feat(ecs): add BaseService.fromServiceArnWithCluster() for use in C…

…odePipeline (#18530)

This adds support for importing a ECS Cluster via the Arn, and not requiring the VPC or Security Groups.

This will generate an ICluster which can be used in `Ec2Service.fromEc2ServiceAttributes()` and `FargateService.fromFargateServiceAttributes()` to get an `IBaseService` which can be used in the `EcsDeployAction` to allow for cross account/region deployments in CodePipelines.

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-codepipeline-actions/README.md

@@ -764,6 +764,39 @@ const deployStage = pipeline.addStage({
 
 [image definition file]: https://docs.aws.amazon.com/codepipeline/latest/userguide/pipelines-create.html#pipelines-create-image-definitions
 
+#### Deploying ECS applications to existing services
+
+CodePipeline can deploy to an existing ECS service which uses the
+[ECS service ARN format that contains the Cluster name](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs-account-settings.html#ecs-resource-ids).
+This also works if the service is in a different account and/or region than the pipeline:
+
+```ts
+import * as ecs from '@aws-cdk/aws-ecs';
+
+const service = ecs.BaseService.fromServiceArnWithCluster(this, 'EcsService',
+  'arn:aws:ecs:us-east-1:123456789012:service/myClusterName/myServiceName'
+);
+const pipeline = new codepipeline.Pipeline(this, 'MyPipeline');
+const buildOutput = new codepipeline.Artifact();
+// add source and build stages to the pipeline as usual...
+const deployStage = pipeline.addStage({
+  stageName: 'Deploy',
+  actions: [
+    new codepipeline_actions.EcsDeployAction({
+      actionName: 'DeployAction',
+      service: service,
+      input: buildOutput,
+    }),
+  ],
+});
+```
+
+When deploying across accounts, especially in a CDK Pipelines self-mutating pipeline,
+it is recommended to provide the `role` property to the `EcsDeployAction`. 
+The Role will need to have permissions assigned to it for ECS deployment.
+See [the CodePipeline documentation](https://docs.aws.amazon.com/codepipeline/latest/userguide/how-to-custom-role.html#how-to-update-role-new-services)
+for the permissions needed.
+
 #### Deploying ECS applications stored in a separate source code repository
 
 The idiomatic CDK way of deploying an ECS application is to have your Dockerfiles and your CDK code in the same source code repository,

packages/@aws-cdk/aws-codepipeline-actions/test/ecs/ecs-deploy-action.test.ts

@@ -196,6 +196,84 @@ describe('ecs deploy action', () => {
 
 
     });
+
+    test('can be created by existing service with cluster ARN format', () => {
+      const app = new cdk.App();
+      const stack = new cdk.Stack(app, 'PipelineStack', {
+        env: {
+          region: 'pipeline-region', account: 'pipeline-account',
+        },
+      });
+      const clusterName = 'cluster-name';
+      const serviceName = 'service-name';
+      const region = 'service-region';
+      const account = 'service-account';
+      const serviceArn = `arn:aws:ecs:${region}:${account}:service/${clusterName}/${serviceName}`;
+      const service = ecs.BaseService.fromServiceArnWithCluster(stack, 'FargateService', serviceArn);
+
+      const artifact = new codepipeline.Artifact('Artifact');
+      const bucket = new s3.Bucket(stack, 'PipelineBucket', {
+        versioned: true,
+        removalPolicy: cdk.RemovalPolicy.DESTROY,
+      });
+      const source = new cpactions.S3SourceAction({
+        actionName: 'Source',
+        output: artifact,
+        bucket,
+        bucketKey: 'key',
+      });
+      const action = new cpactions.EcsDeployAction({
+        actionName: 'ECS',
+        service: service,
+        input: artifact,
+      });
+      new codepipeline.Pipeline(stack, 'Pipeline', {
+        stages: [
+          {
+            stageName: 'Source',
+            actions: [source],
+          },
+          {
+            stageName: 'Deploy',
+            actions: [action],
+          },
+        ],
+      });
+
+      Template.fromStack(stack).hasResourceProperties('AWS::CodePipeline::Pipeline', {
+        Stages: [
+          {},
+          {
+            Actions: [
+              {
+                Name: 'ECS',
+                ActionTypeId: {
+                  Category: 'Deploy',
+                  Provider: 'ECS',
+                },
+                Configuration: {
+                  ClusterName: clusterName,
+                  ServiceName: serviceName,
+                },
+                Region: region,
+                RoleArn: {
+                  'Fn::Join': [
+                    '',
+                    [
+                      'arn:',
+                      {
+                        Ref: 'AWS::Partition',
+                      },
+                      `:iam::${account}:role/pipelinestack-support-serloyecsactionrole49867f847238c85af7c0`,
+                    ],
+                  ],
+                },
+              },
+            ],
+          },
+        ],
+      });
+    });
   });
 });
 

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

@@ -96,6 +96,15 @@ const cluster = new ecs.Cluster(this, 'Cluster', {
 });
 ```
 
+The following code imports an existing cluster using the ARN which can be used to 
+import an Amazon ECS service either EC2 or Fargate.
+
+```ts
+const clusterArn = 'arn:aws:ecs:us-east-1:012345678910:cluster/clusterName';
+
+const cluster = ecs.Cluster.fromClusterArn(this, 'Cluster', clusterArn);
+```
+
 To use tasks with Amazon EC2 launch-type, you have to add capacity to
 the cluster in order for tasks to be scheduled on your instances.  Typically,
 you add an AutoScalingGroup with instances running the latest

packages/@aws-cdk/aws-ecs/lib/base/base-service.ts

@@ -5,10 +5,10 @@ import * as elb from '@aws-cdk/aws-elasticloadbalancing';
 import * as elbv2 from '@aws-cdk/aws-elasticloadbalancingv2';
 import * as iam from '@aws-cdk/aws-iam';
 import * as cloudmap from '@aws-cdk/aws-servicediscovery';
-import { Annotations, Duration, IResolvable, IResource, Lazy, Resource, Stack } from '@aws-cdk/core';
+import { Annotations, Duration, IResolvable, IResource, Lazy, Resource, Stack, ArnFormat } from '@aws-cdk/core';
 import { Construct } from 'constructs';
 import { LoadBalancerTargetOptions, NetworkMode, TaskDefinition } from '../base/task-definition';
-import { ICluster, CapacityProviderStrategy, ExecuteCommandLogging } from '../cluster';
+import { ICluster, CapacityProviderStrategy, ExecuteCommandLogging, Cluster } from '../cluster';
 import { ContainerDefinition, Protocol } from '../container-definition';
 import { CfnService } from '../ecs.generated';
 import { ScalableTaskCount } from './scalable-task-count';
@@ -315,6 +315,46 @@ export interface IBaseService extends IService {
  */
 export abstract class BaseService extends Resource
   implements IBaseService, elbv2.IApplicationLoadBalancerTarget, elbv2.INetworkLoadBalancerTarget, elb.ILoadBalancerTarget {
+  /**
+   * Import an existing ECS/Fargate Service using the service cluster format.
+   * The format is the "new" format "arn:aws:ecs:region:aws_account_id:service/cluster-name/service-name".
+   * @see https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs-account-settings.html#ecs-resource-ids
+   */
+  public static fromServiceArnWithCluster(scope: Construct, id: string, serviceArn: string): IBaseService {
+    const stack = Stack.of(scope);
+    const arn = stack.splitArn(serviceArn, ArnFormat.SLASH_RESOURCE_NAME);
+    const resourceName = arn.resourceName;
+    if (!resourceName) {
+      throw new Error('Missing resource Name from service ARN: ${serviceArn}');
+    }
+    const resourceNameParts = resourceName.split('/');
+    if (resourceNameParts.length !== 2) {
+      throw new Error(`resource name ${resourceName} from service ARN: ${serviceArn} is not using the ARN cluster format`);
+    }
+    const clusterName = resourceNameParts[0];
+    const serviceName = resourceNameParts[1];
+
+    const clusterArn = Stack.of(scope).formatArn({
+      partition: arn.partition,
+      region: arn.region,
+      account: arn.account,
+      service: 'ecs',
+      resource: 'cluster',
+      resourceName: clusterName,
+    });
+
+    const cluster = Cluster.fromClusterArn(scope, `${id}Cluster`, clusterArn);
+
+    class Import extends Resource implements IBaseService {
+      public readonly serviceArn = serviceArn;
+      public readonly serviceName = serviceName;
+      public readonly cluster = cluster;
+    }
+
+    return new Import(scope, id, {
+      environmentFromArn: serviceArn,
+    });
+  }
 
   /**
    * The security groups which manage the allowed network traffic for the service.

packages/@aws-cdk/aws-ecs/lib/cluster.ts

@@ -6,7 +6,7 @@ import * as kms from '@aws-cdk/aws-kms';
 import * as logs from '@aws-cdk/aws-logs';
 import * as s3 from '@aws-cdk/aws-s3';
 import * as cloudmap from '@aws-cdk/aws-servicediscovery';
-import { Duration, Lazy, IResource, Resource, Stack, Aspects, IAspect, IConstruct } from '@aws-cdk/core';
+import { Duration, Lazy, IResource, Resource, Stack, Aspects, IAspect, IConstruct, ArnFormat } from '@aws-cdk/core';
 import { Construct } from 'constructs';
 import { BottleRocketImage, EcsOptimizedAmi } from './amis';
 import { InstanceDrainHook } from './drain-hook/instance-drain-hook';
@@ -105,6 +105,41 @@ export class Cluster extends Resource implements ICluster {
     return new ImportedCluster(scope, id, attrs);
   }
 
+  /**
+   * Import an existing cluster to the stack from the cluster ARN.
+   * This does not provide access to the vpc, hasEc2Capacity, or connections -
+   * use the `fromClusterAttributes` method to access those properties.
+   */
+  public static fromClusterArn(scope: Construct, id: string, clusterArn: string): ICluster {
+    const stack = Stack.of(scope);
+    const arn = stack.splitArn(clusterArn, ArnFormat.SLASH_RESOURCE_NAME);
+    const clusterName = arn.resourceName;
+
+    if (!clusterName) {
+      throw new Error(`Missing required Cluster Name from Cluster ARN: ${clusterArn}`);
+    }
+
+    const errorSuffix = 'is not available for a Cluster imported using fromClusterArn(), please use fromClusterAttributes() instead.';
+
+    class Import extends Resource implements ICluster {
+      public readonly clusterArn = clusterArn;
+      public readonly clusterName = clusterName!;
+      get hasEc2Capacity(): boolean {
+        throw new Error(`hasEc2Capacity ${errorSuffix}`);
+      }
+      get connections(): ec2.Connections {
+        throw new Error(`connections ${errorSuffix}`);
+      }
+      get vpc(): ec2.IVpc {
+        throw new Error(`vpc ${errorSuffix}`);
+      }
+    }
+
+    return new Import(scope, id, {
+      environmentFromArn: clusterArn,
+    });
+  }
+
   /**
    * Manage the allowed network connections for the cluster with Security Groups.
    */

packages/@aws-cdk/aws-ecs/test/base-service.test.ts

@@ -0,0 +1,44 @@
+import * as cdk from '@aws-cdk/core';
+import * as ecs from '../lib';
+
+let stack: cdk.Stack;
+
+beforeEach(() => {
+  stack = new cdk.Stack();
+});
+
+describe('When import an ECS Service', () => {
+  test('with serviceArnWithCluster', () => {
+    // GIVEN
+    const clusterName = 'cluster-name';
+    const serviceName = 'my-http-service';
+    const region = 'service-region';
+    const account = 'service-account';
+    const serviceArn = `arn:aws:ecs:${region}:${account}:service/${clusterName}/${serviceName}`;
+
+    // WHEN
+    const service = ecs.BaseService.fromServiceArnWithCluster(stack, 'Service', serviceArn);
+
+    // THEN
+    expect(service.serviceArn).toEqual(serviceArn);
+    expect(service.serviceName).toEqual(serviceName);
+    expect(service.env.account).toEqual(account);
+    expect(service.env.region).toEqual(region);
+
+    expect(service.cluster.clusterName).toEqual(clusterName);
+    expect(service.cluster.env.account).toEqual(account);
+    expect(service.cluster.env.region).toEqual(region);
+  });
+
+  test('throws an expection if no resourceName provided on fromServiceArnWithCluster', () => {
+    expect(() => {
+      ecs.BaseService.fromServiceArnWithCluster(stack, 'Service', 'arn:aws:ecs:service-region:service-account:service');
+    }).toThrowError(/Missing resource Name from service ARN/);
+  });
+
+  test('throws an expection if not using cluster arn format on fromServiceArnWithCluster', () => {
+    expect(() => {
+      ecs.BaseService.fromServiceArnWithCluster(stack, 'Service', 'arn:aws:ecs:service-region:service-account:service/my-http-service');
+    }).toThrowError(/is not using the ARN cluster format/);
+  });
+});

packages/@aws-cdk/aws-ecs/test/cluster.test.ts

@@ -2140,6 +2140,30 @@ describe('cluster', () => {
 
 
   });
+
+  test('When importing ECS Cluster via Arn', () => {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const clusterName = 'my-cluster';
+    const region = 'service-region';
+    const account = 'service-account';
+    const cluster = ecs.Cluster.fromClusterArn(stack, 'Cluster', `arn:aws:ecs:${region}:${account}:cluster/${clusterName}`);
+
+    // THEN
+    expect(cluster.clusterName).toEqual(clusterName);
+    expect(cluster.env.region).toEqual(region);
+    expect(cluster.env.account).toEqual(account);
+  });
+
+  test('throws error when import ECS Cluster without resource name in arn', () => {
+    // GIVEN
+    const stack = new cdk.Stack();
+
+    // THEN
+    expect(() => {
+      ecs.Cluster.fromClusterArn(stack, 'Cluster', 'arn:aws:ecs:service-region:service-account:cluster');
+    }).toThrowError(/Missing required Cluster Name from Cluster ARN: /);
+  });
 });
 
 test('can add ASG capacity via Capacity Provider by not specifying machineImageType', () => {