mirror of
https://github.com/GNS3/gns3-server
synced 2024-12-01 04:38:12 +00:00
456 lines
19 KiB
Python
456 lines
19 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (C) 2019 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 os
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import json
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import asyncio
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import aiofiles
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from typing import Tuple, List
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from aiohttp.client_exceptions import ClientError
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from uuid import UUID
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from pydantic import ValidationError
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from .appliance import Appliance
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from ..config import Config
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from ..utils.asyncio import locking
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from ..utils.get_resource import get_resource
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from ..utils.http_client import HTTPClient
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from .controller_error import ControllerBadRequestError, ControllerNotFoundError, ControllerError
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from .appliance_to_template import ApplianceToTemplate
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from ..utils.images import InvalidImageError, write_image, md5sum
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from ..utils.asyncio import wait_run_in_executor
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from gns3server import schemas
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from gns3server.utils.images import default_images_directory
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from gns3server.db.repositories.images import ImagesRepository
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from gns3server.db.repositories.templates import TemplatesRepository
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from gns3server.services.templates import TemplatesService
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from gns3server.db.repositories.rbac import RbacRepository
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import logging
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log = logging.getLogger(__name__)
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class ApplianceManager:
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"""
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Manages appliances
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"""
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def __init__(self):
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self._appliances = {}
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self._appliances_etag = None
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@property
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def appliances_etag(self) -> str:
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"""
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:returns: ETag for downloaded appliances
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"""
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return self._appliances_etag
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@appliances_etag.setter
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def appliances_etag(self, etag):
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"""
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:param etag: ETag for downloaded appliances
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"""
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self._appliances_etag = etag
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@property
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def appliances(self) -> dict:
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"""
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:returns: The dictionary of appliances managed by GNS3
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"""
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return self._appliances
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def appliances_path(self) -> str:
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"""
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Get the image storage directory
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"""
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server_config = Config.instance().settings.Server
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appliances_path = os.path.expanduser(server_config.appliances_path)
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os.makedirs(appliances_path, exist_ok=True)
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return appliances_path
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def _find_appliances_from_image_checksum(self, image_checksum: str) -> List[Tuple[Appliance, str]]:
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"""
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Find appliances that matches an image checksum.
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"""
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appliances = []
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for appliance in self._appliances.values():
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if appliance.images:
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for image in appliance.images:
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if image.get("md5sum") == image_checksum:
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appliances.append((appliance, image.get("version")))
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return appliances
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async def _download_image(
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self,
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image_dir: str,
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image_name: str,
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image_type: str,
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image_url: str,
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images_repo: ImagesRepository
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) -> None:
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"""
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Download an image.
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"""
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log.info(f"Downloading image '{image_name}' from '{image_url}'")
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image_path = os.path.join(image_dir, image_name)
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try:
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async with HTTPClient.get(image_url) as response:
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if response.status != 200:
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raise ControllerError(f"Could not download '{image_name}' due to HTTP error code {response.status}")
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await write_image(image_name, image_path, response.content.iter_any(), images_repo, allow_raw_image=True)
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except (OSError, InvalidImageError) as e:
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raise ControllerError(f"Could not save {image_type} image '{image_path}': {e}")
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except ClientError as e:
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raise ControllerError(f"Could not connect to download '{image_name}': {e}")
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except asyncio.TimeoutError:
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raise ControllerError(f"Timeout while downloading '{image_name}' from '{image_url}'")
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async def _find_appliance_version_images(
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self,
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appliance: Appliance,
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version: dict,
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images_repo: ImagesRepository,
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image_dir: str
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) -> None:
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"""
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Find all the images belonging to a specific appliance version.
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"""
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version_images = version.get("images")
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if version_images:
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for appliance_key, appliance_file in version_images.items():
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for image in appliance.images:
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if appliance_file == image.get("filename"):
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image_checksum = image.get("md5sum")
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image_in_db = await images_repo.get_image_by_checksum(image_checksum)
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if image_in_db:
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version_images[appliance_key] = image_in_db.filename
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else:
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# check if the image is on disk
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# FIXME: still necessary? the image should have been discovered and saved in the db already
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image_path = os.path.join(image_dir, appliance_file)
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if os.path.exists(image_path) and \
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await wait_run_in_executor(
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md5sum,
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image_path,
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cache_to_md5file=False
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) == image_checksum:
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async with aiofiles.open(image_path, "rb") as f:
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await write_image(appliance_file, image_path, f, images_repo, allow_raw_image=True)
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else:
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# download the image if there is a direct download URL
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direct_download_url = image.get("direct_download_url")
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if direct_download_url:
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await self._download_image(
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image_dir,
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appliance_file,
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appliance.type,
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direct_download_url,
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images_repo)
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else:
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raise ControllerError(f"Could not find '{appliance_file}'")
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async def _create_template(self, template_data, templates_repo, rbac_repo, current_user):
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"""
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Create a new template
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"""
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try:
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template_create = schemas.TemplateCreate(**template_data)
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except ValidationError as e:
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raise ControllerError(message=f"Could not validate template data: {e}")
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template = await TemplatesService(templates_repo).create_template(template_create)
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template_id = template.get("template_id")
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await rbac_repo.add_permission_to_user_with_path(current_user.user_id, f"/templates/{template_id}/*")
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log.info(f"Template '{template.get('name')}' has been created")
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async def _appliance_to_template(self, appliance: Appliance, version: str = None) -> dict:
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"""
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Get template data from appliance
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"""
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from . import Controller
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# downloading missing custom symbol for this appliance
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if appliance.symbol and not appliance.symbol.startswith(":/symbols/"):
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destination_path = os.path.join(Controller.instance().symbols.symbols_path(), appliance.symbol)
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if not os.path.exists(destination_path):
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await self._download_symbol(appliance.symbol, destination_path)
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return ApplianceToTemplate().new_template(appliance.asdict(), version, "local") # FIXME: "local"
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async def install_appliances_from_image(
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self,
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image_path: str,
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image_checksum: str,
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images_repo: ImagesRepository,
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templates_repo: TemplatesRepository,
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rbac_repo: RbacRepository,
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current_user: schemas.User,
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image_dir: str
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) -> None:
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"""
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Install appliances using an image checksum
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"""
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appliances_info = self._find_appliances_from_image_checksum(image_checksum)
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for appliance, image_version in appliances_info:
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try:
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schemas.Appliance.parse_obj(appliance.asdict())
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except ValidationError as e:
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log.warning(f"Could not validate appliance '{appliance.id}': {e}")
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if appliance.versions:
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for version in appliance.versions:
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if version.get("name") == image_version:
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try:
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await self._find_appliance_version_images(appliance, version, images_repo, image_dir)
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template_data = await self._appliance_to_template(appliance, version)
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await self._create_template(template_data, templates_repo, rbac_repo, current_user)
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except (ControllerError, InvalidImageError) as e:
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log.warning(f"Could not automatically create template using image '{image_path}': {e}")
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async def install_appliance(
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self,
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appliance_id: UUID,
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version: str,
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images_repo: ImagesRepository,
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templates_repo: TemplatesRepository,
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rbac_repo: RbacRepository,
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current_user: schemas.User
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) -> None:
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"""
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Install a new appliance
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"""
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appliance = self._appliances.get(str(appliance_id))
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if not appliance:
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raise ControllerNotFoundError(message=f"Could not find appliance '{appliance_id}'")
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try:
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schemas.Appliance.parse_obj(appliance.asdict())
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except ValidationError as e:
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raise ControllerError(message=f"Could not validate appliance '{appliance_id}': {e}")
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if version:
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if not appliance.versions:
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raise ControllerBadRequestError(message=f"Appliance '{appliance_id}' do not have versions")
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image_dir = default_images_directory(appliance.type)
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for appliance_version_info in appliance.versions:
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if appliance_version_info.get("name") == version:
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try:
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await self._find_appliance_version_images(appliance, appliance_version_info, images_repo, image_dir)
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except InvalidImageError as e:
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raise ControllerError(message=f"Image error: {e}")
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template_data = await self._appliance_to_template(appliance, appliance_version_info)
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return await self._create_template(template_data, templates_repo, rbac_repo, current_user)
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raise ControllerNotFoundError(message=f"Could not find version '{version}' in appliance '{appliance_id}'")
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else:
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if appliance.versions:
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# TODO: install appliance versions based on available images
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raise ControllerBadRequestError(message=f"Selecting a version is required to install "
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f"appliance '{appliance_id}'")
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template_data = await self._appliance_to_template(appliance)
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await self._create_template(template_data, templates_repo, rbac_repo, current_user)
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def load_appliances(self, symbol_theme: str = None) -> None:
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"""
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Loads appliance files from disk.
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"""
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self._appliances = {}
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for directory, builtin in (
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(
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get_resource("appliances"),
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True,
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),
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(
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self.appliances_path(),
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False,
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),
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):
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if directory and os.path.isdir(directory):
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for file in os.listdir(directory):
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if not file.endswith(".gns3a") and not file.endswith(".gns3appliance"):
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continue
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path = os.path.join(directory, file)
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try:
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with open(path, encoding="utf-8") as f:
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appliance = Appliance(path, json.load(f), builtin=builtin)
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json_data = appliance.asdict() # Check if loaded without error
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if appliance.status != "broken":
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schemas.Appliance.parse_obj(json_data)
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self._appliances[appliance.id] = appliance
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if not appliance.symbol or appliance.symbol.startswith(":/symbols/"):
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# apply a default symbol if the appliance has none or a default symbol
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default_symbol = self._get_default_symbol(json_data, symbol_theme)
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if default_symbol:
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appliance.symbol = default_symbol
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except (ValueError, OSError, KeyError, ValidationError) as e:
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print(f"Cannot load appliance file '{path}': {e}")
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continue
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def _get_default_symbol(self, appliance: dict, symbol_theme: str) -> str:
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"""
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Returns the default symbol for a given appliance.
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"""
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from . import Controller
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controller = Controller.instance()
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if not symbol_theme:
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symbol_theme = controller.symbols.theme
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category = appliance["category"]
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if category == "guest":
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if "docker" in appliance:
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return controller.symbols.get_default_symbol("docker_guest", symbol_theme)
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elif "qemu" in appliance:
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return controller.symbols.get_default_symbol("qemu_guest", symbol_theme)
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return controller.symbols.get_default_symbol(category, symbol_theme)
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async def download_custom_symbols(self) -> None:
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"""
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Download custom appliance symbols from our GitHub registry repository.
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"""
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from . import Controller
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symbol_dir = Controller.instance().symbols.symbols_path()
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self.load_appliances()
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for appliance in self._appliances.values():
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symbol = appliance.symbol
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if symbol and not symbol.startswith(":/symbols/"):
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destination_path = os.path.join(symbol_dir, symbol)
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if not os.path.exists(destination_path):
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await self._download_symbol(symbol, destination_path)
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# refresh the symbol cache
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Controller.instance().symbols.list()
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async def _download_symbol(self, symbol: str, destination_path: str) -> None:
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"""
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Download a custom appliance symbol from our GitHub registry repository.
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"""
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symbol_url = f"https://raw.githubusercontent.com/GNS3/gns3-registry/master/symbols/{symbol}"
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log.info(f"Downloading symbol '{symbol}'")
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async with HTTPClient.get(symbol_url) as response:
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if response.status != 200:
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log.warning(
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f"Could not retrieve appliance symbol {symbol} from GitHub due to HTTP error code {response.status}"
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)
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else:
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try:
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symbol_data = await response.read()
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log.info(f"Saving {symbol} symbol to {destination_path}")
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with open(destination_path, "wb") as f:
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f.write(symbol_data)
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except asyncio.TimeoutError:
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log.warning(f"Timeout while downloading '{symbol_url}'")
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except OSError as e:
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log.warning(f"Could not write appliance symbol '{destination_path}': {e}")
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@locking
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async def download_appliances(self) -> None:
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"""
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Downloads appliance files from GitHub registry repository.
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"""
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try:
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headers = {}
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if self._appliances_etag:
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log.info(f"Checking if appliances are up-to-date (ETag {self._appliances_etag})")
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headers["If-None-Match"] = self._appliances_etag
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async with HTTPClient.get(
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"https://api.github.com/repos/GNS3/gns3-registry/contents/appliances", headers=headers
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) as response:
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if response.status == 304:
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log.info(f"Appliances are already up-to-date (ETag {self._appliances_etag})")
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return
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elif response.status != 200:
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raise ControllerError(
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f"Could not retrieve appliances from GitHub due to HTTP error code {response.status}"
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)
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etag = response.headers.get("ETag")
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if etag:
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self._appliances_etag = etag
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from . import Controller
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Controller.instance().save()
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json_data = await response.json()
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appliances_dir = get_resource("appliances")
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downloaded_appliance_files = []
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for appliance in json_data:
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if appliance["type"] == "file":
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appliance_name = appliance["name"]
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log.info("Download appliance file from '{}'".format(appliance["download_url"]))
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async with HTTPClient.get(appliance["download_url"]) as response:
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if response.status != 200:
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log.warning(
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"Could not download '{}' due to HTTP error code {}".format(
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appliance["download_url"], response.status
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)
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)
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continue
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try:
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appliance_data = await response.read()
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except asyncio.TimeoutError:
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log.warning("Timeout while downloading '{}'".format(appliance["download_url"]))
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continue
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path = os.path.join(appliances_dir, appliance_name)
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try:
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log.info(f"Saving {appliance_name} file to {path}")
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with open(path, "wb") as f:
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f.write(appliance_data)
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except OSError as e:
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raise ControllerError(f"Could not write appliance file '{path}': {e}")
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downloaded_appliance_files.append(appliance_name)
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# delete old appliance files
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for filename in os.listdir(appliances_dir):
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file_path = os.path.join(appliances_dir, filename)
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if filename in downloaded_appliance_files:
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continue
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try:
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if os.path.isfile(file_path) or os.path.islink(file_path):
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log.info(f"Deleting old appliance file {file_path}")
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os.unlink(file_path)
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except OSError as e:
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log.warning(f"Could not delete old appliance file '{file_path}': {e}")
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continue
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except ValueError as e:
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raise ControllerError(f"Could not read appliances information from GitHub: {e}")
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# download the custom symbols
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await self.download_custom_symbols()
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