mirror of
https://git.selfprivacy.org/SelfPrivacy/selfprivacy-rest-api.git
synced 2024-09-11 20:27:19 +00:00
619 lines
19 KiB
Python
619 lines
19 KiB
Python
"""
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This module contains the controller class for backups.
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"""
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from datetime import datetime, timedelta
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import os
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from os import statvfs
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from typing import List, Optional
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from selfprivacy_api.utils import ReadUserData, WriteUserData
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from selfprivacy_api.services import (
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get_service_by_id,
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get_all_services,
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)
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from selfprivacy_api.services.service import (
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Service,
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ServiceStatus,
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StoppedService,
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)
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from selfprivacy_api.jobs import Jobs, JobStatus, Job
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from selfprivacy_api.graphql.queries.providers import (
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BackupProvider as BackupProviderEnum,
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)
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from selfprivacy_api.graphql.common_types.backup import RestoreStrategy
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from selfprivacy_api.models.backup.snapshot import Snapshot
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from selfprivacy_api.backup.providers.provider import AbstractBackupProvider
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from selfprivacy_api.backup.providers import get_provider
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from selfprivacy_api.backup.storage import Storage
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from selfprivacy_api.backup.jobs import (
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get_backup_job,
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add_backup_job,
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get_restore_job,
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add_restore_job,
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)
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DEFAULT_JSON_PROVIDER = {
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"provider": "BACKBLAZE",
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"accountId": "",
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"accountKey": "",
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"bucket": "",
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}
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BACKUP_PROVIDER_ENVS = {
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"kind": "BACKUP_KIND",
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"login": "BACKUP_LOGIN",
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"key": "BACKUP_KEY",
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"location": "BACKUP_LOCATION",
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}
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class NotDeadError(AssertionError):
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"""
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This error is raised when we try to back up a service that is not dead yet.
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"""
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def __init__(self, service: Service):
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self.service_name = service.get_id()
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super().__init__()
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def __str__(self):
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return f"""
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Service {self.service_name} should be either stopped or dead from
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an error before we back up.
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Normally, this error is unreachable because we do try ensure this.
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Apparently, not this time.
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"""
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class Backups:
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"""A stateless controller class for backups"""
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# Providers
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@staticmethod
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def provider() -> AbstractBackupProvider:
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"""
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Returns the current backup storage provider.
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"""
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return Backups._lookup_provider()
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@staticmethod
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def set_provider(
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kind: BackupProviderEnum,
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login: str,
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key: str,
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location: str,
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repo_id: str = "",
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) -> None:
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"""
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Sets the new configuration of the backup storage provider.
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In case of `BackupProviderEnum.BACKBLAZE`, the `login` is the key ID,
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the `key` is the key itself, and the `location` is the bucket name and
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the `repo_id` is the bucket ID.
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"""
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provider: AbstractBackupProvider = Backups._construct_provider(
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kind,
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login,
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key,
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location,
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repo_id,
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)
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Storage.store_provider(provider)
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@staticmethod
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def reset(reset_json=True) -> None:
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"""
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Deletes all the data about the backup storage provider.
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"""
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Storage.reset()
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if reset_json:
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try:
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Backups._reset_provider_json()
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except FileNotFoundError:
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# if there is no userdata file, we do not need to reset it
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pass
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@staticmethod
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def _lookup_provider() -> AbstractBackupProvider:
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redis_provider = Backups._load_provider_redis()
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if redis_provider is not None:
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return redis_provider
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try:
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json_provider = Backups._load_provider_json()
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except FileNotFoundError:
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json_provider = None
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if json_provider is not None:
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Storage.store_provider(json_provider)
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return json_provider
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none_provider = Backups._construct_provider(
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BackupProviderEnum.NONE, login="", key="", location=""
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)
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Storage.store_provider(none_provider)
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return none_provider
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@staticmethod
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def set_provider_from_envs():
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for env in BACKUP_PROVIDER_ENVS.values():
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if env not in os.environ.keys():
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raise ValueError(
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f"Cannot set backup provider from envs, there is no {env} set"
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)
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kind_str = os.environ[BACKUP_PROVIDER_ENVS["kind"]]
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kind_enum = BackupProviderEnum[kind_str]
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provider = Backups._construct_provider(
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kind=kind_enum,
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login=os.environ[BACKUP_PROVIDER_ENVS["login"]],
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key=os.environ[BACKUP_PROVIDER_ENVS["key"]],
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location=os.environ[BACKUP_PROVIDER_ENVS["location"]],
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)
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Storage.store_provider(provider)
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@staticmethod
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def _construct_provider(
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kind: BackupProviderEnum,
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login: str,
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key: str,
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location: str,
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repo_id: str = "",
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) -> AbstractBackupProvider:
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provider_class = get_provider(kind)
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return provider_class(
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login=login,
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key=key,
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location=location,
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repo_id=repo_id,
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)
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@staticmethod
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def _load_provider_redis() -> Optional[AbstractBackupProvider]:
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provider_model = Storage.load_provider()
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if provider_model is None:
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return None
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return Backups._construct_provider(
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BackupProviderEnum[provider_model.kind],
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provider_model.login,
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provider_model.key,
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provider_model.location,
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provider_model.repo_id,
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)
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@staticmethod
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def _load_provider_json() -> Optional[AbstractBackupProvider]:
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with ReadUserData() as user_data:
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provider_dict = {
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"provider": "",
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"accountId": "",
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"accountKey": "",
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"bucket": "",
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}
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if "backup" not in user_data.keys():
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if "backblaze" in user_data.keys():
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provider_dict.update(user_data["backblaze"])
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provider_dict["provider"] = "BACKBLAZE"
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return None
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else:
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provider_dict.update(user_data["backup"])
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if provider_dict == DEFAULT_JSON_PROVIDER:
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return None
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try:
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return Backups._construct_provider(
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kind=BackupProviderEnum[provider_dict["provider"]],
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login=provider_dict["accountId"],
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key=provider_dict["accountKey"],
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location=provider_dict["bucket"],
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)
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except KeyError:
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return None
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@staticmethod
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def _reset_provider_json() -> None:
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with WriteUserData() as user_data:
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if "backblaze" in user_data.keys():
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del user_data["backblaze"]
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user_data["backup"] = DEFAULT_JSON_PROVIDER
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# Init
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@staticmethod
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def init_repo() -> None:
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"""
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Initializes the backup repository. This is required once per repo.
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"""
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Backups.provider().backupper.init()
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Storage.mark_as_init()
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@staticmethod
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def erase_repo() -> None:
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"""
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Completely empties the remote
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"""
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Backups.provider().backupper.erase_repo()
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Storage.mark_as_uninitted()
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@staticmethod
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def is_initted() -> bool:
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"""
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Returns whether the backup repository is initialized or not.
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If it is not initialized, we cannot back up and probably should
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call `init_repo` first.
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"""
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if Storage.has_init_mark():
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return True
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initted = Backups.provider().backupper.is_initted()
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if initted:
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Storage.mark_as_init()
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return True
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return False
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# Backup
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@staticmethod
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def back_up(service: Service) -> Snapshot:
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"""The top-level function to back up a service"""
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folders = service.get_folders()
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tag = service.get_id()
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job = get_backup_job(service)
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if job is None:
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job = add_backup_job(service)
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Jobs.update(job, status=JobStatus.RUNNING)
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try:
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service.pre_backup()
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snapshot = Backups.provider().backupper.start_backup(
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folders,
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tag,
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)
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Backups._store_last_snapshot(tag, snapshot)
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service.post_restore()
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except Exception as error:
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Jobs.update(job, status=JobStatus.ERROR, status_text=str(error))
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raise error
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Jobs.update(job, status=JobStatus.FINISHED)
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return snapshot
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# Restoring
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@staticmethod
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def _ensure_queued_restore_job(service, snapshot) -> Job:
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job = get_restore_job(service)
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if job is None:
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job = add_restore_job(snapshot)
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Jobs.update(job, status=JobStatus.CREATED)
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return job
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@staticmethod
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def _inplace_restore(
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service: Service,
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snapshot: Snapshot,
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job: Job,
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) -> None:
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Jobs.update(
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job, status=JobStatus.CREATED, status_text=f"Waiting for pre-restore backup"
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)
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failsafe_snapshot = Backups.back_up(service)
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Jobs.update(
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job, status=JobStatus.RUNNING, status_text=f"Restoring from {snapshot.id}"
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)
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try:
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Backups._restore_service_from_snapshot(
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service,
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snapshot.id,
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verify=False,
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)
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except Exception as error:
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Jobs.update(
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job,
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status=JobStatus.ERROR,
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status_text=f"Restore failed with {str(error)}, reverting to {failsafe_snapshot.id}",
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)
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Backups._restore_service_from_snapshot(
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service, failsafe_snapshot.id, verify=False
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)
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Jobs.update(
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job,
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status=JobStatus.ERROR,
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status_text=f"Restore failed with {str(error)}, reverted to {failsafe_snapshot.id}",
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)
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raise error
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@staticmethod
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def restore_snapshot(
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snapshot: Snapshot, strategy=RestoreStrategy.DOWNLOAD_VERIFY_OVERWRITE
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) -> None:
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"""Restores a snapshot to its original service using the given strategy"""
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service = get_service_by_id(snapshot.service_name)
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if service is None:
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raise ValueError(
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f"snapshot has a nonexistent service: {snapshot.service_name}"
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)
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job = Backups._ensure_queued_restore_job(service, snapshot)
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try:
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Backups._assert_restorable(snapshot)
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Jobs.update(
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job, status=JobStatus.RUNNING, status_text="Stopping the service"
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)
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with StoppedService(service):
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Backups.assert_dead(service)
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if strategy == RestoreStrategy.INPLACE:
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Backups._inplace_restore(service, snapshot, job)
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else: # verify_before_download is our default
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Jobs.update(
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job,
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status=JobStatus.RUNNING,
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status_text=f"Restoring from {snapshot.id}",
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)
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Backups._restore_service_from_snapshot(
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service, snapshot.id, verify=True
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)
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service.post_restore()
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Jobs.update(
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job,
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status=JobStatus.RUNNING,
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progress=90,
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status_text="Restarting the service",
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)
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except Exception as error:
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Jobs.update(job, status=JobStatus.ERROR, status_text=str(error))
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raise error
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Jobs.update(job, status=JobStatus.FINISHED)
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@staticmethod
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def _assert_restorable(
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snapshot: Snapshot, strategy=RestoreStrategy.DOWNLOAD_VERIFY_OVERWRITE
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) -> None:
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service = get_service_by_id(snapshot.service_name)
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if service is None:
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raise ValueError(
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f"snapshot has a nonexistent service: {snapshot.service_name}"
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)
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restored_snap_size = Backups.snapshot_restored_size(snapshot.id)
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if strategy == RestoreStrategy.DOWNLOAD_VERIFY_OVERWRITE:
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needed_space = restored_snap_size
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elif strategy == RestoreStrategy.INPLACE:
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needed_space = restored_snap_size - service.get_storage_usage()
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else:
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raise NotImplementedError(
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"""
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We do not know if there is enough space for restoration because
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there is some novel restore strategy used!
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This is a developer's fault, open an issue please
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"""
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)
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available_space = Backups.space_usable_for_service(service)
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if needed_space > available_space:
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raise ValueError(
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f"we only have {available_space} bytes "
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f"but snapshot needs {needed_space}"
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)
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@staticmethod
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def _restore_service_from_snapshot(
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service: Service,
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snapshot_id: str,
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verify=True,
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) -> None:
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folders = service.get_folders()
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Backups.provider().backupper.restore_from_backup(
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snapshot_id,
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folders,
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verify=verify,
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)
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# Snapshots
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@staticmethod
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def get_snapshots(service: Service) -> List[Snapshot]:
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"""Returns all snapshots for a given service"""
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snapshots = Backups.get_all_snapshots()
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service_id = service.get_id()
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return list(
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filter(
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lambda snap: snap.service_name == service_id,
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snapshots,
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)
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)
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@staticmethod
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def get_all_snapshots() -> List[Snapshot]:
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"""Returns all snapshots"""
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cached_snapshots = Storage.get_cached_snapshots()
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if cached_snapshots:
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return cached_snapshots
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# TODO: the oldest snapshots will get expired faster than the new ones.
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# How to detect that the end is missing?
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Backups.force_snapshot_cache_reload()
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return Storage.get_cached_snapshots()
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|
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@staticmethod
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def get_snapshot_by_id(snapshot_id: str) -> Optional[Snapshot]:
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"""Returns a backup snapshot by its id"""
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snap = Storage.get_cached_snapshot_by_id(snapshot_id)
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if snap is not None:
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return snap
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# Possibly our cache entry got invalidated, let's try one more time
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Backups.force_snapshot_cache_reload()
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snap = Storage.get_cached_snapshot_by_id(snapshot_id)
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return snap
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|
|
@staticmethod
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def forget_snapshot(snapshot: Snapshot) -> None:
|
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"""Deletes a snapshot from the repo and from cache"""
|
|
Backups.provider().backupper.forget_snapshot(snapshot.id)
|
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Storage.delete_cached_snapshot(snapshot)
|
|
|
|
@staticmethod
|
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def forget_all_snapshots():
|
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"""deliberately erase all snapshots we made"""
|
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# there is no dedicated optimized command for this,
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# but maybe we can have a multi-erase
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for snapshot in Backups.get_all_snapshots():
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Backups.forget_snapshot(snapshot)
|
|
|
|
@staticmethod
|
|
def force_snapshot_cache_reload() -> None:
|
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"""
|
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Forces a reload of the snapshot cache.
|
|
|
|
This may be an expensive operation, so use it wisely.
|
|
User pays for the API calls.
|
|
"""
|
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upstream_snapshots = Backups.provider().backupper.get_snapshots()
|
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Storage.invalidate_snapshot_storage()
|
|
for snapshot in upstream_snapshots:
|
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Storage.cache_snapshot(snapshot)
|
|
|
|
@staticmethod
|
|
def snapshot_restored_size(snapshot_id: str) -> int:
|
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"""Returns the size of the snapshot"""
|
|
return Backups.provider().backupper.restored_size(
|
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snapshot_id,
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)
|
|
|
|
@staticmethod
|
|
def _store_last_snapshot(service_id: str, snapshot: Snapshot) -> None:
|
|
"""What do we do with a snapshot that is just made?"""
|
|
# non-expiring timestamp of the last
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Storage.store_last_timestamp(service_id, snapshot)
|
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# expiring cache entry
|
|
Storage.cache_snapshot(snapshot)
|
|
|
|
# Autobackup
|
|
|
|
@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) -> None:
|
|
"""
|
|
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() -> None:
|
|
"""
|
|
Disables all automatic backing up,
|
|
but does not change per-service settings
|
|
"""
|
|
Storage.delete_backup_period()
|
|
|
|
@staticmethod
|
|
def is_time_to_backup(time: datetime) -> bool:
|
|
"""
|
|
Intended as a time validator for huey cron scheduler
|
|
of automatic backups
|
|
"""
|
|
|
|
return Backups.services_to_back_up(time) != []
|
|
|
|
@staticmethod
|
|
def services_to_back_up(time: datetime) -> List[Service]:
|
|
"""Returns a list of services that should be backed up at a given time"""
|
|
return [
|
|
service
|
|
for service in get_all_services()
|
|
if Backups.is_time_to_backup_service(service, time)
|
|
]
|
|
|
|
@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 is_time_to_backup_service(service: Service, time: datetime):
|
|
"""Returns True if it is time to back up a service"""
|
|
period = Backups.autobackup_period_minutes()
|
|
service_id = service.get_id()
|
|
if not service.can_be_backed_up():
|
|
return False
|
|
if period is None:
|
|
return False
|
|
|
|
last_backup = Storage.get_last_backup_time(service_id)
|
|
if last_backup is None:
|
|
# queue a backup immediately if there are no previous backups
|
|
return True
|
|
|
|
if time > last_backup + timedelta(minutes=period):
|
|
return True
|
|
return False
|
|
|
|
# Helpers
|
|
|
|
@staticmethod
|
|
def space_usable_for_service(service: Service) -> int:
|
|
"""
|
|
Returns the amount of space available on the volume the given
|
|
service is located on.
|
|
"""
|
|
folders = service.get_folders()
|
|
if folders == []:
|
|
raise ValueError("unallocated service", service.get_id())
|
|
|
|
# We assume all folders of one service live at the same volume
|
|
fs_info = statvfs(folders[0])
|
|
usable_bytes = fs_info.f_frsize * fs_info.f_bavail
|
|
return usable_bytes
|
|
|
|
@staticmethod
|
|
def set_localfile_repo(file_path: str):
|
|
"""Used by tests to set a local folder as a backup repo"""
|
|
# pylint: disable-next=invalid-name
|
|
ProviderClass = get_provider(BackupProviderEnum.FILE)
|
|
provider = ProviderClass(
|
|
login="",
|
|
key="",
|
|
location=file_path,
|
|
repo_id="",
|
|
)
|
|
Storage.store_provider(provider)
|
|
|
|
@staticmethod
|
|
def assert_dead(service: Service):
|
|
"""
|
|
Checks if a service is dead and can be safely restored from a snapshot.
|
|
"""
|
|
if service.get_status() not in [
|
|
ServiceStatus.INACTIVE,
|
|
ServiceStatus.FAILED,
|
|
]:
|
|
raise NotDeadError(service)
|