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service-deployer.ts
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service-deployer.ts
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/*
* Copyright (c) 2023 - Restate Software, Inc., Restate GmbH
*
* This file is part of the Restate SDK for Node.js/TypeScript,
* which is released under the MIT license.
*
* You can find a copy of the license in file LICENSE in the root
* directory of this repository or package, or at
* https://github.com/restatedev/sdk-typescript/blob/main/LICENSE
*/
import path from "node:path";
import { Construct } from "constructs";
import * as cdk from "aws-cdk-lib";
import * as cr from "aws-cdk-lib/custom-resources";
import * as iam from "aws-cdk-lib/aws-iam";
import * as lambda from "aws-cdk-lib/aws-lambda";
import * as lambda_node from "aws-cdk-lib/aws-lambda-nodejs";
import * as logs from "aws-cdk-lib/aws-logs";
import * as secrets from "aws-cdk-lib/aws-secretsmanager";
import { IRestateEnvironment } from "./restate-environment";
import { RegistrationProperties } from "./register-service-handler";
const DEFAULT_TIMEOUT = cdk.Duration.seconds(180);
/**
* This construct implements a custom CloudFormation resource provider that handles deploying Lambda-based service
* handlers with a Restate environment. It is used internally by the Cloud and self-hosted Restate environment
* constructs and not intended for direct use by end users of Restate.
*
* This functionality is implemented as a custom resource so that we are notified of any updates to service handler
* functions: by creating a CloudFormation component, we can model the dependency that any changes to the handlers need
* to be communicated to the registrar. Without this dependency, CloudFormation might perform an update deployment that
* triggered by a Lambda handler code or configuration change, and the Restate environment would be unaware of it.
*
* You can share the same deployer across multiple service registries provided the configuration options are compatible
* (e.g. the Restate environments it needs to communicate with for deployment are all accessible via the same VPC and
* Security Groups, accept the same authentication token, and so on).
*
* Deployment logs are retained for 30 days by default.
*/
export class ServiceDeployer extends Construct {
/** The custom resource provider for handling "deployment" resources. */
readonly deploymentResourceProvider: cr.Provider;
private invocationPolicy?: iam.Policy;
constructor(
scope: Construct,
id: string,
/**
* Allows the custom resource event handler properties to be overridden. The main use case for this is specifying
* VPC and security group settings for Restate environments that require it.
*/
props?: Pick<
lambda.FunctionOptions,
"functionName" | "logGroup" | "timeout" | "vpc" | "vpcSubnets" | "securityGroups"
> &
Pick<lambda_node.NodejsFunctionProps, "entry"> &
Pick<logs.LogGroupProps, "removalPolicy">,
) {
super(scope, id);
const eventHandler = new lambda_node.NodejsFunction(this, "EventHandler", {
functionName: props?.functionName,
logGroup: props?.logGroup,
description: "Restate custom registration handler",
entry: props?.entry ?? path.join(__dirname, "register-service-handler/index.js"),
architecture: lambda.Architecture.ARM_64,
runtime: lambda.Runtime.NODEJS_LATEST,
memorySize: 128,
timeout: props?.timeout ?? DEFAULT_TIMEOUT,
environment: {
NODE_OPTIONS: "--enable-source-maps",
},
bundling: {
minify: false,
sourceMap: true,
},
...(props?.vpc
? ({
vpc: props?.vpc,
vpcSubnets: props?.vpcSubnets,
securityGroups: props?.securityGroups,
} satisfies Pick<lambda.FunctionOptions, "vpc" | "vpcSubnets" | "securityGroups">)
: {}),
});
if (!props?.logGroup) {
// By default, Lambda Functions have a log group with never-expiring retention policy.
new logs.LogGroup(this, "DeploymentLogs", {
logGroupName: `/aws/lambda/${eventHandler.functionName}`,
retention: logs.RetentionDays.ONE_MONTH,
removalPolicy: cdk.RemovalPolicy.RETAIN_ON_UPDATE_OR_DELETE,
});
}
this.deploymentResourceProvider = new cr.Provider(this, "CustomResourceProvider", { onEventHandler: eventHandler });
}
/**
* Deploy a Lambda-backed Restate service to a given environment. This will register a deployment that will trigger
* a Restate registration whenever the handler resource changes.
*
* @param serviceName the service name within Restate - this must match the service's self-reported name during discovery
* @param handler service handler - must be a specific function version, use "latest" if you don't care about explicit versioning
* @param environment target Restate environment
* @param options additional options; see field documentation for details
*/
deployService(
serviceName: string,
handler: lambda.IVersion,
environment: IRestateEnvironment,
options?: {
/**
* Secrets Manager secret ARN for the authentication token to use when calling the admin API. Takes precedence
* over the environment's token.
*/
authToken?: secrets.ISecret;
/**
* Whether to skip granting the invoker role permission to invoke the service handler.
*/
skipInvokeFunctionGrant?: boolean;
/**
* Whether to mark the service as private, and make it unavailable to be called via Restate ingress.
* @see https://docs.restate.dev/operate/registration#private-services
*/
private?: boolean;
/**
* A dummy parameter to force CloudFormation to update the deployment when the configuration changes. Useful if
* you want to target the "latest version" of a service handler and need to force a deployment in order to trigger
* discovery.
*/
configurationVersion?: string;
/**
* Whether to accept self-signed certificates.
*/
insecure?: boolean;
},
) {
const authToken = options?.authToken ?? environment.authToken;
authToken?.grantRead(this.deploymentResourceProvider.onEventHandler);
const deployment = new cdk.CustomResource(handler, "RestateDeployment", {
serviceToken: this.deploymentResourceProvider.serviceToken,
resourceType: "Custom::RestateServiceDeployment",
properties: {
servicePath: serviceName,
adminUrl: environment.adminUrl,
authTokenSecretArn: authToken?.secretArn,
serviceLambdaArn: handler.functionArn,
invokeRoleArn: environment.invokerRole?.roleArn,
removalPolicy: cdk.RemovalPolicy.RETAIN,
private: (options?.private ?? false).toString() as "true" | "false",
configurationVersion: options?.configurationVersion,
insecure: (options?.insecure ?? false).toString() as "true" | "false",
} satisfies RegistrationProperties,
});
if (environment.invokerRole && !options?.skipInvokeFunctionGrant) {
// We create a separate policy which we'll attach to the provided invoker role. This breaks a circular cross-stack
// dependency that would otherwise be created between the service deployer and the invoker role.
if (!this.invocationPolicy) {
this.invocationPolicy = new iam.Policy(this, "InvocationPolicy");
// Despite the ARN reference above, CloudFormation sometimes tries to invoke the custom resource handler before
// all permissions are applied. Adding an explicit dependency includes a dependency on any pending policy updates
// defined in the same stack as the service deployer, which seems to help. Some propagation delay might still mean
// we lean on retries in the deployer event handler in any event but this reduces the probability of failure.
deployment.node.addDependency(this.invocationPolicy);
this.invocationPolicy.attachToRole(environment.invokerRole);
}
this.invocationPolicy.addStatements(
new iam.PolicyStatement({
actions: ["lambda:InvokeFunction"],
resources: handler.lambda.resourceArnsForGrantInvoke,
}),
);
}
}
}