# Copyright (C) 2020 all contributors
# License: AGPL-3.0+
# for systems lacking Linux::Inotify2 or IO::KQueue, just emulates
# enough of Linux::Inotify2
package PublicInbox::FakeInotify;
use strict;
use Time::HiRes qw(stat);
my $IN_CLOSE = 0x08 | 0x10; # match Linux inotify
my $poll_intvl = 2; # same as Filesys::Notify::Simple
my $for_cancel = bless \(my $x), 'PublicInbox::FakeInotify::Watch';
sub poll_once {
my ($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;
$self->{watch}->{"$path\0$mask"} = [ @st, $cb ];
$for_cancel;
}
# behaves like non-blocking Linux::Inotify2->poll
sub poll {
my ($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 = $prv->[-1];
# 10: ctime, 7: size
if ($prv->[10] != $now[10]) {
if (($mask & $IN_CLOSE) == $IN_CLOSE) {
eval { $cb->() };
}
}
@$prv = (@now, $cb);
}
}
package PublicInbox::FakeInotify::Watch;
sub cancel {} # noop
1;