watch: remove Filesys::Notify::Simple dependency

[public-inbox.git] / lib / PublicInbox / DirIdle.pm

diff --git a/lib/PublicInbox/DirIdle.pm b/lib/PublicInbox/DirIdle.pm
new file mode 100644 (file)
index 0000000..ffceda6
--- /dev/null
+++ b/lib/PublicInbox/DirIdle.pm
@@ -0,0 +1,50 @@
+# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# Used by public-inbox-watch for Maildir (and possibly MH in the future)
+package PublicInbox::DirIdle;
+use strict;
+use base 'PublicInbox::DS';
+use fields qw(inot);
+use PublicInbox::Syscall qw(EPOLLIN EPOLLET);
+use PublicInbox::In2Tie;
+
+my ($MAIL_IN, $ino_cls);
+if ($^O eq 'linux' && eval { require Linux::Inotify2; 1 }) {
+       $MAIL_IN = Linux::Inotify2::IN_MOVED_TO() |
+               Linux::Inotify2::IN_CREATE();
+       $ino_cls = 'Linux::Inotify2';
+} elsif (eval { require PublicInbox::KQNotify }) {
+       $MAIL_IN = PublicInbox::KQNotify::MOVED_TO_OR_CREATE();
+       $ino_cls = 'PublicInbox::KQNotify';
+} else {
+       require PublicInbox::FakeInotify;
+       $MAIL_IN = PublicInbox::FakeInotify::MOVED_TO_OR_CREATE();
+}
+
+sub new {
+       my ($class, $dirs, $cb) = @_;
+       my $self = fields::new($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; # starts timer
+       }
+
+       # Linux::Inotify2->watch or similar
+       $inot->watch($_, $MAIL_IN, $cb) for @$dirs;
+       $self->{inot} = $inot;
+       $self;
+}
+
+sub event_step {
+       my ($self) = @_;
+       eval { $self->{inot}->poll }; # Linux::Inotify2::poll
+       warn "$self->{inot}->poll err: $@\n" if $@;
+}
+
+1;