Cron Jobs for Serverless Lambda

Serverless Plugin for Scheduling Lambda Cron Jobs

This plugin enables you to schedule Lambda functions with a variety of cron job frequencies. It supports different stages (dev, test, production) with options for various timing intervals such as minutes, daily, weekly, and monthly schedules.

Note: This plugin is built specifically for the AWS provider.

Table of Contents

• Features
• Installation
• Schedule Configuration
  • Interval-Based Schedule
  • Daily Schedule
  • Weekly Schedule
  • Monthly Schedule
• Input Configuration
• Configuration Example
  • TypeScript Example
  • TypeScript Example
  • YAML Example

Features

• Configure schedules for Lambda functions across different stages.
• Flexible scheduling options:
  • interval: Schedule to run at intervals (minutes, hours, days).
  • daily: Specific time of the day.
  • weekly: Specific day of the week at a specific time.
  • monthly: Specific day of the month at a specific time.
• Pass custom input parameters to Lambda functions.

Installation

• First, add it to your project as a dev dependency:

• First, add it to your project as a dev dependency:

  • npm: npm i -D lambda-cron
  • pnpm: pnpm i -D lambda-cron
  • yarn: yarn add -D lambda-cron

• Include it in your plugins:

  plugins:
    - lambda-cron

Schedule Configuration

Interval-Based Schedule

You can schedule a Lambda function to run at specific intervals. For example, a job with the unit minutes will run every x minutes.

unit: required - Interval unit can be one of the following:

• days
• hours
• minutes

duration: required - Time interval after which the job will run again.

// The hello Lambda function will run every 2 minutes.
{
  custom: {
    'lambda-cron': {
      dev: {
        hello: {
          schedule: {
            type: 'interval',
            params: {
              unit: 'minutes',
              duration: 2,
            },
          },
        },
      },
    },
  },
}

# The hello Lambda function will run every 2 days.
custom:
  lambda-cron:
    dev:
      hello:
        schedule:
          type: interval
          params:
            unit: days
            duration: 2

Daily Schedule

With a daily schedule, you can run a job at a specific time of the day.

• hour: required - Hour of the day in 24-hour format.
• minute: optional - Minute of the hour (1-59). Defaults to 0 if not provided.

{
  schedule: {
    type: 'daily',
    params: {
      hour: <hour-of-the-day>, // required
      minute: <minute-of-the-hour>, // optional, defaults to 0
    },
  },
}

schedule:
  type: daily
  params:
    hour: <hour-of-the-day> # required
    minute: <minute-of-the-hour> # optional, defaults to 0

Weekly Schedule

With a weekly schedule, you can run a job on a specific day of the week at a specified time.

• day: required - The day of the week (e.g., sunday, monday).
• hour: optional - Hour of the day in 24-hour format (defaults to 0).
• minute: optional - Minute of the hour (defaults to 0).

schedule:
  type: weekly
  params:
    day: <day-of-the-week> # required
    hour: <hour-of-the-day> # optional, defaults to 0
    minute: <minute-of-the-hour> # optional, defaults to 0

Monthly Schedule

With a monthly schedule, you can run a job on a specific day of the month at a specified time.

• day: required - Day of the month (1-31).
• hour: optional - Hour of the day in 24-hour format (defaults to 0).
• minute: optional - Minute of the hour (defaults to 0).

schedule:
  type: monthly
  params:
    day: <day-of-the-month> # required
    hour: <hour-of-the-day> # optional, defaults to 0
    minute: <minute-of-the-hour> # optional, defaults to 0

Yearly Schedule

With a yearly schedule, you can run a job on a specific day of the year at a specified time.

• month: required - Month of the year (1-12).
• day: optional - Day of the month 1-31. (defaults to 1)
• hour: optional - Hour of the day in 24-hour format (defaults to 0).
• minute: optional - Minute of the hour (defaults to 0).

schedule:
  type: yearly
  params:
    month: <month-oof-the-year> # required
    day: <day-of-the-month> # optional, defaults to 1
    hour: <hour-of-the-day> # optional, defaults to 0
    minute: <minute-of-the-hour> # optional, defaults to 0

Configuration Example

Below is an example of how to configure the lambda-cron plugin for the dev stage:

TypeScript Example

{
  service: 'aws-serverless-typescript-project',
  frameworkVersion: '3',
  plugins: ['serverless-esbuild', 'lambda-cron'],
  provider: {
    name: 'aws',
  },
  functions: {
    hello,
    books
  },
  custom: {
    'lambda-cron': {
      dev: {
        books: {
          schedule: {
            type: 'interval',
            params: {
              unit: 'minute',
              duration: 2,
            },
          },
          input: {
            key: 'value',
          },
        },
      },
    },
  },
}

YAML Example

service: aws-serverless-typescript-project
frameworkVersion: '3'

plugins:
  - serverless-esbuild
  - lambda-cron

provider:
  name: aws
  runtime: nodejs20.x

custom:
  lambda-cron:
    dev:
      books:
        schedule:
          type: monthly
          params:
            day: 2
            hour: 2
            minute: 2
        input:
          key: value