http://github.com/mojombo/erlectricity
By Scott Fleckenstein, Tom Preston-Werner
Development Status: Production/Stable
Erlectricity allows a Ruby program to receive and respond to Erlang messages sent over the Erlang binary protocol.
$ gem install erlectricity
-or-
$ gem install mojombo-erlectricity -s http://gems.github.com
require 'rubygems'
require 'erlectricity'
receive do |f|
f.when([:echo, String]) do |text|
f.send!([:result, "You said: #{text}"])
f.receive_loop
end
end
-module(echo).
-export([test/0]).
test() ->
Cmd = "ruby echo.rb",
Port = open_port({spawn, Cmd}, [{packet, 4}, nouse_stdio, exit_status, binary]),
Payload = term_to_binary({echo, <<"hello world!">>}),
port_command(Port, Payload),
receive
{Port, {data, Data}} ->
{result, Text} = binary_to_term(Data),
io:format("~p~n", [Text])
end.
% Port is the port opened via open_port({spawn, Cmd}, [{packet, 4}, ...])
% Message is the Erlang term to encode and send to the port
send(Port, Message) ->
port_command(Port, term_to_binary(Message)).
# Each triplet below represents:
# (line 1) the Erlang call
# (line 2) the Ruby matcher
# (line 3) the Ruby output
send(Port, test).
f.when(:test) { p :ok }
# :ok
send(Port, {atom, symbol}).
f.when([:atom, Symbol]) { |sym| p sym }
# :symbol
send(Port, {number, 1}).
f.when([:number, Fixnum]) { |num| p num }
# 1
send(Port, {string, <<"foo">>}).
f.when([:string, String]) { |str| p str }
# "foo"
send(Port, {array, [1,2,3]}).
f.when([:array, Array]) { |arr| p arr }
# [1, 2, 3]
send(Port, {array, [<<"abc">>, <<"def">>]}).
f.when([:array, Array]) { |arr| p arr }
# ["abc", "def"]
send(Port, {hash, [{key,val}]}).
f.when([:hash, Erl.hash]) { |hash| p hash }
# {:key=>:val}
send(Port, {object, {1,{2},3,<<"four">>}}).
f.when([:object, Any]) { |any| p any }
# [1, [2], 3, "four"]
If you'd like to hack on Erlectricity, start by forking my repo on GitHub:
http://github.com/mojombo/erlectricity
To get all of the dependencies, install the gem first. The best way to get your changes merged back into core is as follows:
- Clone down your fork
- Create a topic branch to contain your change
- Hack away
- Add tests and make sure everything still passes by running
rake - If you are adding new functionality, document it in the README.md
- Do not change the version number, I will do that on my end
- If necessary, rebase your commits into logical chunks, without errors
- Push the branch up to GitHub
- Send me (mojombo) a pull request for your branch
Copyright (c) 2009 Scott Fleckenstein and Tom Preston-Werner. See LICENSE for details.