Implement Sequel integration configuration

lib/ddtrace/contrib/sequel/configuration/settings.rb

@@ -0,0 +1,13 @@
+require 'ddtrace/contrib/configuration/settings'
+
+module Datadog
+  module Contrib
+    module Sequel
+      module Configuration
+        class Settings < Contrib::Configuration::Settings
+          # Add any custom Sequel settings or behavior here.
+        end
+      end
+    end
+  end
+end

lib/ddtrace/contrib/sequel/database.rb

@@ -31,7 +31,7 @@ def run(sql, options = ::Sequel::OPTS)
           def datadog_pin
             @pin ||= Datadog::Pin.new(
               Datadog.configuration[:sequel][:service_name] || adapter_name,
-              app: Patcher::APP,
+              app: Integration::APP,
               app_type: Datadog::Ext::AppTypes::DB,
               tracer: Datadog.configuration[:sequel][:tracer] || Datadog.tracer
             )

lib/ddtrace/contrib/sequel/integration.rb

@@ -0,0 +1,30 @@
+require 'ddtrace/contrib/integration'
+require 'ddtrace/contrib/sequel/configuration/settings'
+require 'ddtrace/contrib/sequel/patcher'
+
+module Datadog
+  module Contrib
+    module Sequel
+      # Description of Sequel integration
+      class Integration
+        include Contrib::Integration
+
+        APP = 'sequel'.freeze
+
+        register_as :sequel, auto_patch: false
+
+        def self.compatible?
+          RUBY_VERSION >= '2.0.0' && defined?(::Sequel)
+        end
+
+        def default_configuration
+          Configuration::Settings.new
+        end
+
+        def patcher
+          Patcher
+        end
+      end
+    end
+  end
+end

lib/ddtrace/contrib/sequel/patcher.rb

@@ -1,3 +1,4 @@
+require 'ddtrace/contrib/patcher'
 require 'ddtrace/contrib/sequel/database'
 require 'ddtrace/contrib/sequel/dataset'
 
@@ -7,40 +8,23 @@ module Sequel
       # Patcher enables patching of 'sequel' module.
       # This is used in monkey.rb to manually apply patches
       module Patcher
-        include Base
-
-        APP = 'sequel'.freeze
-
-        register_as :sequel, auto_patch: false
-        option :service_name
-        option :tracer, default: Datadog.tracer
-
-        @patched = false
+        include Contrib::Patcher
 
         module_function
 
-        # patched? tells whether patch has been successfully applied
         def patched?
-          @patched
+          done?(:sequel)
         end
 
         def patch
-          if !@patched && compatible?
+          do_once(:sequel) do
             begin
               patch_sequel_database
               patch_sequel_dataset
-
-              @patched = true
             rescue StandardError => e
               Datadog::Tracer.log.error("Unable to apply Sequel integration: #{e}")
             end
           end
-
-          @patched
-        end
-
-        def compatible?
-          RUBY_VERSION >= '2.0.0' && defined?(::Sequel)
         end
 
         def patch_sequel_database

spec/ddtrace/contrib/sequel/configuration_spec.rb

@@ -11,7 +11,7 @@
   let(:span) { spans.first }
 
   before(:each) do
-    skip unless Datadog::Contrib::Sequel::Patcher.compatible?
+    skip unless Datadog::Contrib::Sequel::Integration.compatible?
   end
 
   describe 'for a SQLite database' do

spec/ddtrace/contrib/sequel/instrumentation_spec.rb

@@ -3,7 +3,7 @@
 require 'time'
 require 'sequel'
 require 'ddtrace'
-require 'ddtrace/contrib/sequel/patcher'
+require 'ddtrace/contrib/sequel/integration'
 
 RSpec.describe 'Sequel instrumentation' do
   let(:tracer) { Datadog::Tracer.new(writer: FauxWriter.new) }
@@ -17,7 +17,7 @@
   let(:spans) { tracer.writer.spans }
 
   before(:each) do
-    skip unless Datadog::Contrib::Sequel::Patcher.compatible?
+    skip('Sequel not compatible.') unless Datadog::Contrib::Sequel::Integration.compatible?
 
     # Reset options (that might linger from other tests)
     Datadog.configuration[:sequel].reset_options!