mirror of
https://github.com/GNS3/gns3-server.git
synced 2024-11-16 16:54:51 +02:00
666 lines
26 KiB
Python
666 lines
26 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (C) 2016 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 ipaddress
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import aiohttp
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import asyncio
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import async_timeout
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import socket
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import json
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import uuid
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import sys
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import io
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from operator import itemgetter
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from ..utils import parse_version
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from ..utils.asyncio import locking
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from ..controller.controller_error import ControllerError
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from ..version import __version__, __version_info__
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import logging
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log = logging.getLogger(__name__)
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class ComputeError(ControllerError):
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pass
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class ComputeConflict(aiohttp.web.HTTPConflict):
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"""
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Raise when the compute send a 409 that we can handle
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:param response: The response of the compute
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"""
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def __init__(self, response):
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super().__init__(text=response["message"])
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self.response = response
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class Compute:
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"""
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A GNS3 compute.
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"""
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def __init__(self, compute_id, controller=None, protocol="http", host="localhost",
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port=3080, user=None, password=None, name=None, console_host=None, ssl_context=None):
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self._http_session = None
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assert controller is not None
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log.info("Create compute %s", compute_id)
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if compute_id is None:
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self._id = str(uuid.uuid4())
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else:
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self._id = compute_id
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self.protocol = protocol
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self._console_host = console_host
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self.host = host
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self.port = port
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self._user = None
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self._password = None
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self._connected = False
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self._notifications = None
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self._closed = False # Close mean we are destroying the compute node
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self._controller = controller
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self._set_auth(user, password)
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self._cpu_usage_percent = None
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self._memory_usage_percent = None
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self._last_error = None
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self._ssl_context = ssl_context
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self._capabilities = {
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"version": None,
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"node_types": []
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}
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self.name = name
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# Cache of interfaces on remote host
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self._interfaces_cache = None
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self._connection_failure = 0
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def _session(self):
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if self._http_session is None or self._http_session.closed is True:
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self._http_session = aiohttp.ClientSession(connector=aiohttp.TCPConnector(limit=None,
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force_close=True,
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ssl_context=self._ssl_context))
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return self._http_session
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#def __del__(self):
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#
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# if self._http_session:
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# self._http_session.close()
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def _set_auth(self, user, password):
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"""
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Set authentication parameters
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"""
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if user is None or len(user.strip()) == 0:
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self._user = None
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self._password = None
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self._auth = None
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else:
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self._user = user.strip()
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if password:
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self._password = password.strip()
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try:
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self._auth = aiohttp.BasicAuth(self._user, self._password, "utf-8")
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except ValueError as e:
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log.error(str(e))
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else:
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self._password = None
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self._auth = aiohttp.BasicAuth(self._user, "")
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def set_last_error(self, msg):
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"""
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Set the last error message for this compute.
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:param msg: message
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"""
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self._last_error = msg
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async def interfaces(self):
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"""
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Get the list of network on compute
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"""
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if not self._interfaces_cache:
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response = await self.get("/network/interfaces")
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self._interfaces_cache = response.json
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return self._interfaces_cache
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async def update(self, **kwargs):
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for kw in kwargs:
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if kw not in ("user", "password"):
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setattr(self, kw, kwargs[kw])
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# It's important to set user and password at the same time
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if "user" in kwargs or "password" in kwargs:
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self._set_auth(kwargs.get("user", self._user), kwargs.get("password", self._password))
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if self._http_session and not self._http_session.closed:
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await self._http_session.close()
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self._connected = False
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self._controller.notification.controller_emit("compute.updated", self.__json__())
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self._controller.save()
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async def close(self):
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self._connected = False
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if self._http_session and not self._http_session.closed:
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await self._http_session.close()
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try:
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if self._notifications:
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await self._notifications
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except asyncio.CancelledError:
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pass
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self._closed = True
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@property
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def name(self):
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"""
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:returns: Compute name
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"""
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return self._name
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@name.setter
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def name(self, name):
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if name is not None:
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self._name = name
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else:
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if self._user:
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user = self._user
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# Due to random user generated by 1.4 it's common to have a very long user
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if len(user) > 14:
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user = user[:11] + "..."
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self._name = "{}://{}@{}:{}".format(self._protocol, user, self._host, self._port)
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else:
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self._name = "{}://{}:{}".format(self._protocol, self._host, self._port)
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@property
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def connected(self):
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"""
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:returns: True if compute node is connected
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"""
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return self._connected
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@property
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def id(self):
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"""
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:returns: Compute identifier (string)
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"""
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return self._id
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@property
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def host(self):
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"""
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:returns: Compute host (string)
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"""
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return self._host
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@property
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def host_ip(self):
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"""
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Return the IP associated to the host
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"""
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try:
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return socket.gethostbyname(self._host)
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except socket.gaierror:
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return '0.0.0.0'
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@host.setter
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def host(self, host):
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self._host = host
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if self._console_host is None:
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self._console_host = host
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@property
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def console_host(self):
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return self._console_host
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@property
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def port(self):
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"""
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:returns: Compute port (integer)
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"""
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return self._port
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@port.setter
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def port(self, port):
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self._port = port
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@property
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def protocol(self):
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"""
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:returns: Compute protocol (string)
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"""
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return self._protocol
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@protocol.setter
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def protocol(self, protocol):
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self._protocol = protocol
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@property
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def user(self):
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return self._user
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@user.setter
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def user(self, value):
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self._set_auth(value, self._password)
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@property
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def password(self):
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return self._password
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@password.setter
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def password(self, value):
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self._set_auth(self._user, value)
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@property
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def cpu_usage_percent(self):
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return self._cpu_usage_percent
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@property
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def memory_usage_percent(self):
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return self._memory_usage_percent
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def __json__(self, topology_dump=False):
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"""
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:param topology_dump: Filter to keep only properties require for saving on disk
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"""
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if topology_dump:
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return {
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"compute_id": self._id,
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"name": self._name,
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"protocol": self._protocol,
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"host": self._host,
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"port": self._port
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}
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return {
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"compute_id": self._id,
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"name": self._name,
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"protocol": self._protocol,
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"host": self._host,
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"port": self._port,
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"user": self._user,
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"connected": self._connected,
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"cpu_usage_percent": self._cpu_usage_percent,
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"memory_usage_percent": self._memory_usage_percent,
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"capabilities": self._capabilities,
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"last_error": self._last_error
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}
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async def download_file(self, project, path):
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"""
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Read file of a project and download it
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:param project: A project object
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:param path: The path of the file in the project
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:returns: A file stream
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"""
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url = self._getUrl("/projects/{}/files/{}".format(project.id, path))
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response = await self._session().request("GET", url, auth=self._auth)
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if response.status == 404:
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raise aiohttp.web.HTTPNotFound(text="File '{}' not found on compute".format(path))
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return response
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async def download_image(self, image_type, image):
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"""
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Read file of a project and download it
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:param image_type: Image type
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:param image: The path of the image
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:returns: A file stream
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"""
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url = self._getUrl("/{}/images/{}".format(image_type, image))
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response = await self._session().request("GET", url, auth=self._auth)
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if response.status == 404:
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raise aiohttp.web.HTTPNotFound(text="Image '{}' not found on compute".format(image))
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return response
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async def http_query(self, method, path, data=None, dont_connect=False, **kwargs):
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"""
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:param dont_connect: If true do not reconnect if not connected
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"""
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if not self._connected and not dont_connect:
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if self._id == "vm" and not self._controller.gns3vm.running:
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await self._controller.gns3vm.start()
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await self.connect()
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if not self._connected and not dont_connect:
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raise ComputeError("Cannot connect to compute '{}' with request {} {}".format(self._name, method, path))
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response = await self._run_http_query(method, path, data=data, **kwargs)
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return response
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async def _try_reconnect(self):
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"""
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We catch error during reconnect
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"""
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try:
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await self.connect()
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except aiohttp.web.HTTPConflict:
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pass
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@locking
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async def connect(self):
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"""
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Check if remote server is accessible
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"""
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if not self._connected and not self._closed and self.host:
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try:
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log.info("Connecting to compute '{}'".format(self._id))
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response = await self._run_http_query("GET", "/capabilities")
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except ComputeError as e:
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log.warning("Cannot connect to compute '{}': {}".format(self._id, e))
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# Try to reconnect after 5 seconds if server unavailable only if not during tests (otherwise we create a ressource usage bomb)
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if not hasattr(sys, "_called_from_test") or not sys._called_from_test:
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self._connection_failure += 1
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# After 5 failure we close the project using the compute to avoid sync issues
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if self._connection_failure == 10:
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log.error("Could not connect to compute '{}' after multiple attempts: {}".format(self._id, e))
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await self._controller.close_compute_projects(self)
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asyncio.get_event_loop().call_later(5, lambda: asyncio.ensure_future(self._try_reconnect()))
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return
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except aiohttp.web.HTTPNotFound:
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raise aiohttp.web.HTTPConflict(text="The server {} is not a GNS3 server or it's a 1.X server".format(self._id))
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except aiohttp.web.HTTPUnauthorized:
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raise aiohttp.web.HTTPConflict(text="Invalid auth for server {}".format(self._id))
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except aiohttp.web.HTTPServiceUnavailable:
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raise aiohttp.web.HTTPConflict(text="The server {} is unavailable".format(self._id))
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except ValueError:
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raise aiohttp.web.HTTPConflict(text="Invalid server url for server {}".format(self._id))
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if "version" not in response.json:
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msg = "The server {} is not a GNS3 server".format(self._id)
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log.error(msg)
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await self._http_session.close()
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raise aiohttp.web.HTTPConflict(text=msg)
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self._capabilities = response.json
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if response.json["version"].split("-")[0] != __version__.split("-")[0]:
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if self._name.startswith("GNS3 VM"):
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msg = "GNS3 version {} is not the same as the GNS3 VM version {}. Please upgrade the GNS3 VM.".format(__version__,
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response.json["version"])
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else:
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msg = "GNS3 controller version {} is not the same as compute {} version {}".format(__version__,
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self._name,
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response.json["version"])
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if __version_info__[3] == 0:
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# Stable release
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log.error(msg)
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await self._http_session.close()
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self._last_error = msg
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raise aiohttp.web.HTTPConflict(text=msg)
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elif parse_version(__version__)[:2] != parse_version(response.json["version"])[:2]:
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# We don't allow different major version to interact even with dev build
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log.error(msg)
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await self._http_session.close()
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self._last_error = msg
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raise aiohttp.web.HTTPConflict(text=msg)
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else:
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msg = "{}\nUsing different versions may result in unexpected problems. Please use at your own risk.".format(msg)
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self._controller.notification.controller_emit("log.warning", {"message": msg})
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self._notifications = asyncio.gather(self._connect_notification())
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self._connected = True
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self._connection_failure = 0
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self._last_error = None
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self._controller.notification.controller_emit("compute.updated", self.__json__())
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async def _connect_notification(self):
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"""
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Connect to the notification stream
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"""
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ws_url = self._getUrl("/notifications/ws")
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try:
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async with self._session().ws_connect(ws_url, auth=self._auth, heartbeat=10) as ws:
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log.info("Connected to compute '{}' WebSocket '{}'".format(self._id, ws_url))
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async for response in ws:
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if response.type == aiohttp.WSMsgType.TEXT:
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msg = json.loads(response.data)
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action = msg.pop("action")
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event = msg.pop("event")
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project_id = msg.pop("project_id", None)
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if action == "ping":
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self._cpu_usage_percent = event["cpu_usage_percent"]
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self._memory_usage_percent = event["memory_usage_percent"]
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#FIXME: slow down number of compute events
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self._controller.notification.controller_emit("compute.updated", self.__json__())
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else:
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await self._controller.notification.dispatch(action, event, project_id=project_id, compute_id=self.id)
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else:
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if response.type == aiohttp.WSMsgType.CLOSE:
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await ws.close()
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elif response.type == aiohttp.WSMsgType.ERROR:
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log.error("Error received on compute '{}' WebSocket '{}': {}".format(self._id, ws_url, ws.exception()))
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elif response.type == aiohttp.WSMsgType.CLOSED:
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pass
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break
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except aiohttp.ClientError as e:
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log.error("Client response error received on compute '{}' WebSocket '{}': {}".format(self._id, ws_url,e))
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finally:
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self._connected = False
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log.info("Connection closed to compute '{}' WebSocket '{}'".format(self._id, ws_url))
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# Try to reconnect after 1 second if server unavailable only if not during tests (otherwise we create a ressources usage bomb)
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if not hasattr(sys, "_called_from_test") or not sys._called_from_test:
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asyncio.get_event_loop().call_later(1, lambda: asyncio.ensure_future(self.connect()))
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self._cpu_usage_percent = None
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self._memory_usage_percent = None
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self._controller.notification.controller_emit("compute.updated", self.__json__())
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def _getUrl(self, path):
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host = self._host
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# IPV6
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if host:
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# IPV6
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if ":" in host:
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# Reduce IPV6 to his simple form
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host = str(ipaddress.IPv6Address(host))
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if host == "::":
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host = "::1"
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host = "[{}]".format(host)
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elif host == "0.0.0.0":
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host = "127.0.0.1"
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return "{}://{}:{}/v2/compute{}".format(self._protocol, host, self._port, path)
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def get_url(self, path):
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""" Returns URL for specific path at Compute"""
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return self._getUrl(path)
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async def _run_http_query(self, method, path, data=None, timeout=20, raw=False):
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with async_timeout.timeout(timeout):
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url = self._getUrl(path)
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headers = {}
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headers['content-type'] = 'application/json'
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chunked = None
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if data == {}:
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data = None
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elif data is not None:
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if hasattr(data, '__json__'):
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data = json.dumps(data.__json__())
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elif isinstance(data, aiohttp.streams.EmptyStreamReader):
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data = None
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# Stream the request
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elif isinstance(data, aiohttp.streams.StreamReader) or isinstance(data, bytes):
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chunked = True
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headers['content-type'] = 'application/octet-stream'
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# If the data is an open file we will iterate on it
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elif isinstance(data, io.BufferedIOBase):
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chunked = True
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headers['content-type'] = 'application/octet-stream'
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else:
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data = json.dumps(data).encode("utf-8")
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try:
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log.debug("Attempting request to compute: {method} {url} {headers}".format(method=method, url=url, headers=headers))
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response = await self._session().request(method, url, headers=headers, data=data, auth=self._auth, chunked=chunked, timeout=timeout)
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except asyncio.TimeoutError:
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raise ComputeError("Timeout error for {} call to {} after {}s".format(method, url, timeout))
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except (aiohttp.ClientError, aiohttp.ServerDisconnectedError, ValueError, KeyError, socket.gaierror) as e:
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# aiohttp 2.3.1 raises socket.gaierror when cannot find host
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raise ComputeError(str(e))
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body = await response.read()
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if body and not raw:
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body = body.decode()
|
|
|
|
if response.status >= 300:
|
|
# Try to decode the GNS3 error
|
|
if body and not raw:
|
|
try:
|
|
msg = json.loads(body)["message"]
|
|
except (KeyError, ValueError):
|
|
msg = body
|
|
else:
|
|
msg = ""
|
|
|
|
if response.status == 400:
|
|
raise aiohttp.web.HTTPBadRequest(text="Bad request {} {}".format(url, body))
|
|
elif response.status == 401:
|
|
raise aiohttp.web.HTTPUnauthorized(text="Invalid authentication for compute {}".format(self.id))
|
|
elif response.status == 403:
|
|
raise aiohttp.web.HTTPForbidden(text=msg)
|
|
elif response.status == 404:
|
|
raise aiohttp.web.HTTPNotFound(text="{} {} not found".format(method, path))
|
|
elif response.status == 408 or response.status == 504:
|
|
raise aiohttp.web.HTTPRequestTimeout(text="{} {} request timeout".format(method, path))
|
|
elif response.status == 409:
|
|
try:
|
|
raise ComputeConflict(json.loads(body))
|
|
# If the 409 doesn't come from a GNS3 server
|
|
except ValueError:
|
|
raise aiohttp.web.HTTPConflict(text=msg)
|
|
elif response.status == 500:
|
|
raise aiohttp.web.HTTPInternalServerError(text="Internal server error {}".format(url))
|
|
elif response.status == 503:
|
|
raise aiohttp.web.HTTPServiceUnavailable(text="Service unavailable {} {}".format(url, body))
|
|
else:
|
|
raise NotImplementedError("{} status code is not supported for {} '{}'".format(response.status, method, url))
|
|
if body and len(body):
|
|
if raw:
|
|
response.body = body
|
|
else:
|
|
try:
|
|
response.json = json.loads(body)
|
|
except ValueError:
|
|
raise aiohttp.web.HTTPConflict(text="The server {} is not a GNS3 server".format(self._id))
|
|
else:
|
|
response.json = {}
|
|
response.body = b""
|
|
return response
|
|
|
|
async def get(self, path, **kwargs):
|
|
return (await self.http_query("GET", path, **kwargs))
|
|
|
|
async def post(self, path, data={}, **kwargs):
|
|
response = await self.http_query("POST", path, data, **kwargs)
|
|
return response
|
|
|
|
async def put(self, path, data={}, **kwargs):
|
|
response = await self.http_query("PUT", path, data, **kwargs)
|
|
return response
|
|
|
|
async def delete(self, path, **kwargs):
|
|
return (await self.http_query("DELETE", path, **kwargs))
|
|
|
|
async def forward(self, method, type, path, data=None):
|
|
"""
|
|
Forward a call to the emulator on compute
|
|
"""
|
|
try:
|
|
action = "/{}/{}".format(type, path)
|
|
res = await self.http_query(method, action, data=data, timeout=None)
|
|
except aiohttp.ServerDisconnectedError:
|
|
log.error("Connection lost to %s during %s %s", self._id, method, action)
|
|
raise aiohttp.web.HTTPGatewayTimeout()
|
|
return res.json
|
|
|
|
async def images(self, type):
|
|
"""
|
|
Return the list of images available for this type on the compute node.
|
|
"""
|
|
images = []
|
|
|
|
res = await self.http_query("GET", "/{}/images".format(type), timeout=None)
|
|
images = res.json
|
|
|
|
try:
|
|
if type in ["qemu", "dynamips", "iou"]:
|
|
#for local_image in list_images(type):
|
|
# if local_image['filename'] not in [i['filename'] for i in images]:
|
|
# images.append(local_image)
|
|
images = sorted(images, key=itemgetter('filename'))
|
|
else:
|
|
images = sorted(images, key=itemgetter('image'))
|
|
except OSError as e:
|
|
raise ComputeError("Cannot list images: {}".format(str(e)))
|
|
return images
|
|
|
|
async def list_files(self, project):
|
|
"""
|
|
List files in the project on computes
|
|
"""
|
|
path = "/projects/{}/files".format(project.id)
|
|
res = await self.http_query("GET", path, timeout=None)
|
|
return res.json
|
|
|
|
async def get_ip_on_same_subnet(self, other_compute):
|
|
"""
|
|
Try to find the best ip for communication from one compute
|
|
to another
|
|
|
|
:returns: Tuple (ip_for_this_compute, ip_for_other_compute)
|
|
"""
|
|
if other_compute == self:
|
|
return (self.host_ip, self.host_ip)
|
|
|
|
# Perhaps the user has correct network gateway, we trust him
|
|
if (self.host_ip not in ('0.0.0.0', '127.0.0.1') and other_compute.host_ip not in ('0.0.0.0', '127.0.0.1')):
|
|
return (self.host_ip, other_compute.host_ip)
|
|
|
|
this_compute_interfaces = await self.interfaces()
|
|
other_compute_interfaces = await other_compute.interfaces()
|
|
|
|
# Sort interface to put the compute host in first position
|
|
# we guess that if user specified this host it could have a reason (VMware Nat / Host only interface)
|
|
this_compute_interfaces = sorted(this_compute_interfaces, key=lambda i: i["ip_address"] != self.host_ip)
|
|
other_compute_interfaces = sorted(other_compute_interfaces, key=lambda i: i["ip_address"] != other_compute.host_ip)
|
|
|
|
for this_interface in this_compute_interfaces:
|
|
# Skip if no ip or no netmask (vbox when stopped set a null netmask)
|
|
if len(this_interface["ip_address"]) == 0 or this_interface["netmask"] is None:
|
|
continue
|
|
# Ignore 169.254 network because it's for Windows special purpose
|
|
if this_interface["ip_address"].startswith("169.254."):
|
|
continue
|
|
|
|
this_network = ipaddress.ip_network("{}/{}".format(this_interface["ip_address"], this_interface["netmask"]), strict=False)
|
|
|
|
for other_interface in other_compute_interfaces:
|
|
if len(other_interface["ip_address"]) == 0 or other_interface["netmask"] is None:
|
|
continue
|
|
|
|
# Avoid stuff like 127.0.0.1
|
|
if other_interface["ip_address"] == this_interface["ip_address"]:
|
|
continue
|
|
|
|
other_network = ipaddress.ip_network("{}/{}".format(other_interface["ip_address"], other_interface["netmask"]), strict=False)
|
|
if this_network.overlaps(other_network):
|
|
return (this_interface["ip_address"], other_interface["ip_address"])
|
|
|
|
raise ValueError("No common subnet for compute {} and {}".format(self.name, other_compute.name))
|