snapshot of https://github.com/ory/keto.git (master, 2026-09-16; blobs > 131072B omitted)

oryx/crdbx/isolation.go

@@ -0,0 +1,32 @@
+// Copyright © 2026 Ory Corp
+// SPDX-License-Identifier: Apache-2.0
+
+package crdbx
+
+import (
+	"github.com/ory/pop/v6"
+	"github.com/ory/x/dbal"
+	"github.com/ory/x/sqlcon"
+)
+
+// SetTransactionReadCommitted lowers the isolation of the current transaction
+// to READ COMMITTED on CockroachDB. Multi-statement read transactions at
+// SERIALIZABLE must refresh their whole read set when a concurrent write
+// bumps the transaction timestamp, and surface RETRY_SERIALIZABLE to the
+// client when the refresh fails; under READ COMMITTED every statement reads
+// at its own timestamp and those conflicts are absorbed server-side. Must be
+// called before the transaction runs its first query. Postgres already runs
+// statements at READ COMMITTED by default, and MySQL's SET TRANSACTION
+// applies to the next transaction rather than the current one, so every
+// other dialect is a no-op. YugabyteDB maps READ COMMITTED to snapshot
+// isolation unless yb_enable_read_committed_isolation is enabled, so it stays
+// on the normal transaction retry path instead of using this CockroachDB-only
+// override.
+func SetTransactionReadCommitted(c *pop.Connection) error {
+	if c.Dialect.Name() != dbal.DriverCockroachDB {
+		// Only CockroachDB supports and needs this.
+		return nil
+	}
+
+	return sqlcon.HandleError(c.RawQuery("SET TRANSACTION ISOLATION LEVEL READ COMMITTED").Exec())
+}