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Try to fix the race condition in a less-spaghetti way

This commit is contained in:
Joshua Boniface 2018-06-11 18:45:37 -04:00
parent f9af787ddd
commit 768dcdd480
1 changed files with 9 additions and 14 deletions
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19
VMInstance.py
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@ -46,25 +46,13 @@ class VMInstance:
@zk.DataWatch('/domains/{}/hypervisor'.format(self.domuuid)) @zk.DataWatch('/domains/{}/hypervisor'.format(self.domuuid))
def watch_hypervisor(data, stat, event=""): def watch_hypervisor(data, stat, event=""):
print(data.decode('ascii')) print(data.decode('ascii'))
try:
if self.hypervisor != data.decode('ascii'):
self.hypervisor = data.decode('ascii')
self.state = self.zk.get('/domains/{}/state'.format(self.domuuid))[0].decode('ascii')
self.manage_vm_state() self.manage_vm_state()
except Exception as e:
print(e)
# Watch for changes to the state field in Zookeeper # Watch for changes to the state field in Zookeeper
@zk.DataWatch('/domains/{}/state'.format(self.domuuid)) @zk.DataWatch('/domains/{}/state'.format(self.domuuid))
def watch_state(data, stat, event=""): def watch_state(data, stat, event=""):
print(data.decode('ascii')) print(data.decode('ascii'))
try:
if self.state != data.decode('ascii'):
self.state = data.decode('ascii')
self.hypervisor = self.zk.get('/domains/{}/hypervisor'.format(self.domuuid))[0].decode('ascii')
self.manage_vm_state() self.manage_vm_state()
except Exception as e:
print(e)
# Get data functions # Get data functions
def getstate(self): def getstate(self):
@ -243,6 +231,13 @@ class VMInstance:
# Main function to manage a VM (taking only self) # Main function to manage a VM (taking only self)
# #
def manage_vm_state(self): def manage_vm_state(self):
# Just a short delay to avoid race conditions
time.sleep(0.5)
# Get the current values from zookeeper
self.state = self.zk.get('/domains/{}/state'.format(self.domuuid))[0].decode('ascii')
self.hypervisor = self.zk.get('/domains/{}/hypervisor'.format(self.domuuid))[0].decode('ascii')
# Check the current state of the VM # Check the current state of the VM
try: try:
if self.dom != None: if self.dom != None: