Example of using Golang Chi router with a shared redis dependency

main.go

package main

import (
	"log"
	"net/http"

	"github.com/go-chi/chi"
	"github.com/go-redis/redis"
)

type API struct {
	router chi.Router
	redis  *redis.Client
}

func NewAPI() (*API, error) {
	redisClient := redis.NewClient(&redis.Options{
		Addr: "127.0.0.1:6379",
	})

	err := redisClient.Ping().Err()
	if err != nil {
		return nil, err
	}

	router := chi.NewRouter()

	api := &API{
		redis:  redisClient,
		router: router,
	}

	return api, nil
}

func (a *API) getName(w http.ResponseWriter, r *http.Request) {
	name, err := a.redis.Get("NAME").Result()
	if err != nil {
		http.Error(w, http.StatusText(404), 404)
		return
	}

	w.Write([]byte(name))
	return
}

func (a *API) setName(w http.ResponseWriter, r *http.Request) {
	keys, ok := r.URL.Query()["name"]
	if !ok || len(keys[0]) < 1 {
		http.Error(w, "Url Param 'name' is missing", 400)
		return
	}

	name := keys[0]

	err := a.redis.Set("NAME", name, 0).Err()
	if err != nil {
		log.Println(err)
		http.Error(w, http.StatusText(500), 500)
		return
	}

	http.Error(w, http.StatusText(201), 201)
	return
}

func main() {
	api, err := NewAPI()
	if err != nil {
		log.Fatal(err)
	}

	api.router.Get("/", api.getName)
	api.router.Post("/", api.setName)
	http.ListenAndServe(":8080", api.router)
}