1
0
mirror of https://github.com/GNS3/gns3-server synced 2024-12-25 16:28:11 +00:00
gns3-server/gns3server/controller/compute.py
2016-05-13 18:48:10 -06:00

262 lines
8.6 KiB
Python

#!/usr/bin/env python
#
# Copyright (C) 2016 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import aiohttp
import asyncio
import json
from ..utils import parse_version
from ..controller.controller_error import ControllerError
from ..config import Config
from ..version import __version__
import logging
log = logging.getLogger(__name__)
class ComputeError(ControllerError):
pass
class Compute:
"""
A GNS3 compute.
"""
def __init__(self, compute_id, controller=None, protocol="http", host="localhost", port=8000, user=None, password=None):
assert controller is not None
log.info("Create compute %s", compute_id)
self._id = compute_id
self._protocol = protocol
self._host = host
self._port = port
self._user = None
self._password = None
self._connected = False
self._controller = controller
self._set_auth(user, password)
self._session = aiohttp.ClientSession()
self._version = None
# If the compute is local but the compute id is local
# it's a configuration issue
if compute_id == "local" and Config.instance().get_section_config("Server")["local"] is False:
raise ComputeError("The local compute is started without --local")
def __del__(self):
self._session.close()
def _set_auth(self, user, password):
"""
Set authentication parameters
"""
self._user = user
self._password = password
if self._user and self._password:
self._auth = aiohttp.BasicAuth(self._user, self._password)
else:
self._auth = None
@property
def version(self):
"""
:returns: Version of compute node (string or None if not connected)
"""
return self._version
@property
def connected(self):
"""
:returns: True if compute node is connected
"""
return self._connected
@property
def id(self):
"""
:returns: Compute identifier (string)
"""
return self._id
@property
def host(self):
"""
:returns: Compute host (string)
"""
return self._host
@property
def port(self):
"""
:returns: Compute port (integer)
"""
return self._port
@property
def protocol(self):
"""
:returns: Compute protocol (string)
"""
return self._protocol
@property
def user(self):
return self._user
@user.setter
def user(self, value):
self._set_auth(value, self._password)
@property
def password(self):
return self._password
@user.setter
def password(self, value):
self._set_auth(self._user, value)
def __json__(self):
return {
"compute_id": self._id,
"protocol": self._protocol,
"host": self._host,
"port": self._port,
"user": self._user,
"connected": self._connected
}
@asyncio.coroutine
def steam_file(self, project, path):
"""
Read file of a project and stream it
:param project: A project object
:param path: The path of the file in the project
:returns: A file stream
"""
url = self._getUrl("/projects/{}/stream/{}".format(project.id, path))
response = yield from self._session.request("GET", url, auth=self._auth)
if response.status == 404:
raise aiohttp.web.HTTPNotFound(text="{} not found on compute".format(path))
return response.content
@asyncio.coroutine
def http_query(self, method, path, data=None):
if not self._connected:
yield from self._connect()
if not self._connected:
raise aiohttp.web.HTTPConflict(text="The server {} is not a GNS3 server".format(self._id))
response = yield from self._run_http_query(method, path, data=data)
return response
@asyncio.coroutine
def _connect(self):
"""
Check if remote server is accessible
"""
if not self._connected:
response = yield from self._run_http_query("GET", "/version")
if "version" not in response.json:
raise aiohttp.web.HTTPConflict(text="The server {} is not a GNS3 server".format(self._id))
self._version = response.json["version"]
if parse_version(__version__)[:2] != parse_version(response.json["version"])[:2]:
raise aiohttp.web.HTTPConflict(text="The server {} versions are not compatible {} != {}".format(self._id, __version__, response.json["version"]))
self._notifications = asyncio.async(self._connect_notification())
self._connected = True
@asyncio.coroutine
def _connect_notification(self):
"""
Connect to the notification stream
"""
ws = yield from self._session.ws_connect(self._getUrl("/notifications/ws"))
while True:
response = yield from ws.receive()
if response.tp == aiohttp.MsgType.closed or response.tp == aiohttp.MsgType.error:
self._connected = False
break
msg = json.loads(response.data)
action = msg.pop("action")
event = msg.pop("event")
self._controller.emit(action, event, compute_id=self.id, **msg)
def _getUrl(self, path):
return "{}://{}:{}/v2/compute{}".format(self._protocol, self._host, self._port, path)
@asyncio.coroutine
def _run_http_query(self, method, path, data=None):
with aiohttp.Timeout(10):
url = self._getUrl(path)
headers = {'content-type': 'application/json'}
if data == {}:
data = None
elif data is not None:
if hasattr(data, '__json__'):
data = data.__json__()
data = json.dumps(data)
response = yield from self._session.request(method, url, headers=headers, data=data, auth=self._auth)
body = yield from response.read()
if body:
body = body.decode()
if response.status >= 300:
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="Forbidden {} {}".format(url, body))
elif response.status == 404:
raise aiohttp.web.HTTPNotFound(text="{} not found on compute".format(url))
elif response.status == 409:
raise aiohttp.web.HTTPConflict(text="Conflict {} {}".format(url, body))
elif response.status == 503:
raise aiohttp.web.HTTPServiceUnavailable(text="Service unavailable {} {}".format(url, body))
else:
raise NotImplementedError("{} status code is not supported".format(response.status))
if body and len(body):
try:
response.json = json.loads(body)
except ValueError:
raise aiohttp.web.HTTPConflict(text="The server {} is not a GNS3 server".format(self._id))
if response.json is None:
response.json = {}
return response
@asyncio.coroutine
def get(self, path):
return (yield from self.http_query("GET", path))
@asyncio.coroutine
def post(self, path, data={}):
response = yield from self.http_query("POST", path, data)
return response
@asyncio.coroutine
def put(self, path, data={}):
response = yield from self.http_query("PUT", path, data)
return response
@asyncio.coroutine
def delete(self, path):
return (yield from self.http_query("DELETE", path))