Cowboy rabbit-websockets

•

1 gostou•4,941 visualizações

Wade Mealing

Tecnologia

What
Cowboy ?
https://github.com/extend/cowboy
Small, fast modular web server written in
erlang.

What
Gen Bunny
https://github.com/mochi/gen_bunny
RabbitMQ client library for simple
pubsub in erlang.

What
Websocket ?
https://www.websocket.org/
Bi-directional web communication
mechanism.

Over Architecturing
You want it.
I deliver !

Server
Moving parts
Cowboy
Gen Bunny
Browser

Client
Moving parts
Cowboy
Gen Bunny
Browser

Client
Moving parts
BrowserBrowser
Server
HTTP
Port 80Port 80

Client
Moving parts
BrowserBrowser
Server
WS
UpgradeUpgradePort 80Port 80

JS Connection
wsUrl = "ws://server:8081/websocket";
websocket = new WebSocket(wsUrl);

Websocket Setup
websocket = new WebSocket(wsURL);
websocket.onopen = ...
websocket.onmessage =
function(evt){ onMessage(e) };
websocket.onerror = ...

onMessage Handler
function onMessage(e) {
Msg = '<p>' + txt + '</p>'
$('#output').prepend(Msg);
};

Cowboy
Routes, REST, middleware,
web sockets and more.

Cowboy WS
Required Callbacks
init
websocket_init
websocket_handle
websocket_info
websocket_terminate

Cowboy WS
init
Upgrades from
http → web socket

$Cowboy WS init({tcp, http}, _Req, _Opts) → {upgrade,protocol,cowboy_websocket}.$

Cowboy WS
websocket_init
Run on each
connection.

$Cowboy WS websocket_init(_Name, Req, _Opts) → Pid = consumer:start_link(), {ok, Req, #state{pid=Pid}}.$

Cowboy WS
websocket_handle
Recv data from client,
optionally return data.

$Cowboy WS websocket_handle(Data, Req, State) → {text, Msg} = Data, {reply, {text, << "recv: ", Msg/binary >>}, Req, State};$

Cowboy WS
websocket_info
Live Push data to
client

$Cowboy WS websocket_info(Data, Req, State) → {reply, {text, Data}, Req,State};$

Sending to RabbitMQ
RabbitMQ
websocket_handle

Recv from RabbitMQ
RabbitMQ
websocket_info
gen_bunny
CONSUMER

callbacks
Required:
● handle_message
● init
● handle_call
● handle_cast
● handle_info
● terminate

callbacks
handle_message
Handle messages from the message
subscribed message queue.

$callbacks handle_message(Msg, State) → NewState = act_on_msg(Msg,State) {noreply, NewState};$

MQ perspective
Exchange
Exchange
“Fanout”
MSG
MSG
MSG
MSG
MSG
MSG
MSG
MSG
MSG
MSG
MSG
MSG

Live demo
Wireless Network:
Name: rabbit
Password: carrot
VISIT:
http://10.1.1.1:8081/

Benchmarking
Method:
Connect to Websocket
Wait for signal.
Send 100 messages.
Receive all messages

Benchmarking
Results:
(Didn't get this done in time, sorry)
0.5 1 1.5 2 2.5 3 3.5 4 4.5
0
2
4
6
8
10
12
Column 1
Column 2
Column 3

Source Code
github.com/wmealing/
bunny-cowboy-websocket

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