Accessing Amazon DynamoDB Using Amazon API Gateway Service Proxy

Services Covered

  • dynamodb DynamoDB
  • api API Gateway

Lab description

Accessing Amazon DynamoDB Using Amazon API Gateway Service Proxy

Learning Objectives

Create a GET method to scan a DynamoDB table
Create a POST method to put items into a table
Deploy a REST API to stage

Lab date

26-12-2021

Prerequisites

AWS account

Lab steps

    1. Create a DynamoDB table with keys: id (string), author (string), title (string). Call ti Books.
    2. In API Gateway create a new API with /books path. Then create a method of type GET. Configure it accordingly with your region and execution role that allows dynamodb:PutItem and dynamodb:Scan as follows:
    3. On the next tab choose Integration Request then Mapping Templates. For the Request body passthrough setting, select When there are no templates defined. Click Add mapping template and in the resulting field above it, enter application/json. Enter the following JSON snippet, then click Save: 
      {"TableName": "Books"}

    4. Return back the Method Execution then click Integration Response, Select the arrow icon next to the 200 Method response status entry in the table. Below Mapping Templates click application/json. Paste in the following code, then click Save below: 
      #set($inputRoot = $input.path('

      C

  • Create a POST method for /books path. Integration type: Select AWS Service
    AWS Region: Select us-west-2
    AWS Service: Select DynamoDB
    HTTP method: Select POST
    Action Type: Ensure Use action name is selected
    Action: Enter PutItem
  • For the Request body passthrough setting, select When there are no templates defined. Click Add mapping template and in the resulting field above it, enter application/json, Enter the following JSON snippet 
    

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  • For the Integration Response choose Mapping Templates and click application/json. In the template editor, enter an empty set of curly braces {}.
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  • In the API Gateway console, click Actions: click Deploy API. Copy the Invoke URL at the top of the page and append /books to the end of the URL:

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Lab files


    

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Acknowledgements


By : LU Tags: