Add relevant logging contexts only for the duration of the request

This should prevent some contexts such us UserContext to be present on subsequent logs for requests without users

Author: adikus

lib/logtail-rack/http_context.rb

@@ -18,8 +18,9 @@ def call(env)
             request_id: request.request_id
           )
 
-          CurrentContext.add(context.to_hash)
-          @app.call(env)
+          CurrentContext.with(context.to_hash) do
+            @app.call(env)
+          end
         end
       end
     end

lib/logtail-rack/user_context.rb

@@ -67,10 +67,12 @@ def custom_user_hash
         def call(env)
           user_hash = get_user_hash(env)
           if user_hash
-            CurrentContext.add({user: user_hash})
+            CurrentContext.with({user: user_hash}) do
+              @app.call(env)
+            end
+          else
+            @app.call(env)
           end
-
-          @app.call(env)
         end
 
         private