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 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()
# 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()
