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123 lines
3.6 KiB
123 lines
3.6 KiB
#
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# Copyright (C) 2015 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import psutil
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import platform
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from .project import Project
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from uuid import UUID
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from gns3server.compute.compute_error import ComputeError, ComputeNotFoundError
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import logging
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log = logging.getLogger(__name__)
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class ProjectManager:
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"""
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This singleton keeps track of available projects.
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"""
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def __init__(self):
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self._projects = {}
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@classmethod
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def instance(cls):
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"""
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Singleton to return only one instance of ProjectManager.
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:returns: instance of ProjectManager
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"""
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if not hasattr(cls, "_instance"):
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cls._instance = cls()
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return cls._instance
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@property
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def projects(self):
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"""
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Returns all projects.
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:returns: Project instances
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"""
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return self._projects.values()
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def get_project(self, project_id):
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"""
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Returns a Project instance.
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:param project_id: Project identifier
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:returns: Project instance
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"""
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try:
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UUID(project_id, version=4)
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except ValueError:
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raise ComputeError(f"Project ID {project_id} is not a valid UUID")
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if project_id not in self._projects:
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raise ComputeNotFoundError(f"Project ID {project_id} doesn't exist")
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return self._projects[project_id]
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def _check_available_disk_space(self, project):
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"""
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Sends a warning notification if disk space is getting low.
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:param project: project instance
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"""
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try:
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used_disk_space = psutil.disk_usage(project.path).percent
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except FileNotFoundError:
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log.warning(f"Could not find '{project.path}' when checking for used disk space")
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return
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# send a warning if used disk space is >= 90%
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if used_disk_space >= 90:
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message = 'Only {:.2f}% or less of free disk space detected in "{}" on "{}"'.format(
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100 - used_disk_space, project.path, platform.node()
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)
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log.warning(message)
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project.emit("log.warning", {"message": message})
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def create_project(self, name=None, project_id=None, path=None, variables=None):
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"""
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Create a project and keep a references to it in project manager.
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See documentation of Project for arguments
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"""
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if project_id is not None and project_id in self._projects:
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return self._projects[project_id]
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project = Project(name=name, project_id=project_id, path=path, variables=variables)
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self._check_available_disk_space(project)
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self._projects[project.id] = project
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return project
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def remove_project(self, project_id):
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"""
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Removes a Project instance from the list of projects in use.
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:param project_id: Project identifier
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"""
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if project_id not in self._projects:
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raise ComputeNotFoundError(f"Project ID {project_id} doesn't exist")
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del self._projects[project_id]
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