello')",data:1}
4. TEXT : IO console.log('hello') 1\n
5. XML  : <io><eval>console.log('hello')</eval><data>1</data></io>
```

Besides, you can even switch a channel termination formatter on the fly
within one WebSocket session.

All Features in One snippet
---------------------------

```erlang
-module(index).
-compile([export_all, nowarn_export_all]).
-include_lib("nitro/include/nitro.hrl").
-include_lib("n4u/include/n4u.hrl").

peer()    -> io_lib:format("~p",[wf:peer(?REQ)]).
message() -> wf:js_escape(wf:html_encode(wf:q(message))).
main()    -> #dtl{file="index",app=n2o_sample,bindings=[{body,body()}]}.
body() ->
    {Pid,_} = wf:async(fun(X) -> chat_loop(X) end),
    [ #panel{id=history}, #textbox{id=message},
      #button{id=send,body="Chat",postback={chat,Pid},source=[message]} ].

event(init) -> wf:reg(room);
event({chat,Pid}) -> Pid ! {peer(), message()};
event(Event) -> skip.

chat_loop({Peer, Message} ) ->
       wf:insert_bottom(history,#panel{body=[Peer,": ",Message,#br{}]}),
       wf:flush(room) end.
```

Documentation
-------
* Official N2O v4.4 Book (outdated) [PDF](http://synrc.com/apps/n2o/doc/book.pdf)

---
OM A HUM