BuildingScalableBackendsWithGo

ShijuVarghese

AboutMe

• ConsultingSolutionsArchitect• FocusedonGoandGoogleCloud

@shijucv|https://medium.com/@shijuvar

Agenda

• IntroductiontoGo• Goasalanguageforbuildingscalablebackendsystems• Demo-RESTfulAPIwithGo

GoasaLanguageforBuildingScalableBackendSystems

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gocanbedescribedinthreewords:Simple,MinimalandPragmatic.

» MinimalisticlanguagewithPragmaticDesign» AStaticTypeLanguagewithHighProductivity» ConcurrencyisaBuilt-inFeature» GoCompilesProgramsQuickly» GoisaGeneral-PurposeLanguage» GoMobileProject

IntroducingGo

GoEcosystem

» Golanguage» Golibraries» Gotooling

WhyGo?

» ConcurrencyandCommunicatingSequentialProcesses(CSP)

» ModernC» PragmatismandDeveloperproductivity» GoCommunity» Gosuccessstories-Docker,Kubernetes,CoreOSandsuccessfulimplementationsofMicroservices

» LanguagefortheeraofCloud,MicroservicesandContainers

BuildingHTTPServers

net/httpPackage

» ProvidesHTTPclientandserverimplementations» AllowsyoutobuildHTTPserversinGo» Providescomposabilityandextensibility

ProcessingHTTPRequests

» ServeMux-HTTPrequestmultiplexer» Handler-ServeHTTPrequests

http.HandlerInterface

type Handler interface { ServeHTTP(ResponseWriter, *Request) }

» ServeHTTPrequests.» HandlersareresponsibleforwritingheadersandbodiesintoHTTPresponses.

packagemain

import("fmt""net/http")

funchello(whttp.ResponseWriter,r*http.Request){fmt.Fprintf(w,"Helloworld!")}

funcmain(){http.HandleFunc("/",hello)http.ListenAndServe(":8000",nil)}

AnHTTPServer

HTTPMiddleware

» Pluggableandself-containedpieceofcodethatwrapswebapplicationhandlers.

» Componentsthatworkasanotherlayerintherequesthandlingcycle,whichcanexecutesomelogicbeforeorafterexecutingapplicationhandlers.

» Greatforimplementingcross-cuttingconcerns:Authentication,authorization,caching,loggingetc.

funcloggingHandler(nexthttp.Handler)http.Handler{returnhttp.HandlerFunc(func(whttp.ResponseWriter,r*http.Request){start:=time.Now()log.Printf("Started%s%s",r.Method,r.URL.Path)next.ServeHTTP(w,r)log.Printf("Completed%sin%v",r.URL.Path,time.Since(start))})}

//ApplyingMiddlewarehttp.Handle("/",loggingHandler(indexHandler))http.Handle("/about",loggingHandler(aboutHandler))

Demo-RESTAPIwithGoandMongoDB

Source:https://github.com/shijuvar/go-web/tree/master/taskmanager

» GoisagreatstackforbuildingscalablebackendsystemsandMicroservices.

» GoisagreatstackforbuildingRESTfulAPIs.

KeyTakeaways

ShijuVarghesegophermonk@gmail.com