Book Image

Building Serverless Applications with Python

Book Image

Building Serverless Applications with Python

Overview of this book

Serverless architectures allow you to build and run applications and services without having to manage the infrastructure. Many companies have adopted this architecture to save cost and improve scalability. This book will help you design serverless architectures for your applications with AWS and Python. The book is divided into three modules. The first module explains the fundamentals of serverless architecture and how AWS lambda functions work. In the next module, you will learn to build, release, and deploy your application to production. You will also learn to log and test your application. In the third module, we will take you through advanced topics such as building a serverless API for your application. You will also learn to troubleshoot and monitor your app and master AWS lambda programming concepts with API references. Moving on, you will also learn how to scale up serverless applications and handle distributed serverless systems in production. By the end of the book, you will be equipped with the knowledge required to build scalable and cost-efficient Python applications with a serverless framework.

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Table of Contents (11 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
The Serverless Paradigm
The Serverless Paradigm
Understanding serverless architectures
Understanding microservices
Serverless architectures don't have to be real-time only
Pros and cons of serverless
Summary
2
Building a Serverless Application in AWS
Building a Serverless Application in AWS
Triggers in AWS Lambda
Lambda functions
Functions as containers
Configuring functions
Testing Lambda functions
Versioning Lambda functions
Creating deployment packages
Summary
3
Setting Up Serverless Architectures
Setting Up Serverless Architectures
S3 trigger
SNS trigger
SQS trigger
CloudWatch trigger
Summary
4
Deploying Serverless APIs
Deploying Serverless APIs
API methods and resources
Setting up integration
Deploying the Lambda function for API execution
Handling authentication and user controls
Summary
5
Logging and Monitoring
Logging and Monitoring
Understanding CloudWatch
Understanding CloudTrail
Lambda’s metrics in CloudWatch
Lambda's logs in CloudWatch
Logging statements in Lambda
Summary
6
Scaling Up Serverless Architectures
Scaling Up Serverless Architectures
Third-party orchestration tools
The creation and termination of servers
Security best practices
Identifying and handling difficulties in scaling
Summary
7
Security in AWS Lambda
Security in AWS Lambda
Understanding AWS Virtual Private Clouds (VPCs)
Understanding subnets in VPCs
Securing Lambda inside private subnets
Controlling access to Lambda functions
Using STS inside Lambda for secure session-based execution
Summary
8
Deploying a Lambda Function with SAM
Deploying a Lambda Function with SAM
Introduction to SAM
CloudFormation for serverless services
Deploying with SAM
Understanding security in SAM
Summary
9
Introduction to Microsoft Azure Functions
Introduction to Microsoft Azure Functions
Introduction to Microsoft Azure Functions
Creating your first Azure Function
Understanding triggers
Understanding logging and monitoring in Azures Functions
Best practices for writing Azure Functions
Summary
10
Other Books You May Enjoy
Other Books You May Enjoy
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SNS trigger

The SNS notification service can be used across multiple use cases, one of which involves triggering Lambda functions. The SNS trigger is popularly used as an interface between the AWS CloudWatch service and Lambda.

So, in this section, we will do the following:

  1. Create an SNS topic
  2. Create a CloudWatch alarm for our receiver-bucket bucket to monitor the number of objects in the bucket
  3. Once the objects count reaches 5, the alarm will be set to ALERT and the corresponding notification will be sent to the SNS topic that we have just created
  4. This SNS topic will then trigger a Lambda function, which prints out a Hello World message for us

This will help you understand how to monitor different AWS services and set up alarms for some thresholds for those metrics. And depending on whether the service's metrics have hit that threshold or not, the Lambda function will...

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