Introduction to Microservices

May 05, 2021

Microservices architecture is a distinctive approach to software system development that focuses on the construction of a single-function module with well-defined operations and interfaces. This trend has gained popularity over the past few years as companies want to become more agile and turn to DevOps and continuous testing. Microservices have numerous advantages for large companies such as Netflix, Amazon, Paypal, and other tech starters have evolved from monolithic to microservices architecture.

Go is a novel language compared with other languages. It has a number of advantages because the programs coded in GoLang are more robust. They enable applications to withstand large loads with loaded services. GoLang is best adapted to multiprocessor systems and web applications. The reason for this is its legacy with the programming languages of the C family as GoLang components are easier to combine with components coded into other languages from the same family category. It works a lot better than C, C++.

Frameworks used within GoLang for Microservice Architecture.

Go Micro

Go Micro is the most widely used RPC framework. This is a plug-in RPC framework and has an automatic service discovery, meaning applications are automatically logged into the service discovery system. It takes charge of load balancing as it helps to balance demands between service bodies. It handles synchronous and asynchronous communication modes.

It consists of three layers, with the first layer defined for service absorption. The second layer is a client-server template which has blocks and is used to write the service, and the client provides an interface. The third layer contains add-ons:

Broker – It functions as asynchronous communication and provides a messaging interface.
Codec used for encrypting and deciphering messages.
Registry – This is a service search.
Selector – Used for the load equilibration abstraction built on the register.
Transport – The synchronous demand communication channel between departments.

Go Kit

Go Kit is a programming toolbox to construct microservices. This is a library which can be imported within a binary package. It gives you the packages to:

Authentication - BasicAuth and JWT are available.
Transport - It is for HTTP,gRPC.
Logging - It provides an interface to both structured logging and services.
Metrics - Used in CloudWatch, Graphite and more.
Tracing - Opentracing and Zipkin
Service Discovery - To Consul Eureka and other people.
Circuit breaker - To implement Hystrix within Go.

Gizmo

Gizmo is a microservices tool kit by the New York Times. It helps with placing server and pubsub daemons into packages. Gizmo goes through the following packages.

Server - The system offers server implementations. For example: SimpleServer(over HTTP) and RPCServer(over gRPC). The kit is made from Go Kit.
Config - It consists of JSON blobs, JSON files or environment variables.
PubSub - It provides generic interfaces for data usage from queues and publishes afterwards.
PubSubtest - It contains test implementations for subscribers and editors interfaces.
Web - It describes the analysis functions of requests and payload requests.

Kite

This is a frame for microservice development in Go. It displays Server packets and RPC clients and automatically registers with a Kontrol service discovery system. Kontrol is written in Kite, and that's a favor in itself. This means that kite microservice works well in its environment.