force encode user agent to utf-8 and show encoding in rollbar error (#1212)

Author: andrewmcodes

app/controllers/impressions_controller.rb

@@ -40,10 +40,10 @@ def create_impression
       @virtual_impression[:ad_template],
       @virtual_impression[:ad_theme],
       request.remote_ip,
-      request.user_agent,
+      request.user_agent.force_encoding(Encoding::UTF_8),
       Time.current.iso8601
     )
   rescue Encoding::UndefinedConversionError => e
-    Rollbar.error "#{e} => #{@virtual_impression_id}, #{@virtual_impression[:campaign_id]}, #{@virtual_impression[:property_id]}, #{@virtual_impression[:creative_id]}, #{@virtual_impression[:ad_template]}, #{@virtual_impression[:ad_theme]}, #{request.remote_ip}, #{request.user_agent}, #{Time.current.iso8601}"
+    Rollbar.error "#{e} => #{@virtual_impression_id.encoding}, #{@virtual_impression[:campaign_id].encoding}, #{@virtual_impression[:property_id].encoding}, #{@virtual_impression[:creative_id].encoding}, #{@virtual_impression[:ad_template].encoding}, #{@virtual_impression[:ad_theme].encoding}, #{request.remote_ip.encoding}, #{request.user_agent.encoding}, #{Time.current.iso8601}"
   end
 end