pvc/pvcd.py

144 lines
4.5 KiB
Python
Executable File

#!/usr/bin/env python3
# pvcd.py - PVC hypervisor node daemon
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################
import kazoo.client
import libvirt
import sys
import socket
import uuid
import VMInstance
import NodeInstance
import time
import atexit
import apscheduler.schedulers.background
import ansiiprint
# ANSII colours for output
class bcolours:
PURPLE = '\033[95m'
BLUE = '\033[94m'
GREEN = '\033[92m'
YELLOW = '\033[93m'
RED = '\033[91m'
ENDC = '\033[0m'
BOLD = '\033[1m'
UNDERLINE = '\033[4m'
def help():
print(bcolours.BOLD + "pvcd - Parallel Virtual Cluster management daemon" + bcolours.ENDC)
# exit(0)
help()
# Connect to local zookeeper
zk = kazoo.client.KazooClient(hosts='127.0.0.1:2181')
try:
zk.start()
except:
print(bcolours.RED + "Failed to connect to local Zookeeper instance" + bcolours.ENDC)
exit(1)
def zk_listener(state):
if state == kazoo.client.KazooState.LOST:
cleanup()
exit(2)
elif state == kazoo.client.KazooState.SUSPENDED:
cleanup()
exit(2)
else:
pass
zk.add_listener(zk_listener)
myhostname = socket.gethostname()
mynodestring = '/nodes/%s' % myhostname
def cleanup():
try:
update_timer.shutdown()
if t_node[myhostname].getstate() != 'flush':
zk.set('/nodes/{}/state'.format(myhostname), 'stop'.encode('ascii'))
zk.stop()
zk.close()
except:
pass
atexit.register(cleanup)
# Check if our node exists in Zookeeper, and create it if not
if zk.exists('/nodes/{}'.format(myhostname)):
print("> Node is " + bcolours.GREEN + "present" + bcolours.ENDC + " in Zookeeper.")
else:
print("> Node is " + bcolours.RED + "absent" + bcolours.ENDC + " in Zookeeper; adding new node.")
keepalive_time = int(time.time())
zk.create('/domains/{}'.format(myhostname), 'hypervisor'.encode('ascii'))
zk.create('/domains/{}/state'.format(myhostname), 'stop'.encode('ascii'))
zk.create('/domains/{}/cpucount'.format(myhostname), '0'.encode('ascii'))
zk.create('/domains/{}/memfree'.format(myhostname), '0'.encode('ascii'))
zk.create('/domains/{}/cpuload'.format(myhostname), '0.0'.encode('ascii'))
zk.create('/domains/{}/runningdomains'.format(myhostname), ''.encode('ascii'))
zk.create('/domains/{}/keepalive'.format(myhostname), str(keepalive_time).encode('ascii'))
t_node = dict()
s_domain = dict()
node_list = []
domain_list = []
@zk.ChildrenWatch('/nodes')
def updatenodes(new_node_list):
global node_list
node_list = new_node_list
print('Node list: ' + bcolours.BLUE + '{}'.format(' '.join(node_list)) + bcolours.ENDC)
for node in node_list:
if node in t_node:
t_node[node].updatenodelist(t_node)
else:
t_node[node] = NodeInstance.NodeInstance(node, t_node, s_domain, zk)
@zk.ChildrenWatch('/domains')
def updatedomains(new_domain_list):
global domain_list
domain_list = new_domain_list
print('Domain list: ' + bcolours.BLUE + '{}'.format(' '.join(domain_list)) + bcolours.ENDC)
for domain in domain_list:
if not domain in s_domain:
s_domain[domain] = VMInstance.VMInstance(domain, zk, t_node[myhostname]);
for node in node_list:
if node in t_node:
t_node[node].updatedomainlist(s_domain)
# 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=5)
update_timer.start()
# Tick loop
while True:
try:
time.sleep(0.1)
except:
break