Traffic Light

Summary

A simple REST service which is designed to help people in their fight with broken traffic lights...

Requirements

• Erlang R17.0 or higher
• Ruby with fpm gem installed

How to Build and Run

  $ git clone https://github.com/av-ast/traffic-light.git
  $ cd traffic-light
  $ make run

In development mode you should run the following:

  $ make dev_run

... and sync will do all the rest for you.

How to create a deb-package

make deb

How to run tests

make test

Settings

File <REPO ROOT>/apps/traffic_light/src/erl_proxy.app.src stores some application specific settings:

[
  {cowboy_port, 5000},           % Cowboy listeners' port
  {cowboy_acceptors_num, 100},   % Number of Cowboy requests acceptors
].

API

Create sequence:

curl -XPOST -v -d {} http://127.0.0.1:5000/sequence/create

{"status":"ok","response":{"sequence":"3b892010-5cf5-11e4-aa08-c42c0309b2de"}}

Add observation:

curl -XPOST -d '{"observation":{"color":"green","numbers":["1110111","0010110"]}, "sequence":"3b892010-5cf5-11e4-aa08-c42c0309b2de"}' http://127.0.0.1:5000/observation/add

{"status":"ok","response":{"start":[0,8],"missing":["0000000","1101001"]}}

Clear all sequences and observations:

curl http://127.0.0.1:5000/clear

{"status":"ok","response":"ok"}

Get statistics related to ETS (consumed memory and objects count):

curl http://127.0.0.1:5000/stats

{"status":"ok","response":{"ets_objects_count":0,"ets_words_count":305}}

P.S. I want to say a special thanks to @afiskon for his article and example of how to make a production ready packaging system for Erlang applications.