mirror of
https://github.com/GNS3/gns3-server.git
synced 2024-12-27 08:12:32 +00:00
278 lines
8.8 KiB
Python
278 lines
8.8 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2015 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import re
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import time
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import logging
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import asyncio
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from ..utils.asyncio import locked_coroutine
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from .ubridge_error import UbridgeError
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log = logging.getLogger(__name__)
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class UBridgeHypervisor:
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"""
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Creates a new connection to uBridge hypervisor.
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:param host: the hostname or ip address string of the uBridge hypervisor
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:param port: the tcp port integer
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:param timeout: timeout integer for how long to wait for a response to commands sent to the
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hypervisor (defaults to 30 seconds)
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"""
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# Used to parse Ubridge response codes
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error_re = re.compile(r"""^2[0-9]{2}-""")
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success_re = re.compile(r"""^1[0-9]{2}\s{1}""")
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def __init__(self, host, port, timeout=30.0):
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self._host = host
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self._port = port
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self._version = "N/A"
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self._timeout = timeout
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self._reader = None
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self._writer = None
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@asyncio.coroutine
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def connect(self, timeout=10):
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"""
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Connects to the hypervisor.
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"""
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# connect to a local address by default
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# if listening to all addresses (IPv4 or IPv6)
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if self._host == "0.0.0.0":
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host = "127.0.0.1"
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elif self._host == "::":
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host = "::1"
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else:
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host = self._host
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begin = time.time()
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connection_success = False
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last_exception = None
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while time.time() - begin < timeout:
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yield from asyncio.sleep(0.01)
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try:
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self._reader, self._writer = yield from asyncio.open_connection(host, self._port)
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except OSError as e:
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last_exception = e
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continue
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connection_success = True
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break
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if not connection_success:
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raise UbridgeError("Couldn't connect to hypervisor on {}:{} :{}".format(host, self._port, last_exception))
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else:
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log.info("Connected to uBridge hypervisor on {}:{} after {:.4f} seconds".format(host, self._port, time.time() - begin))
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try:
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version = yield from self.send("hypervisor version")
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self._version = version[0].split("-", 1)[0]
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except IndexError:
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self._version = "Unknown"
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@property
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def version(self):
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"""
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Returns uBridge version.
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:returns: version string
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"""
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return self._version
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@asyncio.coroutine
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def close(self):
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"""
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Closes the connection to this hypervisor (but leave it running).
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"""
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yield from self.send("hypervisor close")
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self._writer.close()
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self._reader, self._writer = None
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@asyncio.coroutine
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def stop(self):
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"""
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Stops this hypervisor (will no longer run).
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"""
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try:
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# try to properly stop the hypervisor
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yield from self.send("hypervisor stop")
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except UbridgeError:
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pass
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try:
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if self._writer is not None:
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yield from self._writer.drain()
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self._writer.close()
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except OSError as e:
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log.debug("Stopping hypervisor {}:{} {}".format(self._host, self._port, e))
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self._reader = self._writer = None
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@asyncio.coroutine
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def reset(self):
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"""
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Resets this hypervisor (used to get an empty configuration).
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"""
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yield from self.send("hypervisor reset")
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@property
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def port(self):
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"""
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Returns the port used to start the hypervisor.
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:returns: port number (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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"""
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Sets the port used to start the hypervisor.
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:param port: port number (integer)
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"""
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self._port = port
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@property
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def host(self):
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"""
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Returns the host (binding) used to start the hypervisor.
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:returns: host/address (string)
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"""
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return self._host
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@host.setter
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def host(self, host):
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"""
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Sets the host (binding) used to start the hypervisor.
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:param host: host/address (string)
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"""
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self._host = host
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@locked_coroutine
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def send(self, command):
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"""
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Sends commands to this hypervisor.
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:param command: a uBridge hypervisor command
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:returns: results as a list
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"""
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# uBridge responses are of the form:
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# 1xx yyyyyy\r\n
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# 1xx yyyyyy\r\n
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# ...
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# 100-yyyy\r\n
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# or
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# 2xx-yyyy\r\n
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#
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# Where 1xx is a code from 100-199 for a success or 200-299 for an error
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# The result might be multiple lines and might be less than the buffer size
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# but still have more data. The only thing we know for sure is the last line
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# will begin with '100-' or a '2xx-' and end with '\r\n'
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if self._writer is None or self._reader is None:
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raise UbridgeError("Not connected")
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try:
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command = command.strip() + '\n'
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log.debug("sending {}".format(command))
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self._writer.write(command.encode())
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yield from self._writer.drain()
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except OSError as e:
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raise UbridgeError("Lost communication with {host}:{port} :{error}, Dynamips process running: {run}"
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.format(host=self._host, port=self._port, error=e, run=self.is_running()))
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# Now retrieve the result
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data = []
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buf = ''
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retries = 0
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max_retries = 10
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while True:
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try:
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try:
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chunk = yield from self._reader.read(1024)
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except asyncio.CancelledError:
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# task has been canceled but continue to read
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# any remaining data sent by the hypervisor
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continue
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except ConnectionResetError as e:
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# Sometimes WinError 64 (ERROR_NETNAME_DELETED) is returned here on Windows.
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# These happen if connection reset is received before IOCP could complete
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# a previous operation. Ignore and try again....
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log.warning("Connection reset received while reading uBridge response: {}".format(e))
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continue
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if not chunk:
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if retries > max_retries:
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raise UbridgeError("No data returned from {host}:{port}, uBridge process running: {run}"
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.format(host=self._host, port=self._port, run=self.is_running()))
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else:
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retries += 1
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yield from asyncio.sleep(0.1)
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continue
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retries = 0
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buf += chunk.decode("utf-8")
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except OSError as e:
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raise UbridgeError("Lost communication with {host}:{port} :{error}, uBridge process running: {run}"
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.format(host=self._host, port=self._port, error=e, run=self.is_running()))
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# If the buffer doesn't end in '\n' then we can't be done
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try:
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if buf[-1] != '\n':
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continue
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except IndexError:
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raise UbridgeError("Could not communicate with {host}:{port}, uBridge process running: {run}"
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.format(host=self._host, port=self._port, run=self.is_running()))
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data += buf.split('\r\n')
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if data[-1] == '':
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data.pop()
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buf = ''
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# Does it contain an error code?
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if self.error_re.search(data[-1]):
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raise UbridgeError(data[-1][4:])
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# Or does the last line begin with '100-'? Then we are done!
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if data[-1][:4] == '100-':
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data[-1] = data[-1][4:]
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if data[-1] == 'OK':
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data.pop()
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break
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# Remove success responses codes
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for index in range(len(data)):
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if self.success_re.search(data[index]):
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data[index] = data[index][4:]
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log.debug("returned result {}".format(data))
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return data
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