register postgres drivers with unique names

cloudsql.go

@@ -2,13 +2,16 @@ package cloudsql
 
 import (
 	"context"
+	"fmt"
 
 	"cloud.google.com/go/cloudsqlconn"
 	"cloud.google.com/go/cloudsqlconn/postgres/pgxv4"
 	"github.com/hashicorp/vault/plugins/database/postgresql"
 	dbplugin "github.com/hashicorp/vault/sdk/database/dbplugin/v5"
 	"github.com/hashicorp/vault/sdk/database/helper/connutil"
 	"github.com/pkg/errors"
+
+	uuid "github.com/hashicorp/go-uuid"
 )
 
 // CloudSQL implements Vault's Database interface
@@ -111,9 +114,14 @@ func newPostgresDatabase(dbType DBType, connProducer *connutil.SQLConnectionProd
 	// attribute 'sslmode=disable' is required. even though the sslmode parameter is set to disable,
 	// the Cloud SQL Auth proxy does provide an encrypted connection.
 	// See: https://cloud.google.com/sql/docs/postgres/connect-admin-proxy#connect-to-proxy
-	cleanup, err := pgxv4.RegisterDriver(dbType.String(), cloudsqlconn.WithIAMAuthN())
+	driverSuffix, err := uuid.GenerateUUID()
+	driverName := fmt.Sprintf("postgres-%s", driverSuffix)
+	if err != nil {
+		return nil, nil, nil, errors.Wrap(err, "failed to generate unique 'postgres' driver name.")
+	}
+	cleanup, err := pgxv4.RegisterDriver(driverName, cloudsqlconn.WithIAMAuthN())
 	if err != nil {
-		return nil, nil, nil, errors.Wrap(err, "failed to register 'postgres' driver with 'cloud-sql-go-connector'")
+		return nil, nil, nil, errors.Wrapf(err, "failed to register 'postgres' driver with name %s.", driverName)
 	}
 
 	// delegate to vault's original postgres backend

cloudsql_test.go

@@ -3,6 +3,7 @@ package cloudsql
 import (
 	"database/sql"
 	"reflect"
+	"strings"
 	"testing"
 	"unsafe"
 
@@ -34,11 +35,11 @@ func TestNewDelegatesToVaultPostgresPlugin(t *testing.T) {
 	// assert that the driver was registered correctly
 	foundDriver := false
 	for _, v := range sql.Drivers() {
-		if v == Postgres.String() {
+		if strings.HasPrefix(v, "postgres-") {
 			foundDriver = true
 		}
 	}
 	if !foundDriver {
-		t.Error("expected the driver 'cloudsql-postgres' to be registered but was not found")
+		t.Error("expected a driver prefixed with 'postgres-' to be registered but was not found")
 	}
 }

cmd/vault-plugin-database-cloudsql/serve_test.go

@@ -4,10 +4,10 @@ import (
 	"context"
 	"database/sql"
 	"os"
+	"strings"
 	"testing"
 	"time"
 
-	"github.com/expel-io/vault-plugin-database-cloudsql/cloudsql"
 	"github.com/hashicorp/go-plugin"
 )
 
@@ -29,7 +29,7 @@ func TestServe(t *testing.T) {
 	// assert that the driver was registered correctly
 	foundDriver := false
 	for _, v := range sql.Drivers() {
-		if v == cloudsql.Postgres.String() {
+		if strings.HasPrefix(v, "postgres-") {
 			foundDriver = true
 		}
 	}