Tsung plugin for WebSockets
Erlang Python
Latest commit 4395d4e Sep 16, 2012 @wulczer Support setting an Origin header when connecting.
Some servers accept or reject connections based on the Origin header
and so the client needs to have an option to set it.


WebSockets for Tsung

A plugin for Tsung (http://tsung.erlang-projects.org/) for load-testing WebSockets servers.

Draws inspiration from the tsung_websocket project (https://github.com/onlychoice/tsung_websocket), various other Erlang WebSockets implementations and the Tsung plugin tutorial (http://www.process-one.net/en/wiki/Writing_a_Tsung_plugin/).


Why not just build on tsung_websockets? The reasons are:

  • for some reason it didn't work out of the box
  • it supports WebSockets as a transport protocol so you can run others like XMPP on top of it, and I didn't need that
  • it includes a lot of unrelated code
  • I wanted to try Erlang


Get the source and build dependencies for Tsung. On Debian use:

apt-get source tsung
sudo apt-get build-dep tsung

For Ubuntu or other distros you'll have to download the source from upstream:

sudo apt-get install erlang-nox python-matplotlib gnuplot libtemplate-perl openssh-client openssh-server
wget http://tsung.erlang-projects.org/dist/tsung-1.4.2.tar.gz
tar xzf tsung-1.4.2.tar.gz

Copy the DTD and provided Erlang files from tsung_ws to the Tsung source tree:

cp tsung_ws/tsung-1.0.dtd tsung-x.x.x/
cp tsung_ws/include/ts_websocket.hrl tsung-x.x.x/include/
cp tsung_ws/src/tsung_controller/ts_config_websocket.erl tsung-x.x.x/src/tsung_controller/
cp tsung_ws/src/tsung/ts_websocket.erl tsung-x.x.x/src/tsung/

Compile Tsung:

cd tsung-x.x.x/
./configure --prefix=$HOME/local/tsung
make install

Tsung uses SSH to launch monitoring and controller processes, make sure your user can connect to localhost without needing a password (this assumes you have generated an SSH key before):

cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys

Start the example Python WebSockets server (you will need Twisted and a fork of txWebSocket) and run Tsung using the provided configuration file:

sudo apt-get install python-twisted
sudo pip install -e git://github.com/wulczer/txWebSocket.git#egg=txWebSocket
cd ../tsung_ws/
python math_server.py
$HOME/local/tsung/bin/tsung -f websocket.xml -m /tmp/tsung.log start

After the run is done, you can generate an HTML report:

mkdir report
cd report
$HOME/local/tsung/lib/tsung/bin/tsung_stats.pl --stats /tmp/tsung.log

Loose ends

More error checking, handling continuation and binary frames, better logging.