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The latest approach of the best architects is to utilize a new AWS service that explicitly replaces the need for a dedicated API Server. AWS API Gateway provides the ability to act as an interface between application and database which uses AWS Lambda function as the backend.<\/p>\n
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<\/p>\n To get the essence of AWS API Gateway, we need to get hands-on with it. The next part of the blog is a detailed tutorial on how to use AWS API Gateway along with AWS Lambda & DynamoDB.<\/p>\n People who are familiar with DynamoDB, API Gateway and Lambda can proceed with the high-level instructions. Also for people who are new to these services, there are detailed instructions which can be followed for step-by-step guidance.<\/p>\n The first step will be to create a DynamoDB table which stores the data. Next\u00a0a Lambda function which inserts the data into DynamoDB table. An\u00a0API Gateway is setup to trigger the Lambda function. Finally a REST Client will be used to call the API.<\/p>\n Create a DynamoDB table named <\/span>Employee<\/b> with the attributes of primary key as <\/span>emp_id<\/b>. Accept the rest of attributes as default and review the table details.<\/span><\/p>\n <\/p>\n [showhide type=”dynamodb”\u00a0more_text=”For Detailed Instructions..” less_text=”Hide Details” hidden=”yes”]<\/p>\n [\/showhide]<\/p>\n <\/p>\n <\/p>\n <\/p>\n Create a node.js Lambda function called <\/span>addEmployee<\/b>. Use code from the following location, <\/span>https:\/\/s3-ap-southeast-1.amazonaws.com\/cloudthatcode\/addEmployee.zip<\/span><\/a>. Replace IAM access and secret keys of a user with access to write into the DynamoDB table.<\/span><\/p>\n <\/p>\n [showhide type=”lambda”\u00a0more_text=”For Detailed Instructions..” less_text=”Hide Details” hidden=”yes”]<\/p>\n [\/showhide]<\/p>\n <\/p>\n <\/p>\n Next create an API called <\/span>Employee_API,<\/b>\u00a0a resource called <\/span>employee<\/b> and create a <\/span>POST <\/b>Method. Use Lambda as the integration type and select the Lambda function you created earlier. <\/span><\/p>\n Test the API with the following values from the console. <\/span><\/p>\n <\/p>\n <\/p>\n You should see the entries in the DynamoDB table.<\/span><\/p>\n For creating an API we need to create Resource, create POST method under the resource and utilize the Lambda function as integration type and the Deployment of API is up for launch.<\/span><\/p>\n <\/p>\n [showhide type=”apigateway”\u00a0more_text=”For Detailed Instructions..” less_text=”Hide Details” hidden=”yes”]<\/p>\n For creating API we will Create Resource, create POST method under the resource and we will provide the Lambda function as integration type and then we will Deploy the API.<\/p>\n [\/showhide]<\/p>\n <\/p>\n <\/p>\n Test the API setup. For this Install a REST client. There are extensions for Mozilla firefox and Chrome which can be used which can be use to make REST calls. Install the one specific to your Browser. Invoke the API URL with the following values<\/span><\/p>\n <\/p>\n <\/p>\n Check the DynamoDB table again for the entries.<\/span><\/p>\n The response from the DynamoDB is processed by the Lambda function and routed via the API Gateway. <\/span><\/p>\n [showhide type=”restclient”\u00a0more_text=”For Detailed Instructions..” less_text=”Hide Details” hidden=”yes”]<\/p>\n [\/showhide]<\/p>\n <\/p>\n With minimal effort a REST API has been created which accepts data, \u00a0which in turn gets processed by Lambda function and finally stored in a DynamoDB table. This API is ready for use and can be used in any application.<\/p>\n The API gateway frees the developer from maintaining infrastructure for APIs.\u00a0On the whole AWS API Gateway is a beneficial package for the developer. The API gateway provides nifty features where we can create different stages for development. It also has a useful testing platform which can be used to test the calls. It also provides caching and monitoring.<\/p>\n In my next blog <\/a><\/strong>I have talked about securing your API’s in API gateway, passing Query string & headers, transforming response type and returning the custom error code.The hands on is included. If you have any queries on API gateway or you have trouble getting it setup, feel free to drop a question into the comment section below or you can also ask the questions to https:\/\/forum.cloudthat.com<\/a><\/p>\n Thank you.<\/p>\n <\/p>\n <\/p>\n","protected":false},"author":219,"featured_media":0,"parent":0,"comment_status":"open","ping_status":"open","template":"","blog_category":[3804,3606,3607,3665],"user_email":"prarthitm@cloudthat.com","published_by":"324","primary-authors":"","secondary-authors":"","acf":[],"_links":{"self":[{"href":"https:\/\/www.cloudthat.com\/resources\/wp-json\/wp\/v2\/blog\/3157"}],"collection":[{"href":"https:\/\/www.cloudthat.com\/resources\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.cloudthat.com\/resources\/wp-json\/wp\/v2\/types\/blog"}],"author":[{"embeddable":true,"href":"https:\/\/www.cloudthat.com\/resources\/wp-json\/wp\/v2\/users\/219"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cloudthat.com\/resources\/wp-json\/wp\/v2\/comments?post=3157"}],"version-history":[{"count":2,"href":"https:\/\/www.cloudthat.com\/resources\/wp-json\/wp\/v2\/blog\/3157\/revisions"}],"predecessor-version":[{"id":41145,"href":"https:\/\/www.cloudthat.com\/resources\/wp-json\/wp\/v2\/blog\/3157\/revisions\/41145"}],"wp:attachment":[{"href":"https:\/\/www.cloudthat.com\/resources\/wp-json\/wp\/v2\/media?parent=3157"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.cloudthat.com\/resources\/wp-json\/wp\/v2\/blog_category?post=3157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/a><\/p>\nStep 1: Create a DynamoDB table:<\/strong><\/h2>\n
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<\/a><\/li>\n<\/ul>\n<\/li>\n<\/a><\/li>\n<\/a><\/li>\n<\/ol>\nStep 2: Create a Lambda Function:<\/strong><\/h2>\n
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<\/a><\/li>\n<\/ul>\n<\/li>\n<\/a><\/li>\n<\/ol>\nStep 3: Create an API in API Gateway :<\/strong><\/h2>\n
<\/a><\/p>\n{\r\n\r\n\u201cemp_id\u201d : \u201c2\u201d\r\n\r\n\u201cemp_Name\u201d : \u201cSnow\u201d\r\n\r\n\u201cemp_Salary\u201d : \u201c200000\u201d\r\n\r\n}<\/pre>\n\n
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<\/a><\/li>\n<\/ul>\n<\/li>\n<\/a><\/li>\n<\/ol>\nStep 4: Call the API using REST Client<\/strong><\/h2>\n
<\/a><\/p>\n{\r\n\r\n\u201cemp_id\u201d : \u201c3\u201d\r\n\r\n\u201cemp_Name\u201d : \u201cJack\u201d\r\n\r\n\u201cemp_Salary\u201d : \u201c200000\u201d\r\n\r\n}<\/pre>\n\n
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