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)
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 :
mailboxwaits for port message in stdin, iterating over messages decoded from binary erlang term format.portwaits forsend(python_struct)(http://docs.python.org/3.3/reference/expressions.html#generator.send) then encodepython_structinto binary term format and send it to the erlang port via stdout.
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 add_server.py"},[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
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 = Port.open({:spawn,'python3 -u add_server.py'},[: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
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)}"
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