pmontu / jubilant-succotash

AWS Lambda Back end for storing and retrieving images from s3 and dynamodb

jubilant-succotash

AWS Lambda Back end for storing and retrieving images from s3 and dynamodb

AWS

Create User, Allocate Permissions and Generate Access Key and Secret

https://console.aws.amazon.com/iam/home

• Click Users
• Click Add User
• Enter User Name and check Access type - Programmatic access, then press Next
• Click Create Group
• Enter Group Name and Select AmazonS3FullAccess and AmazonDynamoDBFullAccess and Create Group
• Select the goup and Click Next
• Click Create User in Review Screen.
• Copy Access key ID and Secret access key(it wont be shown again)

CLI

mkdir ~/.aws
touch ~/.aws/credentials

replace access-key and secret in your favorite editor and paste contents in ~/.aws/credentials

[default]
aws_access_key_id = <access-key>
aws_secret_access_key = <secret>

pip install awscli

S3 Bucket

please replace bucket-name and region aws s3 mb s3://<bucket-name> --region <region>

DynamoDb Table

please replace table-name and region aws dynamodb create-table --table-name <table-name> --region <region> --attribute-definitions AttributeName=FileName,AttributeType=S --key-schema AttributeName=FileName,KeyType=HASH --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5

Info

• AWS Regions
• example region: us-east-2
• bucket name should be unique

SAM

install sam

pyenv shell 3.6.6
pip install --upgrade pip
xcode-select --install
pip install --user aws-sam-cli

download dependancies

sam init --runtime nodejs
cd jubilant-succotash
npm install

please copy Table Name, Bucket Name to template.yaml like below. (reference)

AWSTemplateFormatVersion : '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: My first serverless application.
Resources:
  Pictures:
    Type: AWS::Serverless::Function
    Properties:
      Handler: picture.handler
      Runtime: nodejs8.10
      ...
      Environment:
        Variables:
          TABLE_NAME: <table-name>
          BUCKET_NAME: <bucket-name>

start project on port 3000. please replace key and secret. sam local start-api

test the urls on terminal

curl -X GET \
  http://localhost:3000/picture

curl -X POST \
  http://localhost:3000/picture \
  -d '{
	"picture": "<base64-encoded-string-of-image>"
}'

Info

• use https://www.base64-image.de/ to convert images to base64

Known Issue

• Timeout is set to 30 seconds. change it to a higher value if required.