Learning Functional Programming in Go

Our DI framework in action

This is when we actually perform the request. This is when all the decorators are executed:

client := Decorate(proxyTimeoutClient,       Authorization("mysecretpassword"),       LoadBalancing(RoundRobin(0, "web01:3000", "web02:3000", "web03:3000")),       Logging(log.New(InfoHandler, "client: ", log.Ltime)),       FaultTolerance(2, time.Second),)

The decorators are executed in order. Authorization goes first, followed by LoadBalancing, Logging, and FaultTolerance.

We create our IoC framework by defining the client interface with a single Do method:

type Client interface {       Do(*http.Request) (*http.Response, error)}

Wrap each decorator around a return c.Do(r) statement that fires once the following line is executed in the makeRequest method ...