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README.md

A web interface to run or compile Erlang code

Built with Docker, PostgreSQL and Cowboy.

It is hosted at http://tryerl.seriyps.ru/.

HTTP API

It supports x-www-form-urlencoded as well as json payload.

There are 3 endpoints:

  • evaluate
  • compile
  • pastebin

Evaluate

Evaluates Erlang code and prints it's stdout and process return code.

JSON

curl -i -d '{"code":"-module(main). -export([main/0]). main() -> io:format(\"Hello, world!\").","release":"21.3"}' -H "Content-Type: application/json" http://tryerl.seriyps.ru/api/evaluate

x-www-form-urlencoded

curl -i -d 'code=-module(main).%20-export(%5Bmain%2F0%5D).%20main()%20-%3E%20io%3Aformat(%22Hello%2C%20world!%22).&release=21.3' http://tryerl.seriyps.ru/api/evaluate

Compile

Compiles Erlang code to different forms and prints compilation result.

JSON

curl -i -d '{"code":"-module(main). -export([main/0]). main() -> io:format(\"Hello, world!\").","release":"21.3","emit":"beam"}' -H "Content-Type: application/json" http://tryerl.seriyps.ru/api/compile

x-www-form-urlencoded

curl -i -d 'code=-module(main).%20-export(%5Bmain%2F0%5D).%20main()%20-%3E%20io%3Aformat(%22Hello%2C%20world!%22).&release=21.3&emit=beam' http://tryerl.seriyps.ru/api/compile

Pastebin

Basic pastebin to store and retrieve code snippets.

JSON

curl -i -d '{"code":"-module(main). -export([main/0]). main() -> io:format(\"Hello, world!\").","release":"21.3","emit":"beam"}' -H "Content-Type: application/json" http://tryerl.seriyps.ru/api/pastebin

x-www-form-urlencoded

curl -i -d 'code=-module(main).%20-export(%5Bmain%2F0%5D).%20main()%20-%3E%20io%3Aformat(%22Hello%2C%20world!%22).&release=21.3&emit=beam' http://tryerl.seriyps.ru/api/pastebin

New pastebin ID / URL will be returned in Location HTTP header.

Paste contents can be queried by this URL. HTTP Accept header is respected. Supported values are application/x-www-form-urlencoded (default) and application/json.

curl -i -H "Accept: application/json" http://tryerl.seriyps.ru/api/pastebin/<paste id>

Deployment

Create new Ansible variables file

cp deploy/vars_example.yml deploy/vars.yml
nano deploy/vars.yml

Create Ansible inventory file

It should have playpen host.

nano deploy/hosts

Run ansible

ansible-playbook -D -K -i deploy/hosts deploy/main.yml

Be careful to not run it with postgres tag agin - it may wipe your pastebin database! Use --skip-tags postgres for re-deployment / upgrades. --tags=src,conf,erl_version,release,start for OTP version updates.

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