Book Image

TypeScript Microservices

Book Image

TypeScript Microservices

Overview of this book

In the last few years or so, microservices have achieved the rock star status and right now are one of the most tangible solutions in enterprises to make quick, effective, and scalable applications. The apparent rise of Typescript and long evolution from ES5 to ES6 has seen lots of big companies move to ES6 stack. If you want to learn how to leverage the power of microservices to build robust architecture using reactive programming and Typescript in Node.js, then this book is for you. Typescript Microservices is an end-to-end guide that shows you the implementation of microservices from scratch; right from starting the project to hardening and securing your services. We will begin with a brief introduction to microservices before learning to break your monolith applications into microservices. From here, you will learn reactive programming patterns and how to build APIs for microservices. The next set of topics will take you through the microservice architecture with TypeScript and communication between services. Further, you will learn to test and deploy your TypeScript microservices using the latest tools and implement continuous integration. Finally, you will learn to secure and harden your microservice. By the end of the book, you will be able to build production-ready, scalable, and maintainable microservices using Node.js and Typescript.

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Table of Contents (17 chapters)
Title Page
Title Page
Copyright and Credits
Copyright and Credits
Packt Upsell
Packt Upsell
Contributors
Contributors
Preface
Preface
Free Chapter
1
Debunking Microservices
Debunking Microservices
Debunking microservices
Key considerations while adopting microservices
Microservice FAQs
Twelve-factor application of microservices
Microservices in the current world
Microservice design aspects
Microservice design patterns
Summary
2
Gearing up for the Journey
Gearing up for the Journey
Setting up primary environment
Primer to TypeScript
Primer to Node.js
Writing your first Hello World microservice
Summary
3
Exploring Reactive Programming
Exploring Reactive Programming
Introduction to reactive programming
Reactive Manifesto
Major building blocks and concerns
When to react and when not to react (orchestrate)
Being reactive in Node.js
Summary
4
Beginning Your Microservice Journey
Beginning Your Microservice Journey
Overview of shopping cart microservices 
Architecture design of our system 
Design aspects involved
Schema design and database selection 
Microservice predevelopment aspects
Developing some microservices for a shopping cart 
Microservice design best practices
Summary
5
Understanding API Gateway
Understanding API Gateway
Debunking API Gateway
Concerns API Gateway handles
API Gateway design patterns and aspects
Circuit breakers and its role
Need for gateway in our shopping cart microservices
Available API Gateways options
Designing our gateway for shopping cart microservices
Summary
6
Service Registry and Discovery
Service Registry and Discovery
Introduction to the service registry
What, why, and how of service registry and discovery
Service discovery patterns
Service registry patterns
Service registry and discovery options
How to choose service registry and discovery
Summary
7
Service State and Interservice Communication
Service State and Interservice Communication
Core concepts – state, communication, and dependencies 
Communication styles
Versioning microservices and failure handling
Case Study – The NetFlix Stack
Message queues and brokers
Introduction to pub/sub pattern
Sharing dependencies
Cache
Summary
8
Testing, Debugging, and Documenting
Testing, Debugging, and Documenting
Testing
Debugging
Documenting
Summary
9
Deployment, Logging, and Monitoring
Deployment, Logging, and Monitoring
Deployment
Logging 
Monitoring 
Production-ready microservice criteria
Summary
10
Hardening Your Application
Hardening Your Application
Questions you should be asking while applying security
Security best practices for individual services/applications
Security best practices for containers
Security checklist
Scalability
Summary
Other Books You May Enjoy
Other Books You May Enjoy
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Index
Index

Debugging

Debugging is one of the most important aspects in the development of any system. Debugging, or the art of solving problems, is crucial in software development as it helps us to identify issues, profile the system, and identify the culprits responsible for taking down the system. There are some classic definitions of debugging:

"Debugging is like solving a murder mystery in which you are the murderer. If debugging is the process of removing bugs, then software development is the process of putting these bugs in it"

– Edsgar Dijkstra.

Debugging a TypeScript microservice is very similar to debugging any web application. Going for open source free alternatives, we will go for node-inspector, as it also provides very useful profiling tools.

Note

We already saw debugging through VS Code in Chapter 2, Gearing up for the Journey.

In the next section, we will learn how to profile and debug our application using node-inspector. We will look at various aspects of remote debugging and how to build...

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