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Convert NodeInstance from having an internal "daemon" to using the APScheduler library

This commit is contained in:
Joshua Boniface 2018-06-06 14:16:52 -04:00
parent 8f31f49252
commit 66fe258655
2 changed files with 89 additions and 103 deletions
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160
NodeInstance.py
View File

@ -20,17 +20,15 @@
#
###############################################################################
import os, sys, socket, time, threading, libvirt, kazoo.client
import os, sys, socket, time, libvirt, kazoo.client
class NodeInstance(threading.Thread):
class NodeInstance():
def __init__(self, name, t_node, s_domain, zk):
super(NodeInstance, self).__init__()
# Passed-in variables on creation
self.zkey = '/nodes/%s' % name
self.zk = zk
self.name = name
self.state = 'stop'
self.stop_thread = threading.Event()
self.t_node = t_node
self.active_node_list = []
self.flushed_node_list = []
@ -88,10 +86,6 @@ class NodeInstance(threading.Thread):
def updatedomainlist(self, s_domain):
self.s_domain = s_domain
# Shutdown the thread
def stop(self):
self.stop_thread.set()
# Flush all VMs on the host
def flush(self):
for domain in self.domain_list:
@ -143,11 +137,7 @@ class NodeInstance(threading.Thread):
self.zk.set("/nodes/" + self.name + "/state", 'start'.encode('ascii'))
def run(self):
if self.name == socket.gethostname():
self.setup_local_node()
def setup_local_node(self):
def update_zookeeper(self):
# Connect to libvirt
libvirt_name = "qemu:///system"
conn = libvirt.open(libvirt_name)
@ -170,87 +160,79 @@ class NodeInstance(threading.Thread):
else:
self.state = 'flush'
while True:
# Toggle state management of all VMs and remove any non-running VMs
for domain, instance in self.s_domain.items():
if instance.inshutdown == False and domain in self.domain_list:
instance.manage_vm_state()
if instance.dom == None:
# Toggle state management of all VMs and remove any non-running VMs
for domain, instance in self.s_domain.items():
if instance.inshutdown == False and domain in self.domain_list:
instance.manage_vm_state()
if instance.dom == None:
try:
self.domain_list.remove(domain)
except:
pass
else:
try:
state = instance.dom.state()[0]
except:
state = libvirt.VIR_DOMAIN_NOSTATE
if state != libvirt.VIR_DOMAIN_RUNNING:
try:
self.domain_list.remove(domain)
except:
pass
else:
try:
state = instance.dom.state()[0]
except:
state = libvirt.VIR_DOMAIN_NOSTATE
if state != libvirt.VIR_DOMAIN_RUNNING:
try:
self.domain_list.remove(domain)
except:
pass
# Set our information in zookeeper
self.memfree = conn.getFreeMemory()
self.cpuload = os.getloadavg()[0]
try:
self.zk.set(self.zkey + '/memfree', str(self.memfree).encode('ascii'))
self.zk.set(self.zkey + '/cpuload', str(self.cpuload).encode('ascii'))
self.zk.set(self.zkey + '/runningdomains', ' '.join(self.domain_list).encode('ascii'))
except:
if self.stop_thread.is_set():
return
# Set our information in zookeeper
self.memfree = conn.getFreeMemory()
self.cpuload = os.getloadavg()[0]
try:
self.zk.set(self.zkey + '/memfree', str(self.memfree).encode('ascii'))
self.zk.set(self.zkey + '/cpuload', str(self.cpuload).encode('ascii'))
self.zk.set(self.zkey + '/runningdomains', ' '.join(self.domain_list).encode('ascii'))
except:
return
print(">>> %s - Free memory: %s | Load: %s" % ( time.strftime("%d/%m/%Y %H:%M:%S"), self.memfree, self.cpuload ))
print("Active domains: %s" % self.domain_list)
print(">>> %s - Free memory: %s | Load: %s" % ( time.strftime("%d/%m/%Y %H:%M:%S"), self.memfree, self.cpuload ))
print("Active domains: %s" % self.domain_list)
# Update our local node lists
for node_name in self.t_node:
# Update our local node lists
for node_name in self.t_node:
try:
state, stat = self.zk.get('/nodes/%s/state' % node_name)
node_state = state.decode('ascii')
except:
node_state = 'stop'
if node_state == 'start' and node_name not in self.active_node_list:
self.active_node_list.append(node_name)
try:
state, stat = self.zk.get('/nodes/%s/state' % node_name)
node_state = state.decode('ascii')
except:
node_state = 'stop'
if node_state == 'start' and node_name not in self.active_node_list:
self.active_node_list.append(node_name)
try:
self.flushed_node_list.remove(node_name)
except ValueError:
pass
try:
self.inactive_node_list.remove(node_name)
except ValueError:
pass
if node_state == 'flush' and node_name not in self.flushed_node_list:
self.flushed_node_list.append(node_name)
try:
self.active_node_list.remove(node_name)
except ValueError:
pass
try:
self.inactive_node_list.remove(node_name)
except ValueError:
pass
if node_state != 'start' and node_state != 'flush' and node_name not in self.inactive_node_list:
self.inactive_node_list.append(node_name)
try:
self.active_node_list.remove(node_name)
except ValueError:
pass
try:
self.flushed_node_list.remove(node_name)
except ValueError:
pass
print('Active nodes: %s' % self.active_node_list)
print('Flushed nodes: %s' % self.flushed_node_list)
print('Inactive nodes: %s' % self.inactive_node_list)
# Sleep for 9s but with quick interruptability
for x in range(0,90):
time.sleep(0.1)
if self.stop_thread.is_set():
sys.exit(0)
self.flushed_node_list.remove(node_name)
except ValueError:
pass
try:
self.inactive_node_list.remove(node_name)
except ValueError:
pass
if node_state == 'flush' and node_name not in self.flushed_node_list:
self.flushed_node_list.append(node_name)
try:
self.active_node_list.remove(node_name)
except ValueError:
pass
try:
self.inactive_node_list.remove(node_name)
except ValueError:
pass
if node_state != 'start' and node_state != 'flush' and node_name not in self.inactive_node_list:
self.inactive_node_list.append(node_name)
try:
self.active_node_list.remove(node_name)
except ValueError:
pass
try:
self.flushed_node_list.remove(node_name)
except ValueError:
pass
print('Active nodes: %s' % self.active_node_list)
print('Flushed nodes: %s' % self.flushed_node_list)
print('Inactive nodes: %s' % self.inactive_node_list)

32
pvcd.py
View File

@ -20,8 +20,7 @@
#
###############################################################################
from kazoo.client import KazooClient
from kazoo.client import KazooState
import kazoo.client
import libvirt
import sys
import socket
@ -29,8 +28,8 @@ import uuid
import VMInstance
import NodeInstance
import time
import threading
import atexit
import apscheduler.schedulers.background
def help():
print("pvcd - Parallel Virtual Cluster management daemon")
@ -38,8 +37,8 @@ def help():
help()
# Connect to zookeeper
zk = KazooClient(hosts='127.0.0.1:2181')
# Connect to local zookeeper
zk = kazoo.client.KazooClient(hosts='127.0.0.1:2181')
try:
zk.start()
except:
@ -47,10 +46,10 @@ except:
exit(1)
def zk_listener(state):
if state == KazooState.LOST:
if state == kazoo.client.KazooState.LOST:
cleanup()
exit(2)
elif state == KazooState.SUSPENDED:
elif state == kazoo.client.KazooState.SUSPENDED:
cleanup()
exit(2)
else:
@ -63,9 +62,8 @@ myhostname = socket.gethostname()
mynodestring = '/nodes/%s' % myhostname
def cleanup():
t_node[myhostname].stop()
time.sleep(0.2)
try:
update_timer.shutdown()
if t_node[myhostname].getstate() != 'flush':
zk.set('/nodes/' + myhostname + '/state', 'stop'.encode('ascii'))
zk.stop()
@ -75,6 +73,7 @@ def cleanup():
atexit.register(cleanup)
# Check if our node exists in Zookeeper, and create it if not
if zk.exists('%s' % mynodestring):
print("Node is present in Zookeeper")
@ -114,13 +113,18 @@ def updatedomains(new_domain_list):
if node in t_node:
t_node[node].updatedomainlist(s_domain)
t_node[myhostname].start()
time.sleep(0.2)
# Set up our update function
this_node = t_node[myhostname]
update_zookeeper = this_node.update_zookeeper
# Create timer to update this node in Zookeeper
update_timer = apscheduler.schedulers.background.BackgroundScheduler()
update_timer.add_job(update_zookeeper, 'interval', seconds=2)
update_timer.start()
# Tick loop
while True:
# Tick loop
try:
time.sleep(0.1)
except:
cleanup()
exit(0)
break