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#!/usr/bin/perl

eval 'exec /usr/bin/perl -w -S $0 ${1+"$@"}'
    if 0; # not running under some shell

#
# MogileFS storage node daemon
# (perlbal front-end)
#
# (c) 2004, Brad Fitzpatrick, <brad@danga.com>
# (c) 2006-2007, Six Apart, Ltd.

use strict;
use lib 'lib';
use Mogstored::HTTPServer;

use IO::Socket::INET;
use POSIX qw(WNOHANG);
use Perlbal 1.73;
use FindBin qw($Bin $RealScript);

use Mogstored::HTTPServer::Perlbal;
use Mogstored::HTTPServer::Lighttpd;
use Mogstored::HTTPServer::None;
use Mogstored::HTTPServer::Apache;
use Mogstored::SideChannelListener;
use Mogstored::SideChannelClient;

my $selfexe = "$Bin/$RealScript";

# State:
my %on_death; # pid -> subref (to run when pid dies)
my %devnum_to_device; # mogile device number (eg. 'dev1' would be '1') -> os device path (eg. '/dev/rd0')
my %osdevnum_to_device; # os device number (fetched via stat(file)[0]) -> os device path (ec. '/dev/rd0')
my %iostat_listeners; # fd => SideChannel client: clients interested in iostat data.
my $iostat_available = 1; # bool: iostat working. assume working to start.
my ($iostat_pipe_r, $iostat_pipe_w); # pipes for talking to iostat process

# Config:
my $opt_daemonize;
my $opt_config;
my $opt_iostat = 1; # default to on now
my $max_conns = 10000;
my $http_listen = "0.0.0.0:7500";
my $mgmt_listen = "0.0.0.0:7501";
my $docroot = "/var/mogdata";
my $default_config = "/etc/mogilefs/mogstored.conf";
my $server = $ENV{MOGSTORED_SERVER_TYPE} || "perlbal";
my $serverbin = "";
my $pidfile = undef;

# Rename binary in process list to make init scripts saner
$0 = "mogstored";

my %config_opts = (
                   'iostat' => \$opt_iostat,
                   'daemonize|d' => \$opt_daemonize,
                   'config=s' => \$opt_config,
                   'httplisten=s' => \$http_listen,
                   'mgmtlisten=s' => \$mgmt_listen,
                   'docroot=s' => \$docroot,
                   'maxconns=i' => \$max_conns,
                   'server=s' => \$server,
                   'serverbin=s' => \$serverbin,
                   'pidfile=s' => \$pidfile,
                   );
usage() unless Getopt::Long::GetOptions(%config_opts);

die "Unknown server type. Valid options: --server={perlbal,lighttpd,apache,none}"
    unless $server =~ /^perlbal|lighttpd|apache|none$/;

$opt_config = $default_config if ! $opt_config && -e $default_config;
load_config_file($opt_config => \%config_opts) if $opt_config;

# initialize basic required Perlbal machinery, for any HTTP server
my $perlbal_init = qq{
CREATE SERVICE mogstored
SET role = web_server
SET docroot = $docroot

# don't listen... this is just a stub service.
CREATE SERVICE mgmt
SET role = management
ENABLE mgmt
};
$perlbal_init .= "\nSERVER pidfile = $pidfile" if defined($pidfile);
Perlbal::run_manage_commands($perlbal_init , sub { print STDERR "$_[0]\n"; });

# start HTTP server
my $httpsrv_class = "Mogstored::HTTPServer::" . ucfirst($server);
my $httpsrv = $httpsrv_class->new(
                                        listen => $http_listen,
                                        docroot => $docroot,
                                        maxconns => $max_conns,
                                        bin => $serverbin,
                                        );
$httpsrv->start;

if ($opt_daemonize) {
    $httpsrv->pre_daemonize;
    Perlbal::daemonize();
} else {
    print "Running.\n";
}

$httpsrv->post_daemonize;

# kill our children processes on exit:
my $parent_pid = $$;

$SIG{TERM} = $SIG{INT} = sub {
    return unless $$ == $parent_pid; # don't let this be inherited
    kill 'TERM', grep { $_ } keys %on_death;
    POSIX::_exit(0);
};

setup_iostat_pipes();
start_disk_usage_process();
start_iostat_process() if $opt_iostat;
harvest_dead_children(); # every 2 seconds, it reschedules itself
setup_sidechannel_listener();

# now start the main loop
Perlbal::run();

############################################################################

sub usage {
    my $note = shift;
    $note = $note ? "NOTE: $note\n\n" : "";

    die "${note}Usage: mogstored [OPTS]

OPTS:
--daemonize -d Daemonize
--config=<file> Set config file (default is /etc/mogilefs/mogstored.conf)
--httplisten=<ip:port> IP/Port HTTP server listens on
--mgmtlisten=<ip:port> IP/Port management/sidechannel listens on
--docroot=<path> Docroot above device mount points. Defaults to /var/mogdata
--maxconns=<number> Number of simultaneous clients to serve. Default 10000
";

}

# accessor for SideChannelClient:
sub Mogstored::iostat_available {
    return $iostat_available;
}

sub load_config_file {
    my ($conffile, $opts) = @_;

    # parse the mogstored config file, which is just lines of comments and
    # "key = value" lines, where keys are just the same as command line
    # options.
    die "Config file $opt_config doesn't exist.\n" unless -e $conffile;
    open my $fh, $conffile or die "Couldn't open config file for reading: $!";
    while (<$fh>) {
        s/\#.*//;
        next unless /\S/;
        if (/SERVER max_connect/i || /CREATE SERVICE/i) {
            usage("Your $opt_config file is the old syntax. The new format is simply lines of <key> = <value> where keys are the same as mogstored's command line options.");

        }
        die "Unknown config syntax: $_\n" unless /^\s*(\w+)\s*=\s*(.+?)\s*$/;
        my ($key, $val) = ($1, $2);
        my $dest;
        foreach my $ck (keys %$opts) {
            next unless $ck =~ /^$key\b/;
            $dest = $opts->{$ck};
        }
        die "Unknown config setting: $key\n" unless $dest;
        $$dest = $val;
    }
}

sub harvest_dead_children {
    my $dead = waitpid(-1, WNOHANG);
    if ($dead > 0) {
        my $code = delete $on_death{$dead};
        $code->() if $code;
    }
    Danga::Socket->AddTimer(2, \&harvest_dead_children);
}

sub Mogstored::on_pid_death {
    my ($class, $pid, $code) = @_;
    $on_death{$pid} = $code;
}

# returns $pid of child, if parent, else runs child.
sub start_disk_usage_process {
    my $child = fork;
    unless (defined $child) {
        Perlbal::log('crit', "Fork error creating disk usage tracking process");
        return undef;
    }

    # if we're the parent.
    if ($child) {
        $on_death{$child} = sub {
            start_disk_usage_process(); # start a new one
        };
        return $child;
    }

    require Mogstored::ChildProcess::DiskUsage;
    my $class = "Mogstored::ChildProcess::DiskUsage";
    $class->pre_exec_init;
    $class->exec;
}

sub Mogstored::iostat_subscribe {
    my ($class, $sock) = @_;
    $iostat_listeners{fileno($sock->sock)} = $sock;
}

sub Mogstored::iostat_unsubscribe {
    my ($class, $sock) = @_;
    my $fdno = fileno($sock->sock);
    return unless defined $fdno;
    delete $iostat_listeners{$fdno};
}

# to be honest, I have no clue why this exists. I just had to move it
# around for multi-server refactoring, and I felt better not
# understanding it but preserving than killing it. in particular, why
# is this "graceful"? (gets called from SideChannelClient's
# die_gracefully)
sub Mogstored::on_sidechannel_die_gracefully {
    if ($$ == $parent_pid) {
        kill 'TERM', grep { $_ } keys %on_death;
    }
}

sub setup_sidechannel_listener {
    Mogstored::SideChannelListener->new($mgmt_listen);
}

my $iostat_read_buf = "";
sub setup_iostat_pipes {
    pipe ($iostat_pipe_r, $iostat_pipe_w);
    IO::Handle::blocking($iostat_pipe_r, 0);
    IO::Handle::blocking($iostat_pipe_w, 0);

    Danga::Socket->AddOtherFds(fileno($iostat_pipe_r), sub {
        read_from_iostat_child();
    });
}

sub start_iostat_process {
    my $pid = fork;
    unless (defined $pid) {
        warn "Fork for iostat failed: $!";
        return;
    }

    if ($pid) {
        # Parent
        $on_death{$pid} = sub {
            # Try a final read from data on the socket.
            # Note that this doesn't internally loop... so it might miss data.
            read_from_iostat_child();
            # Kill any buffer so partial reads don't hurt us later.
            drain_iostat_child_pipe();
            start_iostat_process();
        };
        return;
    }

    require Mogstored::ChildProcess::IOStat;
    my $class = "Mogstored::ChildProcess::IOStat";
    $class->pre_exec_init;
    $class->exec;
}

sub Mogstored::get_iostat_writer_pipe { $iostat_pipe_w }

sub drain_iostat_child_pipe {
    my $data;
    while (1) {
        last unless sysread($iostat_pipe_r, $data, 10240) > 0;
    }
    $iostat_read_buf = '';
}

# (runs in parent event-loop process)
sub read_from_iostat_child {
    my $data;
    my $rv = sysread($iostat_pipe_r, $data, 10240);
    return unless $rv && $rv > 0;

    $iostat_read_buf .= $data;

    # only write complete lines to sockets (in case for some reason we get
    # a partial read and child process dies...)
    while ($iostat_read_buf =~ s/(.+)\r?\n//) {
        my $line = $1;
        foreach my $out_sock (values %iostat_listeners) {
            # where $line will be like "dev53\t53.23" or a "." to signal end of a group of devices.
            # stop writing to the socket if the listener isn't picking it up.
            next if $out_sock->{write_buf_size};
            $out_sock->write("$line\n");
        }
    }
}

# Local Variables:
# mode: perl
# c-basic-indent: 4
# indent-tabs-mode: nil
# End:

__END__

=head1 NAME

mogstored -- MogileFS storage daemon

=head1 USAGE

This is the MogileFS storage daemon, which is just an HTTP server that
supports PUT, DELETE, etc. It's actually a wrapper around L<Perlbal>,
doing all the proper Perlbal config for you.

In addition, it monitors disk usage, I/O activity, etc, which are
checked from the L<MogileFS tracker|mogilefsd>.

=head1 AUTHORS

Brad Fitzpatrick E<lt>brad@danga.comE<gt>

Mark Smith E<lt>junior@danga.comE<gt>

Jonathan Steinert E<lt>jsteinert@sixapart.comE<gt>

=head1 ENVIRONMENT

=over 4

=item PERLBAL_XS_HEADERS

If defined and 0, Perlbal::XS::HTTPHeaders will not be used, if
present. Otherwise, it will be enabled by default, if installed and
loadable.

=back

=head1 COPYRIGHT

Copyright 2004, Danga Interactive
Copyright 2005-2006, Six Apart Ltd.

=head1 LICENSE

Same terms as Perl itself. Artistic/GPLv2, at your choosing.

=head1 SEE ALSO

L<MogileFS::Overview> -- high level overview of MogileFS

L<mogilefsd> -- MogileFS daemon

L<http://danga.com/mogilefs/>
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