first commit

internal/database/migrate.go

@@ -0,0 +1,44 @@
+package database
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/golang-migrate/migrate/v4"
+	_ "github.com/golang-migrate/migrate/v4/database/postgres"
+	_ "github.com/golang-migrate/migrate/v4/source/file"
+)
+
+func RunMigrations(databaseURL, migrationsPath string) error {
+	m, err := migrate.New(
+		fmt.Sprintf("file://%s", migrationsPath),
+		databaseURL,
+	)
+	if err != nil {
+		return fmt.Errorf("create migrator: %w", err)
+	}
+	defer m.Close()
+
+	if err := m.Up(); err != nil && !errors.Is(err, migrate.ErrNoChange) {
+		return fmt.Errorf("migrate up: %w", err)
+	}
+
+	return nil
+}
+
+func RollbackMigrations(databaseURL, migrationsPath string) error {
+	m, err := migrate.New(
+		fmt.Sprintf("file://%s", migrationsPath),
+		databaseURL,
+	)
+	if err != nil {
+		return fmt.Errorf("create migrator: %w", err)
+	}
+	defer m.Close()
+
+	if err := m.Down(); err != nil && !errors.Is(err, migrate.ErrNoChange) {
+		return fmt.Errorf("migrate down: %w", err)
+	}
+
+	return nil
+}

internal/database/postgres.go

@@ -0,0 +1,34 @@
+package database
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+func NewPool(ctx context.Context, databaseURL string) (*pgxpool.Pool, error) {
+	cfg, err := pgxpool.ParseConfig(databaseURL)
+	if err != nil {
+		return nil, fmt.Errorf("parse database url: %w", err)
+	}
+
+	cfg.MaxConns = 20
+	cfg.MinConns = 2
+	cfg.MaxConnLifetime = time.Hour
+	cfg.MaxConnIdleTime = 30 * time.Minute
+	cfg.HealthCheckPeriod = time.Minute
+
+	pool, err := pgxpool.NewWithConfig(ctx, cfg)
+	if err != nil {
+		return nil, fmt.Errorf("create pool: %w", err)
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		pool.Close()
+		return nil, fmt.Errorf("ping database: %w", err)
+	}
+
+	return pool, nil
+}