mirror of
https://github.com/GNS3/gns3-server
synced 2024-11-25 01:38:08 +00:00
229 lines
7.6 KiB
Python
229 lines
7.6 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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"""
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Represents a uBridge hypervisor and starts/stops the associated uBridge process.
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"""
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import os
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import subprocess
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import asyncio
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import socket
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import re
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from pkg_resources import parse_version
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from gns3server.utils.asyncio import wait_for_process_termination
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from gns3server.utils.asyncio import subprocess_check_output
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from .ubridge_hypervisor import UBridgeHypervisor
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from .ubridge_error import UbridgeError
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import logging
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log = logging.getLogger(__name__)
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class Hypervisor(UBridgeHypervisor):
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"""
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Hypervisor.
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:param project: Project instance
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:param path: path to uBridge executable
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:param working_dir: working directory
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:param host: host/address for this hypervisor
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:param port: port for this hypervisor
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"""
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_instance_count = 1
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def __init__(self, project, path, working_dir, host, port=None):
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if port is None:
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try:
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port = None
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info = socket.getaddrinfo(host, 0, socket.AF_UNSPEC, socket.SOCK_STREAM, 0, socket.AI_PASSIVE)
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if not info:
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raise UbridgeError("getaddrinfo returns an empty list on {}".format(host))
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for res in info:
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af, socktype, proto, _, sa = res
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# let the OS find an unused port for the uBridge hypervisor
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with socket.socket(af, socktype, proto) as sock:
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sock.bind(sa)
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port = sock.getsockname()[1]
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break
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except OSError as e:
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raise UbridgeError("Could not find free port for the uBridge hypervisor: {}".format(e))
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super().__init__(host, port)
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self._project = project
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self._path = path
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self._working_dir = working_dir
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self._command = []
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self._process = None
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self._stdout_file = ""
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self._started = False
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@property
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def process(self):
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"""
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Returns the subprocess of the Hypervisor
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:returns: subprocess
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"""
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return self._process
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@property
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def started(self):
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"""
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Returns either this hypervisor has been started or not.
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:returns: boolean
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"""
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return self._started
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@property
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def path(self):
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"""
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Returns the path to the uBridge executable.
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:returns: path to uBridge
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"""
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return self._path
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@path.setter
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def path(self, path):
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"""
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Sets the path to the uBridge executable.
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:param path: path to uBridge
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"""
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self._path = path
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@asyncio.coroutine
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def _check_ubridge_version(self):
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"""
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Checks if the ubridge executable version is >= 0.9.1
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"""
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try:
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output = yield from subprocess_check_output(self._path, "-v", cwd=self._working_dir)
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match = re.search("ubridge version ([0-9a-z\.]+)", output)
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if match:
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version = match.group(1)
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if parse_version(version) < parse_version("0.9.1"):
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raise UbridgeError("uBridge executable version must be >= 0.9.1")
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else:
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raise UbridgeError("Could not determine uBridge version for {}".format(self._path))
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except (OSError, subprocess.SubprocessError) as e:
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raise UbridgeError("Error while looking for uBridge version: {}".format(e))
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@asyncio.coroutine
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def start(self):
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"""
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Starts the uBridge hypervisor process.
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"""
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yield from self._check_ubridge_version()
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try:
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command = self._build_command()
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log.info("starting ubridge: {}".format(command))
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self._stdout_file = os.path.join(self._working_dir, "ubridge.log")
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log.info("logging to {}".format(self._stdout_file))
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with open(self._stdout_file, "w", encoding="utf-8") as fd:
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self._process = yield from asyncio.create_subprocess_exec(*command,
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stdout=fd,
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stderr=subprocess.STDOUT,
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cwd=self._working_dir)
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log.info("ubridge started PID={}".format(self._process.pid))
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except (OSError, subprocess.SubprocessError) as e:
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ubridge_stdout = self.read_stdout()
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log.error("Could not start ubridge: {}\n{}".format(e, ubridge_stdout))
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raise UBridgeHypervisor("Could not start ubridge: {}\n{}".format(e, ubridge_stdout))
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def _termination_callback(self, returncode):
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"""
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Called when the process has stopped.
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:param returncode: Process returncode
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"""
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log.info("uBridge process has stopped, return code: %d", returncode)
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if returncode != 0:
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self._project.emit("log.error", {"message": "uBridge process has stopped, return code: {}\n{}".format(returncode, self.read_stdout())})
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@asyncio.coroutine
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def stop(self):
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"""
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Stops the uBridge hypervisor process.
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"""
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if self.is_running():
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log.info("Stopping uBridge process PID={}".format(self._process.pid))
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yield from UBridgeHypervisor.stop(self)
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try:
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yield from wait_for_process_termination(self._process, timeout=3)
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except asyncio.TimeoutError:
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if self._process.returncode is None:
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log.warn("uBridge process {} is still running... killing it".format(self._process.pid))
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self._process.kill()
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if self._stdout_file and os.access(self._stdout_file, os.W_OK):
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try:
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os.remove(self._stdout_file)
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except OSError as e:
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log.warning("could not delete temporary uBridge log file: {}".format(e))
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self._started = False
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def read_stdout(self):
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"""
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Reads the standard output of the uBridge process.
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Only use when the process has been stopped or has crashed.
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"""
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output = ""
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if self._stdout_file and os.access(self._stdout_file, os.R_OK):
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try:
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with open(self._stdout_file, "rb") as file:
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output = file.read().decode("utf-8", errors="replace")
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except OSError as e:
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log.warn("could not read {}: {}".format(self._stdout_file, e))
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return output
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def is_running(self):
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"""
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Checks if the process is running
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:returns: True or False
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"""
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if self._process and self._process.returncode is None:
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return True
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return False
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def _build_command(self):
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"""
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Command to start the uBridge hypervisor process.
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(to be passed to subprocess.Popen())
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"""
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command = [self._path]
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command.extend(["-H", "{}:{}".format(self._host, self._port)])
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return command
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