Introduction
Hemanth of Alliance Department here. In this blog, I tried creating a calculator lambda function by integrating AWS API Gateway and Lambda.
AWS Lambda
A serverless compute service that runs code as a reply to events and automatically takes care of the bottom resources. It runs code on high availability compute infrastructure and performs all the administration of the compute resources. A few examples are HTTP requests vis Amazon API Gateway, changes to objects in S3, and many others.
API Gateway
A fully managed service that makes developers easily create, publish, maintain, monitor, and secure APIs at any scale. Using API Gateway can create Restful APIs and WebSocket APIs which have real-time two-way communication applications. It is a front door for applications to access data, business logic, or functionality from your backend services.
Demo
Go to Lambda and click on create function
Give a function name, keep other settings as default and click on create function
Make the following changes in the code
Configuring a test event
Now deploy the lambda
Now testing it
The numbers get added up and it's working as expected
Now open the API gateway and click on build RestAPI
click on new api, give an API name and click on create API
Now click on slash next actions and then resource
Make following changes and click on resource
select name, actions and select create method
select get and make the following changes
select the integration request
Make the following change and click save
Now deploying the API
Select new stage and click deploy
select the root, click action and select create resource
give a resource name and click create resource
select the above created resource and click on create resource
Make following changes and click on create method
Now creating method of type POST for the above resource, selecting the created lambda function and click save
click on integration request
if you scroll down then you can create a mapping template now start creating a mapping template
Making the following changes in the mapping templates and click save
Now testing it
After clicking on test, we get output as expected
Conclusion
Hope with this you get an idea of how to create a calculator lambda function by integrating AWS API Gateway and Lambda. Thank you for seeing the blog till the end.
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