Metadata-Version: 1.1
Name: basho-erlastic
Version: 2.1.1
Summary: Erlastic
Home-page: http://github.com/basho/python-erlastic
Author: Samuel Stauffer, Basho Technologies
Author-email: clients@basho.com
License: UNKNOWN
Description: Erlastic
        ========
        
        Usage
        -----
        
        Erlastic allows you to serialize/deserialize python objects into `erlang
        binary term <http://erlang.org/doc/apps/erts/erl_ext_dist.html>`__.
        
        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 :
        
        -  ``mailbox`` waits for port message in stdin, iterating over messages
           decoded from binary erlang term format.
        -  ``port`` waits for ``send(python_struct)``
           (http://docs.python.org/3.3/reference/expressions.html#generator.send)
           then encode ``python_struct`` into 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)}"
        
Platform: UNKNOWN
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Requires: six
