Skip to main content


Project description


Erlastic allows you to serialize/deserialize python objects into erlang binary term.

Basic usage is :

import erlastic
py_struct = erlastic.decode(binary_term)
binary = erlastic.encode(py_struct)

Erlang Port communication usage

The library contains also a function to use python with erlastic in an erlang port to communicate erlang binary term : port_communication() which return (mailbox,port). They are both python coroutines (executed generator) so you can communicate with erlang coroutine using python abstractions :

So for instance, if you want to create a Python server which receives the tuple {A,B} and return {ok,A/B} of {error,divisionbyzero} you can use at the python side :

from erlastic import port_connection,Atom as A
mailbox,port = port_connection()

for (a,b) in mailbox:
  port.send((A("ok"),a/b) if b!=0 else (A("error"),A("divisionbyzero")))

and at the erlang side, use -u python parameter to prevent python output buffering, use 4 bytes packet length because it is the configuration used by the python generators.

Port = open_port({spawn,"python3 -u"},[binary,{packet,4}]),
Div = fun(A,B)->
  Port ! {self(),{command,term_to_binary({A,B})}},
  receive {Port,{data,Bin}}->binary_to_term(Bin) after 1000->{error,timeout} end
io:format("send {A,B}=~p, python result : ~p~n",[{32,10},Div(32,10)]),
io:format("send {A,B}=~p, python result : ~p~n",[{2,0},Div(2,0)]),
io:format("send {A,B}=~p, python result : ~p~n",[{1,1},Div(1,1)])

or in elixir :

port ={:spawn,'python3 -u'},[:binary|[packet: 4]])
div = fn(a,b)->
  port <- {self,{:command,term_to_binary({a,b})}}
  receive do {_,{:data,b}} -> binary_to_term(b) after 100->{:error,:timeout} end
IO.puts "send {a,b}={32,10}, python result : #{inspect div.(32,10)}"
IO.puts "send {a,b}={2,0}, python result : #{inspect div.(2,0)}"
IO.puts "send {a,b}={1,1}, python result : #{inspect div.(1,1)}"

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

basho-erlastic-2.1.1.tar.gz (9.3 kB view hashes)

Uploaded source

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page