LP#1824181: Allow 1st arg to logger to be string or subroutine

This simple change allows the $msg passed to _log_message in Logger.pm
to be either a regular string or a delayed exec subroutine. This is in
reaction to LP1823338 where a slow debug logging statement was slowing
down SIP checkins even though debug logging was not turned on.

With this change you can take this:

$log->debug("Available methods\n\t".join("\n\t", keys %{ $_METHODS[$proto] }), INTERNAL);

and change it to this:

$log->debug(sub{return "Available methods\n\t".join("\n\t", keys %{ $_METHODS[$proto] }) }, INTERNAL);

and then that slow debug logging line will not be executed unless
debug logging is turned on.

Signed-off-by: John Merriam <jmerriam@biblio.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>

diff --git a/src/perl/lib/OpenSRF/Utils/Logger.pm b/src/perl/lib/OpenSRF/Utils/Logger.pm
index 157c961..6a662ac 100644 (file)
--- a/src/perl/lib/OpenSRF/Utils/Logger.pm
+++ b/src/perl/lib/OpenSRF/Utils/Logger.pm
@@ -239,6 +239,9 @@ sub _log_message {
     my( $msg, $level ) = @_;
     return if $level > $loglevel;
 
+    # Allow $msg to be either a normal string or a delayed exec subroutine
+    $msg = &$msg if (ref($msg) eq 'CODE');
+
     # apply a sane default service name/tag
     $logger->set_service($0) unless $service;