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gmetad_gmondReader.py
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gmetad_gmondReader.py
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#/*******************************************************************************
#* Portions Copyright (C) 2008 Novell, Inc. All rights reserved.
#*
#* Redistribution and use in source and binary forms, with or without
#* modification, are permitted provided that the following conditions are met:
#*
#* - Redistributions of source code must retain the above copyright notice,
#* this list of conditions and the following disclaimer.
#*
#* - Redistributions in binary form must reproduce the above copyright notice,
#* this list of conditions and the following disclaimer in the documentation
#* and/or other materials provided with the distribution.
#*
#* - Neither the name of Novell, Inc. nor the names of its
#* contributors may be used to endorse or promote products derived from this
#* software without specific prior written permission.
#*
#* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
#* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
#* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
#* ARE DISCLAIMED. IN NO EVENT SHALL Novell, Inc. OR THE CONTRIBUTORS
#* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
#* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
#* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
#* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
#* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
#* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
#* POSSIBILITY OF SUCH DAMAGE.
#*
#* Authors: Matt Ryan (mrayn novell.com)
#* Brad Nicholes (bnicholes novell.com)
#******************************************************************************/
import threading
import xml.sax
import socket
import time
import logging
import zlib
from gmetad_config import GmetadConfig, getConfig
from gmetad_random import getRandomInterval
from gmetad_data import DataStore
from gmetad_data import Element
class GmondContentHandler(xml.sax.ContentHandler):
''' This class implements the XML parser used to parse XML data from a gmond cluster. '''
def __init__(self):
# Initialize the parser and the class object.
xml.sax.ContentHandler.__init__(self)
self._elemStack = []
self._elemStackLen = 0
self._ancestry = []
def startElement(self, tag, attrs):
''' This methods creates an element based on XML tags and inserts it into the data store. '''
ds = DataStore()
# Create a new node based on the XML attributes.
e = Element(tag, attrs)
# If this is the head tag for the XML dump, initialize the data store
if 'GANGLIA_XML' == tag:
ds.acquireLock(self)
self._elemStack.append(ds.getNode()) # Fetch the root node. It has already been set into the tree.
self._elemStackLen += 1
cfg = getConfig()
# We'll go ahead and update any existing GRID tag with a new one (new time) even if one already exists.
e = Element('GRID', {'NAME':cfg[GmetadConfig.GRIDNAME], 'AUTHORITY':cfg[GmetadConfig.AUTHORITY], 'LOCALTIME':'%d' % time.time()})
self._ancestry.append('GANGLIA_XML')
# Insert the new node into the data store at the appropriate location
self._elemStack.append(ds.setNode(e, self._elemStack[self._elemStackLen-1]))
# If this is a cluster or nested grid node, then keep track of the data store path to this node.
if (len(self._ancestry) < 2 or (len(self._ancestry) == 2 and e.id in ['GRID', 'CLUSTER'])):
self._ancestry.append('%s:%s'%(e.id,e.getAttr('name')))
self._elemStackLen += 1
def endElement(self, tag):
# Release the data store lock of we hit the end of the XML dump
if tag == 'GANGLIA_XML':
DataStore().releaseLock(self)
self._elemStack.pop()
self._elemStackLen -= 1
def getClusterAncestry(self):
return self._ancestry
class GmondReader(threading.Thread):
''' This class implements a cluster reader thread that will periodically ping the cluster
for all of it's data. '''
def __init__(self,dataSource,name=None,target=None,args=(),kwargs={}):
# Intialize the thread
threading.Thread.__init__(self,name,target,args,kwargs)
self._cond = threading.Condition()
self._shuttingDown = False
self.dataSource = dataSource
self.lastKnownGoodHost = 0
logging.debug('Reader created for cluster %s' % self.dataSource.name)
def _getEndpoint(self, hostspec, port=8649):
hostinfo = hostspec.split(':')
if len(hostinfo) > 1:
port = int(hostinfo[1])
return (hostinfo[0], port)
def run(self):
ds = DataStore()
while not self._shuttingDown:
connected = False
# Create a socket and connect to the cluster data source.
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect( self._getEndpoint(self.dataSource.hosts[self.lastKnownGoodHost]) )
connected = True
except socket.error:
# Keep track of the last good data source within the cluster. If we can't reconnect to the
# same data source, try the next one in the list.
curidx = self.lastKnownGoodHost
while True:
curidx += 1
if curidx >= len(self.dataSource.hosts):
curidx = 0
if curidx == self.lastKnownGoodHost: break
try:
sock.connect( self._getEndpoint(self.dataSource.hosts[curidx]) )
self.lastKnownGoodHost = curidx
connected=True
break
except socket.error:
pass
if connected:
logging.info('Querying data source %s via host %s' % (self.dataSource.name, self.dataSource.hosts[self.lastKnownGoodHost]))
xmlbuf = ''
while True:
# Read all of the XML data from the data source.
buf = sock.recv(8192)
if not buf:
break
xmlbuf += buf
sock.close()
# These are the gzip header magic numbers, per RFC 1952 section 2.3.1
if xmlbuf[0:2] == '\x1f\x8b':
# 32 is a magic number in zlib.h for autodetecting the zlib or gzip header
xmlbuf = zlib.decompress(xmlbuf, zlib.MAX_WBITS + 32)
# Create an XML parser and parse the buffer
gch = GmondContentHandler()
xml.sax.parseString(xmlbuf, gch)
# Notify the data store that all updates for the cluster are finished.
clusterNode = ds.getNode(gch.getClusterAncestry())
if clusterNode is not None:
clusterNode.setAttr('status', 'up')
else:
logging.error('Could not connect to any host for data source %s' % self.dataSource.name)
ds = DataStore()
cfg = getConfig()
gridKey = Element.generateKey(['GRID',cfg[GmetadConfig.GRIDNAME]])
clusterKey = Element.generateKey(['CLUSTER', self.dataSource.name])
gridNode = ds.getNode([str(ds.rootElement), gridKey])
clusterNode = None
if gridNode is not None and str(gridNode) == gridKey:
try:
clusterNode = gridNode[clusterKey]
except KeyError:
clusterNode = Element('CLUSTER', {'NAME':self.dataSource.name, 'LOCALTIME':'%d' % time.time()})
ds.setNode(clusterNode, gridNode)
if clusterNode is not None:
clusterNode.setAttr('status', 'down')
#clusterNode.localtime = time.time()
ds.updateFinished(clusterNode)
if self._shuttingDown:
break
# Go to sleep for a while.
self._cond.acquire()
self._cond.wait(getRandomInterval(self.dataSource.interval))
self._cond.release()
def shutdown(self):
# Release all locks and shut down the thread.
self._shuttingDown = True
self._cond.acquire()
self._cond.notifyAll()
self._cond.release()
self.join()