Add current limits to the error message

app/controllers/epp/base_controller.rb

@@ -32,7 +32,7 @@ module Epp
     def respond_with_session_limit_exceeded_error(exception)
       epp_errors.add(:epp_errors,
                      code: '2502',
-                     message: 'Session limit exceeded, try again later')
+                     msg: Shunter.default_error_message)
       handle_errors
       log_exception(exception)
     end

app/lib/shunter.rb

@@ -9,6 +9,10 @@ module Shunter
 
   BASE_CONNECTION = ENV['shunter_redis_connection'] || { host: 'redis', port: 6379 }
 
+  def default_error_message
+    "Session limit exceeded. Current limit is #{default_threshold} in #{default_timespan} seconds"
+  end
+
   def default_timespan
     ENV['shunter_default_timespan'] || ONE_MINUTE
   end

app/models/epp/domain.rb

@@ -105,6 +105,9 @@ class Epp::Domain < Domain
            max: Setting.ns_max_count
          }
         ],
+        '2502' => [ # Rate limit exceeded
+          %i[base session_limit_exceeded],
+        ],
       ]
     }
   end

app/models/epp/response/result/code.rb

@@ -62,7 +62,7 @@ module Epp
           2308 => 'Data management policy violation',
           2400 => 'Command failed',
           2501 => 'Authentication error; server closing connection',
-          2502 => 'Session limit exceeded; server closing connection',
+          2502 => Shunter.default_error_message,
         }.freeze
         private_constant :DEFAULT_DESCRIPTIONS
 

test/integration/epp/domain/info/base_test.rb

@@ -236,6 +236,7 @@ class EppDomainInfoBaseTest < EppTestCase
     response_xml = Nokogiri::XML(response.body)
     assert_epp_response :session_limit_exceeded_server_closing_connection
     assert_correct_against_schema response_xml
+    assert response.body.include?(Shunter.default_error_message)
     ENV["shunter_default_threshold"] = '10000'
     ENV["shunter_enabled"] = 'false'
   end

test/models/epp/response/result/code_test.rb

@@ -85,7 +85,7 @@ class EppResponseResultCodeTest < ActiveSupport::TestCase
       2308 => 'Data management policy violation',
       2400 => 'Command failed',
       2501 => 'Authentication error; server closing connection',
-      2502 => 'Session limit exceeded; server closing connection'
+      2502 => Shunter.default_error_message
     }
     assert_equal descriptions, Epp::Response::Result::Code.default_descriptions
   end