app-api/internal/database/mysql.go

package database

import (
	"context"
	"database/sql"
	"fmt"
	"time"

	"github.com/go-sql-driver/mysql"
	_ "github.com/go-sql-driver/mysql"
	"github.com/luxsin/app-api/internal/config"
)

func Open(cfg config.DatabaseConfig) (*sql.DB, error) {
	mc := mysql.Config{
		User:   cfg.User,
		Passwd: cfg.Password,
		Net:    "tcp",
		Addr:   fmt.Sprintf("%s:%d", cfg.Host, cfg.Port),
		DBName: cfg.Name,
		Params: map[string]string{
			"charset":              "utf8mb4",
			"parseTime":            "True",
			"loc":                  "Local",
			"allowNativePasswords": "true",
		},
	}

	db, err := sql.Open("mysql", mc.FormatDSN())
	if err != nil {
		return nil, fmt.Errorf("open mysql: %w", err)
	}

	db.SetMaxOpenConns(25)
	db.SetMaxIdleConns(5)
	db.SetConnMaxLifetime(5 * time.Minute)

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	if err := db.PingContext(ctx); err != nil {
		_ = db.Close()
		return nil, fmt.Errorf("ping mysql: %w", err)
	}

	return db, nil
}