Provision lambda concurrency in CDK

Question

I am trying to provision lambda concurrency via CDK. I have a couple of CfnFunctions and I need to provision them.

Provisioning can be done on aliases only. Hence, when I add autoPublishAlias to the CfnFunction, the APIG trigger does not work.

How can the provisioning be achieved (configured) via CDK?

Thanks, Vinod.

Answer 1

I think I got it:

Java code

package YOURPACKAGENAMEHERE;

import software.amazon.awscdk.core.Construct;
import software.amazon.awscdk.core.Stack;
import java.util.UUID;
import software.amazon.awscdk.core.Duration;
import software.amazon.awscdk.services.lambda.Alias;
import software.amazon.awscdk.services.lambda.AliasProps;
import software.amazon.awscdk.services.lambda.Code;
import software.amazon.awscdk.services.lambda.Function;
import software.amazon.awscdk.services.lambda.IFunction;
import software.amazon.awscdk.services.lambda.Runtime;
import software.amazon.awscdk.services.lambda.SingletonFunction;
import software.amazon.awscdk.services.lambda.Version;
import software.amazon.awscdk.services.lambda.VersionProps;
import software.amazon.awscdk.services.iam.Role;

public class JavacdexampleStack extends Stack {

    public JavacdexampleStack(final Construct scope, final String id) {
        super(scope, id);

        //create Lambda function
        SingletonFunction lambdaFunction =
        SingletonFunction.Builder.create(this, "cdk-lambda-example")
            .description("Lambda which prints \"I'm running\"")
            .code(Code.fromInline("def main(event, context):\n" + "    print(\"I'm running!\")\n"))
            .handler("index.main")
            .timeout(Duration.seconds(300))
            .runtime(Runtime.PYTHON_3_7)
            .uuid(UUID.randomUUID().toString())
            .role(Role.fromRoleArn(this, "roleId", "arn:aws:iam::111122223333:role/116CD745-C8DA-4569-8058-828EFA93E6D7"))//replace with your execution role or create one in cdk
            .build();

        IFunction lambda = Function.fromFunctionArn(this, "functionId", lambdaFunction.getFunctionArn());

        //create version for alias to be assigned to
        VersionProps versionprop = new VersionProps.Builder()
            .lambda(lambda)
        //assign version which the alias points to with provisioned concurrency
            .provisionedConcurrentExecutions(5)
            .build();

        Version version = new Version(this, "versionId", versionprop);

        //create alias
        AliasProps aliasprops = new AliasProps.Builder()
            .aliasName("YourAliasNameHere")
            .version(version)
            .build();
        Alias alias = new Alias(this,"aliasId", aliasprops);

    }
}

OUTPUT:

preliminary steps taken

# assumes npm and mvn are installed
Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
npm install -g aws-cdk
cdk --version
    # pasting here for visability on which version I used
    1.22.0 (build 309ac1b)

mkdir javacdkexample
cd javacdkexample 
cdk init --language java

# recommended to run after creating the project from docs
# https://docs.aws.amazon.com/cdk/latest/guide/getting_started.html#getting_started_update
mvn versions:use-latest-versions

pom.xml

<dependencies>
    <!-- AWS Cloud Development Kit -->
    <dependency>
        <groupId>software.amazon.awscdk</groupId>
        <artifactId>core</artifactId>
        <version>1.22.0</version>
    </dependency>

    <dependency>
        <groupId>software.amazon.awscdk</groupId>
        <artifactId>lambda</artifactId>
        <version>1.22.0</version>
    </dependency>

    <dependency>
        <groupId>software.amazon.awscdk</groupId>
        <artifactId>events-targets</artifactId>
        <version>1.22.0</version>
    </dependency>

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13</version>
        <scope>test</scope>
    </dependency>
</dependencies>