Created
September 28, 2017 22:50
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non-blocking, non-forking, single thread perl tcp server
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use IO::Socket::INET; | |
use IO::Select; | |
use POSIX; | |
print "starting on $ARGV[0]\n"; | |
$| = 1; | |
my $select = new IO::Select; | |
my $socket = new IO::Socket::INET( | |
LocalAddr => '0.0.0.0', | |
LocalPort => $ARGV[0], | |
Listen => 5, | |
Blocking => 0, | |
Proto => 'tcp', | |
Reuse => 1) or die "could not set up socket $!\n"; | |
$select->add($socket); | |
my %inbuffer = (); | |
my %outbuffer = (); | |
my %ready = (); | |
sub setnonblock { | |
my $socket = shift; | |
my $flags; | |
$flags = fcntl($socket, F_GETFL, 0) | |
or die "Can't get flags for socket: $!\n"; | |
fcntl($socket, F_SETFL, $flags | O_NONBLOCK) | |
or die "Can't make socket nonblocking: $!\n"; | |
} | |
while(1) { | |
foreach my $client ($select->can_read(1)) { | |
if($client == $socket) { | |
$client = $socket->accept(); | |
$select->add($client); | |
setnonblock $client; | |
} else { | |
my $count = $client->recv(my $data, POSIX::BUFSIZ, 0); | |
unless (defined($count) && length $data) { | |
delete $inbuffer{$client}; | |
delete $outbuffer{$client}; | |
delete $ready{$client}; | |
$select->remove($client); | |
close $client; | |
next; | |
} | |
$inbuffer{$client} .= $data; | |
if ($inbuffer{$client} =~ s/(.*\n)//) { | |
$outbuffer{$client} = "I got $1"; #handle stuff here as you like | |
} | |
} | |
} | |
foreach my $client ($select->can_write(1)) { | |
next unless exists $outbuffer{$client}; | |
my $count = $client->send($outbuffer{$client}, 0); | |
if ($count == length $outbuffer{$client} || | |
$! == POSIX::EWOULDBLOCK) { | |
substr($outbuffer{$client}, 0, $count) = ''; | |
delete $outbuffer{$client} unless length $outbuffer{$client}; | |
} | |
next unless (defined $count); | |
} | |
} |
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