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gns3-server/gns3server/modules/project_manager.py

98 lines
2.9 KiB
Python

# -*- coding: utf-8 -*-
#
# Copyright (C) 2015 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 aiohttp
from .project import Project
from uuid import UUID
class ProjectManager:
"""
This singleton keeps track of available projects.
"""
def __init__(self):
self._projects = {}
@classmethod
def instance(cls):
"""
Singleton to return only one instance of ProjectManager.
:returns: instance of ProjectManager
"""
if not hasattr(cls, "_instance"):
cls._instance = cls()
return cls._instance
@property
def projects(self):
"""
Returns all projects.
:returns: Project instances
"""
return self._projects.values()
def get_project(self, project_id):
"""
Returns a Project instance.
:param project_id: Project identifier
:returns: Project instance
"""
try:
UUID(project_id, version=4)
except ValueError:
raise aiohttp.web.HTTPBadRequest(text="Project ID {} is not a valid UUID".format(project_id))
if project_id not in self._projects:
raise aiohttp.web.HTTPNotFound(text="Project ID {} doesn't exist".format(project_id))
return self._projects[project_id]
def create_project(self, name=None, project_id=None, path=None, temporary=False):
"""
Create a project and keep a references to it in project manager.
See documentation of Project for arguments
"""
if project_id is not None and project_id in self._projects:
return self._projects[project_id]
# FIXME: should we have an error?
#raise aiohttp.web.HTTPConflict(text="Project ID {} is already in use on this server".format(project_id))
project = Project(name=name, project_id=project_id, path=path, temporary=temporary)
self._projects[project.id] = project
return project
def remove_project(self, project_id):
"""
Removes a Project instance from the list of projects in use.
:param project_id: Project identifier
"""
if project_id not in self._projects:
raise aiohttp.web.HTTPNotFound(text="Project ID {} doesn't exist".format(project_id))
del self._projects[project_id]