Optimize log subscribers to check if the log level is sufficient before performing an operations.

1 files changed, 4 insertions, 2 deletions

diff --git a/actionmailer/lib/action_mailer/log_subscriber.rb b/actionmailer/lib/action_mailer/log_subscriber.rb
index a6c163832e..fe1bca969c 100644
--- a/actionmailer/lib/action_mailer/log_subscriber.rb
+++ b/actionmailer/lib/action_mailer/log_subscriber.rb
@@ -1,13 +1,15 @@
 module ActionMailer
   class LogSubscriber < ActiveSupport::LogSubscriber
     def deliver(event)
+      return unless logger.debug?
       recipients = Array(event.payload[:to]).join(', ')
-      info("\nSent mail to #{recipients} (%1.fms)" % event.duration)
+      info("\nSent mail to #{recipients} (#{event.duration.round(1)}ms)")
       debug(event.payload[:mail])
     end
 
     def receive(event)
-      info("\nReceived mail (%.1fms)" % event.duration)
+      return unless logger.debug?
+      info("\nReceived mail (#{event.duration.round(1)}ms)")
       debug(event.payload[:mail])
     end