ERLANG和PYTHON互通实现过程详解

Python  /  管理员 发布于 7年前   173

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。) )

-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().

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 sysdef 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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