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# Copyright (C) 2004 Mike Wray <mike.wray@hp.com>
"""Handler for vnet operations.
"""
from xen.util import Brctl
import sxp
import XendDB
from XendError import XendError
from XendLogging import log
def vnet_cmd(cmd):
out = None
try:
try:
out = file("/proc/vnet/policy", "wb")
sxp.show(cmd, out)
except IOError, ex:
raise XendError(str(ex))
finally:
if out: out.close()
class XendVnetInfo:
vifctl_ops = {'up': 'vif.add', 'down': 'vif.del'}
def __init__(self, config):
self.config = config
self.id = sxp.child_value(config, 'id')
self.id = str(self.id)
self.bridge = sxp.child_value(config, 'bridge')
if not self.bridge:
self.bridge = "vnet%s" % self.id
self.vnetif = sxp.child_value(config, 'vnetif')
if not self.vnetif:
self.vnetif = "vnetif%s" % self.id
def sxpr(self):
return self.config
def configure(self):
log.info("Configuring vnet %s", self.id)
val = vnet_cmd(['vnet.add'] + sxp.children(self.config))
Brctl.bridge_create(self.bridge)
Brctl.vif_bridge_add({'bridge': self.bridge, 'vif': self.vnetif})
return val
def delete(self):
log.info("Deleting vnet %s", self.id)
Brctl.vif_bridge_rem({'bridge': self.bridge, 'vif': self.vnetif})
Brctl.bridge_del(self.bridge)
return vnet_cmd(['vnet.del', self.id])
def vifctl(self, op, vif, vmac):
try:
fn = self.vifctl_ops[op]
return vnet_cmd([fn, ['vnet', self.id], ['vif', vif], ['vmac', vmac]])
except XendError:
log.warning("vifctl failed: op=%s vif=%s mac=%s", op, vif, vmac)
class XendVnet:
"""Index of all vnets. Singleton.
"""
dbpath = "vnet"
def __init__(self):
# Table of vnet info indexed by vnet id.
self.vnet = {}
self.db = XendDB.XendDB(self.dbpath)
vnets = self.db.fetchall("")
for config in vnets.values():
info = XendVnetInfo(config)
self.vnet[info.id] = info
try:
info.configure()
except XendError, ex:
log.warning("Failed to configure vnet %s: %s", str(info.id), str(ex))
def vnet_of_bridge(self, bridge):
"""Get the vnet for a bridge (if any).
@param bridge: bridge name
@return vnet or None
"""
for v in self.vnet.values():
if v.bridge == bridge:
return v
else:
return None
def vnet_ls(self):
"""List all vnet ids.
"""
return self.vnet.keys()
def vnets(self):
"""List all vnets.
"""
return self.vnet.values()
def vnet_get(self, id):
"""Get a vnet.
@param id: vnet id
"""
id = str(id)
return self.vnet.get(id)
def vnet_create(self, config):
"""Create a vnet.
@param config: config
"""
info = XendVnetInfo(config)
self.vnet[info.id] = info
self.db.save(info.id, info.sxpr())
info.configure()
def vnet_delete(self, id):
"""Delete a vnet.
@param id: vnet id
"""
info = self.vnet_get(id)
if info:
del self.vnet[id]
self.db.delete(id)
info.delete()
def instance():
global inst
try:
inst
except:
inst = XendVnet()
return inst
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