Re: sending data over TCP channel using POE::Component::Server::TCP

Are you sure you want to be using sysread? Something about this doesn't feel right.

    ClientConnected => sub {
      print "got a connection from $_[HEAP]{remote_ip}\n";
      open(INFILE,"./file") or die "Open fail";
      sysread(INFILE,my $buffer='',65535);               
      $_[HEAP]{client}->put($buffer);     
    },
[download]

Either way, there's an awful lot of code in your post. I couldn't begin to guess where the problem is. Perhaps you could narrow it down to a smaller example?

I do recall having various problems with the TCP classes. IIRC, I ended up writing a POE::Filter (which you plug in with the ClientFilter keyvar) that encoded unprintable characters and CRFLs into a format that wouldn't mess with line buffering and the problems went away. Technically the filter also encrypted the messages...

package cbcfilter;

use strict;
use POE::Filter;
use Crypt::CBC;
use MIME::Base64;
use CGI qw(escape unescape);

our @ISA = qw(POE::Filter);
use Carp qw(carp croak);

sub BUFFER () { 0 }
sub CIPHER () { 1 }

# NOTE: no worries, $filter->clone() gets called for every new client 
+and this
# bless is completely compatible with the clone we inherit from the IS
+A ablove
# (including clearing the buffer). :)

sub new {
    my $class = shift;
    my $file  = shift;
    my $obtai = shift;

    my $key;
    if( $file and -f $file ) {
        open my $keyio, $file or croak "couldn't open keyfile=\"$file\
+": $!"; local $/ = undef;
        my $entire_key = <$keyio>;
        close $keyio;

        $key = decode_base64( $entire_key );
    }
    croak "no keyfile specified or no key found inside it (file=$file)
+" unless $key;

    my $cbc = Crypt::CBC->new({ key=>$key, cipher=>'Blowfish', header=
+>"randomiv" });

    return bless [ '', $cbc ], $class;
}

sub get_one_start {
    my ($this, $stream) = @_;

    local $" = "";
    $this->[BUFFER] .= "@$stream";
}

sub get_one {
    my $this = shift;

    if( $this->[BUFFER] =~ s/<msg>([^<>]*)<\/msg>//s ) {
        my $msg = $1;
        return [] unless length $msg and $msg =~ m/RandomIV/;
        return [ $this->[CIPHER]->decrypt( unescape($msg) ) ];
    }

    return [];
}

sub put {
    my ($this, $msgs) = @_;
    my $cbc = $this->[CIPHER];

    my @ret = ();
    for my $msg ( @$msgs ) {
        $msg = escape( $cbc->encrypt($msg) );

        push @ret, "<msg>$msg</msg>";
    }

    return \@ret;
}

sub get_pending {
    my $this = shift;
    return [ $this->[BUFFER] ] if length $this->[BUFFER];
    return undef;
}

1;
[download]

I always expected I was missing something though. I don't think it's line buffered.

-Paul

Comment on Re: sending data over TCP channel using POE::Component::Server::TCP Select or Download Code

Replies are listed 'Best First'.
Re^2: sending data over TCP channel using POE::Component::Server::TCP by cta (Acolyte) on Jul 30, 2008 at 15:36 UTC
Thanks Paul. I hope the code example is better now. sysread was the first thing come into my mind when I tried to serialize the content of my file, get a string and send it out. It seems to work just fine before this line `$_[HEAP]{client}->put($buffer);` The problem appears when I send this string to other side. It got chunked somewhere, I didn't receive the whole packet. I think the size of the sending data might have been fix at a certain maximum. I'm not sure... I don't know if using POE::Filter will fix it. I'll take a look.	[reply] [d/l]

Replies are listed 'Best First'.

Re^2: sending data over TCP channel using POE::Component::Server::TCP
by cta (Acolyte) on Jul 30, 2008 at 15:36 UTC

$_[HEAP]{client}->put($buffer);

[reply]
[d/l]