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1"use strict";
2Object.defineProperty(exports, "__esModule", { value: true });
3exports.InstanceDrainHook = void 0;
4const fs = require("fs");
5const path = require("path");
6const autoscaling = require("@aws-cdk/aws-autoscaling");
7const hooks = require("@aws-cdk/aws-autoscaling-hooktargets");
8const iam = require("@aws-cdk/aws-iam");
9const lambda = require("@aws-cdk/aws-lambda");
10const cdk = require("@aws-cdk/core");
11// keep this import separate from other imports to reduce chance for merge conflicts with v2-main
12// eslint-disable-next-line no-duplicate-imports, import/order
13const core_1 = require("@aws-cdk/core");
14/**
15 * A hook to drain instances from ECS traffic before they're terminated
16 */
17class InstanceDrainHook extends core_1.Construct {
18 /**
19 * Constructs a new instance of the InstanceDrainHook class.
20 */
21 constructor(scope, id, props) {
22 super(scope, id);
23 const drainTime = props.drainTime || cdk.Duration.minutes(5);
24 // Invoke Lambda via SNS Topic
25 const fn = new lambda.Function(this, 'Function', {
26 code: lambda.Code.fromInline(fs.readFileSync(path.join(__dirname, 'lambda-source', 'index.py'), { encoding: 'utf-8' })),
27 handler: 'index.lambda_handler',
28 runtime: lambda.Runtime.PYTHON_3_6,
29 // Timeout: some extra margin for additional API calls made by the Lambda,
30 // up to a maximum of 15 minutes.
31 timeout: cdk.Duration.seconds(Math.min(drainTime.toSeconds() + 10, 900)),
32 environment: {
33 CLUSTER: props.cluster.clusterName,
34 },
35 });
36 // Hook everything up: ASG -> Topic, Topic -> Lambda
37 props.autoScalingGroup.addLifecycleHook('DrainHook', {
38 lifecycleTransition: autoscaling.LifecycleTransition.INSTANCE_TERMINATING,
39 defaultResult: autoscaling.DefaultResult.CONTINUE,
40 notificationTarget: new hooks.FunctionHook(fn, props.topicEncryptionKey),
41 heartbeatTimeout: drainTime,
42 });
43 // Describe actions cannot be restricted and restrict the CompleteLifecycleAction to the ASG arn
44 // https://docs.aws.amazon.com/autoscaling/ec2/userguide/control-access-using-iam.html
45 fn.addToRolePolicy(new iam.PolicyStatement({
46 actions: [
47 'ec2:DescribeInstances',
48 'ec2:DescribeInstanceAttribute',
49 'ec2:DescribeInstanceStatus',
50 'ec2:DescribeHosts',
51 ],
52 resources: ['*'],
53 }));
54 // Restrict to the ASG
55 fn.addToRolePolicy(new iam.PolicyStatement({
56 actions: ['autoscaling:CompleteLifecycleAction'],
57 resources: [props.autoScalingGroup.autoScalingGroupArn],
58 }));
59 fn.addToRolePolicy(new iam.PolicyStatement({
60 actions: ['ecs:DescribeContainerInstances', 'ecs:DescribeTasks'],
61 resources: ['*'],
62 conditions: {
63 ArnEquals: { 'ecs:cluster': props.cluster.clusterArn },
64 },
65 }));
66 // Restrict to the ECS Cluster
67 fn.addToRolePolicy(new iam.PolicyStatement({
68 actions: [
69 'ecs:ListContainerInstances',
70 'ecs:SubmitContainerStateChange',
71 'ecs:SubmitTaskStateChange',
72 ],
73 resources: [props.cluster.clusterArn],
74 }));
75 // Restrict the container-instance operations to the ECS Cluster
76 fn.addToRolePolicy(new iam.PolicyStatement({
77 actions: [
78 'ecs:UpdateContainerInstancesState',
79 'ecs:ListTasks',
80 ],
81 conditions: {
82 ArnEquals: { 'ecs:cluster': props.cluster.clusterArn },
83 },
84 resources: ['*'],
85 }));
86 }
87}
88exports.InstanceDrainHook = InstanceDrainHook;
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If provided, then this\n   * key will be used to encrypt the contents of that SNS Topic.\n   * See [SNS Data Encryption](https://docs.aws.amazon.com/sns/latest/dg/sns-data-encryption.html) for more information.\n   *\n   * @default The SNS Topic will not be encrypted.\n   */\n  topicEncryptionKey?: kms.IKey;\n}\n\n/**\n * A hook to drain instances from ECS traffic before they're terminated\n */\nexport class InstanceDrainHook extends CoreConstruct {\n\n  /**\n   * Constructs a new instance of the InstanceDrainHook class.\n   */\n  constructor(scope: Construct, id: string, props: InstanceDrainHookProps) {\n    super(scope, id);\n\n    const drainTime = props.drainTime || cdk.Duration.minutes(5);\n\n    // Invoke Lambda via SNS Topic\n    const fn = new lambda.Function(this, 'Function', {\n      code: lambda.Code.fromInline(fs.readFileSync(path.join(__dirname, 'lambda-source', 'index.py'), { encoding: 'utf-8' })),\n      handler: 'index.lambda_handler',\n      runtime: lambda.Runtime.PYTHON_3_6,\n      // Timeout: some extra margin for additional API calls made by the Lambda,\n      // up to a maximum of 15 minutes.\n      timeout: cdk.Duration.seconds(Math.min(drainTime.toSeconds() + 10, 900)),\n      environment: {\n        CLUSTER: props.cluster.clusterName,\n      },\n    });\n\n    // Hook everything up: ASG -> Topic, Topic -> Lambda\n    props.autoScalingGroup.addLifecycleHook('DrainHook', {\n      lifecycleTransition: autoscaling.LifecycleTransition.INSTANCE_TERMINATING,\n      defaultResult: autoscaling.DefaultResult.CONTINUE,\n      notificationTarget: new hooks.FunctionHook(fn, props.topicEncryptionKey),\n      heartbeatTimeout: drainTime,\n    });\n\n    // Describe actions cannot be restricted and restrict the CompleteLifecycleAction to the ASG arn\n    // https://docs.aws.amazon.com/autoscaling/ec2/userguide/control-access-using-iam.html\n    fn.addToRolePolicy(new iam.PolicyStatement({\n      actions: [\n        'ec2:DescribeInstances',\n        'ec2:DescribeInstanceAttribute',\n        'ec2:DescribeInstanceStatus',\n        'ec2:DescribeHosts',\n      ],\n      resources: ['*'],\n    }));\n\n    // Restrict to the ASG\n    fn.addToRolePolicy(new iam.PolicyStatement({\n      actions: ['autoscaling:CompleteLifecycleAction'],\n      resources: [props.autoScalingGroup.autoScalingGroupArn],\n    }));\n\n    fn.addToRolePolicy(new iam.PolicyStatement({\n      actions: ['ecs:DescribeContainerInstances', 'ecs:DescribeTasks'],\n      resources: ['*'],\n      conditions: {\n        ArnEquals: { 'ecs:cluster': props.cluster.clusterArn },\n      },\n    }));\n\n    // Restrict to the ECS Cluster\n    fn.addToRolePolicy(new iam.PolicyStatement({\n      actions: [\n        'ecs:ListContainerInstances',\n        'ecs:SubmitContainerStateChange',\n        'ecs:SubmitTaskStateChange',\n      ],\n      resources: [props.cluster.clusterArn],\n    }));\n\n    // Restrict the container-instance operations to the ECS Cluster\n    fn.addToRolePolicy(new iam.PolicyStatement({\n      actions: [\n        'ecs:UpdateContainerInstancesState',\n        'ecs:ListTasks',\n      ],\n      conditions: {\n        ArnEquals: { 'ecs:cluster': props.cluster.clusterArn },\n      },\n      resources: ['*'],\n    }));\n  }\n}\n"]}
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