Remove support for Google Spanner database. (#105846)

* Remove support for Google Spanner database.

pkg/storage/unified/sql/sqltemplate/dialect.go

@@ -24,8 +24,6 @@ func DialectForDriver(driverName string) Dialect {
 		return PostgreSQL
 	case "sqlite", "sqlite3":
 		return SQLite
-	case "spanner":
-		return Spanner
 	default:
 		return nil
 	}

pkg/storage/unified/sql/sqltemplate/dialect_spanner.go

@@ -1,32 +0,0 @@
-package sqltemplate
-
-// Spanner is an implementation of Dialect for the Google Spanner database.
-var Spanner = spanner{}
-
-var _ Dialect = Spanner
-
-type spanner struct{}
-
-func (s spanner) DialectName() string {
-	return "spanner"
-}
-
-func (s spanner) Ident(a string) (string, error) {
-	return backtickIdent{}.Ident(a)
-}
-
-func (s spanner) ArgPlaceholder(argNum int) string {
-	return argFmtSQL92.ArgPlaceholder(argNum)
-}
-
-func (s spanner) SelectFor(a ...string) (string, error) {
-	return rowLockingClauseSpanner.SelectFor(a...)
-}
-
-func (spanner) CurrentEpoch() string {
-	return "UNIX_MICROS(CURRENT_TIMESTAMP())"
-}
-
-var rowLockingClauseSpanner = rowLockingClauseMap{
-	SelectForUpdate: SelectForUpdate,
-}

pkg/storage/unified/sql/test/benchmark_test.go

@@ -6,6 +6,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/require"
+
 	"github.com/grafana/grafana/pkg/infra/db"
 	"github.com/grafana/grafana/pkg/infra/tracing"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
@@ -15,7 +17,6 @@ import (
 	"github.com/grafana/grafana/pkg/storage/unified/sql"
 	"github.com/grafana/grafana/pkg/storage/unified/sql/db/dbimpl"
 	test "github.com/grafana/grafana/pkg/storage/unified/testing"
-	"github.com/stretchr/testify/require"
 )
 
 func newTestBackend(b testing.TB) resource.StorageBackend {
@@ -40,9 +41,6 @@ func TestIntegrationBenchmarkSQLStorageBackend(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test in short mode")
 	}
-	if db.IsTestDBSpanner() {
-		t.Skip("Skipping benchmark on Spanner")
-	}
 	opts := test.DefaultBenchmarkOptions()
 	if db.IsTestDbSQLite() {
 		opts.Concurrency = 1 // to avoid SQLite database is locked error
@@ -54,9 +52,6 @@ func TestIntegrationBenchmarkResourceServer(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test in short mode")
 	}
-	if db.IsTestDBSpanner() {
-		t.Skip("Skipping benchmark on Spanner")
-	}
 
 	ctx := context.Background()
 	opts := &test.BenchmarkOptions{

pkg/storage/unified/sql/test/integration_test.go

@@ -35,9 +35,6 @@ func TestMain(m *testing.M) {
 }
 
 func TestIntegrationStorageServer(t *testing.T) {
-	if db.IsTestDBSpanner() {
-		t.Skip("skipping integration test")
-	}
 	unitest.RunStorageServerTest(t, func(ctx context.Context) resource.StorageBackend {
 		dbstore := db.InitTestDB(t)
 		eDB, err := dbimpl.ProvideResourceDB(dbstore, setting.NewCfg(), nil)
@@ -58,10 +55,6 @@ func TestIntegrationStorageServer(t *testing.T) {
 
 // TestStorageBackend is a test for the StorageBackend interface.
 func TestIntegrationSQLStorageBackend(t *testing.T) {
-	if db.IsTestDBSpanner() {
-		t.Skip("skipping integration test")
-	}
-
 	t.Run("IsHA (polling notifier)", func(t *testing.T) {
 		unitest.RunStorageBackendTest(t, func(ctx context.Context) resource.StorageBackend {
 			dbstore := db.InitTestDB(t)
@@ -105,9 +98,6 @@ func TestIntegrationSearchAndStorage(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test in short mode")
 	}
-	if db.IsTestDBSpanner() {
-		t.Skip("Skipping benchmark on Spanner")
-	}
 
 	ctx := context.Background()
 
@@ -145,9 +135,6 @@ func TestClientServer(t *testing.T) {
 	if db.IsTestDbSQLite() {
 		t.Skip("TODO: test blocking, skipping to unblock Enterprise until we fix this")
 	}
-	if db.IsTestDBSpanner() {
-		t.Skip("skipping integration test")
-	}
 
 	ctx := testutil.NewTestContext(t, time.Now().Add(5*time.Second))
 	dbstore := db.InitTestDB(t)