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This project demonstrate usage of Serverless framework for creating a CRUD Rest API using API gateway, Lambda and Dynamodb for persistence

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Project demonstrating usage of Serverless framework for creating a CRUD Rest API using API gateway REST API, Lambda with Node.js 12.x runtime and Dynamodb

Serverless framework provides consistent packaging and deployment experience across cloud providers. It provides an abstraction on top of cloud vendor settings and configurations. This makes it easier to focus on actual functions instead of cloud specific configurations, packaging and deployments. In this example instead of using raw cloudformation template to spin up complete stack we will use a serverless framework. Under the hood serverless uses cloudformation to spin up stack in AWS.

Just like raw cloudfrormation template serverless.yml takes care of spinning up a CloudFormation stack comprising of -

  • API Gateway REST API
  • DynamoDB Table
  • Lambda functions with Node.js 12.x runtime for CRUD operations on Account
  • IAM Roles and Policies

This example project can be used as template to jump start Serverless API development.

How to run?

Prerequisite : AWS account and AWS CLI

Install Serverless Framework -

npm install -g serverless

Initial setup -

serverless

After that create a package and cloudformation stack using following command

serverless deploy

Serverless: Packaging service...
Serverless: Excluding development dependencies...
Serverless: Creating Stack...
Serverless: Checking Stack create progress...
.....
Serverless: Stack create finished...
Serverless: Uploading CloudFormation file to S3...
Serverless: Uploading artifacts...
Serverless: Uploading service .zip file to S3 (6.31 MB)...
Serverless: Validating template...
Serverless: Updating Stack...
Serverless: Checking Stack update progress...
..................................................................................................................
Serverless: Stack update finished...
Service Information
service: serverless-api-lambda-dynamodb-example
stage: dev
region: us-west-2
stack: serverless-api-lambda-dynamodb-example-dev
api keys:
  None
endpoints:
  POST - https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts
  GET - https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts/{id+}
  GET - https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts
  PUT - https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts/{id+}
  DELETE - https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts/{id+}
  GET - https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/hello
functions:
  createAccount: serverless-api-lambda-dynamodb-example-dev-createAccount
  getAccount: serverless-api-lambda-dynamodb-example-dev-getAccount
  getAccounts: serverless-api-lambda-dynamodb-example-dev-getAccounts
  updateAccounts: serverless-api-lambda-dynamodb-example-dev-updateAccounts
  deleteAccount: serverless-api-lambda-dynamodb-example-dev-deleteAccount
  helloWorld: serverless-api-lambda-dynamodb-example-dev-helloWorld

Test

Test the endpoints using following curl commands

Create Account -

curl -i -X POST \                                                                            
  https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts \
  -H 'content-type: application/json' \
  -d '{
        "name":"Foo",
        "iban":"NL25ABNA0435472492"
}'

HTTP/2 201 
content-type: application/json
content-length: 128
date: Mon, 21 May 2018 19:37:38 GMT
x-amzn-requestid: 6ac40494-5d2e-11e8-8b67-718f823c1ffb
x-amz-apigw-id: HQHwPFayPHcFccQ=
x-amzn-trace-id: Root=1-5b032001-f509e6d2538974637bc5ebae
x-cache: Miss from cloudfront
via: 1.1 a459bf9dec7bba4e0a329e8ab2ebd928.cloudfront.net (CloudFront)
x-amz-cf-id: kL3IMgzi4EwmRdQOCZ7fJUyaJKv8fqF3Xju-0MaJes6UgKTwwO0YIw==

{"id":"6b480180-5d2e-11e8-9275-39f4e1e8b11f","name":"Foo","iban":"NL25ABNA0435472492","createdAt":1526931458456,"updatedAt":1526931458456}

Get Account -

curl -i -X GET \ 
  https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts/6b480180-5d2e-11e8-9275-39f4e1e8b11f
  
HTTP/2 200 
content-type: application/json
content-length: 128
date: Mon, 21 May 2018 19:42:33 GMT
x-amzn-requestid: 1a7b8a28-5d2f-11e8-ace2-3932708348fd
x-amz-apigw-id: HQIeTGmXvHcF5wg=
x-amzn-trace-id: Root=1-5b032128-bbcf64f5c4982abd6f346b31
x-cache: Miss from cloudfront
via: 1.1 9ece10f886f26459a29d505f7dc15d23.cloudfront.net (CloudFront)
x-amz-cf-id: iNDcWZXuJHr02GStW0rUpS9Qrjnq_SI_MV_pmFgWDYKGq_Ygk1J7eg==

{"id":"6b480180-5d2e-11e8-9275-39f4e1e8b11f","name":"Foo","iban":"NL25ABNA0435472492","createdAt":1526931458456,"updatedAt":1526931458456}

Update Account -

curl -i -X PUT \ 
  https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts/6b480180-5d2e-11e8-9275-39f4e1e8b11f \
  -H 'content-type: application/json' \
  -d '{
        "name":"Bar",
        "iban":"NL25ABNA0435472492"
}'

HTTP/2 200 
content-type: application/json
content-length: 0
date: Mon, 21 May 2018 19:43:20 GMT
x-amzn-requestid: 36d8e4cc-5d2f-11e8-bdd8-83a00846daaf
x-amz-apigw-id: HQIlvGWuvHcFZ0A=
x-amzn-trace-id: Root=1-5b032157-fa9d45eda83d906634f26893
x-cache: Miss from cloudfront
via: 1.1 ce2b03db99d40501c5695fce9dfbb777.cloudfront.net (CloudFront)
x-amz-cf-id: VGNK0CozL3ipCbGWxsrGZjmArmt_pF9FmOutyCPpwbEp8I0h5uYKIQ==

Get Accounts -

curl -i -X GET \
  https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts                                      

HTTP/2 200
content-type: application/json
content-length: 130
date: Mon, 21 May 2018 19:44:46 GMT
x-amzn-requestid: 69a5f4e4-5d2f-11e8-9194-b13541233785
x-amz-apigw-id: HQIzEHgCPHcFbIQ=
x-amzn-trace-id: Root=1-5b0321ad-c1cc417235030daa049d978f
x-cache: Miss from cloudfront
via: 1.1 4edcf55d6938e557aa2c6e71997d17b4.cloudfront.net (CloudFront)
x-amz-cf-id: XfB58gtI2DtRyWp2c5Qxk3bXg8ympTJyv3MaEH1BN_y8pCDOxs588Q==

[{"iban":"NL25ABNA0435472492","createdAt":1526931458456,"id":"6b480180-5d2e-11e8-9275-39f4e1e8b11f","name":"Bar","updatedAt":1526931800589}]

Delete Account -

curl -i -X DELETE \
  https://e5atxwgxtk.execute-api.us-west-2.amazonaws.com/dev/accounts/6b480180-5d2e-11e8-9275-39f4e1e8b11f
 
HTTP/2 200 
content-type: application/json
content-length: 0
date: Mon, 21 May 2018 19:45:35 GMT
x-amzn-requestid: 87718603-5d2f-11e8-8513-ffa125d6edb3
x-amz-apigw-id: HQI64FymvHcFwWw=
x-amzn-trace-id: Root=1-5b0321df-b021dddac58e20662121f796
x-cache: Miss from cloudfront
via: 1.1 c035b03e455c334ee837503784ad41c8.cloudfront.net (CloudFront)
x-amz-cf-id: KX1uEWob2gImG_KZVQzJZm1mi0lKHM5Aa0c5NvtvJi-rl9jOGxh4tg==

Finally you can delete the stack using following command -

serverless remove
         
Serverless: Getting all objects in S3 bucket...
Serverless: Removing objects in S3 bucket...
Serverless: Removing Stack...
Serverless: Checking Stack removal progress...
......................................................................
Serverless: Stack removal finished...

Thanks to offline plugins for serverless and DynamoDB, it's also possible to deploy and test API locally. For local deployment first we need to install DynamoDB using following command -

serverless dynamodb install

After that fire up local API using following command -

serverless offline start

Dynamodb Local Started, Visit: http://localhost:8000/shell
Serverless: DynamoDB - created table Account-dev
Serverless: Starting Offline: dev/us-west-2.

Serverless: Routes for createAccount:
Serverless: POST /accounts

Serverless: Routes for getAccount:
Serverless: GET /accounts/{id*}

Serverless: Routes for getAccounts:
Serverless: GET /accounts

Serverless: Routes for updateAccounts:
Serverless: PUT /accounts/{id*}

Serverless: Routes for deleteAccount:
Serverless: DELETE /accounts/{id*}

Serverless: Routes for helloWorld:
Serverless: GET /hello

Serverless: Offline listening on http://localhost:3000

As evident from console logs it spins up local DynamoDB. It is accessible via Web Shell at http://localhost:8000/shell You can test local API using above curl commands. Just swap API url with local one.

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This project demonstrate usage of Serverless framework for creating a CRUD Rest API using API gateway, Lambda and Dynamodb for persistence

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