feat: allow error causes to be configured to log at warning level

lib/pact_broker/api/resources/error_handler.rb

@@ -29,7 +29,7 @@ def self.reportable?(e)
         end
 
         def self.log_as_warning?(e)
-          PactBroker.configuration.warning_error_classes.any? { |clazz| e.is_a?(clazz) }
+          PactBroker.configuration.warning_error_classes.any? { |clazz| e.is_a?(clazz) || e.cause&.is_a?(clazz) }
         end
 
         def self.display_message(e, obfuscated_message)

lib/pact_broker/configuration.rb

@@ -127,7 +127,7 @@ def self.default_configuration
         require 'pact_broker/api/resources/default_base_resource'
         PactBroker::Api::Resources::DefaultBaseResource
       }
-      config.warning_error_class_names = ['Sequel::ForeignKeyConstraintViolation']
+      config.warning_error_class_names = ['Sequel::ForeignKeyConstraintViolation', 'PG::QueryCanceled']
       config.metrics_sql_statement_timeout = 30
       config
     end
@@ -250,8 +250,13 @@ def webhook_host_whitelist= webhook_host_whitelist
 
     def warning_error_classes
       warning_error_class_names.collect do | class_name |
-        Object.const_get(class_name)
-      end
+        begin
+          Object.const_get(class_name)
+        rescue NameError => e
+          logger.warn("Class #{class_name} couldn't be loaded as a warning error class (#{e.class} - #{e.message}). Ignoring.")
+          nil
+        end
+      end.compact
     end
 
     private

spec/lib/pact_broker/api/resources/error_handler_spec.rb

@@ -53,6 +53,22 @@ module Resources
             end
           end
 
+          context "when the error cause class is in the warning_error_classes list" do
+            class TestCauseError < StandardError; end
+
+            before do
+              allow(PactBroker.configuration).to receive(:warning_error_classes).and_return([TestCauseError])
+              allow(error).to receive(:cause).and_return(TestCauseError.new)
+            end
+
+            let(:error) { StandardError.new("message") }
+
+            it "logs at warn so as not to wake everyone up in the middle of the night" do
+              expect(logger).to receive(:warn).with(/bYWfnyWPlf/, error)
+              subject
+            end
+          end
+
           context "when the error is not reportable and not a warning level" do
             let(:error) { PactBroker::Error.new('foo') }