from boto.exception import EC2ResponseError
from ConfigParser import ConfigParser
from xmlbuilder import XMLBuilder
-from xml.etree import ElementTree as ET
+from lxml import etree as ET
from sqlobject import *
import sys
#
cloud = {}
+##
+# The location of the RelaxNG schema.
+#
+EUCALYPTUS_RSPEC_SCHEMA='/etc/sfa/eucalyptus.rng'
+
##
# A representation of an Eucalyptus instance. This is a support class
# for instance <-> slice mapping.
# @param botoConn A connection to Eucalyptus.
#
def reserveInstance(self, botoConn):
- print >>sys.stderr, 'Reserving an instance. image: %s, kernel: %s, ramdisk: %s, type: %s, key: %s' % \
- (self.image_id, self.kernel_id, self.ramdisk_id, self.inst_type, self.key_pair)
+ print >>sys.stderr, 'Reserving an instance: image: %s, kernel: ' \
+ '%s, ramdisk: %s, type: %s, key: %s' % \
+ (self.image_id, self.kernel_id, self.ramdisk_id,
+ self.inst_type, self.key_pair)
+
+ # XXX The return statement is for testing. REMOVE in production
+ #return
try:
reservation = botoConn.run_instances(self.image_id,
configParser.read(['/etc/sfa/eucalyptus_aggregate.conf', 'eucalyptus_aggregate.conf'])
if len(configParser.sections()) < 1:
print >>sys.stderr, 'No cloud defined in the config file'
- raise 'Cannot find cloud definition in configuration file.'
+ raise Exception('Cannot find cloud definition in configuration file.')
# Only read the first section.
cloudSec = configParser.sections()[0]
Slice.createTable(ifNotExists=True)
EucaInstance.createTable(ifNotExists=True)
+ # Make sure the schema exists.
+ if not os.path.exists(EUCALYPTUS_RSPEC_SCHEMA):
+ err = 'Cannot location schema at %s' % EUCALYPTUS_RSPEC_SCHEMA
+ print >>sys.stderr, err
+ raise Exception(err)
+
##
# Creates a connection to Eucalytpus. This function is inspired by
# the make_connection() in Euca2ools.
# @param cloud A dictionary containing data about a
# cloud (ex. clusters, ip)
def __init__(self, cloud):
- self.eucaRSpec = XMLBuilder()
+ self.eucaRSpec = XMLBuilder(format = True, tab_step = " ")
self.cloudInfo = cloud
##
- # Creates the ClusterSpec stanza.
+ # Creates a request stanza.
+ #
+ # @param num The number of instances to create.
+ # @param image The disk image id.
+ # @param kernel The kernel image id.
+ # @param keypair Key pair to embed.
+ # @param ramdisk Ramdisk id (optional).
+ #
+ def __requestXML(self, num, image, kernel, keypair, ramdisk = ''):
+ xml = self.eucaRSpec
+ with xml.request:
+ with xml.instances:
+ xml << str(num)
+ with xml.kernel_image(id=kernel):
+ xml << ''
+ if ramdisk == '':
+ with xml.ramdisk:
+ xml << ''
+ else:
+ with xml.ramdisk(id=ramdisk):
+ xml << ''
+ with xml.disk_image(id=image):
+ xml << ''
+ with xml.keypair:
+ xml << keypair
+
+ ##
+ # Creates the cluster stanza.
#
# @param clusters Clusters information.
#
def __clustersXML(self, clusters):
+ cloud = self.cloudInfo
xml = self.eucaRSpec
+
for cluster in clusters:
instances = cluster['instances']
- with xml.ClusterSpec(id=cluster['name'], ip=cluster['ip']):
- for inst in instances:
- with xml.Node(instanceType=inst[0]):
- with xml.FreeSlot:
- xml << str(inst[1])
- with xml.MaxAllow:
- xml << str(inst[2])
- with xml.NumCore:
- xml << str(inst[3])
- with xml.Mem:
- xml << str(inst[4])
- with xml.DiskSpace(unit='GB'):
- xml << str(inst[5])
+ with xml.cluster(id=cluster['name']):
+ with xml.ipv4:
+ xml << cluster['ip']
+ with xml.vm_types:
+ for inst in instances:
+ with xml.vm_type(name=inst[0]):
+ with xml.free_slots:
+ xml << str(inst[1])
+ with xml.max_instances:
+ xml << str(inst[2])
+ with xml.cores:
+ xml << str(inst[3])
+ with xml.memory(unit='MB'):
+ xml << str(inst[4])
+ with xml.disk_space(unit='GB'):
+ xml << str(inst[5])
+ if inst[0] == 'm1.small':
+ self.__requestXML(1, 'emi-88760F45', 'eki-F26610C6', 'cortex')
+ if 'instances' in cloud and inst[0] in cloud['instances']:
+ existingEucaInstances = cloud['instances'][inst[0]]
+ with xml.euca_instances:
+ for eucaInst in existingEucaInstances:
+ with xml.euca_instance(id=eucaInst['id']):
+ with xml.state:
+ xml << eucaInst['state']
+ with xml.public_dns:
+ xml << eucaInst['public_dns']
+ with xml.keypair:
+ xml << eucaInst['key']
##
# Creates the Images stanza.
#
def __imagesXML(self, images):
xml = self.eucaRSpec
- with xml.Images:
+ with xml.images:
for image in images:
- with xml.Image(id=image.id):
- with xml.Type:
+ with xml.image(id=image.id):
+ with xml.type:
xml << image.type
- with xml.Arch:
+ with xml.arch:
xml << image.architecture
- with xml.State:
+ with xml.state:
xml << image.state
with xml.location:
xml << image.location
#
def __keyPairsXML(self, keypairs):
xml = self.eucaRSpec
- with xml.KeyPairs:
+ with xml.keypairs:
for key in keypairs:
- with xml.Key:
+ with xml.keypair:
xml << key.name
##
xml = self.eucaRSpec
cloud = self.cloudInfo
- with xml.RSpec(name='eucalyptus'):
- with xml.Capacity:
- with xml.CloudSpec(id=cloud['name'], ip=cloud['ip']):
- self.__keyPairsXML(cloud['keypairs'])
- self.__imagesXML(cloud['images'])
- self.__clustersXML(cloud['clusters'])
- with xml.Request:
- with xml.CloudSpec(id=cloud['name'], ip=cloud['ip']):
- with xml.Credential(type='X509'):
- xml << 'cred'
- with xml.Node(instanceType='m1.small', number='1'):
- with xml.Kernel:
- xml << 'eki-F26610C6'
- with xml.Ramdisk:
- xml << ''
- with xml.DiskImage:
- xml << 'emi-88760F45'
- with xml.Key:
- xml << 'cortex'
+ with xml.RSpec(type='eucalyptus'):
+ with xml.cloud(id=cloud['name']):
+ with xml.ipv4:
+ xml << cloud['ip']
+ self.__keyPairsXML(cloud['keypairs'])
+ self.__imagesXML(cloud['images'])
+ self.__clustersXML(cloud['clusters'])
return str(xml)
##
# Key Pairs
keyPairs = conn.get_all_key_pairs()
cloud['keypairs'] = keyPairs
+
+ if hrn:
+ instanceId = []
+ instances = []
+
+ # Get the instances that belong to the given slice from sqlite3
+ # XXX use getOne() in production because the slice's hrn is supposed
+ # to be unique. For testing, uniqueness is turned off in the db.
+ theSlice = list(Slice.select(Slice.q.slice_hrn == hrn))[-1]
+ for instance in theSlice.instances:
+ instanceId.append(instance.instance_id)
+
+ # Get the information about those instances using their ids.
+ if len(instanceId) > 0:
+ reservations = conn.get_all_instances(instanceId)
+ else:
+ reservations = []
+ for reservation in reservations:
+ for instance in reservation.instances:
+ instances.append(instance)
+
+ # Construct a dictory for the EucaRSpecBuilder
+ instancesDict = {}
+ for instance in instances:
+ instList = instancesDict.setdefault(instance.instance_type, [])
+ instInfoDict = {}
+
+ instInfoDict['id'] = instance.id
+ instInfoDict['public_dns'] = instance.public_dns_name
+ instInfoDict['state'] = instance.state
+ instInfoDict['key'] = instance.key_name
+
+ instList.append(instInfoDict)
+ cloud['instances'] = instancesDict
+
except EC2ResponseError, ec2RespErr:
errTree = ET.fromstring(ec2RespErr.body)
errMsgE = errTree.find('.//Message')
rspec = EucaRSpecBuilder(cloud).toXML()
+ # Remove the instances records so next time they won't
+ # show up.
+ if 'instances' in cloud:
+ del cloud['instances']
+
return rspec
"""
print >>sys.stderr, 'Error: Cannot create a connection to Eucalyptus'
return False
+ # Validate RSpec
+ schemaXML = ET.parse(EUCALYPTUS_RSPEC_SCHEMA)
+ rspecValidator = ET.RelaxNG(schemaXML)
+ rspecXML = ET.XML(xml)
+ if not rspecValidator(rspecXML):
+ error = rspecValidator.error_log.last_error
+ message = '%s (line %s)' % (error.message, error.line)
+ # XXX: InvalidRSpec is new. Currently, I am not working with Trunk code.
+ #raise InvalidRSpec(message)
+ raise Exception(message)
+
# Get the slice from db or create one.
- # XXX: For testing purposes, I'll just create the slice.
- #s = Slice.select(Slice.q.slice_hrn == hrn).getOne(None)
- #if s is None:
- s = Slice(slice_hrn = hrn)
-
- # Process the RSpec
- rspecXML = RSpec(xml)
- rspecDict = rspecXML.toDict()
- request = rspecDict['RSpec']['Request']
- for cloudSpec in request:
- cloudSpec = cloudSpec['CloudSpec']
- for cloudReqInfo in cloudSpec:
- for nodeReq in cloudReqInfo['Node']:
- instKernel = nodeReq['Kernel'][0]
- instDiskImg = nodeReq['DiskImage'][0]
- instRamDisk = nodeReq['Ramdisk'][0]
- instKey = nodeReq['Key'][0]
- instType = nodeReq['instanceType']
- numInst = int(nodeReq['number'])
-
- # Ramdisk is optional.
- if isinstance(instRamDisk, dict):
- instRamDisk = None
-
- # Create the instances
- for i in range(0, numInst):
- eucaInst = EucaInstance(slice = s,
- kernel_id = instKernel,
- image_id = instDiskImg,
- ramdisk_id = instRamDisk,
- key_pair = instKey,
- inst_type = instType)
- eucaInst.reserveInstance(conn)
+ s = Slice.select(Slice.q.slice_hrn == hrn).getOne(None)
+ if s is None:
+ s = Slice(slice_hrn = hrn)
+
+ # Process any changes in existing instance allocation
+ pendingRmInst = []
+ for sliceInst in s.instances:
+ pendingRmInst.append(sliceInst.instance_id)
+ existingInstGroup = rspecXML.findall('.//euca_instances')
+ for instGroup in existingInstGroup:
+ for existingInst in instGroup:
+ if existingInst.get('id') in pendingRmInst:
+ pendingRmInst.remove(existingInst.get('id'))
+ for inst in pendingRmInst:
+ print >>sys.stderr, 'Instance %s will be terminated' % inst
+ dbInst = EucaInstance.select(EucaInstance.q.instance_id == inst).getOne(None)
+ dbInst.destroySelf()
+ conn.terminate_instances(pendingRmInst)
+
+ # Process new instance requests
+ requests = rspecXML.findall('.//request')
+ for req in requests:
+ vmTypeElement = req.getparent()
+ instType = vmTypeElement.get('name')
+ numInst = int(req.find('instances').text)
+ instKernel = req.find('kernel_image').get('id')
+ instDiskImg = req.find('disk_image').get('id')
+ instKey = req.find('keypair').text
+
+ ramDiskElement = req.find('ramdisk')
+ ramDiskAttr = ramDiskElement.attrib
+ if 'id' in ramDiskAttr:
+ instRamDisk = ramDiskAttr['id']
+ else:
+ instRamDisk = None
+
+ # Create the instances
+ for i in range(0, numInst):
+ eucaInst = EucaInstance(slice = s,
+ kernel_id = instKernel,
+ image_id = instDiskImg,
+ ramdisk_id = instRamDisk,
+ key_pair = instKey,
+ inst_type = instType)
+ eucaInst.reserveInstance(conn)
return True
def main():
init_server()
- r = RSpec()
- r.parseFile(sys.argv[1])
- rspec = r.toDict()
- create_slice(None,'planetcloud.pc.test',rspec)
- #rspec = get_rspec('euca', 'hrn:euca', 'oring_hrn')
+
+ theRSpec = None
+ with open(sys.argv[1]) as xml:
+ theRSpec = xml.read()
+ create_slice(None, 'planetcloud.pc.test', theRSpec)
+
+ #rspec = get_rspec('euca', 'planetcloud.pc.test', 'planetcloud.pc.marcoy')
#print rspec
if __name__ == "__main__":
git://git.onelab.eu / sfa.git / blobdiff