1 files changed, 58 insertions, 0 deletions
diff --git a/lib/gitlab/graphql/tracers/logger_tracer.rb b/lib/gitlab/graphql/tracers/logger_tracer.rb
new file mode 100644
index 00000000000..c7ba56824db
--- /dev/null
+++ b/lib/gitlab/graphql/tracers/logger_tracer.rb
@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    module Tracers
+      # This tracer writes logs for certain trace events.
+      # It reads duration metadata written by TimerTracer.
+      class LoggerTracer
+        def self.use(schema)
+          schema.tracer(self.new)
+        end
+
+        def trace(key, data)
+          result = yield
+
+          case key
+          when "execute_query"
+            log_execute_query(**data)
+          end
+
+          result
+        end
+
+        private
+
+        def log_execute_query(query: nil, duration_s: 0)
+          # execute_query should always have :query, but we're just being defensive
+          return unless query
+
+          analysis_info = query.context[:gl_analysis]&.transform_keys { |key| "query_analysis.#{key}" }
+          info = {
+            trace_type: 'execute_query',
+            query_fingerprint: query.fingerprint,
+            duration_s: duration_s,
+            operation_name: query.operation_name,
+            operation_fingerprint: query.operation_fingerprint,
+            is_mutation: query.mutation?,
+            variables: clean_variables(query.provided_variables),
+            query_string: query.query_string
+          }
+
+          info.merge!(::Gitlab::ApplicationContext.current)
+          info.merge!(analysis_info) if analysis_info
+
+          ::Gitlab::GraphqlLogger.info(info)
+        end
+
+        def clean_variables(variables)
+          filtered = ActiveSupport::ParameterFilter
+            .new(::Rails.application.config.filter_parameters)
+            .filter(variables)
+
+          filtered&.to_s
+        end
+      end
+    end
+  end
+end