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package query
import (
"context"
"database/sql"
"errors"
"fmt"
"strings"
"time"
"github.com/lxc/incus/v6/shared/logger"
)
// Transaction executes the given function within a database transaction with a 30s context timeout.
func Transaction(ctx context.Context, db *sql.DB, f func(context.Context, *sql.Tx) error) error {
ctx, cancel := context.WithTimeout(ctx, time.Second*30)
defer cancel()
tx, err := db.BeginTx(ctx, nil)
if err != nil {
// If there is a leftover transaction let's try to rollback,
// we'll then retry again.
if strings.Contains(err.Error(), "cannot start a transaction within a transaction") {
_, _ = db.Exec("ROLLBACK")
}
return fmt.Errorf("Failed to begin transaction: %w", err)
}
err = f(ctx, tx)
if err != nil {
return rollback(tx, err)
}
err = tx.Commit()
if errors.Is(err, sql.ErrTxDone) {
err = nil // Ignore duplicate commits/rollbacks
}
return err
}
// Rollback a transaction after the given error occurred. If the rollback
// succeeds the given error is returned, otherwise a new error that wraps it
// gets generated and returned.
func rollback(tx *sql.Tx, reason error) error {
err := Retry(context.TODO(), func(_ context.Context) error { return tx.Rollback() })
if err != nil {
logger.Warnf("Failed to rollback transaction after error (%v): %v", reason, err)
}
return reason
}
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