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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;
my $IN_CLOSE = 0x08 | 0x10; # match Linux inotify
# my $IN_MOVED_TO = 0x80;
# my $IN_CREATE = 0x100;
sub MOVED_TO_OR_CREATE () { 0x80 | 0x100 }
my $poll_intvl = 2; # same as Filesys::Notify::Simple
sub poll_once {
my ($self) = @_;
sub {
eval { $self->poll };
warn "E: FakeInotify->poll: $@\n" if $@;
PublicInbox::DS::add_timer($poll_intvl, poll_once($self));
};
}
sub new {
my $self = bless { watch => {} }, __PACKAGE__;
PublicInbox::DS::add_timer($poll_intvl, poll_once($self));
$self;
}
# behaves like Linux::Inotify2->watch
sub watch {
my ($self, $path, $mask, $cb) = @_;
my @st = stat($path) or return;
my $k = "$path\0$mask";
$self->{watch}->{$k} = [ $st[10], $cb ]; # 10 - ctime
bless [ $self->{watch}, $k ], 'PublicInbox::FakeInotify::Watch';
}
sub on_new_files ($$$$) {
my ($dh, $cb, $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) {
bless \$full, 'PublicInbox::FakeInotify::Event';
eval { $cb->(\$full) };
}
}
}
# behaves like non-blocking Linux::Inotify2->poll
sub poll {
my ($self) = @_;
my $watch = $self->{watch} or return;
for my $x (keys %$watch) {
my ($path, $mask) = split(/\0/, $x, 2);
my @now = stat($path) or next;
my $prv = $watch->{$x};
my $cb = $prv->[-1];
my $old_ctime = $prv->[0];
if ($old_ctime != $now[10]) {
if (($mask & $IN_CLOSE) == $IN_CLOSE) {
eval { $cb->() };
} elsif ($mask & MOVED_TO_OR_CREATE) {
opendir(my $dh, $path) or do {
warn "W: opendir $path: $!\n";
next;
};
on_new_files($dh, $cb, $path, $old_ctime);
}
}
@$prv = ($now[10], $cb);
}
}
package PublicInbox::FakeInotify::Watch;
use strict;
sub cancel {
my ($self) = @_;
delete $self->[0]->{$self->[1]};
}
package PublicInbox::FakeInotify::Event;
use strict;
sub fullname { ${$_[0]} }
1;
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