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

Summary

In this chapter, we debunked API Gateway. We understood the pros and cons of introducing API Gateway and what concerns API Gateway can handle centrally. We looked at design aspects of API Gateway and understood the need for API Gateway in our system. We had a look at the circuit breaker and why it was vital to have. We looked at available gateway options like Zuul, Express Gateway, reverse proxy, and designed our own gateway for shopping cart microservices.

In the next chapter, we will learn about service registry and service discovery. We will see how gateway connects with service discovery to automatically know the location of moving services. We will see ways in which a service can be registered and learn the pros and cons of each approach. We will see some options like consul and implement them in our shopping cart microservices.

Previous Section
End of Chapter 5
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