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lib/App/HTTP_Proxy_IMP/Relay.pm  view on Meta::CPAN

use strict;
use warnings;

package App::HTTP_Proxy_IMP::Relay;
use fields (
    'fds',      # file descriptors
    'conn',     # App::HTTP_Proxy_IMP::HTTPConn object
    'acct',     # collect accounting
);

use App::HTTP_Proxy_IMP::Debug;
use Scalar::Util 'weaken';
use IO::Socket::SSL;
use AnyEvent;
use POSIX '_exit';

# set if the child should destroy itself after last connection closed
my $exit_if_no_relays;
sub exit_if_no_relays { $exit_if_no_relays = pop; }

# active relay, inserted in new, removed in $idlet timer
my @relays;
sub relays { return grep { $_ } @relays }

# creates new relay and puts it into @relays as weak reference
sub new {
    my ($class,$cfd,$upstream,$conn) = @_;
    my $self = fields::new($class);
    debug("create relay $self");

    if ( $upstream && ! ref($upstream)) {
	$upstream =~m{\A(?:\[([a-f\d:.]+)\]|([\da-z_\-.]+)):(\d+)\Z} or
	    die "invalid upstream specification: $upstream";
	$upstream = [ $1||$2, $3 ];
    }

    my $cobj = $conn->new_connection({
	daddr => $cfd->sockhost,
	dport => $cfd->sockport,
	saddr => $cfd->peerhost,
	sport => $cfd->peerport,
	upstream => $upstream,
    },$self);

    #debug("create connection $cobj");
    $self->{conn} = $cobj;
    my $cfo = $self->{fds}[0] = App::HTTP_Proxy_IMP::Relay::FD->new(0,$cfd,$self,1);
    $cfo->mask( r => 1 ); # enable read 

    push @relays, $self;
    weaken($relays[-1]);

    return $self;
}

sub DESTROY {
    my $self = shift;
    $self->account('destroy');
    $self->xdebug("destroy relay $self");
    if ( $exit_if_no_relays && ! $self->relays ) {
	# der letzte macht das Licht aus
	debug("exit child $$ after last connection");
	_exit(0)
    }
}

sub acctinfo {
    my ($self,$acct) = @_;
    $self->{acct} = $acct;
}
sub account {
    my ($self,$what,%args) = @_;
    my $acct = $self->{acct};
    $acct = $acct ? { %$acct,%args } : \%args if %args;
    $acct or return;
    $self->{acct} = undef;
    if ( my $t = delete $acct->{start} ) {
	$acct->{duration} = AnyEvent->now - $t;
    }
    my @msg;
    for( sort keys %$acct ) {

lib/App/HTTP_Proxy_IMP/Relay.pm  view on Meta::CPAN

# shutdown part of relay
sub shutdown:method {
    my ($self,$dir,$rw,$force) = @_;
    my $fo = $self->{fds}[$dir] or return;
    $fo->shutdown($rw,$force);
}

# check for condition, where we cannot transfer anymore data:
# - nowhere to read and no open requests
# - nowhere to write too
sub closeIfDone {
    my $self = shift;
    my $sink = my $drain = '';
    for my $fo (@{$self->{fds}}) {
	$fo && $fo->{fd} or next;
	return if $fo->{rbuf} ne ''; # has unprocessed data
	return if $fo->{wbuf} ne ''; # has unwritten data
	$drain .= $fo->{dir} if not $fo->{status} & 0b100; # not read-closed
	$sink  .= $fo->{dir} if not $fo->{status} & 0b010; # not write-closed
    }

    if ( $sink eq '' ) {      # nowhere to write
	$DEBUG && $self->xdebug( "close relay because all fd done sink='$sink' ");
	# close relay
	return $self->close;
    }

    if ( $drain ne '01' ) {  # no reading from both sides
	my $conn = $self->{conn};
	if ( ! $conn or ! $conn->open_requests ) {
	    # close relay
	    $DEBUG && $self->xdebug( "close relay because nothing to read and all done");
	    return $self->close;
	}
    }

    $DEBUG && $self->xdebug("drain=$drain sink=$sink rq=".$self->{conn}->open_requests." - keeping open");
    return;
}


# dump state to debug
sub dump_state {
    my $self = shift;
    my $conn = $self->{conn};
    my $msg = '';
    if ( my $fds = $self->{fds} ) {
        my @st;
        for( my $i=0;$i<@$fds;$i++) {
            push @st, sprintf("%d=%03b",$i,$fds->[$i]{status} || 0);
        }
	$msg .= " fd:".join(',',@st);
    }
    $msg = $conn->dump_state().$msg;
    return $msg if defined wantarray;
    debug($msg);
}


my $idlet = AnyEvent->timer( 
    after => 5, 
    interval => 5, cb => sub {
        @relays = grep { $_ } @relays or return;
        #debug("check timeouts for %d conn",+@relays);
        my $now = AnyEvent->now;
	RELAY: for my $r (@relays) {
	    # timeout depends on the state of the relay and child
	    # if there are active requests set it to 60, if not (e.g.
	    # idle keep-alive connections) to 30. If this is a forked
	    # child with no listener which should close after all
	    # requests are done close idle keep-alive connections faster,
	    # e.g. set timeout to 1
	    my $idle = ! $r->{conn}->open_requests;
	    my $timeout = 
		! $idle ? 60 :
		$exit_if_no_relays ? 1 :
		30;
	    for my $fo (@{$r->{fds}}) {
		next RELAY if $_->{didit} + $timeout > $now;
	    }
	    $r->xdebug("close because of timeout");
            $r->close
        }
    }
);

############################################################################
# Filehandle
############################################################################

package App::HTTP_Proxy_IMP::Relay::FD;
use Carp 'croak';
use Scalar::Util 'weaken';
use App::HTTP_Proxy_IMP::Debug;
use AnyEvent::Socket qw(tcp_connect format_address);
use IO::Socket::SSL;

use fields (
    'dir',        # direction 0,1
    'fd',         # file descriptor
    'host',       # destination hostname
    'status',     # bitmap of read_shutdown|write_shutdown|connected
    'relay',      # weak link to relay
    'didit',      # time of last activity (read/write)
    'rbuf',       # read buffer (read but not processed)
    'rsub',       # read handler
    'rwatch',     # AnyEvent watcher - undef if read is disabled
    'wbuf',       # write buffer (not yet written to socket)
    'wsub',       # write handler
    'wwatch',     # AnyEvent watcher - undef if write is disabled
    'wsrc',       # source of writes for stalled handling
);

sub new {
    my ($class,$dir,$fd,$relay,$connected) = @_;
    my $self = fields::new($class);
    $self->{dir} = $dir;
    $self->{fd} = $fd;
    $self->{status} = $connected ? 0b001 : 0;
    #weaken( $self->{relay} = $relay );