AWS Serverless Architecture

with Lambda

Serverless Pattern

EVENT SOURCE

FUNCTION

SERVICES

NODE

PYTHON

JAVA

C#

STATE CHANGES

  - RESOURCES

  - DATA

ENDPOINT REQUESTS

Anatomy of a Lambda Function

'use strict';

// imports and dependencies

exports.handler = function (event, context) {
  context.done(null, "Hello World!");
};

Example - s3 PUT Event Object

{
  "Records": [
    {
      "eventVersion": "2.0",
      "eventTime": "1970-01-01T00:00:00.000Z",
      "requestParameters": {
        "sourceIPAddress": "127.0.0.1"
      },
      "s3": {
        "configurationId": "testConfigRule",
        "object": {
          "eTag": "0123456789abcdef0123456789abcdef",
          "sequencer": "0A1B2C3D4E5F678901",
          "key": "HappyFace.jpg",
          "size": 1024
        },
        "bucket": {
          "arn": bucketarn,
          "name": "sourcebucket",
          "ownerIdentity": {
            "principalId": "EXAMPLE"
          }
        },
        "s3SchemaVersion": "1.0"
      },
      "responseElements": {
        "x-amz-id-2": "EXAMPLE123/5678abcdefghijklambdaisawesome/mnopqrstuvwxyzABCDEFGH",
        "x-amz-request-id": "EXAMPLE123456789"
      },
      "awsRegion": "us-east-1",
      "eventName": "ObjectCreated:Put",
      "userIdentity": {
        "principalId": "EXAMPLE"
      },
      "eventSource": "aws:s3"
    }
  ]
}

Lambda Benefits

  • Simple Set-up
  • Low Learning-curve
  • Zero Administration
  • Easy Monitoring
  • Automatic Scaling
  • Only pay for use

AutoRenter on AWS

AutoRenter Spec

Auth

API

Compute

Database

API Gateway

Lambda

DynamoDB

Cognito

Serverless Architecture (with FaaS)

Client

What type of serverless architecture?

  • Nanoservices
  • Microservices
  • Monolith

Nanoservices

Microservices

Monolithic

Serverless Framework

npm i -g serverless
serverless create --template aws-nodejs
serverless deploy
serverless logs
serverless remove

Debugging

1. CloudWatch logs in the AWS console

2. CloudWatch logs from the AWS CLI

3. Third party logging software

eg Librato

sls logs -f hello -t

Unit Testing

// Use any unit testing framework

  • Zip and Upload, then Test
  • Command Line
  • Testing Frameworks (example)

Live Testing

CI/CD

Serverless Use Cases

Web Applications
Backends
Data Processing
Chatbots
Alexa
IT Automation

Contact

  • github: gwenf
  • twitter: gwen_faraday
  • email: gwenfaraday@gmail.com

Links

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