Implement graphql's new tracing API

docs/GettingStarted.md

@@ -848,24 +848,26 @@ The `instrument :graphql` method accepts the following parameters. Additional op
 | Key | Description | Default |
 | --- | ----------- | ------- |
 | `schemas` | Array of `GraphQL::Schema` objects (that support class-based schema only) to trace. If you do not provide any, then tracing will applied to all the schemas. | `[]` |
+| `with_deprecated_tracer` | Enable to instrument with deprecated `GraphQL::Tracing::DataDogTracing`. Default is `false`, using `GraphQL::Tracing::DataDogTrace`  | `false` |
 | `service_name` | Service name used for graphql instrumentation | `'ruby-graphql'` |
 
 **Manually configuring GraphQL schemas**
 
-If you prefer to individually configure the tracer settings for a schema (e.g. you have multiple schemas with different service names), in the schema definition, you can add the following [using the GraphQL API](http://graphql-ruby.org/queries/tracing.html):
+If you prefer to individually configure the tracer settings for a schema (e.g. you have multiple schemas), in the schema definition, you can add the following [using the GraphQL API](http://graphql-ruby.org/queries/tracing.html):
+
+With `GraphQL::Tracing::DataDogTrace`
 
 ```ruby
-# Class-based schema
 class YourSchema < GraphQL::Schema
-  use(GraphQL::Tracing::DataDogTracing)
+  trace_with GraphQL::Tracing::DataDogTrace
 end
 ```
-
-Or you can modify an already defined schema:
+or with `GraphQL::Tracing::DataDogTracing` (deprecated)
 
 ```ruby
-# Class-based schema
-YourSchema.use(GraphQL::Tracing::DataDogTracing)
+class YourSchema < GraphQL::Schema
+  use(GraphQL::Tracing::DataDogTracing)
+end
 ```
 
 **Note**: This integration does not support define-style schemas. Only class-based schemas are supported.

lib/datadog/tracing/contrib/graphql/configuration/settings.rb

@@ -34,6 +34,11 @@ class Settings < Contrib::Configuration::Settings
             end
 
             option :service_name
+
+            option :with_deprecated_tracer do |o|
+              o.type :bool
+              o.default false
+            end
           end
         end
       end

lib/datadog/tracing/contrib/graphql/integration.rb

@@ -18,8 +18,7 @@ def self.version
           end
 
           def self.loaded?
-            !defined?(::GraphQL).nil? \
-              && !defined?(::GraphQL::Tracing::DataDogTracing).nil?
+            !defined?(::GraphQL).nil?
           end
 
           # Breaking changes are introduced in `2.2.6` and have been backported to
@@ -37,6 +36,10 @@ def self.compatible?
             )
           end
 
+          def self.trace_supported?
+            version >= Gem::Version.new('2.0.19')
+          end
+
           def new_configuration
             Configuration::Settings.new
           end

lib/datadog/tracing/contrib/graphql/patcher.rb

@@ -1,5 +1,7 @@
 require_relative '../analytics'
 require_relative '../patcher'
+require_relative 'tracing_patcher'
+require_relative 'trace_patcher'
 
 module Datadog
   module Tracing
@@ -16,18 +18,16 @@ def target_version
           end
 
           def patch
-            schemas = configuration[:schemas]
-
-            if schemas.empty?
-              ::GraphQL::Schema.tracer(::GraphQL::Tracing::DataDogTracing.new(**trace_options))
+            if configuration[:with_deprecated_tracer]
+              TracingPatcher.patch!(schemas, trace_options)
+            elsif Integration.trace_supported?
+              TracePatcher.patch!(schemas, trace_options)
             else
-              schemas.each do |schema|
-                if schema.respond_to? :use
-                  schema.use(::GraphQL::Tracing::DataDogTracing, **trace_options)
-                else
-                  Datadog.logger.warn("Unable to patch #{schema}, please migrate to class-based schema.")
-                end
-              end
+              Datadog.logger.warn(
+                "GraphQL version (#{target_version}) does not support GraphQL::Tracing::DataDogTrace. "\
+                'Falling back to GraphQL::Tracing::DataDogTracing.'
+              )
+              TracingPatcher.patch!(schemas, trace_options)
             end
           end
 
@@ -42,6 +42,10 @@ def trace_options
           def configuration
             Datadog.configuration.tracing[:graphql]
           end
+
+          def schemas
+            configuration[:schemas]
+          end
         end
       end
     end

lib/datadog/tracing/contrib/graphql/trace_patcher.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+module Datadog
+  module Tracing
+    module Contrib
+      module GraphQL
+        # Provides instrumentation for `graphql` through with GraphQL's trace
+        module TracePatcher
+          module_function
+
+          def patch!(schemas, options)
+            if schemas.empty?
+              ::GraphQL::Schema.trace_with(::GraphQL::Tracing::DataDogTrace, **options)
+            else
+              schemas.each do |schema|
+                schema.trace_with(::GraphQL::Tracing::DataDogTrace, **options)
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end

lib/datadog/tracing/contrib/graphql/tracing_patcher.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+module Datadog
+  module Tracing
+    module Contrib
+      module GraphQL
+        # Provides instrumentation for `graphql` through the GraphQL's tracing
+        module TracingPatcher
+          module_function
+
+          def patch!(schemas, options)
+            if schemas.empty?
+              ::GraphQL::Schema.tracer(::GraphQL::Tracing::DataDogTracing.new(**options))
+            else
+              schemas.each do |schema|
+                if schema.respond_to? :use
+                  schema.use(::GraphQL::Tracing::DataDogTracing, **options)
+                else
+                  Datadog.logger.warn("Unable to patch #{schema}: Please migrate to class-based schema.")
+                end
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end

sig/datadog/tracing/contrib/graphql/trace_patcher.rbs

@@ -0,0 +1,11 @@
+module Datadog
+  module Tracing
+    module Contrib
+      module GraphQL
+        module TracePatcher
+          def self?.patch!: (::Array[untyped] schemas,  ::Hash[Symbol, untyped] options) -> untyped
+        end
+      end
+    end
+  end
+end

sig/datadog/tracing/contrib/graphql/tracing_patcher.rbs

@@ -0,0 +1,12 @@
+module Datadog
+  module Tracing
+    module Contrib
+      module GraphQL
+        module TracingPatcher
+
+          def self?.patch!: (::Array[untyped] schemas,  ::Hash[Symbol, untyped] options) -> untyped
+        end
+      end
+    end
+  end
+end

spec/datadog/tracing/contrib/graphql/configuration/settings_spec.rb

@@ -28,4 +28,30 @@
       end
     end
   end
+
+  describe 'with_deprecated_tracer' do
+    context 'when default' do
+      it do
+        settings = described_class.new
+
+        expect(settings.with_deprecated_tracer).to eq(false)
+      end
+    end
+
+    context 'when given `true`' do
+      it do
+        settings = described_class.new(with_deprecated_tracer: true)
+
+        expect(settings.with_deprecated_tracer).to eq(true)
+      end
+    end
+
+    context 'when given `false`' do
+      it do
+        settings = described_class.new(with_deprecated_tracer: false)
+
+        expect(settings.with_deprecated_tracer).to eq(false)
+      end
+    end
+  end
 end

spec/datadog/tracing/contrib/graphql/integration_spec.rb

@@ -22,27 +22,19 @@
   describe '.loaded?' do
     subject(:loaded?) { described_class.loaded? }
 
-    context 'when neither GraphQL or GraphQL::Tracing::DataDogTracing are defined' do
+    context 'when GraphQL is not defined' do
       before do
         hide_const('GraphQL')
-        hide_const('GraphQL::Tracing::DataDogTracing')
       end
 
       it { is_expected.to be false }
     end
 
-    context 'when only GraphQL is defined' do
+    context 'when GraphQL is defined' do
       before do
         stub_const('GraphQL', Class.new)
-        hide_const('GraphQL::Tracing::DataDogTracing')
       end
 
-      it { is_expected.to be false }
-    end
-
-    context 'when GraphQL::Tracing::DataDogTracing is defined' do
-      before { stub_const('GraphQL::Tracing::DataDogTracing', Class.new) }
-
       it { is_expected.to be true }
     end
   end
@@ -96,6 +88,20 @@
     it { is_expected.to be(true) }
   end
 
+  describe '.trace_supported?' do
+    subject(:trace_supported) { described_class.trace_supported? }
+
+    context 'with version `2.0.19`' do
+      include_context 'loaded gems', graphql: '2.0.19'
+      it { is_expected.to be true }
+    end
+
+    context 'with version `2.0.18`' do
+      include_context 'loaded gems', graphql: decrement_gem_version('2.0.19')
+      it { is_expected.to be false }
+    end
+  end
+
   describe '#default_configuration' do
     subject(:default_configuration) { integration.default_configuration }