Fix deletion of dashboard if it was trashed out of band

dashboards/resource_dashboard.go

@@ -2,9 +2,11 @@ package dashboards
 
 import (
 	"context"
+	"errors"
 	"log"
 	"strings"
 
+	"github.com/databricks/databricks-sdk-go/apierr"
 	"github.com/databricks/databricks-sdk-go/service/dashboards"
 	"github.com/databricks/terraform-provider-databricks/common"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
@@ -175,9 +177,32 @@ func ResourceDashboard() common.Resource {
 			if err != nil {
 				return err
 			}
-			return w.Lakeview.Trash(ctx, dashboards.TrashDashboardRequest{
+
+			// Attempt to trash the dashboard.
+			err = w.Lakeview.Trash(ctx, dashboards.TrashDashboardRequest{
 				DashboardId: d.Id(),
 			})
+
+			// If the dashboard was already trashed, we'll get a 403 (Permission Denied) error.
+			// There may be other cases where we get a 403, so we first confirm that the
+			// dashboard state is actually trashed, and if so, return success.
+			if errors.Is(err, apierr.ErrPermissionDenied) {
+				dashboard, nerr := w.Lakeview.Get(ctx, dashboards.GetDashboardRequest{
+					DashboardId: d.Id(),
+				})
+
+				// Return original error if we can't get the dashboard state.
+				if nerr != nil {
+					return err
+				}
+
+				// If the dashboard is trashed, return success.
+				if dashboard.LifecycleState == dashboards.LifecycleStateTrashed {
+					return nil
+				}
+			}
+
+			return err
 		},
 	}
 }

dashboards/resource_dashboard_test.go

@@ -4,10 +4,12 @@ import (
 	"fmt"
 	"testing"
 
+	"github.com/databricks/databricks-sdk-go/apierr"
 	"github.com/databricks/databricks-sdk-go/experimental/mocks"
 	"github.com/databricks/databricks-sdk-go/service/dashboards"
 	"github.com/databricks/terraform-provider-databricks/qa"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
 )
 
@@ -222,9 +224,12 @@ func TestDashboardUpdate(t *testing.T) {
 }
 
 func TestDashboardDelete(t *testing.T) {
-	qa.ResourceFixture{
+	_, err := qa.ResourceFixture{
 		MockWorkspaceClientFunc: func(w *mocks.MockWorkspaceClient) {
-			w.GetMockLakeviewAPI().EXPECT().Trash(mock.Anything, dashboards.TrashDashboardRequest{
+			e := w.GetMockLakeviewAPI().EXPECT()
+
+			// Expect the dashboard to be trashed.
+			e.Trash(mock.Anything, dashboards.TrashDashboardRequest{
 				DashboardId: "xyz",
 			}).Return(nil)
 		},
@@ -237,5 +242,73 @@ func TestDashboardDelete(t *testing.T) {
 			parent_path = "/path"
 			serialized_dashboard = "serialized_json"
 		`,
-	}.ApplyNoError(t)
+	}.Apply(t)
+
+	// Expect this to succeed.
+	assert.NoError(t, err)
+}
+
+func TestDashboardDeletePermissionDenied(t *testing.T) {
+	_, err := qa.ResourceFixture{
+		MockWorkspaceClientFunc: func(w *mocks.MockWorkspaceClient) {
+			e := w.GetMockLakeviewAPI().EXPECT()
+
+			// First, expect the dashboard to be trashed.
+			e.Trash(mock.Anything, dashboards.TrashDashboardRequest{
+				DashboardId: "xyz",
+			}).Return(apierr.ErrPermissionDenied)
+
+			// Then, expect to get the dashboard to confirm if it was already trashed.
+			// We confirm below that the below error is ignored and the original error is returned.
+			e.Get(mock.Anything, dashboards.GetDashboardRequest{
+				DashboardId: "xyz",
+			}).Return(nil, fmt.Errorf("some other error"))
+		},
+		Resource: ResourceDashboard(),
+		Delete:   true,
+		ID:       "xyz",
+		HCL: `
+			display_name = "Dashboard name"
+			warehouse_id = "abc"
+			parent_path = "/path"
+			serialized_dashboard = "serialized_json"
+		`,
+	}.Apply(t)
+
+	// We expect the original error to be returned.
+	assert.Equal(t, err, apierr.ErrPermissionDenied)
+}
+
+func TestDashboardDeleteAlreadyTrashed(t *testing.T) {
+	_, err := qa.ResourceFixture{
+		MockWorkspaceClientFunc: func(w *mocks.MockWorkspaceClient) {
+			e := w.GetMockLakeviewAPI().EXPECT()
+
+			// First, expect the dashboard to be trashed.
+			e.Trash(mock.Anything, dashboards.TrashDashboardRequest{
+				DashboardId: "xyz",
+			}).Return(apierr.ErrPermissionDenied)
+
+			// Then, expect to get the dashboard to confirm if it was already trashed.
+			e.Get(mock.Anything, dashboards.GetDashboardRequest{
+				DashboardId: "xyz",
+			}).Return(&dashboards.Dashboard{
+				DashboardId:    "xyz",
+				ParentPath:     "/path",
+				LifecycleState: dashboards.LifecycleStateTrashed,
+			}, nil)
+		},
+		Resource: ResourceDashboard(),
+		Delete:   true,
+		ID:       "xyz",
+		HCL: `
+			display_name = "Dashboard name"
+			warehouse_id = "abc"
+			parent_path = "/path"
+			serialized_dashboard = "serialized_json"
+		`,
+	}.Apply(t)
+
+	// Expect this to succeed.
+	assert.NoError(t, err)
 }