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)

Sample Page in DSL

-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
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