257 lines
8.3 KiB
Python
257 lines
8.3 KiB
Python
import subprocess
|
|
import json
|
|
import datetime
|
|
|
|
from typing import List
|
|
from collections.abc import Iterable
|
|
|
|
from selfprivacy_api.backup.backuper import AbstractBackuper
|
|
from selfprivacy_api.models.backup.snapshot import Snapshot
|
|
|
|
from selfprivacy_api.backup.local_secret import LocalBackupSecret
|
|
|
|
|
|
class ResticBackuper(AbstractBackuper):
|
|
def __init__(self, login_flag: str, key_flag: str, type: str):
|
|
self.login_flag = login_flag
|
|
self.key_flag = key_flag
|
|
self.type = type
|
|
self.account = ""
|
|
self.key = ""
|
|
|
|
def set_creds(self, account: str, key: str):
|
|
self.account = account
|
|
self.key = key
|
|
|
|
def restic_repo(self, repository_name: str) -> str:
|
|
# https://restic.readthedocs.io/en/latest/030_preparing_a_new_repo.html#other-services-via-rclone
|
|
# https://forum.rclone.org/t/can-rclone-be-run-solely-with-command-line-options-no-config-no-env-vars/6314/5
|
|
return f"rclone:{self.type}{repository_name}/sfbackup"
|
|
|
|
def rclone_args(self):
|
|
return "rclone.args=serve restic --stdio" + self.backend_rclone_args()
|
|
|
|
def backend_rclone_args(self) -> str:
|
|
acc_arg = ""
|
|
key_arg = ""
|
|
if self.account != "":
|
|
acc_arg = f"{self.login_flag} {self.account}"
|
|
if self.key != "":
|
|
key_arg = f"{self.key_flag} {self.key}"
|
|
|
|
return f"{acc_arg} {key_arg}"
|
|
|
|
def _password_command(self):
|
|
return f"echo {LocalBackupSecret.get()}"
|
|
|
|
def restic_command(self, repo_name: str, *args):
|
|
command = [
|
|
"restic",
|
|
"-o",
|
|
self.rclone_args(),
|
|
"-r",
|
|
self.restic_repo(repo_name),
|
|
"--password-command",
|
|
self._password_command(),
|
|
]
|
|
if args != []:
|
|
command.extend(ResticBackuper.__flatten_list(args))
|
|
return command
|
|
|
|
@staticmethod
|
|
def __flatten_list(list):
|
|
"""string-aware list flattener"""
|
|
result = []
|
|
for item in list:
|
|
if isinstance(item, Iterable) and not isinstance(item, str):
|
|
result.extend(ResticBackuper.__flatten_list(item))
|
|
continue
|
|
result.append(item)
|
|
return result
|
|
|
|
def start_backup(self, folders: List[str], repo_name: str):
|
|
"""
|
|
Start backup with restic
|
|
"""
|
|
|
|
# but maybe it is ok to accept a union of a string and an array of strings
|
|
assert not isinstance(folders, str)
|
|
|
|
backup_command = self.restic_command(
|
|
repo_name,
|
|
"backup",
|
|
"--json",
|
|
folders,
|
|
)
|
|
with subprocess.Popen(
|
|
backup_command,
|
|
shell=False,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.STDOUT,
|
|
) as handle:
|
|
output = handle.communicate()[0].decode("utf-8")
|
|
try:
|
|
messages = self.parse_json_output(output)
|
|
return ResticBackuper._snapshot_from_backup_messages(
|
|
messages, repo_name
|
|
)
|
|
except ValueError as e:
|
|
raise ValueError("could not create a snapshot: ") from e
|
|
|
|
@staticmethod
|
|
def _snapshot_from_backup_messages(messages, repo_name) -> Snapshot:
|
|
for message in messages:
|
|
if message["message_type"] == "summary":
|
|
return ResticBackuper._snapshot_from_fresh_summary(message, repo_name)
|
|
raise ValueError("no summary message in restic json output")
|
|
|
|
@staticmethod
|
|
def _snapshot_from_fresh_summary(message: object, repo_name) -> Snapshot:
|
|
return Snapshot(
|
|
id=message["snapshot_id"],
|
|
created_at=datetime.datetime.now(datetime.timezone.utc),
|
|
service_name=repo_name,
|
|
)
|
|
|
|
def init(self, repo_name):
|
|
init_command = self.restic_command(
|
|
repo_name,
|
|
"init",
|
|
)
|
|
with subprocess.Popen(
|
|
init_command,
|
|
shell=False,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.STDOUT,
|
|
) as process_handle:
|
|
output = process_handle.communicate()[0].decode("utf-8")
|
|
if not "created restic repository" in output:
|
|
raise ValueError("cannot init a repo: " + output)
|
|
|
|
def is_initted(self, repo_name: str) -> bool:
|
|
command = self.restic_command(
|
|
repo_name,
|
|
"check",
|
|
"--json",
|
|
)
|
|
|
|
with subprocess.Popen(command, stdout=subprocess.PIPE, shell=False) as handle:
|
|
output = handle.communicate()[0].decode("utf-8")
|
|
if not self.has_json(output):
|
|
return False
|
|
# raise NotImplementedError("error(big): " + output)
|
|
return True
|
|
|
|
def restored_size(self, repo_name, snapshot_id) -> float:
|
|
"""
|
|
Size of a snapshot
|
|
"""
|
|
command = self.restic_command(
|
|
repo_name,
|
|
"stats",
|
|
snapshot_id,
|
|
"--json",
|
|
)
|
|
|
|
with subprocess.Popen(command, stdout=subprocess.PIPE, shell=False) as handle:
|
|
output = handle.communicate()[0].decode("utf-8")
|
|
try:
|
|
parsed_output = self.parse_json_output(output)
|
|
return parsed_output["total_size"]
|
|
except ValueError as e:
|
|
raise ValueError("cannot restore a snapshot: " + output) from e
|
|
|
|
def restore_from_backup(self, repo_name, snapshot_id, folders):
|
|
"""
|
|
Restore from backup with restic
|
|
"""
|
|
# snapshots save the path of the folder in the file system
|
|
# I do not alter the signature yet because maybe this can be
|
|
# changed with flags
|
|
restore_command = self.restic_command(
|
|
repo_name,
|
|
"restore",
|
|
snapshot_id,
|
|
"--target",
|
|
"/",
|
|
)
|
|
|
|
with subprocess.Popen(
|
|
restore_command, stdout=subprocess.PIPE, shell=False
|
|
) as handle:
|
|
|
|
output = handle.communicate()[0].decode("utf-8")
|
|
if "restoring" not in output:
|
|
raise ValueError("cannot restore a snapshot: " + output)
|
|
|
|
def _load_snapshots(self, repo_name) -> object:
|
|
"""
|
|
Load list of snapshots from repository
|
|
raises Value Error if repo does not exist
|
|
"""
|
|
listing_command = self.restic_command(
|
|
repo_name,
|
|
"snapshots",
|
|
"--json",
|
|
)
|
|
|
|
with subprocess.Popen(
|
|
listing_command,
|
|
shell=False,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.STDOUT,
|
|
) as backup_listing_process_descriptor:
|
|
output = backup_listing_process_descriptor.communicate()[0].decode("utf-8")
|
|
|
|
if "Is there a repository at the following location?" in output:
|
|
raise ValueError("No repository! : " + output)
|
|
try:
|
|
return self.parse_json_output(output)
|
|
except ValueError as e:
|
|
raise ValueError("Cannot load snapshots: ") from e
|
|
|
|
def get_snapshots(self, repo_name) -> List[Snapshot]:
|
|
"""Get all snapshots from the repo"""
|
|
snapshots = []
|
|
for restic_snapshot in self._load_snapshots(repo_name):
|
|
snapshot = Snapshot(
|
|
id=restic_snapshot["short_id"],
|
|
created_at=restic_snapshot["time"],
|
|
service_name=repo_name,
|
|
)
|
|
|
|
snapshots.append(snapshot)
|
|
return snapshots
|
|
|
|
def parse_json_output(self, output: str) -> object:
|
|
starting_index = self.json_start(output)
|
|
|
|
if starting_index == -1:
|
|
raise ValueError("There is no json in the restic output : " + output)
|
|
|
|
truncated_output = output[starting_index:]
|
|
json_messages = truncated_output.splitlines()
|
|
if len(json_messages) == 1:
|
|
return json.loads(truncated_output)
|
|
|
|
result_array = []
|
|
for message in json_messages:
|
|
result_array.append(json.loads(message))
|
|
return result_array
|
|
|
|
def json_start(self, output: str) -> int:
|
|
indices = [
|
|
output.find("["),
|
|
output.find("{"),
|
|
]
|
|
indices = [x for x in indices if x != -1]
|
|
|
|
if indices == []:
|
|
return -1
|
|
return min(indices)
|
|
|
|
def has_json(self, output: str) -> bool:
|
|
if self.json_start(output) == -1:
|
|
return False
|
|
return True
|