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main.go
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package main
import (
"context"
"flag"
"log"
"net/http"
"os"
"os/signal"
"time"
"github.com/zainul/xs/internal/gateways/cache/redis"
"github.com/gorilla/mux"
HTTPHandler "github.com/zainul/xs/internal/delivery/http"
"github.com/zainul/xs/internal/gateways/database/postgres"
"github.com/zainul/xs/internal/pkg/initial"
userRepository "github.com/zainul/xs/internal/repository/user"
"github.com/zainul/xs/internal/usecase/user"
)
func commonMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
next.ServeHTTP(w, r)
})
}
func main() {
var wait time.Duration
flag.DurationVar(&wait,
"graceful-timeout", time.Second*15,
"the duration for which the server gracefully wait for existing connections to finish - e.g. 15s or 1m")
flag.Parse()
db := initial.GetDB()
r := mux.NewRouter()
r.Use(commonMiddleware)
////////////////////////////////////////////////////////////////////////////
////////////////////////////// APPLICATION /////////////////////////////////
////////////////////////////////////////////////////////////////////////////
userDBStore := postgres.NewUserStore(db)
userCached := redis.NewCached("someconfig")
userCounter := redis.NewCounter("someconfig")
userRepo := userRepository.NewUserRepository(userDBStore, userCached, userCounter)
useCaseUser := user.NewUserUseCase(userRepo)
HTTPHandler.NewUserHandler(r, useCaseUser)
////////////////////////////////////////////////////////////////////////////
http.Handle("/", r)
// config the http server
srv := &http.Server{
Addr: "0.0.0.0:7000",
// Good practice to set timeouts to avoid Slowloris attacks.
// WriteTimeout: time.Second * 1,
ReadTimeout: time.Second * 15, // -> it will be in config file
// IdleTimeout: time.Second * 1,
Handler: r, // Pass our instance of gorilla/mux in.
}
// Run our server in a goroutine so that it doesn't block.
go func() {
log.Println("Server up :7000")
if err := srv.ListenAndServe(); err != nil {
log.Println(err)
}
}()
c := make(chan os.Signal, 1)
// We'll accept graceful shutdowns when quit via SIGINT (Ctrl+C)
// SIGKILL, SIGQUIT or SIGTERM (Ctrl+/) will not be caught.
signal.Notify(c, os.Interrupt)
// Block until we receive our signal.
<-c
// Create a deadline to wait for.
ctx, cancel := context.WithTimeout(context.Background(), wait)
defer cancel()
// Doesn't block if no connections, but will otherwise wait
// until the timeout deadline.
srv.Shutdown(ctx)
// Optionally, you could run srv.Shutdown in a goroutine and block on
// <-ctx.Done() if your application should wait for other services
// to finalize based on context cancellation.
log.Println("shutting down")
os.Exit(0)
}