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AWS: API, Dynamo and Lambda

Review, Research, and Discussion

What are serverless functions?

  • its a code that executed directly in cloud without thinking of maintaining servers.

If you were to create a system that emulated Lambda functions, how would you do it?

  • only you have to write your code inside handler function for Lambda either online or locally and then upload the code.
  • after that you have to trigger this Lambda function with other services to execute it.

Describe how a CDN works

  • it is a group of servers that connected togethor, but each one of them in defferent location.
  • when a user hit a request, then the nearest server to the user’s region will reponse to it.

Document the following Vocabulary Terms

Serverless Functions it’s a code that executed directly in cloud without thinking of maintaining servers.

Cloud Storage a service that allows you to save your static data online and use them when ever you want.

CDN Content delivery network, it is a group of servers that connected togethor, but each one of them in defferent location. when a user hit a request, then the nearest server to the user’s region will reponse to it.

Preparation Materials

AWS API Gateway Overview

  • Amazon API Gateway is a managed service that allows developers to define the HTTP endpoints of a REST API or a WebSocket API and connect those endpoints with the corresponding backend business logic. It also handles authentication, access control, monitoring, and tracing of API requests.

  • API Gateway mostly used with serverless functions to replace API servers.

  • it run Lambda functions to generate HTTP API responses.

  • it can publish SNS notifications when an HTTP API endpoint is accessed.

  • API Gateway provide authentication and authorization for your HTTP APIs.

advantages of using API Gateway AWS :

  • response to HTTP API requests.
  • response to WebSocket requests.
  • using AWS cognito that will check the authorization for your app, then no need to use your own auth.
  • using cloudWatch, X-Ray and another logging AWS services to simplify the debugging of your API requests.

dissadvantages of using API Gateway :

  • in some cases, response time will be slow.
  • Payload size : 10 MB
  • Integration timeouts : from 50 ms to 29 sec

  • Regional APIs : 600 regional API

  • but maybe you can enhance some of these limits if contacted the AWS support.

AWS API Gateway

  • Amazon API Gateway is a fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale.

AWS DynamoDB Guide

  • DynamoDB is a hosted NoSQL database offered by Amazon Web Services (AWS).

  • DynamoDB good for:

    • Applications with large amounts of data and strict latency requirements (up to 100 TBs)
    • Serverless applications using AWS Lambda
    • Data sets with simple, known access patterns

AWS DynamoDB

  • Amazon DynamoDB is a key-value and document database that delivers single-digit millisecond performance at any scale. It’s a fully managed, multi-region, multi-active, durable database with built-in security, backup and restore, and in-memory caching for internet-scale applications. DynamoDB can handle more than 10 trillion requests per day and can support peaks of more than 20 million requests per second.

  • very fast respone (in milli-seconds).
  • it can handle a huge amount of requests togother.

Dynamoose

  • Dynamoose is a modeling tool for Amazon’s DynamoDB. Dynamoose is heavily inspired by Mongoose, which means if you are coming from Mongoose the syntax will be very familar.

  • it is a package that we have to install on our terminals to control the AWS DynamoDB service to use NoSQl database.

  • installation command :

npm install dynamoose

## External resources :

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