For completeness (or overkill, if you prefer), here's a version with no blocking reads
that can handle multiple clients with overlapped packets and only processes a packet when it is complete.
It does that by using a hash to store partial data per connection until a complete packet arrives.
#!/usr/bin/perl
use strict; # https://perlmonks.org/?node_id=11134663
use warnings;
use IO::Socket;
use IO::Select;
my %data;
my $listen = IO::Socket::INET->new( LocalPort => 8080,
Listen => 256, Reuse => 1) or die $@;
my $sel = IO::Select->new($listen);
sub checkforrequests
{
for my $fh ( $sel->can_read(0) ) # 0 for poll
{
if( $fh == $listen )
{
my $socket = $listen->accept;
$data{$socket} = '';
$sel->add( $socket );
print "new client $socket\n";
}
elsif( sysread $fh, $data{$fh}, 4096, length $data{$fh} )
{
if( $data{$fh} =~ s/^(.*?\n\r?\n)//s ) # any whole HTTP commands
{
my $command = $1;
print $command =~ s/^/got HTTP packet: /gmr;
# FIXME process request here
print $fh "OK\n"; # FIXME sample response
shutdown $fh, 1;
$command =~ /quit/ and die "exiting on 'quit' command\n";
}
}
else
{
delete $data{$fh};
$sel->remove( $fh );
print "client left $fh\n";
}
}
}
while( 1 ) # your loop as I understand it
{
select undef, undef, undef, 0.2; # FIXME your non-network stuff
checkforrequests(); # this is added to your loop
}
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