如何使用 AWS CDK 为带有别名的 Lambda 设置 EventBridge 规则目标

Question

In my Lambda CDK stack, I want to setup an event rule to send an event to my Lambda every 10 minutes.

• aws-events Rule
• aws-events RuleProps
• aws-events-targets LambdaFunction

This works and deploys the rule with the lambda as the target

    // ... setup lambdaFunction construct...
    // -- EVENTBRIDGE RULES --

    const meetingSyncEvent = {
        path: "/v1/meeting/sync",
        httpMethod: "GET"
    };

    const eventTarget = new awsEventTarget.LambdaFunction(lambdaFunction, {
        event: awsEvents.RuleTargetInput.fromObject(meetingSyncEvent)
    });



    /**
     TODO how do I add target to ARN with alias/version
     * */

    const eventRule = new awsEvents.Rule(this, generateConstructName("event-rule"), {
        enabled: true,
        description: "event to invoke GET /meeting/sync",
        ruleName: "meeting-sync-rule",
        targets : [
             eventTarget
        ],
        schedule: awsEvents.Schedule.rate(EVENT_MEETING_SYNC_RATE)
    });


    // -- end EVENTBRIDGE RULES --

The problem is this only targets the base ARN without an Alias or version (effectively always pointing to $Latest). There is this option in AWS console to set an Alias or version for a target (pics below), how can I do this in the CDK?

aws console UI allows alias and version for target target arn has alias when configured through UI

Answer 1

I found it: the event rule takes type IFunction , and since IAlias and IVersion both extend IFunction , so we can take the alias we created for our function, and provide the alias as the function param (AWS differentiates between functions, alias-functions, and version-functions)

        const lambdaAlias =  lambdaFunction.latestVersion
                                           .addAlias(ENVIRONMENT_UPPERCASE)


        const eventTarget = new awsEventsTargets.LambdaFunction(lambdaAlias, {
            event: awsEvents.RuleTargetInput.fromObject(meetingSyncEvent)
        });

        const eventRule = new awsEvents.Rule(this, "event-rule", {
            enabled: true,
            description: `event to invoke GET /meeting/sync for ${FUNCTION_NAME}`,
            ruleName: `${FUNCTION_NAME}-invoke-meetingsync`,
            targets: [
                eventTarget
            ],
            schedule: awsEvents.Schedule.rate(EVENT_MEETING_SYNC_RATE)
        });