N2O: Erlang Web Framework

Features

Formatters: BERT, JSON, Binary or Custom
Protocols: Nitrogen, RoR, N2O
Endpoints: WebSocket, HTTP, REST
PubSub: MQS, GPROC
Templates: DTL
Sessions: STD and Autogenerated Logins
DOM Language: Nitrogen DSL, Erlang Shen
Speed: 15K req/s
Security: AES CBC 128
Samples: Skyline (DSL), Games (SPA)

All Features in One snippet

-module(index).
-compile(export_all).
-include_lib("n2o/include/wf.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() ->
    {ok,Pid} = wf:comet(fun() -> chat_loop() 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() ->
    receive {Peer, Message} ->
       wf:insert_bottom(history,#panel{body=[Peer,": ",Message,#br{}]}),
       wf:flush(room) end, chat_loop().

And try to compare how this functionality would be implemented with your favourite language/framework.

Performance

We are using for measurement ab, httperf, wrk and siege, all of them. The most valuable storm created by wrk and it is not achieved in real apps but could show us the internal throughput of individual components. The most near to real life apps is siege who also make DNS lookup for each request. So this data shows internal data throughput by wrk:

Framework	Enabled Components	Speed	Timeouts
PHP5 FCGI	Simple script with two terms inside	5K	timeouts
ChicagoBoss	No sessions, No DSL, Simple template with two variable	500	no
Nitrogen	No sessions, No DSL, Simple template with two variable	1K	no
N2O	All enabled, sessions, Template, heavy DSL	7K	no
N2O	Sessions enabled, template with two variables, no DSL	10K	no
N2O	No sessions, No DSL, only template with two vars	15K	no

Kickstart Bootstrap

To try N2O you just need to clone a N2O repo from Github and build. We use very small and powerful mad tool designed for our Web Stack.

$ git clone git://github.com/5HT/n2o
$ cd n2o/samples
$ ./mad deps compile plan repl

Now you can try: http://localhost:8000

LINUX NOTE: if you want to have online recompilation you should do at first:

$ sudo apt-get install inotify-tools

Support

IRC Channel #n2o on FreeNode 24/7
Official N2O Book HTML and PDF

Credits

Maxim Sokhatsky -- core, shen, windows
Dmitry Bushmelev -- endpoints, yaws, cowboy
Andrii Zadorozhnii -- elements, actions, handlers
Vladimir Kirillov -- mac, bsd, xen, linux support
Andrey Martemyanov -- binary protocols
Oleksandr Nikitin -- security
Anton Logvinenko -- doc
Roman Shestakov -- advanced elements, ct
Jesse Gumm -- nitrogen, help
Rusty Klophaus -- original author

OM A HUM

G-Grand/n2o