refactor

pkg/transaction/transaction.go

@@ -0,0 +1,101 @@
+package transaction
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/TelegramExchange/pkg/postgres"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/rs/zerolog/log"
+)
+
+var (
+	errMissingInit  = errors.New("missing `transaction.Init' call before `transaction.Begin'")
+	errMissingBegin = errors.New("missing `transaction.Begin' call before 'transaction.Get'")
+)
+
+var (
+	pool       *pgxpool.Pool
+	IsUnitTest bool
+)
+
+type ctxKey struct{}
+
+func Init(p *postgres.Pool) {
+	pool = p.Pool
+}
+
+type Transaction struct {
+	pgx.Tx
+}
+
+func Begin(ctx context.Context) (context.Context, error) {
+	if IsUnitTest {
+		return ctx, nil
+	}
+
+	if pool == nil {
+		return nil, errMissingInit
+	}
+
+	tx, err := pool.Begin(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("pool.Begin: %w", err)
+	}
+
+	ctx = context.WithValue(ctx, ctxKey{}, &Transaction{tx})
+
+	return ctx, nil
+}
+
+func Rollback(ctx context.Context) {
+	if IsUnitTest {
+		return
+	}
+
+	tx, ok := ctx.Value(ctxKey{}).(*Transaction)
+	if !ok {
+		return
+	}
+
+	err := tx.Rollback(ctx)
+	if err != nil && !errors.Is(err, pgx.ErrTxClosed) {
+		log.Error().Err(err).Msg("transaction: Rollback")
+	}
+}
+
+func Commit(ctx context.Context) error {
+	if IsUnitTest {
+		return nil
+	}
+
+	tx, ok := ctx.Value(ctxKey{}).(*Transaction)
+	if !ok {
+		return errMissingBegin
+	}
+
+	err := tx.Commit(ctx)
+	if err != nil {
+		return fmt.Errorf("tx.Commit: %w", err)
+	}
+
+	return nil
+}
+
+type Executor interface {
+	Exec(ctx context.Context, sql string, args ...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 TryExtractTX(ctx context.Context) Executor {
+	tx, ok := ctx.Value(ctxKey{}).(*Transaction)
+	if !ok {
+		return pool
+	}
+
+	return tx
+}

pkg/transaction/wrap.go

@@ -0,0 +1,38 @@
+package transaction
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/rs/zerolog/log"
+)
+
+func Wrap(ctx context.Context, fn func(context.Context) error) error {
+	tx, err := pool.Begin(ctx)
+	if err != nil {
+		return fmt.Errorf("pool.Begin: %w", err)
+	}
+
+	defer func() {
+		err = tx.Rollback(ctx)
+		if err != nil && !errors.Is(err, pgx.ErrTxClosed) {
+			log.Error().Err(err).Msg("transaction: Rollback")
+		}
+	}()
+
+	ctx = context.WithValue(ctx, ctxKey{}, &Transaction{tx})
+
+	err = fn(ctx)
+	if err != nil {
+		return fmt.Errorf("fn: %w", err)
+	}
+
+	err = tx.Commit(ctx)
+	if err != nil {
+		return fmt.Errorf("tx.Commit: %w", err)
+	}
+
+	return nil
+}