From aab36b81bd8ee4beadc2a6ea6cebec7c2c9fcf0a Mon Sep 17 00:00:00 2001
From: Florian Pritz <bluewind@xinu.at>
Date: Thu, 28 Dec 2017 11:09:49 +0100
Subject: mailer.pl: Use MCE::Flow

Slightly better performance and more control.

Signed-off-by: Florian Pritz <bluewind@xinu.at>
---
 mailer.pl | 86 ++++++++++++++++++++++++++++++++++-----------------------------
 1 file changed, 47 insertions(+), 39 deletions(-)
 mode change 100644 => 100755 mailer.pl

diff --git a/mailer.pl b/mailer.pl
old mode 100644
new mode 100755
index c3b53da..cab1509
--- a/mailer.pl
+++ b/mailer.pl
@@ -12,6 +12,8 @@ use Getopt::Long;
 use List::Util;
 use MCE;
 use MCE::Loop;
+use MCE::Flow;
+use MCE::Shared;
 use Path::Tiny;
 use Pod::Usage;
 use Time::HiRes qw(gettimeofday tv_interval);
@@ -35,6 +37,25 @@ my $chunksize = 1;
 # end config
 # ####
 
+=head1 NAME
+
+mailer.pl - send lots of mails
+
+=head1 SYNOPSIS
+
+mailer.pl options ...
+
+ Options:
+    --help, -h               short help message
+    --to <email or file>     recipient(s)
+    --from <email>           from
+    --subject <string>       subject
+    --content-html <file>    body of the mail (html part) (optional)
+    --content-txt <file>     body of the mail (text part)
+    --debug                  output extra debug information
+
+=cut
+
 my %opts = ();
 
 Getopt::Long::Configure ("bundling");
@@ -54,19 +75,6 @@ my $from = $opts{from};
 my $content_html;
 my $content_txt;
 
-my $mce_input;
-
-if ($opts{to} =~ m/.+\@.+\..+/) {
-	$mce_input = [$opts{to}];
-} else {
-	if (-r $opts{to}) {
-		open my $fh, "<", $opts{to};
-		$mce_input = $fh;
-	} else {
-		print STDERR "Error: can't read recipient file: $!\n";
-	}
-}
-
 die "Error: subject not set\n" unless ($opts{subject});
 die "Error: from not set\n" unless ($opts{from});
 die "Error: content-txt not set\n" unless ($opts{"content-txt"});
@@ -94,40 +102,40 @@ $msg->transport($transport);
 print "done\n" if $opts{debug};
 
 print "creating workers\n" if $opts{debug};
-MCE::Loop::init {max_workers => $thread_count, chunk_size => $chunksize};
 
 print "Sending\n";
 
 my $send_time = [gettimeofday];
-mce_loop {
-	my ($mce, $chunk_ref, $chunk_id) = @_;
-	for my $to (@{$chunk_ref}) {
+my $queue = MCE::Shared->queue(await => 1, fast => 1);
+
+mce_flow {
+	task_name => ['producer', 'sender'],
+	max_workers => [1, $thread_count]},
+sub {
+	if ($opts{to} =~ m/.+\@.+\..+/) {
+		$queue->enqueue($opts{to});
+	} else {
+		if (-r $opts{to}) {
+			open my $fh, "<", $opts{to};
+			while (<$fh>) {
+				$queue->enqueue($_);
+				$queue->await($thread_count);
+			}
+			close $fh;
+		} else {
+			print STDERR "Error: can't read recipient file: $!\n";
+		}
+	}
+	$queue->end();
+},
+sub {
+	while (defined (my $to = $queue->dequeue())) {
 		$msg->to($to);
 		$msg->send();
-		print "sent mail in worker ".MCE->wid." from chunk ".$chunk_id."\n" if $opts{debug};
+		print "sent mail in worker ".MCE->wid."\n" if $opts{debug};
 	}
 	$transport->disconnect;
-} $mce_input;
+};
 
 print "done after ".tv_interval($send_time)." seconds\n";
 
-__END__
-
-=head1 NAME
-
-mailer.pl - send lots of mails
-
-=head1 SYNOPSIS
-
-mailer.pl options ...
-
- Options:
-    --help, -h               short help message
-    --to <email or file>     recipient(s)
-    --from <email>           from
-    --subject <string>       subject
-    --content-html <file>    body of the mail (html part) (optional)
-    --content-txt <file>     body of the mail (text part)
-    --debug                  output extra debug information
-
-=cut
-- 
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