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gns3-server/gns3server/compute/project_manager.py

138 lines
4.3 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
import asyncio
import psutil
import platform
from .project import Project
from uuid import UUID
import logging
log = logging.getLogger(__name__)
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 _check_available_disk_space(self, project):
"""
Sends a warning notification if disk space is getting low.
:param project: project instance
"""
try:
used_disk_space = psutil.disk_usage(project.path).percent
except FileNotFoundError:
log.warning('Could not find "{}" when checking for used disk space'.format(project.path))
return
# send a warning if used disk space is >= 90%
if used_disk_space >= 90:
message = 'Only {:.2f}% or less of free disk space detected in "{}" on "{}"'.format(100 - used_disk_space,
project.path,
platform.node())
log.warning(message)
project.emit("log.warning", {"message": message})
def create_project(self, name=None, project_id=None, path=None, variables=None):
"""
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]
project = Project(name=name, project_id=project_id,
path=path, variables=variables)
self._check_available_disk_space(project)
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]
def check_hardware_virtualization(self, source_node):
"""
Checks if hardware virtualization can be used.
:returns: boolean
"""
for project in self._projects.values():
for node in project.nodes:
if node == source_node:
continue
if node.hw_virtualization and node.__class__.__name__ != source_node.__class__.__name__:
return False
return True