From 9fe5682b3f7a7890ac07340864a5e27d73a8a839 Mon Sep 17 00:00:00 2001
From: Alexander Sulfrian <alex@spline.inf.fu-berlin.de>
Date: Fri, 6 May 2016 22:02:28 +0200
Subject: Spline::Log: Logging to syslog by default

Logging to stderr is still available.
---
 Spline/Log.pm | 51 +++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 45 insertions(+), 6 deletions(-)

diff --git a/Spline/Log.pm b/Spline/Log.pm
index f56d5f0..32080dc 100644
--- a/Spline/Log.pm
+++ b/Spline/Log.pm
@@ -9,6 +9,7 @@ Spline::Log - Utilities for logging
 
     use Spline::Log qw(...);
 
+    set_stderr($bool);
     set_verbose($bool);
     set_log_context($context);
     debug($message);
@@ -24,9 +25,12 @@ use strict;
 use warnings;
 use feature 'say';
 
+use Sys::Syslog;
+
 use base 'Exporter';
 our @EXPORT = qw();
 our @EXPORT_OK = qw(
+    set_stderr
     set_verbose
     set_log_context
     debug
@@ -35,6 +39,28 @@ our @EXPORT_OK = qw(
 
 my $context = undef;
 my $verbose = 0;
+my $syslog  = 0;
+
+=head2 set_stderr
+
+    set_stderr($bool);
+
+=cut
+
+sub set_stderr($) {
+    my $value = shift;
+
+    if ($value) {
+        if (defined $syslog && $syslog) {
+            closelog();
+        }
+
+        $syslog = undef;
+    }
+    else {
+        $syslog = 0 unless defined $syslog;
+    }
+}
 
 =head2 set_verbose
 
@@ -88,7 +114,7 @@ sub debug($) {
     my $msg = shift;
 
     if ($verbose) {
-        _log($msg);
+        _log('DEBUG', $msg);
     }
 }
 
@@ -103,7 +129,7 @@ prepended with the logging context (if defined).
 
 sub info($) {
     my $msg = shift;
-    _log($msg);
+    _log('INFO', $msg);
 }
 
 =head2 _get_context
@@ -123,18 +149,31 @@ sub _get_context() {
 
 =head2 _log
 
-    _log($msg);
+    _log($level, $msg);
 
 Log the supplied message. The message is prepended with the logging
 context (if defined). So the log format is something like this:
 
     CONTEXT: MESSAGE
 
+The supplied level is only used for syslog.
+
 =cut
 
-sub _log($) {
-    my $msg = shift;
-    say _get_context() . $msg;
+sub _log($$) {
+    my ($level, $msg) = @_;
+
+    my $output = _get_context() . $msg;
+    if (defined $syslog) {
+        unless ($syslog) {
+            openlog('dmarc_milter', 'ndelay,pid', 'mail');
+        }
+
+        syslog($level, $output);
+    }
+    else {
+        say STDERR $output;
+    }
 }
 
 =head1 AUTHOR
-- 
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