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gns3-server/gns3server/controller/snapshot.py

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#!/usr/bin/env python
#
# Copyright (C) 2016 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import uuid
import shutil
import asyncio
from datetime import datetime, timezone
from .import_project import import_project
# The string use to extract the date from the filename
FILENAME_TIME_FORMAT = "%d%m%y_%H%M%S"
class Snapshot:
"""
A snapshot object
"""
def __init__(self, project, name=None, filename=None):
assert filename or name, "You need to pass a name or a filename"
self._id = str(uuid.uuid4()) # We don't need to keep id between project loading because they are use only as key for operation like delete, update.. but have no impact on disk
self._project = project
if name:
self._name = name
self._created_at = datetime.now().timestamp()
filename = self._name + "_" + datetime.utcfromtimestamp(self._created_at).replace(tzinfo=None).strftime(FILENAME_TIME_FORMAT) + ".gns3project"
else:
self._name = filename.split("_")[0]
datestring = filename.replace(self._name + "_", "").split(".")[0]
try:
self._created_at = datetime.strptime(datestring, FILENAME_TIME_FORMAT).replace(tzinfo=timezone.utc).timestamp()
except ValueError:
self._created_at = datetime.utcnow().timestamp()
self._path = os.path.join(project.path, "snapshots", filename)
@property
def id(self):
return self._id
@property
def name(self):
return self._name
@property
def path(self):
return self._path
@property
def created_at(self):
return int(self._created_at)
@asyncio.coroutine
def restore(self):
"""
Restore the snapshot
"""
yield from self._project.delete_on_computes()
# We don't send close notif to clients because the close / open dance is purely internal
yield from self._project.close(ignore_notification=True)
self._project.controller.notification.emit("snapshot.restored", self.__json__())
shutil.rmtree(os.path.join(self._project.path, "project-files"))
with open(self._path, "rb") as f:
project = yield from import_project(self._project.controller, self._project.id, f, location=self._project.path)
yield from project.open()
return project
def __json__(self):
return {
"snapshot_id": self._id,
"name": self._name,
"created_at": int(self._created_at),
"project_id": self._project.id
}