Erlang gen_tcp:listen/2 for IPv6

Question

我有。net TCP发送者发送到一个Erlang接收者。. net组件在解析localhost时喜欢使用IPv6地址::1。我不太确定如何让Erlang使用gen_tcp侦听IPv6地址。这是我的尝试。我是否告诉了错误的插座进行侦听?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

您实际遇到的问题是什么?

您应该将套接字的控制进程设置为您生成的使用该连接的进程。在accept/2中，你可以这样写:

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);
...

另一种编写accept循环的方法是生成新的accept循环。你会得到这样的东西:

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

没有错误处理。您可以将监听套接字传递给其他进程而不会出现问题。当然，如果打开监听套接字的进程死亡，则该套接字将被关闭。