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|
#!/usr/bin/perl
no strict;
use POSIX ":sys_wait_h";
use Irssi qw/
signal_add_first
signal_continue
signal_register
command_bind
timeout_add_once
get_irssi_dir
/;
our $VERSION = "0.1";
our %IRSSI = (
authors => 'Urchlay',
contact => 'Urchlay on Libera',
name => 'yttitle',
description => 'get titles for youtube videos using yt-dlp',
license => 'WTFPL',
url => 'none',
);
# video ID => title
our %cache;
our $tmpdir = get_irssi_dir . "/yttitle.tmp";
# pid => [server, target, video ID]
our %jobs;
# video ID keys (values meaningless; only care about key presence)
our %job_videos;
# attempts to spawn more jobs than this are just ignored.
our $maxjobs = 10;
# milliseconds: how often to check %jobs to see if any jobs are done.
our $queue_time = 1000;
# command to execute, 1st %s replaced with video ID, 2nd with tmp filename.
# --socket-timeout arg is seconds, should be longer that $timeout.
our $command_fmt =
"yt-dlp -q --print '%%(title)s' --socket-timeout 10 -- %s >%s 2>/dev/null";
our $DEBUG = 1;
sub debug {
Irssi::print(join "", @_) if $DEBUG;
}
sub debugf {
Irssi::print(sprintf(@_)) if $DEBUG;
}
sub start_timer {
timeout_add_once($queue_time, "check_jobs", undef);
}
sub get_tmp_filename {
my $id = shift;
return $tmpdir . "/" . $id;
}
sub read_tmp_file {
my $file = shift;
open my $fh, "<:encoding(UTF-8)", $file;
if(!$fh) {
debug("read_tmp_file() failed to open $file: $!");
return;
}
my $result = <$fh>;
close $fh;
chomp $result if defined $result;
return length($result) ? $result : undef;
}
sub spawn_job {
my ($server, $target, $video_id) = @_;
my $jobcount = keys %jobs;
debug("spawn_job() called, video_id $video_id");
if($jobcount > $maxjobs) {
debug("spawn_job(): jobcount $jobcount > maxjobs $maxjobs, ignoring request");
return;
}
if($job_videos{$video_id}) {
debug("spawn_job(): video_id $video_id already in queue");
return;
}
my $cmd = sprintf($command_fmt, $video_id, get_tmp_filename($video_id));
debug("spawn_job() command is: $cmd");
my $pid = fork();
if($pid) {
# parent
debug("spawn_job() forked, kid pid is $pid");
start_timer unless keys %jobs;
$jobs{$pid} = [ $server, $target, $video_id ];
$job_videos{$video_id} = 1;
debug("spawn_job(): job pids: " . join(",", keys %jobs));
} else {
# child, debug() and Irssi::print don't work, here.
exec $cmd;
}
}
sub job_done {
my $pid = shift;
my ($server, $target, $video_id) = @{$jobs{$pid}};
debug("job_done() pid $pid, target $target, video_id $video_id");
my $file = get_tmp_filename($video_id);
my $title = read_tmp_file($file);
unlink $file;
$cache{$video_id} = $title;
delete $job_videos{$video_id};
if(!defined($title)) {
debug("job_done(): video_id $video_id failed to get title");
return;
}
say_title($server, $target, $video_id, $title);
}
sub check_jobs {
my @k = keys %jobs;
debug("check_jobs(): " . @k . " jobs");
return unless @k;
for my $jobpid (@k) {
debug("check_jobs(): about to waitpid($jobpid, WNOHANG)");
$pid = waitpid($jobpid, WNOHANG);
debug("check_jobs(): jobpid $jobpid, pid $pid");
next if $pid == 0; # still running, let it run
job_done($jobpid) if $pid > 0; # -1 is "no such pid"
delete $jobs{$jobpid};
}
start_timer if keys %jobs;
}
sub say_title {
my ($server, $target, $video_id, $title) = @_;
my $tag = "YouTube" . ($DEBUG ? "($video_id)" : "");
$server->command("msg $target $tag: $title");
}
sub on_public_msg {
my ($server, $msg, $nick, $address, $target) = @_;
my $mynick = $server->{nick};
unless(length $target) {
$target = $nick;
$nick = $mynick;
}
if($target eq $mynick) {
# private message... send response to sender
$target = $nick;
}
for my $video_id ($msg =~ /(?:youtube\.com\S+(?:embed\/|v=)|youtu.be\/)([-0-9a-zA-Z_]{11})/g) {
if($cache{$video_id}) {
debug("video_id $video_id found in cache");
say_title($server, $target, $video_id, $cache{$video_id});
} else {
debug("video_id $video_id NOT found in cache, queuing job");
spawn_job($server, $target, $video_id);
}
}
}
### main()
mkdir $tmpdir;
signal_add_first("message public", "on_public_msg");
|
