def startListenning(self, certificatePath, port):
"""
Starts the network service and creates a server connection.
Args:
certificatePath: the server.crt and server.key files path
port: the listenning port
Returns:
Nothing
"""
self.__loadBalancer = SimpleLoadBalancer(self.__dbConnector)
self.__networkManager = NetworkManager(certificatePath)
self.__webPort = port
self.__networkManager.startNetworkService()
self.__webPacketHandler = ClusterServerPacketHandler(
self.__networkManager)
self.__vmServerPacketHandler = VMServerPacketHandler(
self.__networkManager)
self.__networkManager.listenIn(port, self.__webCallback, True)
self.__vmServerCallback = VMServerCallback(self)
def startListenning(self, certificatePath, port):
"""
Starts the network service and creates a server connection.
Args:
certificatePath: the server.crt and server.key files path
port: the listenning port
Returns:
Nothing
"""
self.__loadBalancer = SimpleLoadBalancer(self.__dbConnector)
self.__networkManager = NetworkManager(certificatePath)
self.__webPort = port
self.__networkManager.startNetworkService()
self.__webPacketHandler = ClusterServerPacketHandler(self.__networkManager)
self.__vmServerPacketHandler = VMServerPacketHandler(self.__networkManager)
self.__networkManager.listenIn(port, self.__webCallback, True)
self.__vmServerCallback = VMServerCallback(self)
class ClusterServerReactor(WebPacketReactor, VMServerPacketReactor):
'''
These objects react to packages received from the website or from
a virtual machine server.
'''
def __init__(self, timeout):
"""
Initializes the reactor's state.
Args:
None
"""
self.__webCallback = WebCallback(self)
self.__finished = False
self.__timeout = timeout
def connectToDatabase(self, mysqlRootsPassword, dbName, dbUser, dbPassword, scriptPath):
"""
Establishes a connection with the cluster server database.
Args:
mysqlRootsPassword: MySQL root's password
dbName: the cluster server database's name
dbUser: the cluster server database's user name
dbPassword: the cluster server database's user password
scriptPath: the cluster server database's initialization script path
"""
configurator = DBConfigurator(mysqlRootsPassword)
configurator.runSQLScript(dbName, scriptPath)
configurator.addUser(dbUser, dbPassword, dbName, True)
self.__dbConnector = ClusterServerDatabaseConnector(dbUser, dbPassword, dbName)
self.__dbConnector.connect()
self.__dbConnector.resetVMServersStatus()
def startListenning(self, certificatePath, port):
"""
Starts the network service and creates a server connection.
Args:
certificatePath: the server.crt and server.key files path
port: the listenning port
Returns:
Nothing
"""
self.__loadBalancer = SimpleLoadBalancer(self.__dbConnector)
self.__networkManager = NetworkManager(certificatePath)
self.__webPort = port
self.__networkManager.startNetworkService()
self.__webPacketHandler = ClusterServerPacketHandler(self.__networkManager)
self.__vmServerPacketHandler = VMServerPacketHandler(self.__networkManager)
self.__networkManager.listenIn(port, self.__webCallback, True)
self.__vmServerCallback = VMServerCallback(self)
def processWebIncomingPacket(self, packet):
"""
Processes a packet received from the web server.
Args:
packet: the packet to process
Returns:
Nothing
"""
data = self.__webPacketHandler.readPacket(packet)
if (data["packet_type"] == WEB_PACKET_T.REGISTER_VM_SERVER) :
self.__registerVMServer(data)
elif (data["packet_type"] == WEB_PACKET_T.QUERY_VM_SERVERS_STATUS) :
self.__sendVMServerStatusData()
elif (data["packet_type"] == WEB_PACKET_T.UNREGISTER_OR_SHUTDOWN_VM_SERVER) :
self.__unregisterOrShutdownVMServer(data)
elif (data["packet_type"] == WEB_PACKET_T.BOOTUP_VM_SERVER) :
self.__bootUpVMServer(data)
elif (data["packet_type"] == WEB_PACKET_T.VM_BOOT_REQUEST):
self.__bootUpVM(data)
elif (data["packet_type"] == WEB_PACKET_T.HALT) :
self.__halt(data)
elif (data["packet_type"] == WEB_PACKET_T.QUERY_VM_DISTRIBUTION) :
self.__sendVMDistributionData()
elif (data["packet_type"] == WEB_PACKET_T.QUERY_ACTIVE_VM_DATA) :
self.__requestVNCConnectionData()
def __requestVNCConnectionData(self):
"""
Sends a VNC connection data request packet to all the active virtual machine servers
Args:
None
Returns:
Nothing
"""
# Create a VNC connection data packet
p = self.__vmServerPacketHandler.createVMServerDataRequestPacket(VMSRVR_PACKET_T.QUERY_ACTIVE_VM_DATA)
# Fetch the active virtual machine server's IP addresses and ports
connectionData = self.__dbConnector.getActiveVMServersConnectionData()
for cd in connectionData :
self.__networkManager.sendPacket(cd["ServerIP"], cd["ServerPort"], p)
def __halt(self, data):
"""
Shuts down the cluster (including the virtual machine servers).
Args:
haltVMServers: if True, all the active virtual machines will be destroyed and the virtual machine
servers will be shut down. If false, the virtual machine servers will wait until there are no
active virtual machines, and then they'll be shut down.
"""
vmServersConnectionData = self.__dbConnector.getActiveVMServersConnectionData()
if (vmServersConnectionData != None) :
args = dict()
args["Halt"] = data["HaltVMServers"]
args["Unregister"] = False
for connectionData in vmServersConnectionData :
args["ServerNameOrIPAddress"] = connectionData["ServerIP"]
self.__unregisterOrShutdownVMServer(args)
self.__finished = True
def __registerVMServer(self, data):
"""
Processes a virtual machine server registration packet.
Args:
data: the received virtual machine server registration packet.
Returns:
Nothing
"""
try :
# Check if the IP address is assigned to another virtual machine server
server_id = self.__dbConnector.getVMServerID(data["VMServerIP"])
if (server_id != None) :
raise Exception("The IP address " + data["VMServerIP"] + " is assigned to another VM server")
# Check if the name is assigned to another virtual machine server
server_id = self.__dbConnector.getVMServerID(data["VMServerName"])
if (server_id != None) :
raise Exception("The name " + data["VMServerName"] + " is assigned to another VM server")
# Establish a connection
self.__networkManager.connectTo(data["VMServerIP"], data["VMServerPort"],
20, self.__vmServerCallback, True, True)
while not self.__networkManager.isConnectionReady(data["VMServerIP"], data["VMServerPort"]) :
sleep(0.1)
# Register the server on the database
self.__dbConnector.registerVMServer(data["VMServerName"], data["VMServerIP"],
data["VMServerPort"])
# Command the virtual machine server to tell us its state
p = self.__vmServerPacketHandler.createVMServerDataRequestPacket(VMSRVR_PACKET_T.SERVER_STATUS_REQUEST)
self.__networkManager.sendPacket(data["VMServerIP"], data["VMServerPort"], p)
# Everything went fine
p = self.__webPacketHandler.createCommandExecutedPacket(data["CommandID"])
except Exception as e:
p = self.__webPacketHandler.createVMServerRegistrationErrorPacket(data["VMServerIP"],
data["VMServerPort"],
data["VMServerName"], str(e), data["CommandID"])
self.__networkManager.sendPacket('', self.__webPort, p)
def __unregisterOrShutdownVMServer(self, data):
"""
Processes a virtual machine server unregistration or shutdown packet.
Args:
key: the virtual machine server's IPv4 address or its name.
halt: if True, the virtual machine server will be shut down immediately. If false, it'll
wait until all the virtual machines are shut down, and then it will finally be shut down.
unregister: if True, the virtual machine server will be deleted from the cluster server's database.
"""
key = data["ServerNameOrIPAddress"]
halt = data["Halt"]
unregister = data["Unregister"]
if data.has_key("CommandID") :
useCommandID = True
commandID = data["CommandID"]
else :
useCommandID = False
# Shut down the server (if necessary)
serverId = self.__dbConnector.getVMServerID(key)
if (serverId != None) :
serverData = self.__dbConnector.getVMServerBasicData(serverId)
status = serverData["ServerStatus"]
if (status == SERVER_STATE_T.READY or status == SERVER_STATE_T.BOOTING) :
if not halt :
p = self.__vmServerPacketHandler.createVMServerShutdownPacket()
else :
p = self.__vmServerPacketHandler.createVMServerHaltPacket()
self.__networkManager.sendPacket(serverData["ServerIP"], serverData["ServerPort"], p)
# Close the network connection
self.__networkManager.closeConnection(serverData["ServerIP"], serverData["ServerPort"])
if (not unregister) :
self.__dbConnector.updateVMServerStatus(serverId, SERVER_STATE_T.SHUT_DOWN)
self.__dbConnector.deleteVMServerStatistics(serverId)
else :
# Update the virtual machine server's state
self.__dbConnector.deleteVMServer(key)
if (useCommandID) :
# Create a command executed packet and send it to the website
p = self.__webPacketHandler.createCommandExecutedPacket(commandID)
self.__networkManager.sendPacket('', self.__webPort, p)
else :
# Error
if (unregister) :
packet_type = WEB_PACKET_T.VM_SERVER_UNREGISTRATION_ERROR
else :
packet_type = WEB_PACKET_T.VM_SERVER_SHUTDOWN_ERROR
errorMessage = "The virtual machine server with name or IP address <<{0}>> is not registered".format(key)
p = self.__webPacketHandler.createVMServerGenericErrorPacket(packet_type, key, errorMessage, commandID)
self.__networkManager.sendPacket('', self.__webPort, p)
def __updateVMServerStatus(self, data):
"""
Processes a virtual machine server's status packet.
Args:
data: the received packet
Returns:
Nothing
"""
# Fetch the virtual machine server's ID
serverID = None
while (serverID == None) :
serverID = self.__dbConnector.getVMServerID(data["VMServerIP"])
if (serverID == None) :
sleep(0.1)
# Change its status
self.__dbConnector.updateVMServerStatus(serverID, SERVER_STATE_T.READY)
self.__dbConnector.setVMServerStatistics(serverID, data["ActiveDomains"])
def __bootUpVMServer(self, data):
"""
Processes a virtual machine server boot packet.
Args:
serverNameOrIPAddress: the virtual machine server's name or IPv4 address.
Returns:
Nothing
"""
try :
serverNameOrIPAddress = data["ServerNameOrIPAddress"]
serverId = self.__dbConnector.getVMServerID(serverNameOrIPAddress)
if (serverId == None) :
raise Exception("The virtual machine server is not registered")
serverData = self.__dbConnector.getVMServerBasicData(serverId)
# Connect to the virtual machine server
self.__networkManager.connectTo(serverData["ServerIP"], serverData["ServerPort"],
20, self.__vmServerCallback, True, True)
while not self.__networkManager.isConnectionReady(serverData["ServerIP"], serverData["ServerPort"]) :
sleep(0.1)
# Change its status
self.__dbConnector.updateVMServerStatus(serverId, SERVER_STATE_T.BOOTING)
# Send the status request
p = self.__vmServerPacketHandler.createVMServerDataRequestPacket(VMSRVR_PACKET_T.SERVER_STATUS_REQUEST)
self.__networkManager.sendPacket(serverData["ServerIP"], serverData["ServerPort"], p)
# Everything went fine
p = self.__webPacketHandler.createCommandExecutedPacket(data["CommandID"])
except Exception as e:
p = self.__webPacketHandler.createVMServerGenericErrorPacket(WEB_PACKET_T.VM_SERVER_BOOTUP_ERROR,
serverNameOrIPAddress, str(e), data["CommandID"])
self.__networkManager.sendPacket('', self.__webPort, p)
def __sendVMServerStatusData(self):
"""
Processes a virtual machine server data request packet.
Args:
None
Returns:
Nothing
"""
self.__sendStatusData(self.__dbConnector.getVMServerBasicData, self.__webPacketHandler.createVMServerStatusPacket)
def __sendVMDistributionData(self):
"""
Processes a virtual machine distribution data packet
Args:
None
Returns:
Nothing
"""
self.__sendStatusData(self.__dbConnector.getHostedImages, self.__webPacketHandler.createVMDistributionPacket)
def __sendStatusData(self, queryMethod, packetCreationMethod):
"""
Processes a data request packet.
Args:
queryMethod: the method that extracts the data from the database
packetCreationMethod: the method that creates the packet
Returns:
Nothing
"""
segmentSize = 5
outgoingData = []
serverIDs = self.__dbConnector.getVMServerIDs()
if (len(serverIDs) == 0) :
segmentCounter = 0
segmentNumber = 0
sendLastSegment = True
else :
segmentCounter = 1
segmentNumber = (len(serverIDs) / segmentSize)
if (len(serverIDs) % segmentSize != 0) :
segmentNumber += 1
sendLastSegment = True
else :
sendLastSegment = False
for serverID in serverIDs :
row = queryMethod(serverID)
if (isinstance(row, dict)) :
outgoingData.append(row)
else :
outgoingData += row
if (len(outgoingData) >= segmentSize) :
# Flush
packet = packetCreationMethod(segmentCounter, segmentNumber, outgoingData)
self.__networkManager.sendPacket('', self.__webPort, packet)
outgoingData = []
segmentCounter += 1
# Send the last segment
if (sendLastSegment) :
packet = packetCreationMethod(segmentCounter, segmentNumber, outgoingData)
self.__networkManager.sendPacket('', self.__webPort, packet)
def __bootUpVM(self, data):
"""
Processes a virtual machine boot request packet.
Args:
vmName: the virtual machine's ID
userID: the user's unique identifier
Returns:
Nothing
"""
vmID = data["VMID"]
userID = data["UserID"]
# Choose the virtual machine server that will host the image
(serverID, errorMessage) = self.__loadBalancer.assignVMServer(vmID)
if (errorMessage != None) :
# Something went wrong => warn the user
p = self.__webPacketHandler.createVMBootFailurePacket(vmID, errorMessage, data["CommandID"])
self.__networkManager.sendPacket('', self.__webPort, p)
else :
# Ask the virtual machine server to boot up the VM
p = self.__vmServerPacketHandler.createVMBootPacket(vmID, userID, data["CommandID"])
serverData = self.__dbConnector.getVMServerBasicData(serverID)
self.__networkManager.sendPacket(serverData["ServerIP"], serverData["ServerPort"], p)
# Register the boot command
self.__dbConnector.registerVMBootCommand(data["CommandID"], data["VMID"])
# Everything went fine
#p = self.__webPacketHandler.createCommandExecutedPacket(data["CommandID"])
#self.__networkManager.sendPacket('', self.__webPort, p)
def processVMServerIncomingPacket(self, packet):
"""
Processes a packet sent from a virtual machine server.
Args:
packet: the packet to process
Returns:
Nothing
"""
data = self.__vmServerPacketHandler.readPacket(packet)
if (data["packet_type"] == VMSRVR_PACKET_T.SERVER_STATUS) :
self.__updateVMServerStatus(data)
elif (data["packet_type"] == VMSRVR_PACKET_T.DOMAIN_CONNECTION_DATA) :
self.__sendVMConnectionData(data)
elif (data["packet_type"] == VMSRVR_PACKET_T.ACTIVE_VM_DATA) :
self.__sendVNCConnectionData(packet)
def processServerReconnectionData(self, ipAddress, reconnection_status) :
"""
Processes a reconnection status event
Args:
ipAddress: the connection's IPv4 address
port: the connection's port
reconnection_status: the reconnection process' status
Returns:
Nothing
"""
if (reconnection_status == RECONNECTION_T.RECONNECTING) :
status = SERVER_STATE_T.RECONNECTING
elif (reconnection_status == RECONNECTION_T.REESTABLISHED) :
status = SERVER_STATE_T.READY
else :
status = SERVER_STATE_T.CONNECTION_TIMED_OUT
serverID = self.__dbConnector.getVMServerID(ipAddress)
self.__dbConnector.updateVMServerStatus(serverID, status)
def __sendVNCConnectionData(self, packet):
"""
Processes a VNC connection data packet
Args:
packet: the packet to process
Returns:
Nothing
"""
p = self.__webPacketHandler.createActiveVMsDataPacket(packet)
self.__networkManager.sendPacket('', self.__webPort, p)
def __sendVMConnectionData(self, data):
"""
Processes a virtual machine connection data packet.
Args:
data: the packet to process' data.
Returns:
Nothing
"""
# Delete the boot command from the database
self.__dbConnector.removeVMBootCommand(data["CommandID"])
p = self.__webPacketHandler.createVMConnectionDataPacket(data["VNCServerIP"],
data["VNCServerPort"], data["VNCServerPassword"], data["CommandID"])
self.__networkManager.sendPacket('', self.__webPort, p)
def monitorVMBootCommands(self):
errorMessage = "Could not boot up virtual machine (timeout error)"
while not self.__finished :
data = self.__dbConnector.getOldVMBootCommandID(self.__timeout)
if (not self.__finished and data == None) :
# Be careful with this: if MySQL server receives too many queries per second,
# the reactor's database connection will be closed.
sleep(1)
else :
# Create a virtual machine boot error packet
p = self.__webPacketHandler.createVMBootFailurePacket(data[1], errorMessage, data[0])
self.__networkManager.sendPacket('', self.__webPort, p)
def hasFinished(self):
"""
Indicates if the cluster server has finished or not.
"""
return self.__finished
def shutdown(self):
"""
Shuts down the cluster server.
Args:
None
Returns:
Nothing
@attention: this method MUST NOT be called from a network thread. If you do so, the application will hang!
"""
self.__networkManager.stopNetworkService()
class ClusterServerReactor(WebPacketReactor, VMServerPacketReactor):
'''
These objects react to packages received from the website or from
a virtual machine server.
'''
def __init__(self, timeout):
"""
Initializes the reactor's state.
Args:
None
"""
self.__webCallback = WebCallback(self)
self.__finished = False
self.__timeout = timeout
def connectToDatabase(self, mysqlRootsPassword, dbName, dbUser, dbPassword,
scriptPath):
"""
Establishes a connection with the cluster server database.
Args:
mysqlRootsPassword: MySQL root's password
dbName: the cluster server database's name
dbUser: the cluster server database's user name
dbPassword: the cluster server database's user password
scriptPath: the cluster server database's initialization script path
"""
configurator = DBConfigurator(mysqlRootsPassword)
configurator.runSQLScript(dbName, scriptPath)
configurator.addUser(dbUser, dbPassword, dbName, True)
self.__dbConnector = ClusterServerDatabaseConnector(
dbUser, dbPassword, dbName)
self.__dbConnector.connect()
self.__dbConnector.resetVMServersStatus()
def startListenning(self, certificatePath, port):
"""
Starts the network service and creates a server connection.
Args:
certificatePath: the server.crt and server.key files path
port: the listenning port
Returns:
Nothing
"""
self.__loadBalancer = SimpleLoadBalancer(self.__dbConnector)
self.__networkManager = NetworkManager(certificatePath)
self.__webPort = port
self.__networkManager.startNetworkService()
self.__webPacketHandler = ClusterServerPacketHandler(
self.__networkManager)
self.__vmServerPacketHandler = VMServerPacketHandler(
self.__networkManager)
self.__networkManager.listenIn(port, self.__webCallback, True)
self.__vmServerCallback = VMServerCallback(self)
def processWebIncomingPacket(self, packet):
"""
Processes a packet received from the web server.
Args:
packet: the packet to process
Returns:
Nothing
"""
data = self.__webPacketHandler.readPacket(packet)
if (data["packet_type"] == WEB_PACKET_T.REGISTER_VM_SERVER):
self.__registerVMServer(data)
elif (data["packet_type"] == WEB_PACKET_T.QUERY_VM_SERVERS_STATUS):
self.__sendVMServerStatusData()
elif (data["packet_type"] ==
WEB_PACKET_T.UNREGISTER_OR_SHUTDOWN_VM_SERVER):
self.__unregisterOrShutdownVMServer(data)
elif (data["packet_type"] == WEB_PACKET_T.BOOTUP_VM_SERVER):
self.__bootUpVMServer(data)
elif (data["packet_type"] == WEB_PACKET_T.VM_BOOT_REQUEST):
self.__bootUpVM(data)
elif (data["packet_type"] == WEB_PACKET_T.HALT):
self.__halt(data)
elif (data["packet_type"] == WEB_PACKET_T.QUERY_VM_DISTRIBUTION):
self.__sendVMDistributionData()
elif (data["packet_type"] == WEB_PACKET_T.QUERY_ACTIVE_VM_DATA):
self.__requestVNCConnectionData()
def __requestVNCConnectionData(self):
"""
Sends a VNC connection data request packet to all the active virtual machine servers
Args:
None
Returns:
Nothing
"""
# Create a VNC connection data packet
p = self.__vmServerPacketHandler.createVMServerDataRequestPacket(
VMSRVR_PACKET_T.QUERY_ACTIVE_VM_DATA)
# Fetch the active virtual machine server's IP addresses and ports
connectionData = self.__dbConnector.getActiveVMServersConnectionData()
for cd in connectionData:
self.__networkManager.sendPacket(cd["ServerIP"], cd["ServerPort"],
p)
def __halt(self, data):
"""
Shuts down the cluster (including the virtual machine servers).
Args:
haltVMServers: if True, all the active virtual machines will be destroyed and the virtual machine
servers will be shut down. If false, the virtual machine servers will wait until there are no
active virtual machines, and then they'll be shut down.
"""
vmServersConnectionData = self.__dbConnector.getActiveVMServersConnectionData(
)
if (vmServersConnectionData != None):
args = dict()
args["Halt"] = data["HaltVMServers"]
args["Unregister"] = False
for connectionData in vmServersConnectionData:
args["ServerNameOrIPAddress"] = connectionData["ServerIP"]
self.__unregisterOrShutdownVMServer(args)
self.__finished = True
def __registerVMServer(self, data):
"""
Processes a virtual machine server registration packet.
Args:
data: the received virtual machine server registration packet.
Returns:
Nothing
"""
try:
# Check if the IP address is assigned to another virtual machine server
server_id = self.__dbConnector.getVMServerID(data["VMServerIP"])
if (server_id != None):
raise Exception("The IP address " + data["VMServerIP"] +
" is assigned to another VM server")
# Check if the name is assigned to another virtual machine server
server_id = self.__dbConnector.getVMServerID(data["VMServerName"])
if (server_id != None):
raise Exception("The name " + data["VMServerName"] +
" is assigned to another VM server")
# Establish a connection
self.__networkManager.connectTo(data["VMServerIP"],
data["VMServerPort"], 20,
self.__vmServerCallback, True,
True)
while not self.__networkManager.isConnectionReady(
data["VMServerIP"], data["VMServerPort"]):
sleep(0.1)
# Register the server on the database
self.__dbConnector.registerVMServer(data["VMServerName"],
data["VMServerIP"],
data["VMServerPort"])
# Command the virtual machine server to tell us its state
p = self.__vmServerPacketHandler.createVMServerDataRequestPacket(
VMSRVR_PACKET_T.SERVER_STATUS_REQUEST)
self.__networkManager.sendPacket(data["VMServerIP"],
data["VMServerPort"], p)
# Everything went fine
p = self.__webPacketHandler.createCommandExecutedPacket(
data["CommandID"])
except Exception as e:
p = self.__webPacketHandler.createVMServerRegistrationErrorPacket(
data["VMServerIP"], data["VMServerPort"], data["VMServerName"],
str(e), data["CommandID"])
self.__networkManager.sendPacket('', self.__webPort, p)
def __unregisterOrShutdownVMServer(self, data):
"""
Processes a virtual machine server unregistration or shutdown packet.
Args:
key: the virtual machine server's IPv4 address or its name.
halt: if True, the virtual machine server will be shut down immediately. If false, it'll
wait until all the virtual machines are shut down, and then it will finally be shut down.
unregister: if True, the virtual machine server will be deleted from the cluster server's database.
"""
key = data["ServerNameOrIPAddress"]
halt = data["Halt"]
unregister = data["Unregister"]
if data.has_key("CommandID"):
useCommandID = True
commandID = data["CommandID"]
else:
useCommandID = False
# Shut down the server (if necessary)
serverId = self.__dbConnector.getVMServerID(key)
if (serverId != None):
serverData = self.__dbConnector.getVMServerBasicData(serverId)
status = serverData["ServerStatus"]
if (status == SERVER_STATE_T.READY
or status == SERVER_STATE_T.BOOTING):
if not halt:
p = self.__vmServerPacketHandler.createVMServerShutdownPacket(
)
else:
p = self.__vmServerPacketHandler.createVMServerHaltPacket()
self.__networkManager.sendPacket(serverData["ServerIP"],
serverData["ServerPort"], p)
# Close the network connection
self.__networkManager.closeConnection(serverData["ServerIP"],
serverData["ServerPort"])
if (not unregister):
self.__dbConnector.updateVMServerStatus(
serverId, SERVER_STATE_T.SHUT_DOWN)
self.__dbConnector.deleteVMServerStatistics(serverId)
else:
# Update the virtual machine server's state
self.__dbConnector.deleteVMServer(key)
if (useCommandID):
# Create a command executed packet and send it to the website
p = self.__webPacketHandler.createCommandExecutedPacket(
commandID)
self.__networkManager.sendPacket('', self.__webPort, p)
else:
# Error
if (unregister):
packet_type = WEB_PACKET_T.VM_SERVER_UNREGISTRATION_ERROR
else:
packet_type = WEB_PACKET_T.VM_SERVER_SHUTDOWN_ERROR
errorMessage = "The virtual machine server with name or IP address <<{0}>> is not registered".format(
key)
p = self.__webPacketHandler.createVMServerGenericErrorPacket(
packet_type, key, errorMessage, commandID)
self.__networkManager.sendPacket('', self.__webPort, p)
def __updateVMServerStatus(self, data):
"""
Processes a virtual machine server's status packet.
Args:
data: the received packet
Returns:
Nothing
"""
# Fetch the virtual machine server's ID
serverID = None
while (serverID == None):
serverID = self.__dbConnector.getVMServerID(data["VMServerIP"])
if (serverID == None):
sleep(0.1)
# Change its status
self.__dbConnector.updateVMServerStatus(serverID, SERVER_STATE_T.READY)
self.__dbConnector.setVMServerStatistics(serverID,
data["ActiveDomains"])
def __bootUpVMServer(self, data):
"""
Processes a virtual machine server boot packet.
Args:
serverNameOrIPAddress: the virtual machine server's name or IPv4 address.
Returns:
Nothing
"""
try:
serverNameOrIPAddress = data["ServerNameOrIPAddress"]
serverId = self.__dbConnector.getVMServerID(serverNameOrIPAddress)
if (serverId == None):
raise Exception("The virtual machine server is not registered")
serverData = self.__dbConnector.getVMServerBasicData(serverId)
# Connect to the virtual machine server
self.__networkManager.connectTo(serverData["ServerIP"],
serverData["ServerPort"], 20,
self.__vmServerCallback, True,
True)
while not self.__networkManager.isConnectionReady(
serverData["ServerIP"], serverData["ServerPort"]):
sleep(0.1)
# Change its status
self.__dbConnector.updateVMServerStatus(serverId,
SERVER_STATE_T.BOOTING)
# Send the status request
p = self.__vmServerPacketHandler.createVMServerDataRequestPacket(
VMSRVR_PACKET_T.SERVER_STATUS_REQUEST)
self.__networkManager.sendPacket(serverData["ServerIP"],
serverData["ServerPort"], p)
# Everything went fine
p = self.__webPacketHandler.createCommandExecutedPacket(
data["CommandID"])
except Exception as e:
p = self.__webPacketHandler.createVMServerGenericErrorPacket(
WEB_PACKET_T.VM_SERVER_BOOTUP_ERROR, serverNameOrIPAddress,
str(e), data["CommandID"])
self.__networkManager.sendPacket('', self.__webPort, p)
def __sendVMServerStatusData(self):
"""
Processes a virtual machine server data request packet.
Args:
None
Returns:
Nothing
"""
self.__sendStatusData(
self.__dbConnector.getVMServerBasicData,
self.__webPacketHandler.createVMServerStatusPacket)
def __sendVMDistributionData(self):
"""
Processes a virtual machine distribution data packet
Args:
None
Returns:
Nothing
"""
self.__sendStatusData(
self.__dbConnector.getHostedImages,
self.__webPacketHandler.createVMDistributionPacket)
def __sendStatusData(self, queryMethod, packetCreationMethod):
"""
Processes a data request packet.
Args:
queryMethod: the method that extracts the data from the database
packetCreationMethod: the method that creates the packet
Returns:
Nothing
"""
segmentSize = 5
outgoingData = []
serverIDs = self.__dbConnector.getVMServerIDs()
if (len(serverIDs) == 0):
segmentCounter = 0
segmentNumber = 0
sendLastSegment = True
else:
segmentCounter = 1
segmentNumber = (len(serverIDs) / segmentSize)
if (len(serverIDs) % segmentSize != 0):
segmentNumber += 1
sendLastSegment = True
else:
sendLastSegment = False
for serverID in serverIDs:
row = queryMethod(serverID)
if (isinstance(row, dict)):
outgoingData.append(row)
else:
outgoingData += row
if (len(outgoingData) >= segmentSize):
# Flush
packet = packetCreationMethod(segmentCounter, segmentNumber,
outgoingData)
self.__networkManager.sendPacket('', self.__webPort, packet)
outgoingData = []
segmentCounter += 1
# Send the last segment
if (sendLastSegment):
packet = packetCreationMethod(segmentCounter, segmentNumber,
outgoingData)
self.__networkManager.sendPacket('', self.__webPort, packet)
def __bootUpVM(self, data):
"""
Processes a virtual machine boot request packet.
Args:
vmName: the virtual machine's ID
userID: the user's unique identifier
Returns:
Nothing
"""
vmID = data["VMID"]
userID = data["UserID"]
# Choose the virtual machine server that will host the image
(serverID, errorMessage) = self.__loadBalancer.assignVMServer(vmID)
if (errorMessage != None):
# Something went wrong => warn the user
p = self.__webPacketHandler.createVMBootFailurePacket(
vmID, errorMessage, data["CommandID"])
self.__networkManager.sendPacket('', self.__webPort, p)
else:
# Ask the virtual machine server to boot up the VM
p = self.__vmServerPacketHandler.createVMBootPacket(
vmID, userID, data["CommandID"])
serverData = self.__dbConnector.getVMServerBasicData(serverID)
self.__networkManager.sendPacket(serverData["ServerIP"],
serverData["ServerPort"], p)
# Register the boot command
self.__dbConnector.registerVMBootCommand(data["CommandID"],
data["VMID"])
# Everything went fine
#p = self.__webPacketHandler.createCommandExecutedPacket(data["CommandID"])
#self.__networkManager.sendPacket('', self.__webPort, p)
def processVMServerIncomingPacket(self, packet):
"""
Processes a packet sent from a virtual machine server.
Args:
packet: the packet to process
Returns:
Nothing
"""
data = self.__vmServerPacketHandler.readPacket(packet)
if (data["packet_type"] == VMSRVR_PACKET_T.SERVER_STATUS):
self.__updateVMServerStatus(data)
elif (data["packet_type"] == VMSRVR_PACKET_T.DOMAIN_CONNECTION_DATA):
self.__sendVMConnectionData(data)
elif (data["packet_type"] == VMSRVR_PACKET_T.ACTIVE_VM_DATA):
self.__sendVNCConnectionData(packet)
def processServerReconnectionData(self, ipAddress, reconnection_status):
"""
Processes a reconnection status event
Args:
ipAddress: the connection's IPv4 address
port: the connection's port
reconnection_status: the reconnection process' status
Returns:
Nothing
"""
if (reconnection_status == RECONNECTION_T.RECONNECTING):
status = SERVER_STATE_T.RECONNECTING
elif (reconnection_status == RECONNECTION_T.REESTABLISHED):
status = SERVER_STATE_T.READY
else:
status = SERVER_STATE_T.CONNECTION_TIMED_OUT
serverID = self.__dbConnector.getVMServerID(ipAddress)
self.__dbConnector.updateVMServerStatus(serverID, status)
def __sendVNCConnectionData(self, packet):
"""
Processes a VNC connection data packet
Args:
packet: the packet to process
Returns:
Nothing
"""
p = self.__webPacketHandler.createActiveVMsDataPacket(packet)
self.__networkManager.sendPacket('', self.__webPort, p)
def __sendVMConnectionData(self, data):
"""
Processes a virtual machine connection data packet.
Args:
data: the packet to process' data.
Returns:
Nothing
"""
# Delete the boot command from the database
self.__dbConnector.removeVMBootCommand(data["CommandID"])
p = self.__webPacketHandler.createVMConnectionDataPacket(
data["VNCServerIP"], data["VNCServerPort"],
data["VNCServerPassword"], data["CommandID"])
self.__networkManager.sendPacket('', self.__webPort, p)
def monitorVMBootCommands(self):
errorMessage = "Could not boot up virtual machine (timeout error)"
while not self.__finished:
data = self.__dbConnector.getOldVMBootCommandID(self.__timeout)
if (not self.__finished and data == None):
# Be careful with this: if MySQL server receives too many queries per second,
# the reactor's database connection will be closed.
sleep(1)
else:
# Create a virtual machine boot error packet
p = self.__webPacketHandler.createVMBootFailurePacket(
data[1], errorMessage, data[0])
self.__networkManager.sendPacket('', self.__webPort, p)
def hasFinished(self):
"""
Indicates if the cluster server has finished or not.
"""
return self.__finished
def shutdown(self):
"""
Shuts down the cluster server.
Args:
None
Returns:
Nothing
@attention: this method MUST NOT be called from a network thread. If you do so, the application will hang!
"""
self.__networkManager.stopNetworkService()
