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Fix bug with DataWatches holding up instance del 

Fixes a very esoteric bug I was having with duplicate class instances
not being reaped properly due to held-open DataWatch elements.
Workaround for the bug(?) described in
https://github.com/python-zk/kazoo/issues/525
This commit is contained in:
Joshua Boniface 2018-10-01 22:43:14 -04:00
parent fc0c07695b
commit 5c44b8a754
1 changed files with 42 additions and 7 deletions
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49
router-daemon/pvcrd/VXNetworkInstance.py
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@ -57,27 +57,47 @@ class VXNetworkInstance():
self.createNetwork() self.createNetwork()
# Zookeper handlers for changed states # Zookeper handlers for changed states
@zk_conn.DataWatch('/networks/{}'.format(self.vni)) @self.zk_conn.DataWatch('/networks/{}'.format(self.vni))
def watch_network_description(data, stat, event=''): def watch_network_description(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.description != data.decode('ascii'): if data and self.description != data.decode('ascii'):
self.old_description = self.description self.old_description = self.description
self.description = data.decode('ascii') self.description = data.decode('ascii')
@zk_conn.DataWatch('/networks/{}/domain'.format(self.vni)) @self.zk_conn.DataWatch('/networks/{}/domain'.format(self.vni))
def watch_network_domain(data, stat, event=''): def watch_network_domain(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.domain != data.decode('ascii'): if data and self.domain != data.decode('ascii'):
domain = data.decode('ascii') domain = data.decode('ascii')
self.domain = domain self.domain = domain
@zk_conn.DataWatch('/networks/{}/ip_network'.format(self.vni)) @self.zk_conn.DataWatch('/networks/{}/ip_network'.format(self.vni))
def watch_network_ip_network(data, stat, event=''): def watch_network_ip_network(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.ip_network != data.decode('ascii'): if data and self.ip_network != data.decode('ascii'):
ip_network = data.decode('ascii') ip_network = data.decode('ascii')
self.ip_network = ip_network self.ip_network = ip_network
self.ip_cidrnetmask = ip_network.split('/')[-1] self.ip_cidrnetmask = ip_network.split('/')[-1]
@zk_conn.DataWatch('/networks/{}/ip_gateway'.format(self.vni)) @self.zk_conn.DataWatch('/networks/{}/ip_gateway'.format(self.vni))
def watch_network_gateway(data, stat, event=''): def watch_network_gateway(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.ip_gateway != data.decode('ascii'): if data and self.ip_gateway != data.decode('ascii'):
orig_gateway = self.ip_gateway orig_gateway = self.ip_gateway
self.ip_gateway = data.decode('ascii') self.ip_gateway = data.decode('ascii')
@ -86,8 +106,13 @@ class VXNetworkInstance():
self.removeGatewayAddress() self.removeGatewayAddress()
self.createGatewayAddress() self.createGatewayAddress()
@zk_conn.DataWatch('/networks/{}/dhcp_flag'.format(self.vni)) @self.zk_conn.DataWatch('/networks/{}/dhcp_flag'.format(self.vni))
def watch_network_dhcp_status(data, stat, event=''): def watch_network_dhcp_status(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.dhcp_flag != data.decode('ascii'): if data and self.dhcp_flag != data.decode('ascii'):
self.dhcp_flag = ( data.decode('ascii') == 'True' ) self.dhcp_flag = ( data.decode('ascii') == 'True' )
if self.dhcp_flag and self.this_router.network_state == 'primary': if self.dhcp_flag and self.this_router.network_state == 'primary':
@ -95,13 +120,23 @@ class VXNetworkInstance():
elif self.this_router.network_state == 'primary': elif self.this_router.network_state == 'primary':
self.stopDHCPServer() self.stopDHCPServer()
@zk_conn.DataWatch('/networks/{}/dhcp_start'.format(self.vni)) @self.zk_conn.DataWatch('/networks/{}/dhcp_start'.format(self.vni))
def watch_network_dhcp_start(data, stat, event=''): def watch_network_dhcp_start(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.dhcp_start != data.decode('ascii'): if data and self.dhcp_start != data.decode('ascii'):
self.dhcp_start = data.decode('ascii') self.dhcp_start = data.decode('ascii')
@zk_conn.DataWatch('/networks/{}/dhcp_end'.format(self.vni)) @self.zk_conn.DataWatch('/networks/{}/dhcp_end'.format(self.vni))
def watch_network_dhcp_end(data, stat, event=''): def watch_network_dhcp_end(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.dhcp_end != data.decode('ascii'): if data and self.dhcp_end != data.decode('ascii'):
self.dhcp_end = data.decode('ascii') self.dhcp_end = data.decode('ascii')