aws cdk lambda, appconfig typescript example please? - aws-cdk

Question

Can anyone provide or point at an AWS-CDK/typescript example provisioning an AWS AppConfig app/env/config consumed by a lambda please? Could not find anything meaningful online.

Answer 1

A little late to this party, If anyone is coming to this question, looking for a quick answer, here you go:
AppConfig Does Not Have Any Official L2 Constructs
This means that one has to work with L1 constructs currently vended here
This is ripe for someone authoring an L2/L3 construct (I am working on vending this custom construct soon - so keep an eye out on updates here).
This does not mean its hard to use AppConfig in CDK, its just that unlike L2/L3 constructs, we have to dig deeper into setting AppConfig up reading their documentation.
A Very Simple Example (YMMV)
Here is a custom construct I have to setup AppConfig:
import {
CfnApplication,
CfnConfigurationProfile,
CfnDeployment,
CfnDeploymentStrategy,
CfnEnvironment,
CfnHostedConfigurationVersion,
} from "aws-cdk-lib/aws-appconfig";
import { Construct } from "constructs";
// 1. https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_appconfig-readme.html - there are no L2 constructs for AppConfig.
// 2. https://docs.aws.amazon.com/appconfig/latest/userguide/appconfig-working.html- this the CDK code from this console setup guide.
export class AppConfig extends Construct {
constructor(scope: Construct, id: string) {
super(scope, id);
// create a new app config application.
const testAppConfigApp: CfnApplication = new CfnApplication(
this,
"TestAppConfigApp",
{
name: "TestAppConfigApp",
}
);
// you can customize this as per your needs.
const immediateDeploymentStrategy = new CfnDeploymentStrategy(
this,
"DeployStrategy",
{
name: "ImmediateDeployment",
deploymentDurationInMinutes: 0,
growthFactor: 100,
replicateTo: "NONE",
finalBakeTimeInMinutes: 0,
}
);
// setup an app config env
const appConfigEnv: CfnEnvironment = new CfnEnvironment(
this,
"AppConfigEnv",
{
applicationId: testAppConfigApp.ref,
// can be anything that makes sense for your use case.
name: "Production",
}
);
// setup config profile
const appConfigProfile: CfnConfigurationProfile = new CfnConfigurationProfile(
this,
"ConfigurationProfile",
{
name: "TestAppConfigProfile",
applicationId: testAppConfigApp.ref,
// we want AppConfig to manage the configuration profile, unless we need from SSM or S3.
locationUri: "hosted",
// This can also be "AWS.AppConfig.FeatureFlags"
type: "AWS.Freeform",
}
);
// Update AppConfig
const configVersion: CfnHostedConfigurationVersion = new CfnHostedConfigurationVersion(
this,
"HostedConfigurationVersion",
{
applicationId: testAppConfigApp.ref,
configurationProfileId: appConfigProfile.ref,
content: JSON.stringify({
someAppConfigResource: "SomeAppConfigResourceValue",
//... add more as needed.
}),
// https://www.rfc-editor.org/rfc/rfc9110.html#name-content-type
contentType: "application/json",
}
);
// Perform deployment.
new CfnDeployment(this, "Deployment", {
applicationId: testAppConfigApp.ref,
configurationProfileId: appConfigProfile.ref,
configurationVersion: configVersion.ref,
deploymentStrategyId: immediateDeploymentStrategy.ref,
environmentId: appConfigEnv.ref,
});
}
}
Here is what goes inside my lambda handler (please note that you should have lambda layers enabled for AppConfig extension, see more information here):
const http = require('http');
exports.handler = async (event) => {
const res = await new Promise((resolve, reject) => {
http.get(
"http://localhost:2772/applications/TestAppConfigApp/environments/Production/configurations/TestAppConfigProfile",
resolve
);
});
let configData = await new Promise((resolve, reject) => {
let data = '';
res.on('data', chunk => data += chunk);
res.on('error', err => reject(err));
res.on('end', () => resolve(data));
});
const parsedConfigData = JSON.parse(configData);
return parsedConfigData;
};
EDIT: As promised, I released a new npm library : https://www.npmjs.com/package/cdk-appconfig, as of this update, this is still pre-release, but time permitting I will release a 1.x soon. But this will allow people to check out/fork if need be. Please share feedback/or open PRs if you'd like to collaborate.

Answer 2

I have no experience with AWS AppConfig. But I would start here and here