128 lines
2.7 KiB
Go
128 lines
2.7 KiB
Go
package database
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import (
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"database/sql"
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"fmt"
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"log"
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"os"
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"regexp"
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"time"
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_ "github.com/go-sql-driver/mysql"
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)
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var DB *sql.DB
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func InitDB() error {
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if err := ensureDatabaseExists(); err != nil {
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return err
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}
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if err := connectToDatabase(); err != nil {
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return err
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}
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if err := ensureTablesExist(); err != nil {
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return err
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}
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log.Println("Database initialized successfully")
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return nil
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}
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func ensureDatabaseExists() error {
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dsn := getDSN("")
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db, err := sql.Open("mysql", dsn)
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if err != nil {
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return fmt.Errorf("failed to connect to database server: %w", err)
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}
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defer db.Close()
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// Get database name from environment
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dbName := os.Getenv("DB_NAME")
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// Check if database exists, create if not
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var exists bool
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err = db.QueryRow("SELECT EXISTS(SELECT 1 FROM information_schema.schemata WHERE schema_name = ?)", dbName).Scan(&exists)
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if err != nil {
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return fmt.Errorf("failed to check database existence: %w", err)
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}
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if !exists {
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if !isValidDatabaseName(dbName) {
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return fmt.Errorf("invalid database name: %s", dbName)
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}
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_, err = db.Exec("CREATE DATABASE `" + dbName + "` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci")
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if err != nil {
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return fmt.Errorf("failed to create database: %w", err)
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}
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}
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return nil
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}
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func connectToDatabase() error {
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dsn := getDSN(os.Getenv("DB_NAME"))
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var err error
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DB, err = sql.Open("mysql", dsn)
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if err != nil {
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return fmt.Errorf("failed to connect to database: %w", err)
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}
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DB.SetMaxOpenConns(25)
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DB.SetMaxIdleConns(25)
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DB.SetConnMaxLifetime(5 * time.Minute)
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return nil
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}
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func ensureTablesExist() error {
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_, err := DB.Exec(`
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CREATE TABLE IF NOT EXISTS contacts (
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id INT AUTO_INCREMENT PRIMARY KEY,
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name VARCHAR(120) NOT NULL,
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company VARCHAR(120) NOT NULL,
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phone VARCHAR(15) NOT NULL,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
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updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
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) DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
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`)
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if err != nil {
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return fmt.Errorf("failed to create contacts table: %w", err)
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}
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return nil
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}
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func CloseDB() {
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if DB != nil {
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DB.Close()
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}
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}
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func getDSN(dbName string) string {
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user := os.Getenv("DB_USER")
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password := os.Getenv("DB_PASSWORD")
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host := os.Getenv("DB_HOST")
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port := os.Getenv("DB_PORT")
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dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/", user, password, host, port)
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if dbName != "" {
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dsn += dbName
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}
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dsn += "?parseTime=true&charset=utf8mb4&collation=utf8mb4_unicode_ci"
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return dsn
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}
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func isValidDatabaseName(name string) bool {
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matched, _ := regexp.MatchString(`^[a-zA-Z0-9_-]+$`, name)
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return matched && len(name) > 0 && len(name) <= 64
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}
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