Added X-Request-Id tracking and TaggedLogging to easily log that and other production concerns

1 files changed, 10 insertions, 0 deletions

diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index 37d0a3e0b8..7a5237dcf3 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -177,6 +177,16 @@ module ActionDispatch
       @remote_ip ||= (@env["action_dispatch.remote_ip"] || ip).to_s
     end
 
+    # Returns the unique request id, which is based off either the X-Request-Id header that can
+    # be generated by a firewall, load balancer, or web server or by the RequestId middleware
+    # (which sets the action_dispatch.request_id environment variable).
+    #
+    # This unique ID is useful for tracing a request from end-to-end as part of logging or debugging.
+    # This relies on the rack variable set by the ActionDispatch::RequestId middleware.
+    def uuid
+      @uuid ||= env["action_dispatch.request_id"]
+    end
+
     # Returns the lowercase name of the HTTP server software.
     def server_software
       (@env['SERVER_SOFTWARE'] && /^([a-zA-Z]+)/ =~ @env['SERVER_SOFTWARE']) ? $1.downcase : nil