最近我遇到了一个很棒的perl模块“AnyEvent”,它允许用户进行异步/事件驱动的编程.
创建了以下代码片段,工作正常.我遇到的问题是,在打开并关闭许多套接字后,它很快耗尽了所有客户端端口(“netstat -ant”显示20,000个套接字处于TIME_WAIT状态).
$hdl = new AnyEvent::Handle (
connect => [$ip,$port],on_connect=> sub {
my ($handle,$host,$port,$tmp) = @_;
#print "connect routine for $handle->{ue}\r\n";
#update states.
},on_read => sub {
my $hdl = $_[0];
#read data
#send response.
});
我想知道是否可以使用IO :: Socket :: INET创建TCP套接字,然后在AnyEvent :: Handle中使用新创建的套接字：
my $sock = IO::Socket::INET->new( Proto => 'tcp',PeerAddr => $ue->{vars}->{ip},PeerPort => $ue->{vars}->{dstPort},ReusePort => 1,KeepAlive => 1
) || die "Failed to setup outsock $@\n";
$hdl = new AnyEvent::Handle (
fh => $sock,on_read => sub {
my $hdl = $_[0];
#read data
#send response.
});
尝试过,但它不起作用.感谢任何建议/意见.
感谢ikegami调查并提出了建议.但是,似乎SO_REUSEADDR没有生效.这是我使用的代码(基于他的建议)
use strict;
use warnings;
use AnyEvent qw( );
use AnyEvent::Handle qw( );
use AnyEvent::Impl::EV qw( );
use AnyEvent::Socket qw( tcp_connect );
use Socket qw( SOL_SOCKET SO_REUSEPORT SO_REUSEADDR);
my $ts = 0;
my $trans = 0;
my $currentTS;
sub transaction {
my ($host,$port) = @_;
tcp_connect($host,sub {
my ($sock) = @_
or die "Can't connect: $!";
my $handle;
$handle = AnyEvent::Handle->new(
fh => $sock,on_eof => sub {
$handle->destroy();
},on_read => sub {
my ($handle) = @_;
#print $handle->rbuf();
$trans ++;
$currentTS = time();
if ($currentTS > $ts) {
$ts = $currentTS;
print "$trans\n";
}
#printf "recved %d bytes of data\n",length($handle->rbuf);
# This should continue to read until header +
# Content-Length bytes have been read instead
# of stopping after one read.
if (length($handle->rbuf) > 0) {
$handle->destroy();
}
},);
$handle->push_write("GET /s HTTP/1.1\r\nHost: $host\r\n\r\n");
#$handle->push_shutdown(); # Done writing.
},sub {
my ($sock) = @_;
#setsockopt($sock,SOL_SOCKET,SO_REUSEPORT,1) or die $!;
setsockopt($sock,SO_REUSEADDR,1) or die $!;
# die "Failed to set linger $!\n";
return undef;
});
}
{
my $cv = AnyEvent->condvar();
my $t = AnyEvent->timer(after=>0.001,interval=>1,cb=> sub {
transaction("10.3.0.6",80 );
});
$cv->recv();
}
我的系统是Ubuntu 11.04.
在目录/ proc / sys / net / ipv4中,这是两个文件的内容：
% more tcp_tw_recycle
1
％tcp_tw_reuse
1
解决方法
我无法运行以下内容,因为Windows不提供SO_REUSEPORT,但我非常确信以下内容可以满足您的要求.
那就是说,我不确定它会有所帮助.根据我的阅读,SO_REUSEPORT允许您绑定到已经活动的端口,但是您没有绑定到任何端口.
use strict; use warnings; use AnyEvent qw( ); use AnyEvent::Handle qw( ); use AnyEvent::Impl::EV qw( ); use AnyEvent::Socket qw( tcp_connect ); use Socket qw( SOL_SOCKET SO_REUSEPORT );
sub transaction {
my ($host,on_read => sub {
my ($handle) = @_;
print $handle->rbuf();
# This should continue to read until header +
# Content-Length bytes have been read instead
# of stopping after one read.
$handle->destroy();
},);
$handle->push_write("GET / HTTP/1.1\r\nHost: $host\r\n\r\n");
$handle->push_shutdown(); # Done writing.
},sub {
my ($sock) = @_;
setsockopt($sock,1)
or die $!;
return undef;
});
}
{
my $cv = AnyEvent->condvar();
my $t = AnyEvent->timer(after=>0.001,interval=>0.001,cb=> sub {
transaction("localhost",$ARGV[0] // die("usage"));
});
$cv->recv();
}
用于测试的服务器：
use strict;
use warnings;
use 5.010;
use IO::Socket::INET qw( );
use Socket qw( inet_ntoa );
my $serv = IO::Socket::INET->new(
Listen => 1,);
say inet_ntoa($serv->sockaddr) . ":" . $serv->sockport;
while (my $client = $serv->accept()) {
say "Connection from ".inet_ntoa($client->peeraddr).":".$client->peerport;
while (<$client>) {
last if /^(?:\r?\n)?\z/;
}
say $client "HTTP/1.1 200 OK\r\n"
. "Content-Type: text/plain\r\n"
. "\r\n"
. "Hello\n";
say " done.";
}