mirror of
https://github.com/GNS3/gns3-server.git
synced 2024-12-24 15:06:44 +00:00
147 lines
6.0 KiB
Python
147 lines
6.0 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 uuid
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import asyncio
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import aiohttp
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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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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):
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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):
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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):
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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().get_section_config("Server")
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appliances_path = os.path.expanduser(server_config.get("appliances_path", "~/GNS3/projects"))
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os.makedirs(appliances_path, exist_ok=True)
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return appliances_path
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def load_appliances(self):
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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 ((get_resource('appliances'), True,), (self.appliances_path(), False,)):
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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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appliance_id = uuid.uuid3(uuid.NAMESPACE_URL, path) # Generate UUID from path to avoid change between reboots
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try:
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with open(path, 'r', encoding='utf-8') as f:
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appliance = Appliance(appliance_id, json.load(f), builtin=builtin)
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appliance.__json__() # Check if loaded without error
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if appliance.status != 'broken':
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self._appliances[appliance.id] = appliance
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except (ValueError, OSError, KeyError) as e:
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log.warning("Cannot load appliance file '%s': %s", path, str(e))
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continue
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@locking
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async def download_appliances(self):
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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("Checking if appliances are up-to-date (ETag {})".format(self._appliances_etag))
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headers["If-None-Match"] = self._appliances_etag
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async with aiohttp.ClientSession() as session:
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async with session.get('https://api.github.com/repos/GNS3/gns3-registry/contents/appliances', headers=headers) as response:
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if response.status == 304:
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log.info("Appliances are already up-to-date (ETag {})".format(self._appliances_etag))
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return
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elif response.status != 200:
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raise aiohttp.web.HTTPConflict(text="Could not retrieve appliances on GitHub due to HTTP error code {}".format(response.status))
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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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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 session.get(appliance["download_url"]) as response:
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if response.status != 200:
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log.warning("Could not download '{}' due to HTTP error code {}".format(appliance["download_url"], response.status))
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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("Saving {} file to {}".format(appliance_name, 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 aiohttp.web.HTTPConflict(text="Could not write appliance file '{}': {}".format(path, e))
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except ValueError as e:
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raise aiohttp.web.HTTPConflict(text="Could not read appliances information from GitHub: {}".format(e))
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