mirror of
https://git.selfprivacy.org/SelfPrivacy/selfprivacy-rest-api.git
synced 2024-11-15 23:23:17 +00:00
300 lines
9.7 KiB
Python
300 lines
9.7 KiB
Python
import subprocess
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import json
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import datetime
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from typing import List
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from collections.abc import Iterable
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from json.decoder import JSONDecodeError
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from selfprivacy_api.backup.backuppers import AbstractBackupper
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from selfprivacy_api.models.backup.snapshot import Snapshot
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from selfprivacy_api.backup.jobs import get_backup_job
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from selfprivacy_api.services import get_service_by_id
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from selfprivacy_api.jobs import Jobs, JobStatus
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from selfprivacy_api.backup.local_secret import LocalBackupSecret
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class ResticBackupper(AbstractBackupper):
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def __init__(self, login_flag: str, key_flag: str, type: str):
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self.login_flag = login_flag
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self.key_flag = key_flag
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self.type = type
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self.account = ""
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self.key = ""
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self.repo = ""
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def set_creds(self, account: str, key: str, repo: str):
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self.account = account
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self.key = key
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self.repo = repo
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def restic_repo(self) -> str:
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# https://restic.readthedocs.io/en/latest/030_preparing_a_new_repo.html#other-services-via-rclone
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# https://forum.rclone.org/t/can-rclone-be-run-solely-with-command-line-options-no-config-no-env-vars/6314/5
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return f"rclone:{self.type}{self.repo}"
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def rclone_args(self):
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return "rclone.args=serve restic --stdio " + self.backend_rclone_args()
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def backend_rclone_args(self) -> str:
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acc_arg = ""
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key_arg = ""
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if self.account != "":
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acc_arg = f"{self.login_flag} {self.account}"
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if self.key != "":
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key_arg = f"{self.key_flag} {self.key}"
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return f"{acc_arg} {key_arg}"
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def _password_command(self):
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return f"echo {LocalBackupSecret.get()}"
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def restic_command(self, *args, tag: str = ""):
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command = [
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"restic",
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"-o",
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self.rclone_args(),
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"-r",
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self.restic_repo(),
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"--password-command",
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self._password_command(),
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]
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if tag != "":
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command.extend(
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[
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"--tag",
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tag,
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]
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)
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if args != []:
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command.extend(ResticBackupper.__flatten_list(args))
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return command
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@staticmethod
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def __flatten_list(list):
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"""string-aware list flattener"""
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result = []
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for item in list:
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if isinstance(item, Iterable) and not isinstance(item, str):
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result.extend(ResticBackupper.__flatten_list(item))
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continue
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result.append(item)
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return result
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@staticmethod
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def output_yielder(command):
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with subprocess.Popen(
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command,
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shell=False,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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universal_newlines=True,
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) as handle:
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for line in iter(handle.stdout.readline, ""):
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if "NOTICE:" not in line:
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yield line
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def start_backup(self, folders: List[str], tag: str):
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"""
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Start backup with restic
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"""
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# but maybe it is ok to accept a union of a string and an array of strings
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assert not isinstance(folders, str)
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backup_command = self.restic_command(
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"backup",
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"--json",
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folders,
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tag=tag,
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)
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messages = []
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job = get_backup_job(get_service_by_id(tag))
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try:
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for raw_message in ResticBackupper.output_yielder(backup_command):
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message = self.parse_message(raw_message, job)
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messages.append(message)
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return ResticBackupper._snapshot_from_backup_messages(messages, tag)
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except ValueError as e:
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raise ValueError("could not create a snapshot: ", messages) from e
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@staticmethod
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def _snapshot_from_backup_messages(messages, repo_name) -> Snapshot:
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for message in messages:
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if message["message_type"] == "summary":
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return ResticBackupper._snapshot_from_fresh_summary(message, repo_name)
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raise ValueError("no summary message in restic json output")
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def parse_message(self, raw_message_line: str, job=None) -> dict:
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message = ResticBackupper.parse_json_output(raw_message_line)
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if not isinstance(message, dict):
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raise ValueError("we have too many messages on one line?")
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if message["message_type"] == "status":
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if job is not None: # only update status if we run under some job
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Jobs.update(
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job,
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JobStatus.RUNNING,
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progress=int(message["percent_done"] * 100),
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)
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return message
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@staticmethod
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def _snapshot_from_fresh_summary(message: dict, repo_name) -> Snapshot:
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return Snapshot(
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id=message["snapshot_id"],
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created_at=datetime.datetime.now(datetime.timezone.utc),
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service_name=repo_name,
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)
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def init(self):
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init_command = self.restic_command(
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"init",
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)
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with subprocess.Popen(
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init_command,
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shell=False,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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) as process_handle:
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output = process_handle.communicate()[0].decode("utf-8")
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if not "created restic repository" in output:
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raise ValueError("cannot init a repo: " + output)
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def is_initted(self) -> bool:
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command = self.restic_command(
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"check",
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"--json",
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)
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with subprocess.Popen(command, stdout=subprocess.PIPE, shell=False) as handle:
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output = handle.communicate()[0].decode("utf-8")
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if not ResticBackupper.has_json(output):
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return False
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# raise NotImplementedError("error(big): " + output)
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return True
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def restored_size(self, snapshot_id: str) -> int:
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"""
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Size of a snapshot
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"""
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command = self.restic_command(
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"stats",
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snapshot_id,
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"--json",
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)
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with subprocess.Popen(
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command,
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stdout=subprocess.PIPE,
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shell=False,
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) as handle:
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output = handle.communicate()[0].decode("utf-8")
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try:
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parsed_output = ResticBackupper.parse_json_output(output)
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return parsed_output["total_size"]
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except ValueError as e:
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raise ValueError("cannot restore a snapshot: " + output) from e
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def restore_from_backup(self, snapshot_id, folders):
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"""
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Restore from backup with restic
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"""
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# snapshots save the path of the folder in the file system
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# I do not alter the signature yet because maybe this can be
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# changed with flags
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restore_command = self.restic_command(
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"restore",
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snapshot_id,
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"--target",
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"/",
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)
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with subprocess.Popen(
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restore_command, stdout=subprocess.PIPE, shell=False
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) as handle:
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# for some reason restore does not support nice reporting of progress via json
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output = handle.communicate()[0].decode("utf-8")
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if "restoring" not in output:
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raise ValueError("cannot restore a snapshot: " + output)
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def _load_snapshots(self) -> object:
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"""
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Load list of snapshots from repository
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raises Value Error if repo does not exist
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"""
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listing_command = self.restic_command(
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"snapshots",
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"--json",
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)
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with subprocess.Popen(
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listing_command,
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shell=False,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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) as backup_listing_process_descriptor:
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output = backup_listing_process_descriptor.communicate()[0].decode("utf-8")
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if "Is there a repository at the following location?" in output:
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raise ValueError("No repository! : " + output)
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try:
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return ResticBackupper.parse_json_output(output)
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except ValueError as e:
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raise ValueError("Cannot load snapshots: ") from e
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def get_snapshots(self) -> List[Snapshot]:
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"""Get all snapshots from the repo"""
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snapshots = []
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for restic_snapshot in self._load_snapshots():
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snapshot = Snapshot(
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id=restic_snapshot["short_id"],
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created_at=restic_snapshot["time"],
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service_name=restic_snapshot["tags"][0],
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)
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snapshots.append(snapshot)
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return snapshots
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@staticmethod
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def parse_json_output(output: str) -> object:
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starting_index = ResticBackupper.json_start(output)
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if starting_index == -1:
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raise ValueError("There is no json in the restic output : " + output)
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truncated_output = output[starting_index:]
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json_messages = truncated_output.splitlines()
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if len(json_messages) == 1:
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try:
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return json.loads(truncated_output)
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except JSONDecodeError as e:
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raise ValueError(
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"There is no json in the restic output : " + output
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) from e
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result_array = []
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for message in json_messages:
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result_array.append(json.loads(message))
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return result_array
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@staticmethod
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def json_start(output: str) -> int:
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indices = [
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output.find("["),
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output.find("{"),
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]
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indices = [x for x in indices if x != -1]
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if indices == []:
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return -1
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return min(indices)
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@staticmethod
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def has_json(output: str) -> bool:
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if ResticBackupper.json_start(output) == -1:
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return False
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return True
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