/
backup_sample.py
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/
backup_sample.py
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# Copyright 2020 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""This application demonstrates how to create and restore from backups
using Cloud Spanner.
For more information, see the README.rst under /spanner.
"""
import argparse
from datetime import datetime, timedelta
import time
from google.cloud import spanner
# [START spanner_create_backup]
def create_backup(instance_id, database_id, backup_id):
"""Creates a backup for a database."""
spanner_client = spanner.Client()
instance = spanner_client.instance(instance_id)
database = instance.database(database_id)
# Create a backup
expire_time = datetime.utcnow() + timedelta(days=14)
backup = instance.backup(backup_id, database=database, expire_time=expire_time)
operation = backup.create()
# Wait for backup operation to complete.
operation.result(1200)
# Verify that the backup is ready.
backup.reload()
assert backup.is_ready() is True
# Get the name, create time and backup size.
backup.reload()
print(
"Backup {} of size {} bytes was created at {}".format(
backup.name, backup.size_bytes, backup.create_time
)
)
# [END spanner_create_backup]
# [START spanner_restore_database]
def restore_database(instance_id, new_database_id, backup_id):
"""Restores a database from a backup."""
spanner_client = spanner.Client()
instance = spanner_client.instance(instance_id)
# Create a backup on database_id.
# Start restoring backup to a new database.
backup = instance.backup(backup_id)
new_database = instance.database(new_database_id)
operation = new_database.restore(backup)
# Wait for restore operation to complete.
operation.result(1200)
# Newly created database has restore information.
new_database.reload()
restore_info = new_database.restore_info
print(
"Database {} restored to {} from backup {}.".format(
restore_info.backup_info.source_database,
new_database_id,
restore_info.backup_info.backup,
)
)
# [END spanner_restore_database]
# [START spanner_cancel_backup]
def cancel_backup(instance_id, database_id, backup_id):
spanner_client = spanner.Client()
instance = spanner_client.instance(instance_id)
database = instance.database(database_id)
expire_time = datetime.utcnow() + timedelta(days=30)
# Create a backup.
backup = instance.backup(backup_id, database=database, expire_time=expire_time)
operation = backup.create()
# Cancel backup creation.
operation.cancel()
# Cancel operations are best effort so either it will complete or
# be cancelled.
while not operation.done():
time.sleep(300) # 5 mins
# Deal with resource if the operation succeeded.
if backup.exists():
print("Backup was created before the cancel completed.")
backup.delete()
print("Backup deleted.")
else:
print("Backup creation was successfully cancelled.")
# [END spanner_cancel_backup]
# [START spanner_list_backup_operations]
def list_backup_operations(instance_id, database_id):
spanner_client = spanner.Client()
instance = spanner_client.instance(instance_id)
# List the CreateBackup operations.
filter_ = (
"(metadata.database:{}) AND "
"(metadata.@type:type.googleapis.com/"
"google.spanner.admin.database.v1.CreateBackupMetadata)"
).format(database_id)
operations = instance.list_backup_operations(filter_=filter_)
for op in operations:
metadata = op.metadata
print(
"Backup {} on database {}: {}% complete.".format(
metadata.name, metadata.database, metadata.progress.progress_percent
)
)
# [END spanner_list_backup_operations]
# [START spanner_list_database_operations]
def list_database_operations(instance_id):
spanner_client = spanner.Client()
instance = spanner_client.instance(instance_id)
# List the progress of restore.
filter_ = (
"(metadata.@type:type.googleapis.com/"
"google.spanner.admin.database.v1.OptimizeRestoredDatabaseMetadata)"
)
operations = instance.list_database_operations(filter_=filter_)
for op in operations:
print(
"Database {} restored from backup is {}% optimized.".format(
op.metadata.name, op.metadata.progress.progress_percent
)
)
# [END spanner_list_database_operations]
# [START spanner_list_backups]
def list_backups(instance_id, database_id, backup_id):
spanner_client = spanner.Client()
instance = spanner_client.instance(instance_id)
# List all backups.
print("All backups:")
for backup in instance.list_backups():
print(backup.name)
# List all backups that contain a name.
print('All backups with backup name containing "{}":'.format(backup_id))
for backup in instance.list_backups(filter_="name:{}".format(backup_id)):
print(backup.name)
# List all backups for a database that contains a name.
print('All backups with database name containing "{}":'.format(database_id))
for backup in instance.list_backups(filter_="database:{}".format(database_id)):
print(backup.name)
# List all backups that expire before a timestamp.
expire_time = datetime.utcnow().replace(microsecond=0) + timedelta(days=30)
print(
'All backups with expire_time before "{}-{}-{}T{}:{}:{}Z":'.format(
*expire_time.timetuple()
)
)
for backup in instance.list_backups(
filter_='expire_time < "{}-{}-{}T{}:{}:{}Z"'.format(*expire_time.timetuple())
):
print(backup.name)
# List all backups with a size greater than some bytes.
print("All backups with backup size more than 100 bytes:")
for backup in instance.list_backups(filter_="size_bytes > 100"):
print(backup.name)
# List backups that were created after a timestamp that are also ready.
create_time = datetime.utcnow().replace(microsecond=0) - timedelta(days=1)
print(
'All backups created after "{}-{}-{}T{}:{}:{}Z" and are READY:'.format(
*create_time.timetuple()
)
)
for backup in instance.list_backups(
filter_='create_time >= "{}-{}-{}T{}:{}:{}Z" AND state:READY'.format(
*create_time.timetuple()
)
):
print(backup.name)
print("All backups with pagination")
for page in instance.list_backups(page_size=2).pages:
for backup in page:
print(backup.name)
# [END spanner_list_backups]
# [START spanner_delete_backup]
def delete_backup(instance_id, backup_id):
spanner_client = spanner.Client()
instance = spanner_client.instance(instance_id)
backup = instance.backup(backup_id)
backup.reload()
# Wait for databases that reference this backup to finish optimizing.
while backup.referencing_databases:
time.sleep(30)
backup.reload()
# Delete the backup.
backup.delete()
# Verify that the backup is deleted.
assert backup.exists() is False
print("Backup {} has been deleted.".format(backup.name))
# [END spanner_delete_backup]
# [START spanner_update_backup]
def update_backup(instance_id, backup_id):
spanner_client = spanner.Client()
instance = spanner_client.instance(instance_id)
backup = instance.backup(backup_id)
backup.reload()
# Expire time must be within 366 days of the create time of the backup.
old_expire_time = backup.expire_time
new_expire_time = old_expire_time + timedelta(days=30)
backup.update_expire_time(new_expire_time)
print(
"Backup {} expire time was updated from {} to {}.".format(
backup.name, old_expire_time, new_expire_time
)
)
# [END spanner_update_backup]
if __name__ == "__main__": # noqa: C901
parser = argparse.ArgumentParser(
description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter
)
parser.add_argument("instance_id", help="Your Cloud Spanner instance ID.")
parser.add_argument(
"--database-id", help="Your Cloud Spanner database ID.", default="example_db"
)
parser.add_argument(
"--backup-id", help="Your Cloud Spanner backup ID.", default="example_backup"
)
subparsers = parser.add_subparsers(dest="command")
subparsers.add_parser("create_backup", help=create_backup.__doc__)
subparsers.add_parser("cancel_backup", help=cancel_backup.__doc__)
subparsers.add_parser("update_backup", help=update_backup.__doc__)
subparsers.add_parser("restore_database", help=restore_database.__doc__)
subparsers.add_parser("list_backups", help=list_backups.__doc__)
subparsers.add_parser("list_backup_operations", help=list_backup_operations.__doc__)
subparsers.add_parser(
"list_database_operations", help=list_database_operations.__doc__
)
subparsers.add_parser("delete_backup", help=delete_backup.__doc__)
args = parser.parse_args()
if args.command == "create_backup":
create_backup(args.instance_id, args.database_id, args.backup_id)
elif args.command == "cancel_backup":
cancel_backup(args.instance_id, args.database_id, args.backup_id)
elif args.command == "update_backup":
update_backup(args.instance_id, args.backup_id)
elif args.command == "restore_database":
restore_database(args.instance_id, args.database_id, args.backup_id)
elif args.command == "list_backups":
list_backups(args.instance_id, args.database_id, args.backup_id)
elif args.command == "list_backup_operations":
list_backup_operations(args.instance_id, args.database_id)
elif args.command == "list_database_operations":
list_database_operations(args.instance_id)
elif args.command == "delete_backup":
delete_backup(args.instance_id, args.backup_id)
else:
print("Command {} did not match expected commands.".format(args.command))