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|
package HTTP::Proxy::Engine::Legacy;
use strict;
use POSIX 'WNOHANG';
use HTTP::Proxy;
our @ISA = qw( HTTP::Proxy::Engine );
our %defaults = (
max_clients => 12,
);
__PACKAGE__->make_accessors( qw( kids select ), keys %defaults );
sub start {
my $self = shift;
$self->kids( [] );
$self->select( IO::Select->new( $self->proxy->daemon ) );
}
sub run {
my $self = shift;
my $proxy = $self->proxy;
my $kids = $self->kids;
# check for new connections
my @ready = $self->select->can_read(1);
for my $fh (@ready) { # there's only one, anyway
# single-process proxy (useful for debugging)
if ( $self->max_clients == 0 ) {
$proxy->max_keep_alive_requests(1); # do not block simultaneous connections
$proxy->log( HTTP::Proxy::PROCESS, "PROCESS",
"No fork allowed, serving the connection" );
$proxy->serve_connections($fh->accept);
$proxy->new_connection;
next;
}
if ( @$kids >= $self->max_clients ) {
$proxy->log( HTTP::Proxy::ERROR, "PROCESS",
"Too many child process, serving the connection" );
$proxy->serve_connections($fh->accept);
$proxy->new_connection;
next;
}
# accept the new connection
my $conn = $fh->accept;
my $child = fork;
if ( !defined $child ) {
$conn->close;
$proxy->log( HTTP::Proxy::ERROR, "PROCESS", "Cannot fork" );
$self->max_clients( $self->max_clients - 1 )
if $self->max_clients > @$kids;
next;
}
# the parent process
if ($child) {
$conn->close;
$proxy->log( HTTP::Proxy::PROCESS, "PROCESS", "Forked child process $child" );
push @$kids, $child;
}
# the child process handles the whole connection
else {
$SIG{INT} = 'DEFAULT';
$proxy->serve_connections($conn);
exit; # let's die!
}
}
$self->reap_zombies if @$kids;
}
sub stop {
my $self = shift;
my $kids = $self->kids;
# wait for remaining children
# EOLOOP
kill INT => @$kids;
$self->reap_zombies while @$kids;
}
# private reaper sub
sub reap_zombies {
my $self = shift;
my $kids = $self->kids;
my $proxy = $self->proxy;
while (1) {
my $pid = waitpid( -1, WNOHANG );
last if $pid == 0 || $pid == -1; # AS/Win32 returns negative PIDs
@$kids = grep { $_ != $pid } @$kids;
$proxy->{conn}++; # Cannot use the interface for RO attributes
$proxy->log( HTTP::Proxy::PROCESS, "PROCESS", "Reaped child process $pid" );
$proxy->log( HTTP::Proxy::PROCESS, "PROCESS", @$kids . " remaining kids: @$kids" );
}
}
1;
__END__
=head1 NAME
HTTP::Proxy::Engine::Legacy - The "older" HTTP::Proxy engine
=head1 SYNOPSIS
my $proxy = HTTP::Proxy->new( engine => 'Legacy' );
=head1 DESCRIPTION
This engine reproduces the older child creation algorithm of L<HTTP::Proxy>.
Angelos Karageorgiou C<< <angelos@unix.gr> >> reports:
I<I got the Legacy engine to work really fast under C<Win32> with the following trick:>
max_keep_alive_requests(1);
max_clients(120);
$HTTP::VERSION(1.0); # just in case
I<and it smokes.>
I<It seems that forked children are really slow when calling select for handling C<keep-alive>d requests!>
=head1 METHODS
The module defines the following methods, used by L<HTTP::Proxy> main loop:
=over 4
=item start()
Initialise the engine.
=item run()
Implements the forking logic: a new process is forked for each new
incoming TCP connection.
=item stop()
Reap remaining child processes.
=back
The following method is used by the engine internally:
=over 4
=item reap_zombies()
Process the dead child processes.
=back
=head1 SEE ALSO
L<HTTP::Proxy>, L<HTTP::Proxy::Engine>.
=head1 AUTHOR
Philippe "BooK" Bruhat, C<< <book@cpan.org> >>.
=head1 COPYRIGHT
Copyright 2005-2013, Philippe Bruhat.
=head1 LICENSE
This module is free software; you can redistribute it or modify it under
the same terms as Perl itself.
=cut
|
