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http go

Important Impala answered on January 23, 2021 Popularity 10/10 Helpfulness 4/10

answer http go

related golang http

http go

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package main

import (
	"fmt"
	"net/http"
	"time"
)

func greet(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hello World! %s", time.Now())
}

func main() {
	http.HandleFunc("/", greet)
	http.ListenAndServe(":8080", nil)
}

Popularity 10/10 Helpfulness 4/10 Language go

Source: Grepper

Tags: go http

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Contributed on Jan 23 2021

Important Impala

0 Answers Avg Quality 2/10

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golang http

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package main

import (
	"context"
	"database/sql"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	_ "github.com/lib/pq"
	migrate "github.com/rubenv/sql-migrate"
)

func main() {
	SetupDatabase()
	router := http.NewServeMux()

	router.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("content-type", "application/json")

		fmt.Fprintln(w, map[string]interface{}{"data": "hello wordl"})
	})

	SetupGraceFullShutdown(router)
}

func SetupDatabase() *sql.DB {
	driver_name := "postgres"
	dsn_url := "postgres://admin:admin@localhost:5432/postgres?sslmode=disable"
	migration_dir := "./database/migrations"

	db, _ := sql.Open(driver_name, dsn_url)

	if err := db.Ping(); err != nil {
		log.Fatalf("Database connection error: %s", err.Error())
	}

	if os.Getenv("GO_ENV") == "development" {
		migrations := migrate.FileMigrationSource{
			Dir: migration_dir,
		}

		if _, err := migrations.FindMigrations(); err != nil {
			log.Fatalf("Find migration database error: %s", err.Error())
		}

		if _, err := migrate.Exec(db, driver_name, migrations, migrate.Up); err != nil {
			log.Fatalf("Execute migration database error: %s", err.Error())
		}
	}

	defer log.Println("Database connection success")
	return db
}

func SetupGraceFullShutdown(handler *http.ServeMux) {
	httpServer := http.Server{
		Addr:           fmt.Sprintf(":%s", "3000"),
		ReadTimeout:    time.Duration(time.Second) * 60,
		WriteTimeout:   time.Duration(time.Second) * 30,
		IdleTimeout:    time.Duration(time.Second) * 120,
		MaxHeaderBytes: 3145728,
		Handler:        handler,
	}

	if err := httpServer.ListenAndServe(); err != nil {
		log.Fatalf("Server is not running: %s", err.Error())
		os.Exit(0)
	}

	osSignal := make(chan os.Signal, 1)
	signal.Notify(osSignal, os.Interrupt, syscall.SIGTERM)
	log.Printf("Signal received: %v", <-osSignal)

	if sig := <-osSignal; sig == os.Interrupt || sig == syscall.SIGTERM {
		log.Println("Waiting to server shutdown")

		ctx, cancel := context.WithTimeout(context.Background(), time.Duration(time.Second)*10)
		defer cancel()

		if err := httpServer.Shutdown(ctx); err != nil {
			log.Println("HTTP server shutdown error: %s", err.Error())
		}

		log.Println("HTTP server shutdown")
	}
}

Popularity 10/10 Helpfulness 2/10 Language go

Source: Grepper

Tags: go g

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Contributed on Dec 19 2022

Restu Wahyu Saputra

0 Answers Avg Quality 2/10

http go

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