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Local development with SAM

This method allows you to iterate very quickly against Lambda code without having to run AWS resources locally.

Requirements

• AWS CLI
• SAM CLI

Step 1: Create and deploy a simple SAM Template (see template.yaml)

• must include the environment varibales on the Lambda to pass the SAMPLE_TABLE in (see line 17)
• use sam deploy --guided for the first time deploy

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AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: HTTP API test
Globals:
  Function:
    Timeout: 3

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function

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const isLocal = process.env.AWS_SAM_LOCAL;

const handlerModel = (body, headers, code) => {
    let response = {
        'statusCode': code,
        'body': JSON.stringify(body)
    }

    if(headers.length > 0) {
        response.headers = response.headers || {};

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TranslateFunction:
  Type: AWS::Serverless::Function
  Properties:
    CodeUri: translate/
    Timeout: 10
    Handler: app.lambdaHandler
    Runtime: nodejs10.x
    Events:
      TranslateEvent:
        Type: CloudWatchEvent

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## Manage your Lambda layer in SAM
## This creates a layer and the permissions for the layer. This particular permission opens it to the world.
## I then use 'sam package' and 'sam deploy' to create/update the layer

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Lambda Layer

Resources:
  MyLayer:

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module.exports = {
  devServer: {
    disableHostCheck: true,
    public: 'https://[your cloud9 host id].vfs.cloud9.[region].amazonaws.com'
  }
}

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const http = require('http');

const hostname = '0.0.0.0';
const port = process.env.PORT || 3000;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World\n');
});

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AWSTemplateFormatVersion: "2010-09-09"
Description: AWS S3 Hosting bucket and CloudFront Distrobution

Resources:
  ## Origin Access ID for CloudFront
  HostAccessIdentity:
    Type: "AWS::CloudFront::CloudFrontOriginAccessIdentity"
    Properties:
      CloudFrontOriginAccessIdentityConfig:
        Comment: MyHostBucketId

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const AWS = require('aws-sdk');
const rds = new AWS.RDS();
const sns = new AWS.SNS();
const prefix = `snapper-${process.env.TIME_TO_LIVE}-${process.env.TIME_TO_LIVE_METRIC}-${process.env.CLUSTER_ID}`

const createClusterSnapshot = () => {
    let params = {
        DBClusterIdentifier: process.env.CLUSTER_ID,
        DBClusterSnapshotIdentifier: `${prefix}-${Date.now()}`,
        Tags: [{ Key: 'type', Value: 'snapper' }]

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AWSTemplateFormatVersion: '2010-09-09'
Description: Cognito Stack
Parameters:
  AuthName:
    Type: String
    Description: Unique Auth Name for Cognito Resources

Resources:
  # Creates a role that allows Cognito to send SNS messages
  SNSRole: