fix(ecs): 'desiredCount' and 'ephemeralStorageGiB' cannot be tokens

packages/@aws-cdk/aws-ecs-patterns/lib/base/application-load-balanced-service-base.ts

@@ -413,7 +413,7 @@ export abstract class ApplicationLoadBalancedServiceBase extends CoreConstruct {
     }
     this.cluster = props.cluster || this.getDefaultCluster(this, props.vpc);
 
-    if (props.desiredCount !== undefined && props.desiredCount < 1) {
+    if (props.desiredCount !== undefined && !cdk.Token.isUnresolved(props.desiredCount) && props.desiredCount < 1) {
       throw new Error('You must specify a desiredCount greater than 0');
     }
 

packages/@aws-cdk/aws-ecs-patterns/test/fargate/load-balanced-fargate-service.test.ts

@@ -1047,3 +1047,29 @@ test('test Network load balanced service with docker labels defined', () => {
     ],
   });
 });
+
+test('Passing in token for desiredCount will not throw error', () => {
+  // GIVEN
+  const stack = new cdk.Stack();
+  const vpc = new ec2.Vpc(stack, 'VPC');
+  const cluster = new ecs.Cluster(stack, 'Cluster', { vpc });
+  const param = new cdk.CfnParameter(stack, 'prammm', {
+    type: 'Number',
+    default: 1,
+  });
+
+  // WHEN
+  const service = new ecsPatterns.ApplicationLoadBalancedFargateService(stack, 'Service', {
+    cluster,
+    taskImageOptions: {
+      image: ecs.ContainerImage.fromRegistry('/aws/aws-example-app'),
+      dockerLabels: { label1: 'labelValue1', label2: 'labelValue2' },
+    },
+    desiredCount: param.valueAsNumber,
+  });
+
+  // THEN
+  expect(() => {
+    service.internalDesiredCount;
+  }).toBeTruthy;
+});

packages/@aws-cdk/aws-ecs/lib/fargate/fargate-task-definition.ts

@@ -1,4 +1,4 @@
-import { Tokenization } from '@aws-cdk/core';
+import { Tokenization, Token } from '@aws-cdk/core';
 import { Construct } from 'constructs';
 import { ImportedTaskDefinition } from '../base/_imported-task-definition';
 import {
@@ -140,7 +140,8 @@ export class FargateTaskDefinition extends TaskDefinition implements IFargateTas
       networkMode: NetworkMode.AWS_VPC,
     });
 
-    if (props.ephemeralStorageGiB && (props.ephemeralStorageGiB < 21 || props.ephemeralStorageGiB > 200)) {
+    // eslint-disable-next-line max-len
+    if (props.ephemeralStorageGiB && !Token.isUnresolved(props.ephemeralStorageGiB) && (props.ephemeralStorageGiB < 21 || props.ephemeralStorageGiB > 200)) {
       throw new Error('Ephemeral storage size must be between 21GiB and 200GiB');
     }
 

packages/@aws-cdk/aws-ecs/test/fargate/fargate-task-definition.test.ts

@@ -251,6 +251,25 @@ describe('fargate task definition', () => {
         'Add the \'taskRole\' in ImportedTaskDefinitionProps to instantiate ImportedTaskDefinition');
     });
 
+    test('Passing in token for ephemeral storage will not throw error', () => {
+      // GIVEN
+      const stack = new cdk.Stack();
+
+      // WHEN
+      const param = new cdk.CfnParameter(stack, 'prammm', {
+        type: 'Number',
+        default: 1,
+      });
+
+      const taskDefinition = new ecs.FargateTaskDefinition(stack, 'FargateTaskDef', {
+        ephemeralStorageGiB: param.valueAsNumber,
+      });
+
+      // THEN
+      expect(() => {
+        taskDefinition.ephemeralStorageGiB;
+      }).toBeTruthy;
+    });
 
     test('runtime testing for windows container', () => {
       // GIVEN