Handle net/dom start/stop in Topology
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parent
9d71490264
commit
71b5d661c0
4 changed files with 191 additions and 34 deletions
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@ -154,6 +154,10 @@ class Container(util.LibvirtObject):
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self.lxc_container = None
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@property
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def up(self):
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return self.lxc_container is not None
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def get_jinja_networks(self):
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""" Get a jinja2 environment-compatible network list """
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return [
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@ -25,6 +25,10 @@ class Network(util.LibvirtObject):
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self.ipv6 = util.Addrv6(self.id, None, host_address=True)
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self.lxc_network = None
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@property
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def up(self):
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return self.lxc_network is not None
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def create(self):
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if self.lxc_network:
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raise self.AlreadyExists()
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@ -50,6 +54,7 @@ class Network(util.LibvirtObject):
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def cleanup(self):
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if self.lxc_network:
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self.lxc_network.destroy()
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self.lxc_network = None
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def __enter__(self):
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self.create()
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@ -1,12 +1,41 @@
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import yaml
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import sys
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from functools import wraps
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from . import network, container
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class YamlTopology:
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""" Parse a YAML description of a network topology. The networks' links and domains
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are contained in the `links` and `domains` attributes, but their `create` methods
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are not called. """
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def requires_parsed(func):
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@wraps(func)
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def aux(self, *args, **kwargs):
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if not self.parsed:
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raise self.__class__.NotParsed
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return func(self, *args, **kwargs)
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return aux
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def requires_id_in_dom_range(func):
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@wraps(func)
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def aux(self, dom_id, *args, **kwargs):
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if dom_id not in range(len(self.domains)):
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raise IndexError("bad domain id: {}".format(dom_id))
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return func(self, dom_id, *args, **kwargs)
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return aux
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def requires_id_in_link_range(func):
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@wraps(func)
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def aux(self, link_id, *args, **kwargs):
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if link_id not in range(len(self.links)):
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raise IndexError("bad domain id: {}".format(link_id))
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return func(self, link_id, *args, **kwargs)
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return aux
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class Topology:
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""" A generic network topology """
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class InvalidConfiguration(Exception):
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def __init__(self, reason):
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@ -15,13 +44,153 @@ class YamlTopology:
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def __str__(self):
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return "Bad topology configuration: {}".format(self.reason)
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def __init__(self, path, conn):
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self.path = path
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class NotParsed(Exception):
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def __str__(self):
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return "This topology is not parsed yet"
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def __init__(self, conn):
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self.conn = conn
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self.parsed = False
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self.domains = None
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self.links = None
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@requires_parsed
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@requires_id_in_link_range
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def net_setstate_single(self, link_id, state, verbose=False, verbose_inline=False):
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""" Start or stop a single network.
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* `net_id`: the link to be affected
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* `verbose`: if true, prints progress
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"""
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link = self.links[link_id]
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print_endchar = "\t" if verbose_inline else "\n"
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if link.up == state:
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if verbose:
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print(
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"{} already {}.".format(link.name, "up" if state else "down"),
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end=print_endchar,
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)
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sys.stdout.flush()
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return
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if verbose:
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print("{}... ".format(link.name), end="")
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sys.stdout.flush()
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if state is True:
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link.create()
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else:
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link.cleanup()
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if verbose:
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print("done.", end=print_endchar)
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sys.stdout.flush()
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@requires_parsed
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@requires_id_in_dom_range
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def dom_setstate_single(self, dom_id, state, verbose=False, verbose_inline=False):
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""" Start or stop a single domain.
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* `dom_id`: the domain to be affected
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* `verbose`: if true, prints progress
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"""
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dom = self.domains[dom_id]
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print_endchar = "\t" if verbose_inline else "\n"
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if dom.up == state:
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if verbose:
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print(
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"{} already {}.".format(dom.name, "up" if state else "down"),
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end=print_endchar,
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)
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sys.stdout.flush()
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return
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if verbose:
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print("{}... ".format(dom.name), end="")
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sys.stdout.flush()
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if state is True:
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dom.create()
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else:
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dom.cleanup()
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if verbose:
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print("done.", end=print_endchar)
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sys.stdout.flush()
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def net_start_single(self, link_id, verbose=False, verbose_inline=False):
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self.net_setstate_single(link_id, True, verbose, verbose_inline)
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def net_stop_single(self, link_id, verbose=False, verbose_inline=False):
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self.net_setstate_single(link_id, False, verbose, verbose_inline)
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def dom_start_single(self, dom_id, verbose=False, verbose_inline=False):
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self.dom_setstate_single(dom_id, True, verbose, verbose_inline)
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def dom_stop_single(self, dom_id, verbose=False, verbose_inline=False):
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self.dom_setstate_single(dom_id, False, verbose, verbose_inline)
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@requires_parsed
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def net_setstate(self, state, verbose=False):
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""" Start or stop the networks.
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* `verbose`: if true, prints progress
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"""
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if verbose:
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print("{} networks: ".format("Starting" if state else "Stopping"), end="\t")
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sys.stdout.flush()
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for link_id in range(len(self.links)):
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self.net_setstate_single(link_id, state, verbose, verbose_inline=True)
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if verbose:
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print("") # New line
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@requires_parsed
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def dom_setstate(self, state, verbose=False):
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""" Start or stop the domains.
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* `verbose`: if true, prints progress
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"""
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if verbose:
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print("{} domains: ".format("Starting" if state else "Stopping"), end="\t")
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sys.stdout.flush()
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for dom_id in range(len(self.domains)):
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self.dom_setstate_single(dom_id, state, verbose, verbose_inline=True)
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if verbose:
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print("") # New line
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def net_start(self, verbose=False):
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self.net_setstate(True, verbose)
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def net_stop(self, verbose=False):
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self.net_setstate(False, verbose)
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def dom_start(self, verbose=False):
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self.dom_setstate(True, verbose)
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def dom_stop(self, verbose=False):
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self.dom_setstate(False, verbose)
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del requires_id_in_link_range
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del requires_id_in_dom_range
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del requires_parsed
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class YamlTopology(Topology):
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""" Parse a YAML description of a network topology. The networks' links and domains
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are contained in the `links` and `domains` attributes, but their `create` methods
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are not called. """
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def __init__(self, path, conn):
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super().__init__(conn)
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self.path = path
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self._parse()
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def _parse(self):
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@ -74,3 +243,5 @@ class YamlTopology:
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)
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for dom in sorted_dom_names
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]
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self.parsed = True
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@ -1,11 +1,9 @@
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#!/usr/bin/env python3
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from lxc_net import parse_network
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import sys
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import signal
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import libvirt
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import argparse
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import asyncio
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def parse_args():
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@ -16,18 +14,6 @@ def parse_args():
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return args
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async def spawn_network(link):
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await link.async_create()
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print(link.name, end="... ")
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sys.stdout.flush()
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async def spawn_networks(links):
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link_tasks = [asyncio.create_task(spawn_network(link)) for link in links]
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for link_task in link_tasks:
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await link_task
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def main():
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args = parse_args()
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@ -46,25 +32,16 @@ def main():
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topology = parse_network.YamlTopology(args.topology, conn)
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print(">> Spawning networks: ", end="")
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sys.stdout.flush()
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asyncio.run(spawn_networks(topology.links))
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print("Done.")
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print(">> Spawning containers: ", end="")
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sys.stdout.flush()
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for c_dom in topology.domains:
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if received_sigint:
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return
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print(c_dom.name, end="... ")
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sys.stdout.flush()
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c_dom.create()
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print("Done.")
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topology.net_start(verbose=True)
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topology.dom_start(verbose=True)
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print("Network running. Press ^C to terminate.")
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while not received_sigint: # Wait for SIGINT
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signal.pause()
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topology.dom_stop(verbose=True)
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topology.net_stop(verbose=True)
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if __name__ == "__main__":
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main()
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