Initial project snapshot

backend/internal/platform/postgres/postgres.go

@@ -0,0 +1,33 @@
+package postgres
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"github.com/example/remote-access-platform/backend/internal/platform/config"
+)
+
+func Open(ctx context.Context, cfg config.PostgresConfig) (*pgxpool.Pool, error) {
+	poolConfig, err := pgxpool.ParseConfig(cfg.DSN)
+	if err != nil {
+		return nil, fmt.Errorf("parse postgres dsn: %w", err)
+	}
+
+	poolConfig.MaxConns = cfg.MaxConns
+	poolConfig.MinConns = cfg.MinConns
+	poolConfig.ConnConfig.ConnectTimeout = cfg.ConnectTimeout
+
+	pool, err := pgxpool.NewWithConfig(ctx, poolConfig)
+	if err != nil {
+		return nil, fmt.Errorf("create postgres pool: %w", err)
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		pool.Close()
+		return nil, fmt.Errorf("ping postgres: %w", err)
+	}
+
+	return pool, nil
+}

backend/internal/platform/postgres/tx.go

@@ -0,0 +1,34 @@
+package postgres
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type DBTX interface {
+	Exec(ctx context.Context, sql string, arguments ...any) (pgconn.CommandTag, error)
+	Query(ctx context.Context, sql string, args ...any) (pgx.Rows, error)
+	QueryRow(ctx context.Context, sql string, args ...any) pgx.Row
+}
+
+func WithTransaction(ctx context.Context, pool *pgxpool.Pool, fn func(tx pgx.Tx) error) error {
+	tx, err := pool.BeginTx(ctx, pgx.TxOptions{})
+	if err != nil {
+		return fmt.Errorf("begin transaction: %w", err)
+	}
+
+	if err := fn(tx); err != nil {
+		_ = tx.Rollback(ctx)
+		return err
+	}
+
+	if err := tx.Commit(ctx); err != nil {
+		return fmt.Errorf("commit transaction: %w", err)
+	}
+
+	return nil
+}