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'''This file manages the statistics collected by the BCFG2 Server'''
__revision__ = '$Revision$'
from lxml.etree import XML, SubElement, Element, XMLSyntaxError
from time import asctime, localtime, time
import logging, lxml.etree
class Statistics(object):
'''Manages the memory and file copy of statistics collected about client runs'''
__min_write_delay__ = 30
def __init__(self, filename):
self.filename = filename
self.element = Element('Dummy')
self.dirty = 0
self.lastwrite = 0
self.logger = logging.getLogger('Bcfg2.Server.Statistics')
self.ReadFromFile()
def WriteBack(self, force=0):
'''Write statistics changes back to persistent store'''
if (self.dirty and (self.lastwrite + self.__min_write_delay__ <= time()) ) \
or force:
#syslog(LOG_INFO, "Statistics: Updated statistics.xml")
try:
fout = open(self.filename, 'w')
except IOError, ioerr:
self.logger.error("Failed to open %s for writing: %s" % (self.filename, ioerr))
else:
fout.write(lxml.etree.tostring(self.element))
fout.close()
self.dirty = 0
self.lastwrite = time()
def ReadFromFile(self):
'''Reads current state regarding statistics'''
try:
fin = open(self.filename, 'r')
data = fin.read()
fin.close()
self.element = XML(data)
self.dirty = 0
#syslog(LOG_INFO, "Statistics: Read in statistics.xml")
except (IOError, XMLSyntaxError):
self.logger.error("Creating new statistics file %s"%(self.filename))
self.element = Element('ConfigStatistics')
self.WriteBack()
self.dirty = 0
def updateStats(self, xml, client):
'''Updates the statistics of a current node with new data'''
# Current policy:
# - Keep latest clean run for clean nodes
# - Keep latest clean and dirty run for dirty nodes
newstat = xml.find('Statistics')
if newstat.get('state') == 'clean':
node_dirty = 0
else:
node_dirty = 1
# Find correct node entry in stats data
# The following list comprehension should be guarenteed to return at
# most one result
nodes = [elem for elem in self.element.findall('Node') if elem.get('name') == client]
nummatch = len(nodes)
if nummatch == 0:
# Create an entry for this node
node = SubElement(self.element, 'Node', name=client)
elif nummatch == 1 and not node_dirty:
# Delete old instance
self.element.remove(nodes[0])
node = SubElement(self.element, 'Node', name=client)
elif nummatch == 1 and node_dirty:
# Delete old dirty statistics entry
node = nodes[0]
for elem in [elem for elem in node.findall('Statistics') if elem.get('state') == 'dirty']:
node.remove(elem)
else:
# Shouldn't be reached
self.logger.error("Duplicate node entry for %s"%(client))
# Set current time for stats
newstat.set('time', asctime(localtime()))
# Add statistic
node.append(newstat)
# Set dirty
self.dirty = 1
self.WriteBack()
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