Question

我有.NET TCP发送器发送到Erlang接收器。 .NET组件喜欢在解析::1时使用IPv6地址localhost。我不太确定如何让Erlang使用gen_tcp监听IPv6地址。这是我的尝试。我告诉错误的套接字进行收听吗？谢谢！

listen(Config) ->
    PortString = Config#cfg.eventbusport,
    GoodPort = check_int(PortString),
    Port = if GoodPort -> 
               list_to_integer(PortString);
           true ->
               ?DEFAULT_PORT
           end,                      %% IPv6 here --->
    {ok, XSocket} = gen_tcp:listen(Port, [binary, {packet, line}, {active, false}, {reuseaddr, true}, inet6, {ip, {0,0,0,0,0,0,0,1}}])
    end,
    accept(XSocket, Config).

accept(LSocket, Config) ->
    case gen_tcp:accept(LSocket) of
        {ok, Socket} ->
            spawn_link(fun() -> loop(Socket, Config) end),
            accept(LSocket, Config);
        {error, closed} ->
            logger("Accept: Closed socket.",[],1),
            listen(Config)
    end.

loop(Socket, Config) ->
    case inet:setopts(Socket, [{recbuf, 64000}]) of
        ok ->
            case gen_tcp:recv(Socket, 0) of
                {ok, Data} ->
                    SplitData = binary:split(Data,?CRLF,[global]),
                    discrim(SplitData, Config),
                    loop(Socket, Config);
                {error, closed} ->
                    logger("Loop: Closed socket.",[],1),
                    ok
            end;
        {error, Reason} ->
            logger("ERROR: Couldn't set the recbuf to 64k! Because ~p",[Reason],1)
    end.

Answer 1

您遇到的实际问题是什么？

您应该将套接字的控制过程设置为您生成的进程以使用该连接。所以在你的accept/2中你会做类似的事情：

accept(LSocket, Config) ->
    case gen_tcp:accept(LSocket) of
        {ok, Socket} ->
            Pid = spawn_link(fun() -> loop(Socket, Config) end),
            gen_tcp:controlling_process(Socket, Pid),
            accept(LSocket, Config);
...

编写接受循环的另一种方法是生成新的接受循环。你会得到类似的东西：

accept_loop(LSocket, Config) ->
    {ok,Socket} = gen_tcp:accept(LSocket),
    spawn_link(fun() -> accept_loop(LSocket, Config) end),
    loop(Socket, Config).

这没有错误处理。您可以将listen套接字传递给其他进程而不会出现问题。当然，如果打开listen套接字的进程死掉，那么套接字就会关闭。

Erlang gen_tcp：listen / 2 for IPv6

1 个答案: