Initial commit

server/internal/database/database.go

@@ -0,0 +1,81 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+type OpenOptions struct {
+	MaxOpenConns    int
+	MaxIdleConns    int
+	ConnMaxIdleTime time.Duration
+	ConnMaxLifetime time.Duration
+}
+
+func defaultOpenOptions() OpenOptions {
+	return OpenOptions{MaxOpenConns: 20, MaxIdleConns: 5, ConnMaxIdleTime: 5 * time.Minute, ConnMaxLifetime: 30 * time.Minute}
+}
+
+func normalizeOpenOptions(options []OpenOptions) (OpenOptions, error) {
+	if len(options) == 0 {
+		return defaultOpenOptions(), nil
+	}
+	value := options[0]
+	if value.MaxOpenConns < 1 || value.MaxIdleConns < 0 || value.MaxIdleConns > value.MaxOpenConns {
+		return OpenOptions{}, fmt.Errorf("invalid database connection pool limits")
+	}
+	if value.ConnMaxIdleTime <= 0 || value.ConnMaxLifetime <= 0 {
+		return OpenOptions{}, fmt.Errorf("database connection lifetimes must be positive")
+	}
+	return value, nil
+}
+
+func Open(ctx context.Context, dsn string, appLogger *slog.Logger, options ...OpenOptions) (*gorm.DB, error) {
+	poolOptions, err := normalizeOpenOptions(options)
+	if err != nil {
+		return nil, err
+	}
+	db, err := gorm.Open(postgres.New(postgres.Config{DSN: dsn}), &gorm.Config{
+		Logger:         newStructuredGORMLogger(appLogger),
+		TranslateError: true,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("open postgres: %w", err)
+	}
+
+	sqlDB, err := db.DB()
+	if err != nil {
+		return nil, fmt.Errorf("get sql db: %w", err)
+	}
+	sqlDB.SetMaxOpenConns(poolOptions.MaxOpenConns)
+	sqlDB.SetMaxIdleConns(poolOptions.MaxIdleConns)
+	sqlDB.SetConnMaxIdleTime(poolOptions.ConnMaxIdleTime)
+	sqlDB.SetConnMaxLifetime(poolOptions.ConnMaxLifetime)
+
+	pingCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+	if err := sqlDB.PingContext(pingCtx); err != nil {
+		_ = sqlDB.Close()
+		return nil, fmt.Errorf("ping postgres: %w", err)
+	}
+	appLogger.Info("database connected")
+	return db, nil
+}
+
+func Close(db *gorm.DB) error {
+	sqlDB, err := db.DB()
+	if err != nil {
+		return err
+	}
+	return sqlDB.Close()
+}
+
+func SQLDB(db *gorm.DB) (*sql.DB, error) {
+	return db.DB()
+}