feat(appsync): add x-ray parameter to AppSync

packages/@aws-cdk/aws-appsync/README.md

@@ -158,4 +158,16 @@ api.grantMutation(role, 'updateExample');
 
 // For custom types and granular design
 api.grant(role, appsync.IamResource.ofType('Mutation', 'updateExample'), 'appsync:GraphQL');
-```
+```
+
+## AppSync with X-Ray Tracing
+
+```ts
+const api = new appsync.GraphQLApi(stack, 'Api', {
+  name: 'demo',
+  schemaDefinitionFile: join(__dirname, 'schema.graphql'),
+  xrayEnabled: true,
+});
+```
+
+See the  [the AWS documentation](https://docs.aws.amazon.com/appsync/latest/devguide/x-ray-tracing.html) to learn more about AWS AppSync's X-Ray support.

packages/@aws-cdk/aws-appsync/lib/graphqlapi.ts

@@ -238,6 +238,12 @@ export interface GraphQLApiProps {
    * @default - Use schemaDefinition
    */
   readonly schemaDefinitionFile?: string;
+  /**
+   * A flag indicating whether or not X-Ray tracing is enabled for the GraphQL API.
+   *
+   * @default - false
+   */
+  readonly xrayEnabled?: boolean;
 
 }
 
@@ -383,6 +389,7 @@ export class GraphQLApi extends Construct {
           )
           : undefined,
       additionalAuthenticationProviders: this.formatAdditionalAuthenticationProviders(props),
+      xrayEnabled: props.xrayEnabled || false,
     });
 
     this.apiId = this.api.attrApiId;

packages/@aws-cdk/aws-appsync/test/appsync.test.ts

@@ -90,4 +90,22 @@ test('appsync should configure resolver as unit when pipelineConfig is empty arr
   expect(stack).toHaveResourceLike('AWS::AppSync::Resolver', {
     Kind: 'UNIT',
   });
+});
+
+test('when xray is enabled should not throw an Error', () => {
+  // GIVEN
+  const stack = new cdk.Stack();
+
+  // WHEN
+  new appsync.GraphQLApi(stack, 'api', {
+    authorizationConfig: {},
+    name: 'api',
+    schemaDefinitionFile: path.join(__dirname, 'appsync.test.graphql'),
+    xrayEnabled: true,
+  });
+
+  // THEN
+  expect(stack).toHaveResourceLike('AWS::AppSync::GraphQLApi', {
+    XrayEnabled: true,
+  });
 });

packages/@aws-cdk/aws-appsync/test/integ.graphql-iam.expected.json

@@ -94,7 +94,8 @@
           "UserPoolId": {
             "Ref": "PoolD3F588B8"
           }
-        }
+        },
+        "XrayEnabled": false
       }
     },
     "ApiSchema510EECD7": {

packages/@aws-cdk/aws-appsync/test/integ.graphql.expected.json

@@ -94,7 +94,8 @@
           "UserPoolId": {
             "Ref": "PoolD3F588B8"
           }
-        }
+        },
+        "XrayEnabled": false
       }
     },
     "ApiDefaultAPIKeyApiKey74F5313B": {