mirror of
https://github.com/GNS3/gns3-server
synced 2024-12-01 04:38:12 +00:00
284 lines
7.7 KiB
Python
284 lines
7.7 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2013 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 Dynamips hypervisor and starts/stops the associated Dynamips process.
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"""
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import os
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import time
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import subprocess
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import tempfile
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from .dynamips_hypervisor import DynamipsHypervisor
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from .dynamips_error import DynamipsError
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import logging
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log = logging.getLogger(__name__)
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class Hypervisor(DynamipsHypervisor):
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"""
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Hypervisor.
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:param path: path to Dynamips executable
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:param working_dir: working directory
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:param port: port for this hypervisor
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:param host: host/address for this hypervisor
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"""
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_instance_count = 0
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def __init__(self, path, working_dir, host, port):
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DynamipsHypervisor.__init__(self, working_dir, host, port)
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# create an unique ID
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self._id = Hypervisor._instance_count
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Hypervisor._instance_count += 1
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self._path = path
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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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# settings used the load-balance hypervisors
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# (for the hypervisor manager)
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self._memory_load = 0
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self._ios_image_ref = ""
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@property
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def id(self):
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"""
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Returns the unique ID for this hypervisor.
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:returns: id (integer)
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"""
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return(self._id)
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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 Dynamips executable.
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:returns: path to Dynamips
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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 Dynamips executable.
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:param path: path to Dynamips
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"""
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self._path = path
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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 Dynamips 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 Dynamips 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 Dynamips 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 Dynamips 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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@property
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def image_ref(self):
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"""
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Returns the reference IOS image name
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(used by the hypervisor manager for load-balancing purposes).
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:returns: image reference name
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"""
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return self._ios_image_ref
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@image_ref.setter
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def image_ref(self, ios_image_name):
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"""
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Sets the reference IOS image name
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(used by the hypervisor manager for load-balancing purposes).
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:param ios_image_name: image reference name
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"""
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self._ios_image_ref = ios_image_name
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def increase_memory_load(self, memory):
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"""
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Increases the memory load of this hypervisor.
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(used by the hypervisor manager for load-balancing purposes).
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:param memory: amount of RAM (integer)
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"""
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self._memory_load += memory
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def decrease_memory_load(self, memory):
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"""
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Decreases the memory load of this hypervisor.
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(used by the hypervisor manager for load-balancing purposes).
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:param memory: amount of RAM (integer)
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"""
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self._memory_load -= memory
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@property
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def memory_load(self):
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"""
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Returns the memory load of this hypervisor.
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(used by the hypervisor manager for load-balancing purposes).
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:returns: amount of RAM (integer)
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"""
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return self._memory_load
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def start(self):
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"""
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Starts the Dynamips hypervisor process.
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"""
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self._command = self._build_command()
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try:
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log.info("starting Dynamips: {}".format(self._command))
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with tempfile.NamedTemporaryFile(delete=False) as fd:
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self._stdout_file = fd.name
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log.info("Dynamips process logging to {}".format(fd.name))
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self._process = subprocess.Popen(self._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("Dynamips started PID={}".format(self._process.pid))
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self._started = True
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except OSError as e:
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log.error("could not start Dynamips: {}".format(e))
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raise DynamipsError("could not start Dynamips: {}".format(e))
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def stop(self):
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"""
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Stops the Dynamips hypervisor process.
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"""
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if self.is_running():
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DynamipsHypervisor.stop(self)
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log.info("stopping Dynamips PID={}".format(self._process.pid))
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try:
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# give some time for the hypervisor to properly stop.
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# time to delete UNIX NIOs for instance.
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time.sleep(0.01)
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self._process.terminate()
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self._process.wait(1)
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except subprocess.TimeoutExpired:
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self._process.kill()
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if self._process.poll() == None:
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log.warn("Dynamips process {} is still running".format(self._process.pid))
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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 Dynamips 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 Dynamips 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) as file:
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output = file.read()
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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.poll() == 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 Dynamips 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(["-N1"]) # use instance IDs for filenames
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if self._host != '0.0.0.0':
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command.extend(['-H', self._host + ':' + str(self._port)])
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else:
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command.extend(['-H', str(self._port)])
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return command
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