cdk-construct-simple-nat
Version:
A CDK construct to build Simple NAT instance on AWS.
309 lines • 47.6 kB
JavaScript
"use strict";
var _a;
Object.defineProperty(exports, "__esModule", { value: true });
exports.SimpleNAT = void 0;
const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti");
/* eslint @typescript-eslint/no-require-imports: "off" */
const fs = require("fs");
const path = require("path");
const aws_cdk_lib_1 = require("aws-cdk-lib");
const aws_ec2_1 = require("aws-cdk-lib/aws-ec2");
const aws_iam_1 = require("aws-cdk-lib/aws-iam");
const Mustache = require("mustache");
const fetch = require('sync-fetch');
/**
* Simple NAT instances construct.
*/
class SimpleNAT extends aws_cdk_lib_1.Resource {
constructor(scope, id, props) {
super(scope, id);
this.gateways = new PrefSet();
this._routeTablesLimit = new Map();
this._defaultRoutesPerTable = 50;
this._ipV6Regex = new RegExp(SimpleNAT.Ipv6Regex);
let subnets;
try {
subnets = props.vpc.selectSubnets(props.natSubnetsSelection ?? {
subnetType: aws_ec2_1.SubnetType.PUBLIC,
onePerAz: true,
});
}
catch (e) {
throw new Error('NAT instances must reside in public subnets.');
}
if (!subnets.hasPublic) {
throw new Error('The custom NAT subnet selection MUST select PUBLIC subnets.');
}
const machineImage = props.machineImage ?? aws_ec2_1.MachineImage.latestAmazonLinux2({
storage: aws_ec2_1.AmazonLinuxStorage.GENERAL_PURPOSE,
cpuType: aws_ec2_1.AmazonLinuxCpuType.X86_64,
});
if (machineImage.getImage(this).osType != aws_ec2_1.OperatingSystemType.LINUX) {
throw new Error('The OS of custom AMI must be Linux.');
}
this._securityGroup = new aws_ec2_1.SecurityGroup(scope, 'NatSecurityGroup', {
vpc: props.vpc,
description: 'Security Group for NAT instances',
allowAllOutbound: true,
});
this._securityGroup.addIngressRule(aws_ec2_1.Peer.ipv4(props.vpc.vpcCidrBlock), aws_ec2_1.Port.allTraffic());
const role = props.role ?? new aws_iam_1.Role(scope, 'NatRole', {
assumedBy: new aws_iam_1.ServicePrincipal('ec2.amazonaws.com'),
});
role.addManagedPolicy(aws_iam_1.ManagedPolicy.fromAwsManagedPolicyName('AmazonSSMManagedInstanceCore'));
role.addToPrincipalPolicy(new aws_iam_1.PolicyStatement({
actions: [
'ec2:AttachNetworkInterface',
'ec2:DetachNetworkInterface',
'ec2:DescribeNetworkInterfaces',
],
resources: ['*'],
}));
for (const sub of subnets.subnets) {
const eni = new aws_ec2_1.CfnNetworkInterface(sub, 'ENI1', {
subnetId: sub.subnetId,
sourceDestCheck: false,
description: 'ENI for binding EIP',
groupSet: [this._securityGroup.securityGroupId],
});
const eip = new aws_ec2_1.CfnEIP(sub, 'NatInstanceEIP', {
tags: [
{
key: 'Name',
value: `EIP for NAT instance in subnet '${sub.subnetId}'.`,
},
],
});
eip.applyRemovalPolicy(aws_cdk_lib_1.RemovalPolicy.RETAIN);
new aws_ec2_1.CfnEIPAssociation(sub, 'EIPAssociation', {
allocationId: eip.attrAllocationId,
networkInterfaceId: eni.ref,
});
const configs = [
aws_ec2_1.InitFile.fromFileInline('/opt/nat/snat.sh', path.join(__dirname, 'snat.sh'), {
mode: '000755',
}),
aws_ec2_1.InitFile.fromFileInline('/etc/systemd/system/snat.service', path.join(__dirname, 'snat.service')),
aws_ec2_1.InitFile.fromString('/opt/nat/runonce.sh', Mustache.render(fs.readFileSync(path.join(__dirname, 'runonce.sh'), 'utf-8'), {
eniId: eni.ref,
}), {
mode: '000755',
}),
aws_ec2_1.InitCommand.shellCommand('/opt/nat/runonce.sh'),
];
if (props.customScripts) {
configs.push(aws_ec2_1.InitFile.fromString('/opt/nat/custom.sh', props.customScripts, {
mode: '000755',
}));
configs.push(aws_ec2_1.InitCommand.shellCommand('/opt/nat/custom.sh'));
}
const natInstance = new aws_ec2_1.Instance(sub, 'NatInstance', {
instanceType: props.instanceType ?? aws_ec2_1.InstanceType.of(aws_ec2_1.InstanceClass.T3, aws_ec2_1.InstanceSize.MICRO),
machineImage,
vpc: props.vpc,
vpcSubnets: { subnets: [sub] },
securityGroup: this._securityGroup,
role,
keyPair: props.keyName ? aws_ec2_1.KeyPair.fromKeyPairName(this, 'KeyPair', props.keyName) : undefined,
init: aws_ec2_1.CloudFormationInit.fromConfigSets({
configSets: {
default: ['yumPreinstall', 'config'],
},
configs: {
yumPreinstall: new aws_ec2_1.InitConfig([
// Install an Amazon Linux package using yum
aws_ec2_1.InitPackage.yum('jq'),
]),
config: new aws_ec2_1.InitConfig(configs),
},
}),
initOptions: {
// Optional, which configsets to activate (['default'] by default)
configSets: ['default'],
timeout: aws_cdk_lib_1.Duration.minutes(5 + (props.customScripts ? 10 : 0)),
},
});
// NAT instance routes all traffic, both ways
this.gateways.add(sub.availabilityZone, {
instance: natInstance,
eni,
});
}
this._routeMappingSubnets = props.vpc.selectSubnets(props.privateSubnetsSelection ?? {
subnetType: aws_ec2_1.SubnetType.PRIVATE_WITH_EGRESS,
}).subnets.reduce((routeMapping, sub) => {
if (routeMapping.has(sub.routeTable.routeTableId)) {
routeMapping.get(sub.routeTable.routeTableId).push(sub);
}
else {
routeMapping.set(sub.routeTable.routeTableId, [sub]);
}
return routeMapping;
}, new Map());
aws_cdk_lib_1.Tags.of(this).add('construct', 'simple-nat');
}
addV4Route(v4CIDR) {
// Add routes to them in the private subnets
for (const [routeId, subnets] of this._routeMappingSubnets) {
this._configureSubnet(routeId, subnets, v4CIDR);
}
return this;
}
addV6Route(v6CIDR) {
// Add routes to them in the private subnets
for (const [routeId, subnets] of this._routeMappingSubnets) {
this._configureSubnet(routeId, subnets, undefined, v6CIDR);
}
return this;
}
/**
* Add Github IPs to route table
*/
withGithubRoute(props) {
const githubMeta = fetch('https://api.github.com/meta').json();
for (const cidr of githubMeta.git) {
for (const [routeId, subnets] of this._routeMappingSubnets) {
if (this._ipV6Regex.test(cidr)) {
const excludeIPv6 = props?.excludeIPv6 ?? false;
if (!excludeIPv6) {
this._configureSubnet(routeId, subnets, undefined, cidr);
}
}
else {
this._configureSubnet(routeId, subnets, cidr);
}
}
}
return this;
}
/**
* Add Google IPs to route table
*/
withGoogleRoute(props) {
const googleMeta = fetch('https://www.gstatic.com/ipranges/goog.json').json();
const excludeIPv6 = props?.excludeIPv6 ?? false;
for (const cidr of googleMeta.prefixes) {
for (const [routeId, subnets] of this._routeMappingSubnets) {
if (cidr.ipv4Prefix) {
this._configureSubnet(routeId, subnets, cidr.ipv4Prefix);
}
if (cidr.ipv6Prefix && !excludeIPv6) {
this._configureSubnet(routeId, subnets, undefined, cidr.ipv6Prefix);
}
}
}
return this;
}
/**
* Add Cloudflare IPs to route table
*
* See https://www.cloudflare.com/ips/ for details
*/
withCloudflareRoute(props) {
const ipV4 = fetch('https://www.cloudflare.com/ips-v4').text().split(/\r?\n/);
for (const cidr of ipV4) {
for (const [routeId, subnets] of this._routeMappingSubnets) {
this._configureSubnet(routeId, subnets, cidr);
}
}
const excludeIPv6 = props?.excludeIPv6 ?? false;
if (!excludeIPv6) {
const ipV6 = fetch('https://www.cloudflare.com/ips-v6').text().split(/\r?\n/);
for (const cidr of ipV6) {
for (const [routeId, subnets] of this._routeMappingSubnets) {
this._configureSubnet(routeId, subnets, undefined, cidr);
}
}
}
return this;
}
_configureSubnet(_routeId, subnets, v4CIDR, v6CIDR) {
const az = subnets[0].availabilityZone;
const natInstance = this.gateways.pick(az);
this._addRoute(`Route-${v4CIDR ? 'v4-' + v4CIDR?.replace(/[./]/gi, '-') : 'v6-' + v6CIDR?.replace(/[:/]/gi, '-')}`, subnets[0], {
destinationCidrBlock: v4CIDR,
destinationIpv6CidrBlock: v6CIDR,
routerType: aws_ec2_1.RouterType.NETWORK_INTERFACE,
routerId: natInstance.eni.ref,
enablesInternetConnectivity: true,
});
return this;
}
_addRoute(id, subnet, options) {
if (options.destinationCidrBlock && options.destinationIpv6CidrBlock) {
throw new Error('Cannot specify both \'destinationCidrBlock\' and \'destinationIpv6CidrBlock\'');
}
new aws_ec2_1.CfnRoute(subnet, id, {
routeTableId: subnet.routeTable.routeTableId,
destinationCidrBlock: options.destinationCidrBlock ?? (options.destinationIpv6CidrBlock === undefined ? '0.0.0.0/0' : undefined),
destinationIpv6CidrBlock: options.destinationIpv6CidrBlock,
[routerTypeToPropName(options.routerType)]: options.routerId,
});
const isIpv4 = (options.destinationCidrBlock != undefined);
if (this._routeTablesLimit.has(subnet.routeTable.routeTableId)) {
const stats = this._routeTablesLimit.get(subnet.routeTable.routeTableId);
if (isIpv4) {
stats.ipv4 += 1;
}
else {
stats.ipv6 += 1;
}
this._routeTablesLimit.set(subnet.routeTable.routeTableId, stats);
const totalRoutes = (isIpv4 ? stats.ipv4 : stats.ipv6);
if (totalRoutes > this._defaultRoutesPerTable) {
aws_cdk_lib_1.Annotations.of(this).addWarning(`The current routes in route table '${subnet.routeTable.routeTableId}' is ${totalRoutes} which exceeds the default limit ${this._defaultRoutesPerTable}. You can open ticket to increase it.`);
}
}
else {
this._routeTablesLimit.set(subnet.routeTable.routeTableId, {
ipv4: isIpv4 ? 1 : 0,
ipv6: isIpv4 ? 0 : 1,
});
}
}
}
exports.SimpleNAT = SimpleNAT;
_a = JSII_RTTI_SYMBOL_1;
SimpleNAT[_a] = { fqn: "cdk-construct-simple-nat.SimpleNAT", version: "0.2.742" };
SimpleNAT.Ipv6Regex = '^s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:)))(%.+)?s*(/([0-9]|[1-9][0-9]|1[0-1][0-9]|12[0-8]))?$';
function routerTypeToPropName(routerType) {
switch (routerType) {
case aws_ec2_1.RouterType.EGRESS_ONLY_INTERNET_GATEWAY: return 'egressOnlyInternetGatewayId';
case aws_ec2_1.RouterType.GATEWAY: return 'gatewayId';
case aws_ec2_1.RouterType.INSTANCE: return 'instanceId';
case aws_ec2_1.RouterType.NAT_GATEWAY: return 'natGatewayId';
case aws_ec2_1.RouterType.NETWORK_INTERFACE: return 'networkInterfaceId';
case aws_ec2_1.RouterType.VPC_PEERING_CONNECTION: return 'vpcPeeringConnectionId';
default: throw new Error('Unsupported router type');
}
}
/**
* Preferential set
*
* Picks the value with the given key if available, otherwise distributes
* evenly among the available options.
*/
class PrefSet {
constructor() {
this.map = {};
this.vals = new Array();
this.next = 0;
}
add(pref, value) {
this.map[pref] = value;
this.vals.push([pref, value]);
}
pick(pref) {
if (this.vals.length === 0) {
throw new Error('Cannot pick, set is empty');
}
if (pref in this.map) {
return this.map[pref];
}
return this.vals[this.next++ % this.vals.length][1];
}
values() {
return this.vals;
}
}
//# 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eslint @typescript-eslint/no-require-imports: \"off\" */\nimport * as fs from 'fs';\nimport * as path from 'path';\nimport { Resource, RemovalPolicy, Duration, Tags, Annotations } from 'aws-cdk-lib';\nimport {\n  IVpc, SubnetSelection, Instance, InstanceClass, InstanceSize,\n  InstanceType, SubnetType, Peer, SecurityGroup, ISecurityGroup, Port,\n  CfnRoute, ISubnet, Subnet, RouterType, AddRouteOptions,\n  MachineImage, AmazonLinuxStorage, AmazonLinuxCpuType,\n  CfnNetworkInterface, CfnEIP, CfnEIPAssociation,\n  CloudFormationInit, InitConfig, InitFile, InitPackage, InitCommand, IMachineImage, OperatingSystemType,\n  KeyPair,\n} from 'aws-cdk-lib/aws-ec2';\nimport { ManagedPolicy, Role, ServicePrincipal, PolicyStatement, IRole } from 'aws-cdk-lib/aws-iam';\nimport { Construct } from 'constructs';\nimport * as Mustache from 'mustache';\nconst fetch = require('sync-fetch');\n\n/**\n * Properties for NAT instances\n */\nexport interface SimpleNATProps {\n  /**\n   * The VPC the NAT instances will reside\n   */\n  readonly vpc: IVpc;\n  /**\n   * The subnet selection for NAT instances, one NAT instance will be placed in the selected subnets.\n   *\n   * NOTE: must select the public subnet\n   *\n   * @default - subnetType is SubnetType.PUBLIC and onePerAZ is true.\n   */\n  readonly natSubnetsSelection?: SubnetSelection;\n  /**\n   * The subnet selection for updating route tables for selected subnets.\n   *\n   * @default - subnetType is SubnetType.PRIVATE_WITH_NAT.\n   */\n  readonly privateSubnetsSelection?: SubnetSelection;\n  /**\n   * The instance type of NAT instances\n   *\n   * @default - t3.MICRO.\n   */\n  readonly instanceType?: InstanceType;\n  /**\n   * The AMI of NAT instances\n   *\n   * @default - Amazon Linux 2 for x86_64.\n   */\n  readonly machineImage?: IMachineImage;\n  /**\n   * The key name of ssh key of NAT instances.\n   *\n   * @default - No SSH access will be possible.\n   */\n  readonly keyName?: string;\n  /**\n   * The custom script when provisioning the NAT instances.\n   *\n   * @default - no custom script.\n   */\n  readonly customScripts?: string;\n  /**\n   * The IAM role attached to NAT instances.\n   *\n   * @default - an IAM role is created.\n   */\n  readonly role?: IRole;\n}\n\ninterface NATInstance {\n  readonly instance: Instance;\n  readonly eni: CfnNetworkInterface;\n}\n\ninterface RouteStats {\n  ipv4: number;\n  ipv6: number;\n}\n\n/**\n * Properties for how adding IPs to route\n */\nexport interface RouteProps {\n  /**\n   * If excluding IPv6 when creating route\n   *\n   * @default - false\n   */\n  readonly excludeIPv6?: boolean;\n}\n\n/**\n * Simple NAT instances construct.\n */\nexport class SimpleNAT extends Resource {\n\n  static readonly Ipv6Regex = '^s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:)))(%.+)?s*(/([0-9]|[1-9][0-9]|1[0-1][0-9]|12[0-8]))?$';\n\n  private gateways: PrefSet<NATInstance> = new PrefSet<NATInstance>();\n  private _securityGroup: ISecurityGroup;\n  private _routeMappingSubnets: Map<string, Subnet[]>;\n  private _routeTablesLimit: Map<string, RouteStats> = new Map();\n\n  private readonly _defaultRoutesPerTable = 50;\n  private readonly _ipV6Regex = new RegExp(SimpleNAT.Ipv6Regex);\n\n  constructor(scope: Construct, id: string, props: SimpleNATProps) {\n    super(scope, id);\n\n    let subnets;\n    try {\n      subnets = props.vpc.selectSubnets(props.natSubnetsSelection ?? {\n        subnetType: SubnetType.PUBLIC,\n        onePerAz: true,\n      });\n    } catch (e) {\n      throw new Error('NAT instances must reside in public subnets.');\n    }\n\n    if (!subnets.hasPublic) {throw new Error('The custom NAT subnet selection MUST select PUBLIC subnets.');}\n\n    const machineImage = props.machineImage ?? MachineImage.latestAmazonLinux2({\n      storage: AmazonLinuxStorage.GENERAL_PURPOSE,\n      cpuType: AmazonLinuxCpuType.X86_64,\n    });\n\n    if (machineImage.getImage(this).osType != OperatingSystemType.LINUX) {throw new Error('The OS of custom AMI must be Linux.');}\n\n    this._securityGroup = new SecurityGroup(scope, 'NatSecurityGroup', {\n      vpc: props.vpc,\n      description: 'Security Group for NAT instances',\n      allowAllOutbound: true,\n    });\n    this._securityGroup.addIngressRule(Peer.ipv4(props.vpc.vpcCidrBlock), Port.allTraffic());\n\n    const role = props.role ?? new Role(scope, 'NatRole', {\n      assumedBy: new ServicePrincipal('ec2.amazonaws.com'),\n    });\n    role.addManagedPolicy(ManagedPolicy.fromAwsManagedPolicyName('AmazonSSMManagedInstanceCore'));\n    role.addToPrincipalPolicy(new PolicyStatement({\n      actions: [\n        'ec2:AttachNetworkInterface',\n        'ec2:DetachNetworkInterface',\n        'ec2:DescribeNetworkInterfaces',\n      ],\n      resources: ['*'],\n    }));\n\n    for (const sub of subnets.subnets) {\n\n      const eni = new CfnNetworkInterface(sub as Subnet, 'ENI1', {\n        subnetId: sub.subnetId,\n        sourceDestCheck: false,\n        description: 'ENI for binding EIP',\n        groupSet: [this._securityGroup.securityGroupId],\n      });\n      const eip = new CfnEIP(sub as Subnet, 'NatInstanceEIP', {\n        tags: [\n          {\n            key: 'Name',\n            value: `EIP for NAT instance in subnet '${sub.subnetId}'.`,\n          },\n        ],\n      });\n      eip.applyRemovalPolicy(RemovalPolicy.RETAIN);\n      new CfnEIPAssociation(sub as Subnet, 'EIPAssociation', {\n        allocationId: eip.attrAllocationId,\n        networkInterfaceId: eni.ref,\n      });\n\n      const configs = [\n        InitFile.fromFileInline('/opt/nat/snat.sh', path.join(__dirname, 'snat.sh'), {\n          mode: '000755',\n        }),\n        InitFile.fromFileInline('/etc/systemd/system/snat.service', path.join(__dirname, 'snat.service')),\n        InitFile.fromString('/opt/nat/runonce.sh',\n          Mustache.render(fs.readFileSync(path.join(__dirname, 'runonce.sh'), 'utf-8'), {\n            eniId: eni.ref,\n          }), {\n            mode: '000755',\n          }),\n        InitCommand.shellCommand('/opt/nat/runonce.sh'),\n      ];\n      if (props.customScripts) {\n        configs.push(InitFile.fromString('/opt/nat/custom.sh', props.customScripts, {\n          mode: '000755',\n        }));\n        configs.push(InitCommand.shellCommand('/opt/nat/custom.sh'));\n      }\n      const natInstance = new Instance(sub as Subnet, 'NatInstance', {\n        instanceType: props.instanceType ?? InstanceType.of(InstanceClass.T3, InstanceSize.MICRO),\n        machineImage,\n        vpc: props.vpc,\n        vpcSubnets: { subnets: [sub] },\n        securityGroup: this._securityGroup,\n        role,\n        keyPair: props.keyName ? KeyPair.fromKeyPairName(this, 'KeyPair', props.keyName) : undefined,\n        init: CloudFormationInit.fromConfigSets({\n          configSets: {\n            default: ['yumPreinstall', 'config'],\n          },\n          configs: {\n            yumPreinstall: new InitConfig([\n              // Install an Amazon Linux package using yum\n              InitPackage.yum('jq'),\n            ]),\n            config: new InitConfig(configs),\n          },\n        }),\n        initOptions: {\n          // Optional, which configsets to activate (['default'] by default)\n          configSets: ['default'],\n          timeout: Duration.minutes(5 + (props.customScripts ? 10 : 0)),\n        },\n      });\n\n      // NAT instance routes all traffic, both ways\n      this.gateways.add(sub.availabilityZone, {\n        instance: natInstance,\n        eni,\n      });\n    }\n\n    this._routeMappingSubnets = props.vpc.selectSubnets(props.privateSubnetsSelection ?? {\n      subnetType: SubnetType.PRIVATE_WITH_EGRESS,\n    }).subnets.reduce((routeMapping, sub) => {\n      if (routeMapping.has(sub.routeTable.routeTableId)) {\n        routeMapping.get(sub.routeTable.routeTableId).push(sub);\n      } else {\n        routeMapping.set(sub.routeTable.routeTableId, [sub]);\n      }\n      return routeMapping;\n    }, new Map());\n\n    Tags.of(this).add('construct', 'simple-nat');\n  }\n\n  public addV4Route(v4CIDR: string): this {\n    // Add routes to them in the private subnets\n    for (const [routeId, subnets] of this._routeMappingSubnets) {\n      this._configureSubnet(routeId, subnets, v4CIDR);\n    }\n    return this;\n  }\n\n  public addV6Route(v6CIDR: string): this {\n    // Add routes to them in the private subnets\n    for (const [routeId, subnets] of this._routeMappingSubnets) {\n      this._configureSubnet(routeId, subnets, undefined, v6CIDR);\n    }\n    return this;\n  }\n\n  /**\n   * Add Github IPs to route table\n   */\n  public withGithubRoute(props?: RouteProps): this {\n    const githubMeta = fetch('https://api.github.com/meta').json();\n    for (const cidr of githubMeta.git) {\n      for (const [routeId, subnets] of this._routeMappingSubnets) {\n        if (this._ipV6Regex.test(cidr)) {\n          const excludeIPv6 = props?.excludeIPv6 ?? false;\n          if (!excludeIPv6) {this._configureSubnet(routeId, subnets, undefined, cidr);}\n        } else {\n          this._configureSubnet(routeId, subnets, cidr);\n        }\n      }\n    }\n    return this;\n  }\n\n  /**\n   * Add Google IPs to route table\n   */\n  public withGoogleRoute(props?: RouteProps): this {\n    const googleMeta = fetch('https://www.gstatic.com/ipranges/goog.json').json();\n    const excludeIPv6 = props?.excludeIPv6 ?? false;\n    for (const cidr of googleMeta.prefixes) {\n      for (const [routeId, subnets] of this._routeMappingSubnets) {\n        if (cidr.ipv4Prefix) {this._configureSubnet(routeId, subnets, cidr.ipv4Prefix);}\n        if (cidr.ipv6Prefix && !excludeIPv6) {this._configureSubnet(routeId, subnets, undefined, cidr.ipv6Prefix);}\n      }\n    }\n    return this;\n  }\n\n  /**\n   * Add Cloudflare IPs to route table\n   *\n   * See https://www.cloudflare.com/ips/ for details\n   */\n  public withCloudflareRoute(props?: RouteProps): this {\n    const ipV4 = fetch('https://www.cloudflare.com/ips-v4').text().split(/\\r?\\n/);\n    for (const cidr of ipV4) {\n      for (const [routeId, subnets] of this._routeMappingSubnets) {\n        this._configureSubnet(routeId, subnets, cidr);\n      }\n    }\n    const excludeIPv6 = props?.excludeIPv6 ?? false;\n    if (!excludeIPv6) {\n      const ipV6 = fetch('https://www.cloudflare.com/ips-v6').text().split(/\\r?\\n/);\n      for (const cidr of ipV6) {\n        for (const [routeId, subnets] of this._routeMappingSubnets) {\n          this._configureSubnet(routeId, subnets, undefined, cidr);\n        }\n      }\n    }\n    return this;\n  }\n\n  private _configureSubnet(_routeId: string, subnets: Subnet[], v4CIDR?: string, v6CIDR?: string) : this {\n    const az = subnets[0].availabilityZone;\n    const natInstance = this.gateways.pick(az);\n    this._addRoute(`Route-${v4CIDR ? 'v4-' + v4CIDR?.replace(/[./]/gi, '-') : 'v6-' + v6CIDR?.replace(/[:/]/gi, '-')}`, subnets[0], {\n      destinationCidrBlock: v4CIDR,\n      destinationIpv6CidrBlock: v6CIDR,\n      routerType: RouterType.NETWORK_INTERFACE,\n      routerId: natInstance.eni.ref,\n      enablesInternetConnectivity: true,\n    });\n    return this;\n  }\n\n  private _addRoute(id: string, subnet: ISubnet, options: AddRouteOptions) {\n    if (options.destinationCidrBlock && options.destinationIpv6CidrBlock) {\n      throw new Error('Cannot specify both \\'destinationCidrBlock\\' and \\'destinationIpv6CidrBlock\\'');\n    }\n\n    new CfnRoute(subnet as Subnet, id, {\n      routeTableId: subnet.routeTable.routeTableId,\n      destinationCidrBlock: options.destinationCidrBlock ?? (options.destinationIpv6CidrBlock === undefined ? '0.0.0.0/0' : undefined),\n      destinationIpv6CidrBlock: options.destinationIpv6CidrBlock,\n      [routerTypeToPropName(options.routerType)]: options.routerId,\n    });\n\n    const isIpv4 = (options.destinationCidrBlock != undefined);\n    if (this._routeTablesLimit.has(subnet.routeTable.routeTableId)) {\n      const stats = this._routeTablesLimit.get(subnet.routeTable.routeTableId)!;\n      if (isIpv4) {stats.ipv4 += 1;} else {stats.ipv6 += 1;}\n\n      this._routeTablesLimit.set(subnet.routeTable.routeTableId, stats);\n      const totalRoutes = (isIpv4 ? stats.ipv4 : stats.ipv6);\n      if (totalRoutes > this._defaultRoutesPerTable) {Annotations.of(this).addWarning(`The current routes in route table '${subnet.routeTable.routeTableId}' is ${totalRoutes} which exceeds the default limit ${this._defaultRoutesPerTable}. You can open ticket to increase it.`);}\n    } else {\n      this._routeTablesLimit.set(subnet.routeTable.routeTableId, {\n        ipv4: isIpv4 ? 1 : 0,\n        ipv6: isIpv4 ? 0 : 1,\n      });\n    }\n  }\n}\n\nfunction routerTypeToPropName(routerType: RouterType) {\n  switch (routerType) {\n    case RouterType.EGRESS_ONLY_INTERNET_GATEWAY: return 'egressOnlyInternetGatewayId';\n    case RouterType.GATEWAY: return 'gatewayId';\n    case RouterType.INSTANCE: return 'instanceId';\n    case RouterType.NAT_GATEWAY: return 'natGatewayId';\n    case RouterType.NETWORK_INTERFACE: return 'networkInterfaceId';\n    case RouterType.VPC_PEERING_CONNECTION: return 'vpcPeeringConnectionId';\n    default: throw new Error('Unsupported router type');\n  }\n}\n\n/**\n * Preferential set\n *\n * Picks the value with the given key if available, otherwise distributes\n * evenly among the available options.\n */\nclass PrefSet<A> {\n  private readonly map: Record<string, A> = {};\n  private readonly vals = new Array<[string, A]>();\n  private next: number = 0;\n\n  public add(pref: string, value: A) {\n    this.map[pref] = value;\n    this.vals.push([pref, value]);\n  }\n\n  public pick(pref: string): A {\n    if (this.vals.length === 0) {\n      throw new Error('Cannot pick, set is empty');\n    }\n\n    if (pref in this.map) { return this.map[pref]; }\n    return this.vals[this.next++ % this.vals.length][1];\n  }\n\n  public values(): Array<[string, A]> {\n    return this.vals;\n  }\n}"]}