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CuemsNodeConf.py
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CuemsNodeConf.py
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import netifaces
import time
import os.path
from os import system
import sys
import subprocess
from zeroconf import IPVersion, ServiceInfo, ServiceListener, ServiceBrowser, Zeroconf, ZeroconfServiceTypes
import logging
from .CuemsAvahiListener import CuemsAvahiListener
from .CuemsNode import CuemsNode, CuemsNodeDict
from ..ConfigManager import ConfigManager
from ..XmlReaderWriter import XmlReader, XmlWriter
CUEMS_CONF_PATH = '/etc/cuems/'
MAP_SCHEMA_FILE = 'network_map.xsd'
MAP_FILE = 'network_map.xml'
CUEMS_SERVICE_TEMPLATES_PATH = '/usr/share/cuems/'
CUEMS_SERVICE_FILE = 'cuems.service'
CUEMS_MASTER_LOCK_FILE = 'master.lock'
'''
logging.basicConfig(level=logging.DEBUG,
format='%(name)s: %(message)s',
)
'''
class CuemsNodeConf():
def get_ip():
iface = netifaces.gateways()['default'][netifaces.AF_INET][1]
return netifaces.ifaddresses(iface)[netifaces.AF_INET][0]['addr']
nodes = CuemsNodeDict()
def __init__(self, ip=get_ip()):
self.logger = logging.getLogger('Cuems-NodeConf')
# Conf load manager
try:
self.cm = ConfigManager(path=CUEMS_CONF_PATH, nodeconf=True)
except FileNotFoundError:
self.logger.critical(
'Node config file could not be found. Exiting !!!!!')
exit(-1)
self.xsd_path = os.path.join( CUEMS_CONF_PATH, MAP_SCHEMA_FILE)
self.map_path = os.path.join( CUEMS_CONF_PATH, MAP_FILE)
self.zeroconf = Zeroconf(ip_version=IPVersion.V4Only)
self.ip = ip
self.services = ['_cuems_nodeconf._tcp.local.']
self.start_avahi_listener()
self.node = self.retreive_local_node()
# Check for first run flag in service file
if self.node.node_type == CuemsNode.NodeType.firstrun:
self.logger.debug("First time conf file detected, triying to autoconfigure node")
self.set_node_type()
else:
self.logger.debug(f"Allready configured as {self.node.node_type.name}")
# If I am master finally wait a bit for slaves to appear on the net
if self.node.node_type == CuemsNode.NodeType.master:
time.sleep(self.cm.node_conf['nodeconf_timeout'] / 1000)
# publish avahi alias as master.local
self.publish_master_alias()
if self.listener.nodes.firstruns:
self.logger.debug('Waiting for some other "first-run" nodes')
while self.listener.nodes.firstruns:
time.sleep(0.5)
self.check_nodes()
try:
self.write_network_map()
except Exception as e:
self.logger.exception(e)
self.update_master_lock_file(os.path.join( CUEMS_CONF_PATH, CUEMS_MASTER_LOCK_FILE))
if self.node.node_type == CuemsNode.NodeType.master:
sys.exit(100)
elif self.node.node_type == CuemsNode.NodeType.slave:
sys.exit(101)
def start_avahi_listener(self):
# self.listener = CuemsAvahiListener(callback=self.callback)
self.listener = CuemsAvahiListener()
self.browser = ServiceBrowser(
self.zeroconf, self.services, self.listener)
time.sleep(2)
def set_node_type(self):
if not self.listener.nodes.masters:
self.logger.debug('No master node on the network, I become MASTER!')
self.node.node_type = CuemsNode.NodeType.master
# Copy master node service template
source = os.path.join(CUEMS_SERVICE_TEMPLATES_PATH, CUEMS_SERVICE_FILE) + '.master'
target = os.path.join('/etc/avahi/services/', CUEMS_SERVICE_FILE)
command = f'sudo cp {source} {target}'
os.system(command)
else:
self.logger.debug('Master present on the in network WE STAY SLAVE')
self.node.node_type = CuemsNode.NodeType.slave
# Copy slave node service template
source = os.path.join(CUEMS_SERVICE_TEMPLATES_PATH, CUEMS_SERVICE_FILE) + '.slave'
target = os.path.join('/etc/avahi/services/', CUEMS_SERVICE_FILE)
os.system(f'sudo cp {source} {target}')
def write_network_map(self, map=None):
if not map:
map = self.listener.nodes
writer = XmlWriter(schema = self.xsd_path, xmlfile = self.map_path, xml_root_tag='CuemsNetworkMap')
writer.write_from_object(map)
def read_network_map(self):
reader = XmlReader(schema = self.xsd_path, xmlfile = self.map_path)
self.network_map = CuemsNodeDict()
nodes = reader.read_to_objects()
for node in nodes:
self.network_map[node.mac] = node
print("---")
print("Nodes read from existing XML network map:")
for item, value in self.network_map.items():
print(value)
print("---")
def cleanup(self):
try:
os.remove(os.path.join(CUEMS_CONF_PATH, self.cm.show_lock_file))
except FileNotFoundError:
pass
def callback(self, caller_node=None, action=CuemsAvahiListener.Action.ADD):
self.logger.debug(f" {action} callback!!!, Node: {caller_node} ")
self.check_nodes()
def check_nodes(self):
# self.logger.debug(self.listener.nodes)
if self.listener.nodes.masters:
self.logger.debug(f"Master node(s):\n{self.listener.nodes.masters}")
else:
raise Exception("we have no master!!")
if self.listener.nodes.slaves:
self.logger.debug(
f"We have {len(self.listener.nodes.slaves)} slaves")
self.logger.debug(f"Slave node(s):\n{self.listener.nodes.slaves}")
else:
self.logger.debug("we have no slaves")
def check_first_run(self):
for node in self.listener.nodes.firstruns:
if node.ip == self.ip:
return True
return False
def retreive_local_node(self):
retries = 0
while retries < 3:
for node in self.listener.nodes.values():
if node.ip == self.ip:
found = True
return node
time.sleep(0.5)
retries += 1
raise Exception('Local node avahi service not detected')
def publish_master_alias(self):
#avahi-publish -a -f -R master.local 192.168.1.12
try:
subprocess.Popen(["avahi-publish", "-aR", "master.local", self.ip], close_fds=True)
self.logger.debug(f"Publishing master.local alias in {self.ip}")
except Exception as e:
self.logger.debug(f"error publishing alias, {type(e)}. {e}")
def update_master_lock_file(self, path):
if self.node.node_type == CuemsNode.NodeType.master:
print("master")
if not os.path.isfile(path):
print("not file")
try:
with open(path, 'a') as results_file:
results_file.write('\n')
except:
self.logger.warning("could not write master lock file")
else:
if os.path.isfile(path):
try:
os.remove(path)
except OSError:
self.logger.warning("could not delete master lock file")