Microservices in Go with Go kit
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The document discusses microservices architecture and Go Kit, emphasizing their role in building highly scalable applications. It describes the components of Go Kit's architecture, including the transport, endpoint, and service layers, and highlights the importance of clean architecture principles. Additionally, it covers middleware functionalities for enhancing service operations, such as logging and rate limiting.
Microservices in Go with Go kit
- 1. Microservices in Go with Go kit Shiju Varghese https://medium.com/@shijuvar DevConf.IN August 02, 2019 Bengaluru
- 2. About Me • Consulting Solutions Architect on Go and Distributed Systems • Published Author: Web Development with Go and Go Recipes • Awarded Microsoft MVP seven times • Speaker at numerous conferences • medium.com/@shijuvar | github.com/shijuvar | linkedin.com/in/shijuvar
- 3. Agenda • Introduction to Microservices Architecture • Introduction to Go kit • Building Microservices with Go kit
- 5. Scale Cube : 3 Dimensions to Scale
- 6. Microservices is an architectural style for building highly scalable applications, in which an application decomposes into a set of services as functional components. Microservices Architecture is all about functional decomposition.
- 7. • A modern, practical programming language • Concurrent, Simple, Fast, Type-safe, Compiled very quickly • A great language for Cloud-Native, Microservices Go Programming Language
- 8. Go kit
- 9. Go kit • A programming toolkit (collection of Go packages) for building robust, reliable, maintainable microservices • Solves common problems in distributed systems • Bootstrap development towards Microservices • Go kit design is well-suited for modern software design: both microservices and elegant monoliths
- 10. Go kit Architecture There are three major components in the Go kit based application architecture: • Transport layer: The transport domain • Endpoint layer: An RPC method • Service layer: Business logic layer
- 11. Transports • The transport domain is bound to concrete transports • Provide transports like HTTP, gRPC, NATS, AMQP, Thrift, etc • A single microservice can support multiple transports
- 12. Endpoints • An RPC method bound to a service method • RPC as the primary messaging pattern • Each endpoint exposes the service method to the outside world using Transport layer type Endpoint func(ctx context.Context, request interface{}) (response interface{}, err error)
- 13. Services • Business logic modelled as interfaces • Based on the Clean Architecture or the Hexagonal Architecture • No knowledge about endpoint, concrete transports and encoding/ decoding
- 14. Clean Architecture The central rule of The Clean Architecture is the Dependency Rule, which says: Source code dependencies can only point inwards. In other words, the source code of each circle can only access code in an inner circle but never any code in an outer circle.
- 15. Flow of requests and responses • Request flow: Transport layer -> Endpoint layer -> Service layer • Response flow: Service layer -> Endpoint layer -> Transport layer
- 16. Demo: Building Services with Go kit
- 17. Middleware • A strict separation of concerns through use of the decorator • Wrap endpoints or services to add functionality, such as logging, rate limiting and distributed tracing • Two types of middlewares: Endpoint middleware and Service middleware
- 18. Endpoint Middleware • An endpoint middleware is a function that takes an endpoint and returns an endpoint. type Middleware func(Endpoint) Endpoint • Use endpoint middlewares for transport-domain concerns, like circuit breaking and rate limiting.
- 20. Service Middleware • An service middleware is a function that takes a service and returns a service. type Middleware func(Service) Service • Use service middlewares for business-domain concerns, like logging and instrumentation.
- 22. Demo: Wrapping Go kit services with Middlewares
- 23. Design of Go kit services 1. Implements the core business logic by defining an interface for service and providing a concrete implementation. 2. Writes service middlewares to provide additional functionality, like logging, analytics, instrumentation — anything that needs knowledge of business domain. 3. Go kit provides endpoint and transport domain middlewares, for functionality like rate limiting, circuit breaking, load balancing, and distributed tracing — all of which are generally agnostic to business domain.
- 25. Thanks Shiju Varghese [email protected] https://medium.com/@shijuvar https://github.com/shijuvar https://linkedin.com/in/shijuvar Go Programming Workshops: https://bit.ly/shijuv-go