selfprivacy-rest-api/selfprivacy_api/backup/__init__.py
2023-07-17 16:05:00 +03:00

260 lines
9 KiB
Python

from typing import List, Optional
from datetime import datetime, timedelta
from selfprivacy_api.models.backup.snapshot import Snapshot
from selfprivacy_api.utils import ReadUserData
from selfprivacy_api.utils.redis_pool import RedisPool
from selfprivacy_api.services import get_service_by_id
from selfprivacy_api.services.service import Service
from selfprivacy_api.graphql.queries.providers import BackupProvider
from selfprivacy_api.backup.providers.provider import AbstractBackupProvider
from selfprivacy_api.backup.providers import get_provider
from selfprivacy_api.backup.storage import Storage
class Backups:
"""A singleton controller for backups"""
provider: AbstractBackupProvider
@staticmethod
def set_localfile_repo(file_path: str):
ProviderClass = get_provider(BackupProvider.FILE)
provider = ProviderClass(file_path)
Storage.store_testrepo_path(file_path)
Storage.store_provider(provider)
@staticmethod
def get_last_backed_up(service: Service) -> Optional[datetime]:
"""Get a timezone-aware time of the last backup of a service"""
return Storage.get_last_backup_time(service.get_id())
@staticmethod
def get_cached_snapshots_service(service_id: str) -> List[Snapshot]:
snapshots = Storage.get_cached_snapshots()
return [snap for snap in snapshots if snap.service_name == service_id]
@staticmethod
def sync_service_snapshots(service_id: str, snapshots: List[Snapshot]):
for snapshot in snapshots:
if snapshot.service_name == service_id:
Storage.cache_snapshot(snapshot)
for snapshot in Backups.get_cached_snapshots_service(service_id):
if snapshot.id not in [snap.id for snap in snapshots]:
Storage.delete_cached_snapshot(snapshot)
@staticmethod
def enable_autobackup(service: Service):
Storage.set_autobackup(service)
@staticmethod
def is_time_to_backup(time: datetime) -> bool:
"""
Intended as a time validator for huey cron scheduler of automatic backups
"""
enabled_services = Storage.services_with_autobackup()
for service_id in enabled_services:
if Backups.is_time_to_backup_service(service_id, time):
return True
return False
@staticmethod
def is_time_to_backup_service(service_id: str, time: datetime):
period = Backups.autobackup_period_minutes()
if period is None:
return False
if not Storage.is_autobackup_set(service_id):
return False
last_backup = Storage.get_last_backup_time(service_id)
if last_backup is None:
return True # queue a backup immediately if there are no previous backups
if time > last_backup + timedelta(minutes=period):
return True
return False
@staticmethod
def disable_autobackup(service: Service):
"""also see disable_all_autobackup()"""
Storage.unset_autobackup(service)
@staticmethod
def is_autobackup_enabled(service: Service) -> bool:
return Storage.is_autobackup_set(service.get_id())
@staticmethod
def autobackup_period_minutes() -> Optional[int]:
"""None means autobackup is disabled"""
return Storage.autobackup_period_minutes()
@staticmethod
def set_autobackup_period_minutes(minutes: int):
"""
0 and negative numbers are equivalent to disable.
Setting to a positive number may result in a backup very soon if some services are not backed up.
"""
if minutes <= 0:
Backups.disable_all_autobackup()
return
Storage.store_autobackup_period_minutes(minutes)
@staticmethod
def disable_all_autobackup():
"""disables all automatic backing up, but does not change per-service settings"""
Storage.delete_backup_period()
@staticmethod
def provider():
return Backups.lookup_provider()
@staticmethod
def set_provider(kind: str, login: str, key: str):
provider = Backups.construct_provider(kind, login, key)
Storage.store_provider(provider)
@staticmethod
def construct_provider(kind: str, login: str, key: str):
provider_class = get_provider(BackupProvider[kind])
if kind == "FILE":
path = Storage.get_testrepo_path()
return provider_class(path)
return provider_class(login=login, key=key)
@staticmethod
def reset():
Storage.reset()
@staticmethod
def lookup_provider() -> AbstractBackupProvider:
redis_provider = Backups.load_provider_redis()
if redis_provider is not None:
return redis_provider
json_provider = Backups.load_provider_json()
if json_provider is not None:
Storage.store_provider(json_provider)
return json_provider
memory_provider = Backups.construct_provider("MEMORY", login="", key="")
Storage.store_provider(memory_provider)
return memory_provider
@staticmethod
def load_provider_json() -> AbstractBackupProvider:
with ReadUserData() as user_data:
account = ""
key = ""
if "backup" not in user_data.keys():
if "backblaze" in user_data.keys():
account = user_data["backblaze"]["accountId"]
key = user_data["backblaze"]["accountKey"]
provider_string = "BACKBLAZE"
return Backups.construct_provider(
kind=provider_string, login=account, key=key
)
return None
account = user_data["backup"]["accountId"]
key = user_data["backup"]["accountKey"]
provider_string = user_data["backup"]["provider"]
return Backups.construct_provider(
kind=provider_string, login=account, key=key
)
@staticmethod
def load_provider_redis() -> AbstractBackupProvider:
provider_model = Storage.load_provider()
if provider_model is None:
return None
return Backups.construct_provider(
provider_model.kind, provider_model.login, provider_model.key
)
@staticmethod
def back_up(service: Service):
"""The top-level function to back up a service"""
folder = service.get_location()
repo_name = service.get_id()
service.pre_backup()
snapshot = Backups.provider().backuper.start_backup(folder, repo_name)
Backups._store_last_snapshot(repo_name, snapshot)
service.post_restore()
@staticmethod
def init_repo(service: Service):
repo_name = service.get_id()
Backups.provider().backuper.init(repo_name)
Storage.mark_as_init(service)
@staticmethod
def is_initted(service: Service) -> bool:
repo_name = service.get_id()
if Storage.has_init_mark(service):
return True
initted = Backups.provider().backuper.is_initted(repo_name)
if initted:
Storage.mark_as_init(service)
return True
return False
@staticmethod
def get_snapshots(service: Service) -> List[Snapshot]:
service_id = service.get_id()
cached_snapshots = Backups.get_cached_snapshots_service(service_id)
if cached_snapshots != []:
return cached_snapshots
# TODO: the oldest snapshots will get expired faster than the new ones.
# How to detect that the end is missing?
upstream_snapshots = Backups.provider().backuper.get_snapshots(service_id)
Backups.sync_service_snapshots(service_id, upstream_snapshots)
return upstream_snapshots
@staticmethod
def restore_service_from_snapshot(service: Service, snapshot_id: str):
repo_name = service.get_id()
folder = service.get_location()
Backups.provider().backuper.restore_from_backup(repo_name, snapshot_id, folder)
# Our dummy service is not yet globally registered so this is not testable yet
@staticmethod
def restore_snapshot(snapshot: Snapshot):
Backups.restore_service_from_snapshot(
get_service_by_id(snapshot.service_name), snapshot.id
)
@staticmethod
def service_snapshot_size(service: Service, snapshot_id: str) -> float:
repo_name = service.get_id()
return Backups.provider().backuper.restored_size(repo_name, snapshot_id)
# Our dummy service is not yet globally registered so this is not testable yet
@staticmethod
def snapshot_restored_size(snapshot: Snapshot) -> float:
return Backups.service_snapshot_size(
get_service_by_id(snapshot.service_name), snapshot.id
)
@staticmethod
def _store_last_snapshot(service_id: str, snapshot: Snapshot):
"""What do we do with a snapshot that is just made?"""
# non-expiring timestamp of the last
Storage.store_last_timestamp(service_id, snapshot)
# expiring cache entry
Storage.cache_snapshot(snapshot)