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Lambda Scheduling & Event Filtering with EventBridge using Serverless Framework
Lambda Scheduling & Event Filtering with EventBridge using Serverless Framework
Application Stack:
- Serverless Framework
- AWS EventBridge
- AWS Lambda
- NodeJs
In this post, We will take a look at a use-case that allows us to schedule lambda function call and custom event pattern matching based lambda function call with EventBridge using Serverless Framework.
AWS Architecture:
Above is an AWS Serverless architecture diagram showing EventBridge calling Lambda, using scheduled rules, and filtering lambda calls using custom even pattern matching rules.
1. Install Serverless Framework
npm install -g serverless
2. Create basic NodeJs type template project using Serverless Framework
serverless create --template aws-nodejs
By default it will generate a folder structure like this:
- handler.js
- serverless.yml
Default serverless.yml will have below IaC code:
service: default-aws-nodejs
frameworkVersion: '2'
provider:
name: aws
runtime: nodejs12.x
lambdaHashingVersion: 20201221
functions:
hello:
handler: handler.hello
Default handler.js will have below NodeJs code:
'use strict';
module.exports.hello = async (event) => {
return {
statusCode: 200,
body: JSON.stringify(
{
message: 'Go Serverless v1.0! Your function executed successfully!',
input: event,
},
null,
2
),
};
};
- Modify serverless.yml Infrastructure as code to provision needful Lambda functions with EventBridge as Event Source
service: sls-eventbridge
frameworkVersion: '2'
provider:
name: aws
runtime: nodejs12.x
lambdaHashingVersion: 20201221
stage: dev
region: ap-south-1
functions:
scheduledService:
handler: handler.scheduledService
events:
- schedule: rate(1 minute)
invoiceService:
handler: handler.invoiceService
events:
- cloudwatchEvent:
event:
detail:
operation:
- invoice-service
rewardService:
handler: handler.rewardService
events:
- cloudwatchEvent:
event:
detail:
operation:
- reward-service
- Modify handler.js with below sample demo code
'use strict';
const scheduledService = async (event) => {
console.log(event);
return {
statusCode: 200,
body: JSON.stringify(
{
message: 'scheduledService lambda function call through EventBridge scheduling rule!',
input: event,
},
null,
2
),
};
};
const invoiceService = async (event) => {
console.log(event);
return {
statusCode: 200,
body: JSON.stringify(
{
message: 'invoiceService lambda function call through EventBridge custom pattern matching!',
input: event,
},
null,
2
),
};
};
const rewardService = async (event) => {
console.log(event);
return {
statusCode: 200,
body: JSON.stringify(
{
message: 'rewardService lambda function call through EventBridge custom pattern matching!',
input: event,
},
null,
2
),
};
};
module.exports = {
scheduledService,
invoiceService,
rewardService
};
- Create AWS IAM user with programmatic access and give needful permission that allows Serverless Framework to provision resources
The Serverless Framework needs access to your cloud provider account so that it can create and manage resources on your behalf.
During Creating AWS IAM user copy API Key & Secret.
6. Configure AWS Credentials for Serverless Framework Deployment
serverless config credentials --provider aws --key xxxxx --secret xxxxx
- Deploy using Serverless Framework
serverless deploy
> serverless deploy
Serverless: Packaging service...
Serverless: Excluding development dependencies...
Serverless: Service files not changed. Skipping deployment...
Service Information
service: sls-eventbridge
stage: dev
region: ap-south-1
stack: sls-eventbridge-dev
resources: 18
api keys:
None
endpoints:
None
functions:
scheduledService: sls-eventbridge-dev-scheduledService
invoiceService: sls-eventbridge-dev-invoiceService
rewardService: sls-eventbridge-dev-rewardService
layers:
None
- Amazon EventBridge and AWS Lambda Screenshots
AWS Lambda Functions List
AWS Lambda Functions Event Source Configuration
Amazon EventBridge Default Bus Scheduling Rules
Amazon EventBridge Default Bus Custom Event Pattern Rule
Amazon EventBridge Default Bus Custom Event Pattern Rule
9. Remove already provisioned resources
serverless remove
Relevant Resources Link
- Serverless Framework: https://www.serverless.com/
- AWS EventBridge: https://aws.amazon.com/eventbridge/
- AWS Lambda: https://aws.amazon.com/lambda/
- NodeJs: https://nodejs.org/