talent/db.go

package main

import (
	"fmt"
	"time"

	"github.com/rs/zerolog/log"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

var DB *gorm.DB

func connectToDB() {
	dsn := fmt.Sprintf(
		"host=%v user=%v password=%v dbname=%v port=%v sslmode=disable TimeZone=Asia/Taipei",
		DB_HOST, DB_USER, DB_PASSWD, DB_NAME, DB_PORT,
	)
	config := &gorm.Config{
		Logger:                 logger.Default,
		SkipDefaultTransaction: true,
	}
	for {
		db, err := gorm.Open(postgres.New(postgres.Config{
			DSN: dsn, // data source name
			// PreferSimpleProtocol: true, // disables implicit prepared statement usage
		}), config)
		if err == nil {
			DB = db
			break
		}
		log.Warn().Err(err).Msg("Unable to connect to database")
		log.Warn().Msgf("Retrying in %v second.", 5)
		time.Sleep(time.Second * 5)
	}
	log.Info().Msg("Connection to postgres, ok.")
}

func migrateDB() {
	if err := DB.SetupJoinTable(&User{}, "Products", &Order{}); err != nil {
		panic(err)
	}
	if err := DB.AutoMigrate(&Node{}, &User{}, &Profile{}, &Product{}, &Order{}); err != nil {
		panic(err)
	}
}