Serverless Posts

Accessing a MongoDB instance from AWS Lambda using Python

  • by Emre Yilmaz
  • Jun 8, 2018
  • AWS, Serverless, Python
Accessing MongoDB from AWS Lambda using Python

In recent days, I made some trials for connecting to MongoDB databases from AWS Lambda functions using Python. In today’s post I will share my experiences with you and take some notes about these trials for future reference. We will install MongoDB on an EC2 instance and develop simple Python functions to access it. Let’s start! ... read more

Sending SMS Messages with Amazon SNS, AWS Lambda and Python

  • by Emre Yilmaz
  • May 23, 2018
  • AWS, Serverless, Python

Did you know that you can send SMS messages easily with Amazon SNS without subscribing any phone numbers to a topic? Let’s say that you have verified phone numbers and you would like to send text messages to them assuming that they opted in for this. Besides, you would like to pay only when you send. You can use Amazon SNS SDK for Python and automate this process using AWS Lambda. ... read more

Triggering AWS Step Functions by AWS API Gateway Calls

  • by Emre Yilmaz
  • May 8, 2018
  • AWS, Serverless

If you recall, in a previous blog post I discussed AWS Step Functions as a great service for orchestrating your AWS Lambda functions by giving an example. Today, I will show you how you can integrate your API Gateway resource methods with your AWS Step Functions state machines so that you can trigger your state machines with API calls.

Actually the benefits are obvious. Instead of serving our Lambda functions as separate endpoints and orchestrating which one to call and when in our front end; we can use a single endpoint and pass all logic to the back end. Then our back end, in this case our state machine, will execute the functions in sequential or parallel. This method especially suits well to cases when all these function calls are necessary to complete a single business action.

... read more

An Introduction to Amazon Cognito User Pools

  • by Emre Yilmaz
  • Feb 7, 2018
  • AWS, Serverless

When you build a new application, developing a secure, scalable user pool and authorization mechanism is a necessity and it takes time and effort to build. Sometimes, it even delays the development of the core features of your application that will bring the actual value to your business.

Amazon Cognito provides a scalable and secure user pool that you can create and use in your mobile and web applications. It provides a hosted user interface and SDKs for sign in and sign up actions. It has many features such as sending verification emails, SMS messages to your users. In this blog post, I will discuss how you can create an Amazon Cognito User Pool to use as an authentication mechanism in your applications. ... read more

Orchestrating AWS Lambda Functions Using AWS Step Functions

  • by Emre Yilmaz
  • Jan 17, 2018
  • AWS, Serverless
AWS Step Functions

While our serverless applications grow day by day; the need to orchestrate our Lambda functions may become an issue. We might need to execute some functions sequentially and one of our functions might get output of another function as input. Similarly, some functions might require to be executed in parallel. In these cases, AWS Step Functions can help us to coordinate our Lambda executions as components of our distributed applications and microservices.

In this blog post, I will make an introduction to AWS Step functions with a simple case. I will try to show how we can define sequential and parallel executions, as well as intermediary states to transform one state’s output to pass another state as input. ... read more