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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>
# for systems lacking Linux::Inotify2 or IO::KQueue, just emulates
# enough of Linux::Inotify2
package PublicInbox::FakeInotify;
use strict;
use Time::HiRes qw(stat);
use PublicInbox::DS;
sub IN_MODIFY () { 0x02 } # match Linux inotify
# my $IN_MOVED_TO = 0x80;
# my $IN_CREATE = 0x100;
sub MOVED_TO_OR_CREATE () { 0x80 | 0x100 }
my $poll_intvl = 2; # same as Filesys::Notify::Simple
sub new { bless { watch => {} }, __PACKAGE__ }
# behaves like Linux::Inotify2->watch
sub watch {
my ($self, $path, $mask) = @_;
my @st = stat($path) or return;
my $k = "$path\0$mask";
$self->{watch}->{$k} = $st[10]; # 10 - ctime
bless [ $self->{watch}, $k ], 'PublicInbox::FakeInotify::Watch';
}
sub on_new_files ($$$$) {
my ($events, $dh, $path, $old_ctime) = @_;
while (defined(my $base = readdir($dh))) {
next if $base =~ /\A\.\.?\z/;
my $full = "$path/$base";
my @st = stat($full);
if (@st && $st[10] > $old_ctime) {
push @$events,
bless(\$full, 'PublicInbox::FakeInotify::Event')
}
}
}
# behaves like non-blocking Linux::Inotify2->read
sub read {
my ($self) = @_;
my $watch = $self->{watch} or return ();
my $events = [];
for my $x (keys %$watch) {
my ($path, $mask) = split(/\0/, $x, 2);
my @now = stat($path) or next;
my $old_ctime = $watch->{$x};
$watch->{$x} = $now[10];
next if $old_ctime == $now[10];
if ($mask & IN_MODIFY) {
push @$events,
bless(\$path, 'PublicInbox::FakeInotify::Event')
} elsif ($mask & MOVED_TO_OR_CREATE) {
opendir(my $dh, $path) or do {
warn "W: opendir $path: $!\n";
next;
};
on_new_files($events, $dh, $path, $old_ctime);
}
}
@$events;
}
sub poll_once {
my ($obj) = @_;
$obj->event_step; # PublicInbox::InboxIdle::event_step
PublicInbox::DS::add_timer($poll_intvl, \&poll_once, $obj);
}
package PublicInbox::FakeInotify::Watch;
use strict;
sub cancel {
my ($self) = @_;
delete $self->[0]->{$self->[1]};
}
sub name {
my ($self) = @_;
(split(/\0/, $self->[1], 2))[0];
}
package PublicInbox::FakeInotify::Event;
use strict;
sub fullname { ${$_[0]} }
1;
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