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取消备份创建操作

取消创建备份数据库的操作。

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如需查看包含此代码示例的详细文档，请参阅以下内容：

使用客户端库备份和恢复数据库

代码示例

C++

如需了解如何安装和使用 Spanner 客户端库，请参阅 Spanner 客户端库。

如需向 Spanner 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅为本地开发环境设置身份验证。

void CreateBackupAndCancel(
    google::cloud::spanner_admin::DatabaseAdminClient client,
    std::string const& project_id, std::string const& instance_id,
    std::string const& database_id, std::string const& backup_id,
    google::cloud::spanner::Timestamp expire_time) {
  google::cloud::spanner::Database database(project_id, instance_id,
                                            database_id);
  google::spanner::admin::database::v1::CreateBackupRequest request;
  request.set_parent(database.instance().FullName());
  request.set_backup_id(backup_id);
  request.mutable_backup()->set_database(database.FullName());
  *request.mutable_backup()->mutable_expire_time() =
      expire_time.get<google::protobuf::Timestamp>().value();
  auto f = client.CreateBackup(request);
  f.cancel();
  auto backup = f.get();
  if (backup) {
    auto status = client.DeleteBackup(backup->name());
    if (!status.ok()) throw std::move(status);
    std::cout << "Backup " << backup->name() << " was deleted.\n";
  } else {
    std::cout << "CreateBackup operation was cancelled with the message '"
              << backup.status().message() << "'.\n";
  }
}

C#

如需了解如何安装和使用 Spanner 客户端库，请参阅 Spanner 客户端库。

如需向 Spanner 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅为本地开发环境设置身份验证。


using Google.Cloud.Spanner.Admin.Database.V1;
using Google.Cloud.Spanner.Common.V1;
using Google.LongRunning;
using Google.Protobuf.WellKnownTypes;
using System;

public class CancelBackupOperationSample
{
    public Operation<Backup, CreateBackupMetadata> CancelBackupOperation(string projectId, string instanceId, string databaseId, string backupId)
    {
        // Create the DatabaseAdminClient instance.
        DatabaseAdminClient databaseAdminClient = DatabaseAdminClient.Create();

        // Initialize backup request parameters.
        Backup backup = new Backup
        {
            DatabaseAsDatabaseName = DatabaseName.FromProjectInstanceDatabase(projectId, instanceId, databaseId),
            ExpireTime = DateTime.UtcNow.AddDays(14).ToTimestamp()
        };
        InstanceName parentAsInstanceName = InstanceName.FromProjectInstance(projectId, instanceId);

        // Make the CreateBackup request.
        Operation<Backup, CreateBackupMetadata> operation = databaseAdminClient.CreateBackup(parentAsInstanceName, backup, backupId);

        // Cancel the operation.
        operation.Cancel();

        // Poll until the long-running operation is completed in case the backup was
        // created before the operation was cancelled.
        Console.WriteLine("Waiting for the operation to finish.");
        Operation<Backup, CreateBackupMetadata> completedOperation = operation.PollUntilCompleted();

        if (completedOperation.IsFaulted)
        {
            Console.WriteLine($"Create backup operation cancelled: {operation.Name}");
        }
        else
        {
            Console.WriteLine("The backup was created before the operation was cancelled. Backup needs to be deleted.");
            BackupName backupAsBackupName = BackupName.FromProjectInstanceBackup(projectId, instanceId, backupId);
            databaseAdminClient.DeleteBackup(backupAsBackupName);
        }

        return completedOperation;
    }
}

Go

如需了解如何安装和使用 Spanner 客户端库，请参阅 Spanner 客户端库。

如需向 Spanner 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅为本地开发环境设置身份验证。


import (
	"context"
	"fmt"
	"io"
	"regexp"
	"time"

	longrunning "cloud.google.com/go/longrunning/autogen/longrunningpb"
	database "cloud.google.com/go/spanner/admin/database/apiv1"
	pbt "github.com/golang/protobuf/ptypes/timestamp"
	adminpb "google.golang.org/genproto/googleapis/spanner/admin/database/v1"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

func cancelBackup(ctx context.Context, w io.Writer, db, backupID string) error {
	matches := regexp.MustCompile("^(.+)/databases/(.+)$").FindStringSubmatch(db)
	if matches == nil || len(matches) != 3 {
		return fmt.Errorf("cancelBackup: invalid database id %q", db)
	}

	adminClient, err := database.NewDatabaseAdminClient(ctx)
	if err != nil {
		return fmt.Errorf("cancelBackup.NewDatabaseAdminClient: %w", err)
	}
	defer adminClient.Close()

	expireTime := time.Now().AddDate(0, 0, 14)
	// Create a backup.
	req := adminpb.CreateBackupRequest{
		Parent:   matches[1],
		BackupId: backupID,
		Backup: &adminpb.Backup{
			Database:   db,
			ExpireTime: &pbt.Timestamp{Seconds: expireTime.Unix(), Nanos: int32(expireTime.Nanosecond())},
		},
	}
	op, err := adminClient.CreateBackup(ctx, &req)
	if err != nil {
		return fmt.Errorf("cancelBackup.CreateBackup: %w", err)
	}

	// Cancel backup creation.
	err = adminClient.LROClient.CancelOperation(ctx, &longrunning.CancelOperationRequest{Name: op.Name()})
	if err != nil {
		return fmt.Errorf("cancelBackup.CancelOperation: %w", err)
	}

	// Cancel operations are best effort so either it will complete or be
	// cancelled.
	backup, err := op.Wait(ctx)
	if err != nil {
		if waitStatus, ok := status.FromError(err); !ok || waitStatus.Code() != codes.Canceled {
			return fmt.Errorf("cancelBackup.Wait: %w", err)
		}
	} else {
		// Backup was completed before it could be cancelled so delete the
		// unwanted backup.
		err = adminClient.DeleteBackup(ctx, &adminpb.DeleteBackupRequest{Name: backup.Name})
		if err != nil {
			return fmt.Errorf("cancelBackup.DeleteBackup: %w", err)
		}
	}

	fmt.Fprintf(w, "Backup cancelled.\n")
	return nil
}

Java

如需了解如何安装和使用 Spanner 客户端库，请参阅 Spanner 客户端库。

如需向 Spanner 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅为本地开发环境设置身份验证。

static void cancelCreateBackup(
    DatabaseAdminClient dbAdminClient, String projectId, String instanceId,
    String databaseId, String backupId) {
  // Set expire time to 14 days from now.
  Timestamp expireTime =
      Timestamp.newBuilder().setSeconds(TimeUnit.MILLISECONDS.toSeconds((
          System.currentTimeMillis() + TimeUnit.DAYS.toMillis(14)))).build();
  BackupName backupName = BackupName.of(projectId, instanceId, backupId);
  Backup backup = Backup.newBuilder()
      .setName(backupName.toString())
      .setDatabase(DatabaseName.of(projectId, instanceId, databaseId).toString())
      .setExpireTime(expireTime).build();

  try {
    // Start the creation of a backup.
    System.out.println("Creating backup [" + backupId + "]...");
    OperationFuture<Backup, CreateBackupMetadata> op = dbAdminClient.createBackupAsync(
        InstanceName.of(projectId, instanceId), backup, backupId);

    // Try to cancel the backup operation.
    System.out.println("Cancelling create backup operation for [" + backupId + "]...");
    dbAdminClient.getOperationsClient().cancelOperation(op.getName());

    // Get a polling future for the running operation. This future will regularly poll the server
    // for the current status of the backup operation.
    RetryingFuture<OperationSnapshot> pollingFuture = op.getPollingFuture();

    // Wait for the operation to finish.
    // isDone will return true when the operation is complete, regardless of whether it was
    // successful or not.
    while (!pollingFuture.get().isDone()) {
      System.out.println("Waiting for the cancelled backup operation to finish...");
      Thread.sleep(TimeUnit.MILLISECONDS.convert(5, TimeUnit.SECONDS));
    }
    if (pollingFuture.get().getErrorCode() == null) {
      // Backup was created before it could be cancelled. Delete the backup.
      dbAdminClient.deleteBackup(backupName);
      System.out.println("Backup operation for [" + backupId
          + "] successfully finished before it could be cancelled");
    } else if (pollingFuture.get().getErrorCode().getCode() == StatusCode.Code.CANCELLED) {
      System.out.println("Backup operation for [" + backupId + "] successfully cancelled");
    }
  } catch (ExecutionException e) {
    throw SpannerExceptionFactory.newSpannerException(e.getCause());
  } catch (InterruptedException e) {
    throw SpannerExceptionFactory.propagateInterrupt(e);
  }
}

Node.js

如需了解如何安装和使用 Spanner 客户端库，请参阅 Spanner 客户端库。

如需向 Spanner 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅为本地开发环境设置身份验证。


// Imports the Google Cloud client library and precise date library
const {Spanner, protos} = require('@google-cloud/spanner');
/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'my-project-id';
// const instanceId = 'my-instance';
// const databaseId = 'my-database';
// const backupId = 'my-backup';

// Creates a client
const spanner = new Spanner({
  projectId: projectId,
});

// Gets a reference to a Cloud Spanner Database Admin Client object
const databaseAdminClient = spanner.getDatabaseAdminClient();

// Creates a new backup of the database
try {
  console.log(
    `Creating backup of database ${databaseAdminClient.databasePath(
      projectId,
      instanceId,
      databaseId
    )}.`
  );

  // Expire backup one day in the future
  const expireTime = Date.now() + 1000 * 60 * 60 * 24;
  const [operation] = await databaseAdminClient.createBackup({
    parent: databaseAdminClient.instancePath(projectId, instanceId),
    backupId: backupId,
    backup: (protos.google.spanner.admin.database.v1.Backup = {
      database: databaseAdminClient.databasePath(
        projectId,
        instanceId,
        databaseId
      ),
      expireTime: Spanner.timestamp(expireTime).toStruct(),
      name: databaseAdminClient.backupPath(projectId, instanceId, backupId),
    }),
  });

  // Cancel the backup
  await operation.cancel();

  console.log('Backup cancelled.');
} catch (err) {
  console.error('ERROR:', err);
} finally {
  // Delete backup in case it got created before the cancel operation
  await databaseAdminClient.deleteBackup({
    name: databaseAdminClient.backupPath(projectId, instanceId, backupId),
  });
  // Close the spanner client when finished.
  // The databaseAdminClient does not require explicit closure. The closure of the Spanner client will automatically close the databaseAdminClient.
  spanner.close();
}

PHP

如需了解如何安装和使用 Spanner 客户端库，请参阅 Spanner 客户端库。

如需向 Spanner 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅为本地开发环境设置身份验证。

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\Admin\Database\V1\Backup;
use Google\Cloud\Spanner\Admin\Database\V1\Client\DatabaseAdminClient;
use Google\Cloud\Spanner\Admin\Database\V1\CreateBackupRequest;
use Google\Cloud\Spanner\Admin\Database\V1\DeleteBackupRequest;
use Google\Cloud\Spanner\Admin\Database\V1\GetBackupRequest;
use Google\Protobuf\Timestamp;

/**
 * Cancel a backup operation.
 * Example:
 * ```
 * cancel_backup($projectId, $instanceId, $databaseId);
 * ```
 *
 * @param string $projectId The Google Cloud project ID.
 * @param string $instanceId The Spanner instance ID.
 * @param string $databaseId The Spanner database ID.
 */
function cancel_backup(string $projectId, string $instanceId, string $databaseId): void
{
    $databaseAdminClient = new DatabaseAdminClient();
    $databaseFullName = DatabaseAdminClient::databaseName($projectId, $instanceId, $databaseId);
    $instanceFullName = DatabaseAdminClient::instanceName($projectId, $instanceId);
    $expireTime = new Timestamp();
    $expireTime->setSeconds((new \DateTime('+14 days'))->getTimestamp());
    $backupId = uniqid('backup-' . $databaseId . '-cancel');
    $request = new CreateBackupRequest([
        'parent' => $instanceFullName,
        'backup_id' => $backupId,
        'backup' => new Backup([
            'database' => $databaseFullName,
            'expire_time' => $expireTime
        ])
    ]);

    $operation = $databaseAdminClient->createBackup($request);
    $operation->cancel();

    // Cancel operations are always successful regardless of whether the operation is
    // still in progress or is complete.
    printf('Cancel backup operation complete.' . PHP_EOL);

    // Operation may succeed before cancel() has been called. So we need to clean up created backup.
    try {
        $request = new GetBackupRequest();
        $request->setName($databaseAdminClient->backupName($projectId, $instanceId, $backupId));
        $info = $databaseAdminClient->getBackup($request);
    } catch (ApiException $ex) {
        return;
    }
    $databaseAdminClient->deleteBackup(new DeleteBackupRequest([
        'name' => $databaseAdminClient->backupName($projectId, $instanceId, $backupId)
    ]));
}

Python

如需了解如何安装和使用 Spanner 客户端库，请参阅 Spanner 客户端库。

如需向 Spanner 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅为本地开发环境设置身份验证。

def cancel_backup(instance_id, database_id, backup_id):
    from google.cloud.spanner_admin_database_v1.types import \
        backup as backup_pb

    spanner_client = spanner.Client()
    database_admin_api = spanner_client.database_admin_api

    expire_time = datetime.utcnow() + timedelta(days=30)

    # Create a backup.
    request = backup_pb.CreateBackupRequest(
        parent=database_admin_api.instance_path(spanner_client.project, instance_id),
        backup_id=backup_id,
        backup=backup_pb.Backup(
            database=database_admin_api.database_path(
                spanner_client.project, instance_id, database_id
            ),
            expire_time=expire_time,
        ),
    )

    operation = database_admin_api.create_backup(request)
    # Cancel backup creation.
    operation.cancel()

    # Cancel operations are the best effort so either it will complete or
    # be cancelled.
    while not operation.done():
        time.sleep(300)  # 5 mins

    try:
        database_admin_api.get_backup(
            backup_pb.GetBackupRequest(
                name=database_admin_api.backup_path(
                    spanner_client.project, instance_id, backup_id
                ),
            )
        )
    except NotFound:
        print("Backup creation was successfully cancelled.")
        return
    print("Backup was created before the cancel completed.")
    database_admin_api.delete_backup(
        backup_pb.DeleteBackupRequest(
            name=database_admin_api.backup_path(
                spanner_client.project, instance_id, backup_id
            ),
        )
    )
    print("Backup deleted.")

Ruby

如需了解如何安装和使用 Spanner 客户端库，请参阅 Spanner 客户端库。

如需向 Spanner 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅为本地开发环境设置身份验证。

# project_id  = "Your Google Cloud project ID"
# instance_id = "Your Spanner instance ID"
# database_id = "Your Spanner database ID"
# backup_id = "Your Spanner backup ID"

require "google/cloud/spanner"
require "google/cloud/spanner/admin/database"

database_admin_client = Google::Cloud::Spanner::Admin::Database.database_admin

instance_path = database_admin_client.instance_path project: project_id, instance: instance_id

db_path = database_admin_client.database_path project: project_id,
                                              instance: instance_id,
                                              database: database_id

backup_path = database_admin_client.backup_path project: project_id,
                                                instance: instance_id,
                                                backup: backup_id

expire_time = Time.now + (14 * 24 * 3600) # 14 days from now

job = database_admin_client.create_backup parent: instance_path,
                                          backup_id: backup_id,
                                          backup: {
                                            database: db_path,
                                              expire_time: expire_time
                                          }

puts "Backup operation in progress"

job.cancel
job.wait_until_done!

begin
  backup = database_admin_client.get_backup name: backup_path
  database_admin_client.delete_backup name: backup_path if backup
rescue StandardError
  nil # no cleanup needed when a backup is not created
end
puts "#{backup_id} creation job cancelled"

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅 Google Cloud 示例浏览器。