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Erlang和Python互通

最近开发 Erlang ,对其字符串处理能力无言至极,于是决定把它和python联合起来,打造一个强力的分布式系统,等将来需要系统级开发时,我再把 C++/C组合进来.

首先参考了 Erlang 官方文档和 http://blog.developers.api.sina.com.cn/?tag=erlang 以及 http://kazmier.net/computer/port-howto/ .

研读了将近24个小时, 才终于完全把问题解决.  起名为town，town在英文里表示集市，也就是代表各种语言在这里的交流与互动。) )

[erl]-module(town).

-behaviour(gen_server).

%% API

-export([start/0,combine/1]).

%% gen_server callbacks

-export([init/1, handle_call/3, handle_cast/2, handle_info/2,

terminate/2, code_change/3]).

-record(state, {port}).

start() ->

gen_server:start_link({global, ?MODULE}, ?MODULE, [], []).

stop() ->

gen_server:cast(?SERVER, stop).

init([]) ->

process_flag(trap_exit, true),

Port = open_port({spawn, "python -u /home/freefis/Desktop/town.py"},[stream,{line, 1024}]),

{ok, #state{port = Port}}.

handle_call({combine,String}, _From, #state{port = Port} = State) ->

port_command(Port,String),

receive

{Port,{data,{_Flag,Data}}} ->

io:format("receiving:~p~n",[Data]),

sleep(2000),

{reply, Data, Port}

end.

handle_cast(stop, State) ->

{stop, normal, State};

handle_cast(_Msg, State) ->

{noreply, State}.

handle_info(Info, State) ->

{noreply,State}.

terminate(_Reason, Port) ->

ok.

code_change(_OldVsn, State, _Extra) ->

{ok, State}.

%%——————————————————————–

%%% Internal ———————————————————

combine(_String) ->

start(),

String = list_to_binary("combine|"++_String++"\n"),

gen_server:call(?SERVER,{combine,String},infinity),

stop().[/erl]

这段是Python的脚本 当erlang中town:combine(“sentence1+sentence2”)执行时，会在后台启动python的脚本，处理完毕后返回给Erlang结果:sentence1sentence2，然后退出。 

import sys
def handle(_string):
    if _string.startswith("combine|"):
        string = "".join( _string[8:].split(","))
        return string

"""waiting for input """
while 1:
    # Recv. Binary Stream as Standard IN
    _stream = sys.stdin.readline()

if not _stream: break
    # Scheme, Turn into  Formal String
    inString  = _stream.strip("\r\n")
    # handle String
    outString = handle(inString)
    # send to port as Standart OUT
    sys.stdout.write("%s\n" % (outString,))
    sys.exit(0)

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