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| | # Copyright (C) 2020 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# fields:
# pi_config: PublicInbox::Config ref
# inot: Linux::Inotify2-like object
# pathmap => { inboxdir => [ ibx, watch1, watch2, watch3... ] } mapping
package PublicInbox::InboxIdle;
use strict;
use parent qw(PublicInbox::DS);
use Cwd qw(abs_path);
use PublicInbox::Syscall qw(EPOLLIN EPOLLET);
my $IN_MODIFY = 0x02; # match Linux inotify
my $ino_cls;
if ($^O eq 'linux' && eval { require Linux::Inotify2; 1 }) {
$IN_MODIFY = Linux::Inotify2::IN_MODIFY();
$ino_cls = 'Linux::Inotify2';
} elsif (eval { require PublicInbox::KQNotify }) {
$IN_MODIFY = PublicInbox::KQNotify::NOTE_WRITE();
$ino_cls = 'PublicInbox::KQNotify';
}
require PublicInbox::In2Tie if $ino_cls;
sub in2_arm ($$) { # PublicInbox::Config::each_inbox callback
my ($ibx, $self) = @_;
my $dir = abs_path($ibx->{inboxdir});
if (!defined($dir)) {
warn "W: $ibx->{inboxdir} not watched: $!\n";
return;
}
my $inot = $self->{inot};
my $cur = $self->{pathmap}->{$dir} //= [];
# transfer old subscriptions to the current inbox, cancel the old watch
if (my $old_ibx = $cur->[0]) {
$ibx->{unlock_subs} and
die "BUG: $dir->{unlock_subs} should not exist";
$ibx->{unlock_subs} = $old_ibx->{unlock_subs};
$cur->[1]->cancel; # Linux::Inotify2::Watch::cancel
}
$cur->[0] = $ibx;
my $lock = "$dir/".($ibx->version >= 2 ? 'inbox.lock' : 'ssoma.lock');
if (my $w = $cur->[1] = $inot->watch($lock, $IN_MODIFY)) {
$self->{on_unlock}->{$w->name} = $ibx;
} else {
warn "E: ".ref($inot)."->watch($lock, IN_MODIFY) failed: $!\n";
}
# TODO: detect deleted packs (and possibly other files)
}
sub refresh {
my ($self, $pi_config) = @_;
$pi_config->each_inbox(\&in2_arm, $self);
}
sub new {
my ($class, $pi_config) = @_;
my $self = bless {}, $class;
my $inot;
if ($ino_cls) {
$inot = $ino_cls->new or die "E: $ino_cls->new: $!";
my $io = PublicInbox::In2Tie::io($inot);
$self->SUPER::new($io, EPOLLIN | EPOLLET);
} else {
require PublicInbox::FakeInotify;
$inot = PublicInbox::FakeInotify->new;
}
$self->{inot} = $inot;
$self->{pathmap} = {}; # inboxdir => [ ibx, watch1, watch2, watch3...]
$self->{on_unlock} = {}; # lock path => ibx
refresh($self, $pi_config);
PublicInbox::FakeInotify::poll_once($self) if !$ino_cls;
$self;
}
sub event_step {
my ($self) = @_;
eval {
my @events = $self->{inot}->read; # Linux::Inotify2::read
my $on_unlock = $self->{on_unlock};
for my $ev (@events) {
if (my $ibx = $on_unlock->{$ev->fullname}) {
$ibx->on_unlock;
}
}
};
warn "{inot}->read err: $@\n" if $@;
}
# for graceful shutdown in PublicInbox::Daemon,
# just ensure the FD gets closed ASAP and subscribers
sub busy { 0 }
1;
|