Invoke AWS Lambda function only once, at a single specified future time

Question

I want to be able to set a time to invoke an AWS Lambda function, then have that function be invoked then and only then. For example, I want my Lambda function to run at 9:0

Answer 1

You can schedule a step function which can wait until a specific point in time before invoking the lambda with an arbitrary payload.

https://docs.aws.amazon.com/step-functions/latest/dg/amazon-states-language-wait-state.html

Something like this

const stepFunctions = new AWS.StepFunctions()
const payload = {
    stateMachineArn: process.env.SCHEDULED_LAMBDA_SF_ARN,
    name: `${base64.encode(email)}-${base64.encode(timestamp)}`, // Dedupe key
    input: JSON.stringify({
      timestamp,
      lambdaName: 'myLambdaName',
      lambdaPayload: {
        email,
        initiatedBy
      },
    }),
  }
await stepFunctions.startExecution(payload).promise()