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|
#!/usr/bin/perl
use strict;
use warnings;
use utf8;
use Time::Piece;
use Sys::Syslog qw(:standard :macros);
use OpenBSD::Pledge;
use OpenBSD::Unveil;
my $dict_dir = '/var/www/var/lex/dict';
my $state_file = '/var/www/var/lex/mailer.tsv';
my $to = 'me@example.com';
my $from = 'lex@example.com';
my $from_header = "Lex <$from>";
my $subject = 'Daily word';
my $sendmail = '/usr/sbin/sendmail';
my $syslog_tag = 'lex-mail';
my $max_interval = 365; # Upper bound limit (1 year)
# Connect to /dev/log before pledge/unveil so no late 'unix'
# socket creation occurs
openlog($syslog_tag, 'ndelay,pid', LOG_MAIL);
unveil($dict_dir, 'r') or log_die("unveil $dict_dir: $!");
unveil($state_file, 'rwc') or log_die("unveil $state_file: $!");
unveil($sendmail, 'rx') or log_die("unveil $sendmail: $!");
unveil('/etc/mailer.conf', 'r') or log_die("unveil /etc/mailer.conf: $!");
unveil('/var/run/smtpd.sock', 'rw') or log_die("unveil smtpd.sock: $!");
unveil('/dev/log', 'w') or log_die("unveil /dev/log: $!"); # Writing to pre-opened socket handle
unveil(); # Lock unveil rules
pledge(qw(stdio rpath wpath cpath proc exec)) or log_die("pledge: $!");
sub log_die {
my ($msg) = @_;
syslog(LOG_ERR, "%s", $msg);
closelog();
die $msg;
}
# Read dictionary files
my $dh;
if (!opendir($dh, $dict_dir)) {
log_die("Cannot open $dict_dir: $!");
}
my @current_files = grep { -f "$dict_dir/$_" && !/^\./ } readdir($dh);
closedir($dh);
if (!@current_files) {
syslog(LOG_WARNING, "No files found in %s", $dict_dir);
# Truncate state file if it exists
if (-f $state_file) {
if (open(my $clear_fh, '>', $state_file)) {
close($clear_fh);
} else {
syslog(LOG_ERR, "Failed to clear %s: %s", $state_file, $!);
}
}
closelog();
exit 0;
}
my %active_files = map { $_ => 1 } @current_files;
my %state;
my $today = localtime->ymd;
if (-f $state_file) {
my $sfh;
if (!open($sfh, '<', $state_file)) {
log_die("Cannot open $state_file: $!");
}
while (my $line = <$sfh>) {
chomp $line;
next if $line =~ /^\s*$/;
my ($file, $next_due, $interval, $reviews, $factor) = split(/\t/, $line);
if ($file && $active_files{$file}) {
$state{$file} = {
next_due => $next_due // $today,
interval => $interval // 1,
reviews => $reviews // 0,
factor => $factor // 2.5,
};
}
}
close($sfh);
}
# Initialize new files not yet in tsv
foreach my $file (@current_files) {
if (!$state{$file}) {
$state{$file} = {
next_due => $today,
interval => 1,
reviews => 0,
factor => 2.5,
};
}
}
# Select candidate file (spaced repetition + fair scheduling)
my @due_files = grep { $state{$_}{next_due} le $today } @current_files;
my $selected_file;
if (@due_files == 1) {
$selected_file = $due_files[0];
} elsif (@due_files > 1) {
# Weighted random choice: files with fewer reviews get higher probability weights
my %weights;
my $total_weight = 0;
foreach my $file (@due_files) {
# Inversely proportional weight (1 / (reviews + 1))
my $w = 1.0 / ($state{$file}{reviews} + 1);
$weights{$file} = $w;
$total_weight += $w;
}
my $rand_point = rand($total_weight);
my $accum = 0;
foreach my $file (@due_files) {
$accum += $weights{$file};
if ($rand_point <= $accum) {
$selected_file = $file;
last;
}
}
$selected_file //= $due_files[-1]; # Fallback
} else {
@current_files = sort { $state{$a}{next_due} cmp $state{$b}{next_due} } @current_files;
$selected_file = $current_files[0];
syslog(LOG_INFO, "No files due today; falling back to nearest due file: %s", $selected_file);
}
# Read content
my $file_path = "$dict_dir/$selected_file";
my $fh;
if (!open($fh, '<:utf8', $file_path)) {
log_die("Cannot open $file_path: $!");
}
local $/; # slurp mode
my $body = <$fh>;
close($fh);
# Send email via direct pipe
my $mail_pipe;
if (!open($mail_pipe, '|-', $sendmail, '-i', '-f', $from, $to)) {
log_die("Cannot execute $sendmail: $!");
}
binmode($mail_pipe, ':utf8');
print $mail_pipe "From: $from_header\n";
print $mail_pipe "To: $to\n";
print $mail_pipe "Subject: $subject - $selected_file\n";
print $mail_pipe "Content-Type: text/plain; charset=UTF-8\n\n";
print $mail_pipe $body;
if (!close($mail_pipe)) {
log_die("Error closing pipe to sendmail: $!");
}
# Update schedule
my $item = $state{$selected_file};
my $interval = $item->{interval};
my $factor = $item->{factor};
if ($item->{reviews} == 0) {
$interval = 1;
} elsif ($item->{reviews} == 1) {
$interval = 6;
} else {
$interval = int($interval * $factor);
}
# Cap interval
if ($interval > $max_interval) {
$interval = $max_interval;
}
$item->{interval} = $interval;
$item->{reviews} += 1;
my $now = localtime;
$item->{next_due} = ($now + ($interval * 86400))->ymd;
# Toss deleted files from the tsv.
foreach my $file (keys %state) {
delete $state{$file} unless $active_files{$file};
}
# Atomic write using a temporary state file
my $tmp_file = "$state_file.tmp";
my $out_fh;
if (!open($out_fh, '>', $tmp_file)) {
log_die("Cannot write to $tmp_file: $!");
}
foreach my $file (keys %state) {
my $i = $state{$file};
print $out_fh join("\t", $file, $i->{next_due}, $i->{interval}, $i->{reviews}, $i->{factor}), "\n";
}
close($out_fh) or log_die("Error closing $tmp_file: $!");
if (!rename($tmp_file, $state_file)) {
log_die("Cannot atomic swap $tmp_file to $state_file: $!");
}
syslog(LOG_INFO, "Mailed %s to %s (next due: %s)", $selected_file, $to, $item->{next_due});
closelog();
|
