/** initTables() */
protected void initTables() {
name2obj = target.getName2obj();
if (name2obj == null) {
target.setName2obj(new ConcurrentHashMap<String, VMTRootObject>());
name2obj = target.getName2obj();
}
}
/**
* syncProbe() Called during incremental discovery Rediscover and parse the load balancing virtual
* server object that is represented by the given VirtualApplication object
*
* @param objects List of existing VirtualApplication objects to be rediscovered
*/
private void syncProbe(EList<Object> objects) {
if (!FeaturesManager.vmtMANAGER.isLoadBalancerEnabled()) {
logger.error("Operations Manager is not licensed for Load Balancer targets");
return;
}
if (!objects.isEmpty() && initProbe() != null) {
if (logPrefix == "") logPrefix = target.getNameOrAddress() + " : ";
for (Object object : objects) {
if (!(object instanceof VirtualApplication)) continue;
// Get all the lbv servers from NetScaler appliance
VirtualApplication vApp = (VirtualApplication) object;
DiscoveryExtension discExt = vApp.getDiscoveryExtension();
if (logger.isDebugEnabled())
logger.debug(logPrefix + " rediscovering virtual application " + vApp.toVMTString());
if (discExt instanceof NetScalerVirtualAppDiscExt) { // lbvserver
lbvserver server = NetScalerUtil.getLbvServer(session, vApp.getName(), target, logPrefix);
if (server != null) parseServer(server);
else exceptions = true;
} else if (discExt instanceof NetScalerGslbVirtualAppDiscExt) { // gslb vserver
gslbvserver gslb =
NetScalerUtil.getGslbvServer(session, vApp.getName(), target, logPrefix);
if (gslb != null) parseGslbServer(gslb);
else exceptions = true;
}
}
// If no exceptions clear previous occurrences of DISCOVERY notifications
if (!exceptions) target.clearNotifications(NotificationCategory.DISCOVERY);
}
}
/**
* Set up properties for the given virtual application object representing a NetScaler loading
* balance. and its discovery extension. Create the GslbServiceAgent to capture the lbvserver and
* app services that are configured on this target and are bound to the specified GSLB. Also
* create the transaction commodity sold by the vApp.
*
* @param gslb VirtualApplication for the load balancing server
* @param specificTarget NetScaler appliance target
* @param vServerExt NetScalerGslbVirtualAppDiscExt Discovery extension for the virtual
* application
* @param localName gslb server name to be set as local name in the discovery extension
* @param vAppUuid UUID created for the virtual application
* @param vAppType load balancing service protocol
* @param classname static string "gslbvserver" to set as class name in the discovery extension
* @param lbvServers list of lbvservers configured on the gslb on this target
* @return modified vApp object
*/
private VirtualApplication createGslbVirtualApplication(
VirtualApplication gslb,
VMTTarget specificTarget,
NetScalerGslbVirtualAppDiscExt vServerExt,
String localName,
String vAppUuid,
String vAppType,
String classname,
List<String> lbvServers) {
// set properties in the virtual app and the discovery extension
// and create the transaction commodity sold
gslb =
createVirtualApplication(
gslb,
specificTarget,
vServerExt,
localName, // service name as the local name
"", // there is no IP and port associated with the GSLB
0, // there is no port for the GSLB service
vAppUuid, // uuid for the gslb vapp containing its service name only
vAppType, // service type
NetScalerUtil.GSLB_VSERVER // class name for the poller
);
// agent to represent this service on this target
String agentName =
NetScalerUtil.GSLB_AGENT_PREFIX + gslb.getName() + "-" + target.getNameOrAddress();
GslbServiceAgent lbAgent =
(GslbServiceAgent)
createObject(MediationPackage.eINSTANCE.getGslbServiceAgent(), agentName);
lbAgent.setDisplayName(gslb.getName() + "-" + target.getNameOrAddress());
// discovery extension for the agent
NetScalerGslbServiceAgentDiscExt agentDiscExt =
(NetScalerGslbServiceAgentDiscExt)
lbAgent.createExtension(
DiscoveryExtensionsPackage.eINSTANCE.getNetScalerGslbServiceAgentDiscExt());
// we set the GSLB server name as the local name
setExtProps(
agentDiscExt,
specificTarget,
NetScalerUtil.LB_VSERVER, // class name attribute in the extension used during polling
agentName, // display name attribute in the extension
localName, // local name attribute
localName, // id attribute
logPrefix);
// attach to the vApp
gslb.getAgents().add(lbAgent);
agentDiscExt.getLbvServers().addAll(lbvServers);
if (logger.isDebugEnabled())
logger.debug(
logPrefix
+ gslb.toVMTString()
+ " : create glsb agent on target "
+ target.getNameOrAddress());
return gslb;
}
/**
* syncProbe - main probe Get all the load balancing virtual server objects from NetScaler and
* parse them
*/
private void syncProbe() {
if (!FeaturesManager.vmtMANAGER.isLoadBalancerEnabled()) {
logger.error("Operations Manager is not licensed for Load Balancer targets");
return;
}
if (initProbe() != null) {
if (logPrefix == "") logPrefix = target.getNameOrAddress() + " : ";
// --------- global load balancing servers
// The gslb virtual servers correspond to gslb virtual server applications
// Get all the gslb vservers from NetScaler appliance
gslbvserver[] gslbvServers = NetScalerUtil.getAllGslbvServers(session, target, logPrefix);
if (gslbvServers != null) {
logger.info(
logPrefix
+ "Retrieved "
+ gslbvServers.length
+ " instances of GSLB Virtual Application");
// Parse each server object
for (gslbvserver vServer : gslbvServers) {
VirtualApplication vApp = parseGslbServer(vServer);
if (logger.isDebugEnabled())
logger.debug(logPrefix + " discovered GSLB virtual application " + vApp.toVMTString());
}
} else {
exceptions = true;
}
// -------------- lb vservers
// The lbv servers correspond to virtual load balancing virtual server applications
// Get all the lbv servers from NetScaler appliance
lbvserver[] vServers = NetScalerUtil.getAllLbvServers(session, target, logPrefix);
if (vServers != null) {
logger.info(
logPrefix + "Retrieved " + vServers.length + " instances of Virtual Application");
// Parse each server object
for (lbvserver vServer : vServers) {
VirtualApplication vApp = parseServer(vServer);
if (vApp != null && logger.isDebugEnabled())
logger.debug(logPrefix + " discovered virtual application " + vApp.toVMTString());
}
} else {
exceptions = true;
}
// If no exceptions clear previous occurrences of DISCOVERY notifications
if (!exceptions) target.clearNotifications(NotificationCategory.DISCOVERY);
}
} // end syncProbe()
/**
* initProbe() Initialize name2Obj table - table consisting of the objects discovered
*
* @return VMTTarget
*/
@Override
protected VMTTarget initProbe() {
target = super.initProbe();
// initialize objects map
initTables();
// open a new NetScaler session
session = NetScalerUtil.createSession(target, logPrefix);
if (session == null) {
logger.error(
logPrefix
+ "Could not establish a connection with target at "
+ target.getNameOrAddress()
+ ". Terminating discovery");
return null;
}
exceptions = false;
return target;
}
/**
* createObject handles if the probe created an object with same UUID as another existing object
*
* @param ecls
* @param entityName
* @param entityUuid
* @return VMTRootobject
*/
private VMTRootObject createObject(EClass ecls, String entityName, String entityUuid) {
VMTRootObject obj = null;
VMTRootObject newObj = null;
String finalUuid = null;
if (entityUuid != null) {
finalUuid = REPOSMAN.hashUuid(entityUuid);
}
obj = name2obj.get(entityName);
if (obj == null) {
// this is an initial discovery, check if a different probe created an object with the same
// uuid
obj = REPOSMAN.getObject(finalUuid);
if (obj != null) {
// This object was created by a different probe
if (!obj.eClass().equals(ecls)) {
newObj = createObject(ecls, entityName, finalUuid + entityName);
handleSameUUID(
(VMTManagedEntity) obj,
(VMTManagedEntity) newObj,
entityName,
ecls,
false,
VMTSeverity.MAJOR);
} else {
if (logger.isTraceEnabled() && obj instanceof VirtualApplication)
logger.trace(
target.getNameOrAddress()
+ "### : "
+ obj.toVMTString()
+ " already was created by another probe with uuid "
+ obj.getUuid());
}
} else {
// This is the first object created with such a uuid
obj = (VMTRootObject) ecls.getEPackage().getEFactoryInstance().create(ecls);
if (finalUuid != null) obj.setUuid(finalUuid);
obj.setName(entityName);
if (logger.isTraceEnabled() && obj instanceof VirtualApplication)
logger.trace(
target.getNameOrAddress()
+ ": created NEW object "
+ obj.toVMTString()
+ " with uuid "
+ obj.getUuid());
DISCMAN.incrementCount((VMTManagedEntity) obj);
}
} else if (!obj.eClass().equals(ecls)) {
// object of a different class with the same uuid was created by this probe
// newObj = createObject(ecls, entityName, finalUuid + entityName);
// handleSameUUID((VMTManagedEntity)obj, (VMTManagedEntity)newObj, finalUuid, ecls,
// VMTSeverity.WARNING);
handleSameUUID((VMTManagedEntity) obj, null, entityName, ecls, false, VMTSeverity.MAJOR);
newObj = null;
}
if (newObj != null) obj = newObj;
name2obj.put(entityName, obj);
return obj;
} // end createObject()
/**
* Update the Gslb Agent attached to the Gslb application that the lbvserver is bound to
*
* @param vServerIP
*/
private void updateGslbVAppAgent(String vServerIP, Integer vServerPort) {
// the gslb vApp that this lbvserver is bound to
VirtualApplication gslb = lbvServerVIPToGslbVAppMap.get(vServerIP);
// if (logger.isDebugEnabled())
logger.info(
logPrefix
+ "LB virtual server at VIP "
+ vServerIP
+ " on target "
+ target.getNameOrAddress()
+ " is bound to GSLB "
+ gslb.toVMTString());
// port for the GSLB service
gslb.setPort(vServerPort);
// gslb agent for this target
GslbServiceAgent lbAgent = NetScalerUtil.getTargetAgent(gslb, target);
if (lbAgent == null) {
logger.warn("null gslb service agent for gslb " + gslb.toVMTString());
// TODO: create it ?
}
NetScalerGslbServiceAgentDiscExt lbAgentDiscExt =
(NetScalerGslbServiceAgentDiscExt) lbAgent.getDiscoveryExtension();
Map<String, String> vipToServiceName = lbAgentDiscExt.getVipToLbServiceName();
if (vipToServiceName == null) {
vipToServiceName = new HashMap<String, String>();
lbAgentDiscExt.setVipToLbServiceName(vipToServiceName);
}
vipToServiceName.put(vServerIP, lbvserver_ip2serviceName.get(vServerIP));
Map<String, Map<String, String>> vipToAppServices = lbAgentDiscExt.getVipToAppServices();
if (vipToAppServices == null) {
vipToAppServices = new HashMap<String, Map<String, String>>();
lbAgentDiscExt.setVipToAppServices(vipToAppServices);
}
vipToAppServices.put(vServerIP, ip2NameIPPort);
if (logger.isDebugEnabled()) {
logger.debug(
logPrefix
+ " added vipToServiceName Map : "
+ lbAgentDiscExt.getVipToLbServiceName()
+ " for "
+ lbAgent.toVMTString());
logger.debug(
logPrefix
+ " added vipToAppServices Map : "
+ lbAgentDiscExt.getVipToAppServices()
+ " for "
+ lbAgent.toVMTString());
}
// create IP objects for the app service endpoints.
for (String ip : ip2NameIPPort.keySet()) {
IP serviceIP = DiscoveryUtil.createOrGetIPObj(ip, logPrefix);
if (logger.isDebugEnabled())
logger.debug(
target.getNameOrAddress()
+ " created IP : "
+ serviceIP.toVMTString()
+ " for "
+ ip
+ " :: Name/IP/Port : "
+ ip2NameIPPort.get(ip));
}
}
/**
* Global load balancing virtual server and its bound services
*
* @param vServer
* @return
*/
private VirtualApplication parseGslbServer(gslbvserver vServer) {
if (logger.isTraceEnabled()) logger.trace(logPrefix + vServer);
// Retrieve the gslb virtual server information
String vServerName, vServerUuid, vServerType;
try {
vServerName =
vServer.get_name(); // name of the loading balancing virtual server, is changeable
vServerUuid = "VirtualApplicationUuid" + "_" + vServerName; // create UUID, no target address
// because the same service could be configured on multiple targets
vServerType =
vServer.get_servicetype(); // Protocol used by the service (also called the service type)
if (logger.isDebugEnabled())
logger.debug(
logPrefix
+ "GSLB Load Balancing Server service name "
+ vServerName
+ "::service type "
+ vServerType
+ "::uuid "
+ vServerUuid);
} catch (Exception e) {
exceptions = true;
logger.error(
logPrefix
+ "Failed retrieving gslb virtual server information on target "
+ target.getNameOrAddress(),
e);
return null;
}
// Get the binding objects for the services bound to each load balancer virtual server on the
// appliance
gslbvserver_gslbservice_binding[] bindObjs =
NetScalerUtil.getBoundGslbServices(session, vServerName, target, logPrefix);
if (logger.isTraceEnabled()) {
int length = (bindObjs == null) ? 0 : bindObjs.length;
logger.trace(logPrefix + "GSLB Server " + vServerName + " has " + length + " bound services");
}
List<String> lbvServers = new ArrayList<String>();
if (bindObjs != null) {
try {
for (gslbvserver_gslbservice_binding svcBinding : bindObjs) {
// save all the lb virtual server's ip addresses configured in the gslbvserver in this
// list
// we will encounter the local lb virtual server while parsing the lbvServers in the
// target
// VIP address of the load balancing virtual server
lbvServers.add(svcBinding.get_ipaddress());
}
} catch (Exception ex) {
exceptions = true;
logger.error(
logPrefix + "Failed retrieving information for services bound to gslb " + vServerName,
ex);
ex.printStackTrace();
}
}
if (logger.isDebugEnabled())
logger.debug(
logPrefix
+ "GSLB Server "
+ vServerName
+ " has these local LB virtual server VIPs "
+ lbvServers);
VirtualApplication gslb;
NetScalerGslbVirtualAppDiscExt vServerExt;
synchronized (REPOSMAN) {
// Create the VirtualApplication object
gslb =
(VirtualApplication)
createObject(
AbstractionPackage.eINSTANCE.getVirtualApplication(),
NetScalerUtil.VAPP_PREFIX + vServerName,
vServerUuid);
// create VirtualApp Discovery extension
vServerExt =
(NetScalerGslbVirtualAppDiscExt)
gslb.createExtension(
DiscoveryExtensionsPackage.eINSTANCE.getNetScalerGslbVirtualAppDiscExt());
for (String vserver :
lbvServers) { // add instead of allAll, so the ones added by another target are not
// overwritten
if (!vServerExt.getLbvServers().contains(vserver)) vServerExt.getLbvServers().add(vserver);
}
if (logger.isDebugEnabled())
logger.debug(
logPrefix
+ "GSLB Server "
+ vServerName
+ " saved LB virtual server VIPs "
+ vServerExt.getLbvServers());
// create a map of the lbvservers and the gslb that it is bound to on this target
// we use this to determine if we need to create vApps for
// lbvservers when we encounter them on this target
for (String lbvServer : lbvServers) {
lbvServerVIPToGslbVAppMap.put(lbvServer, gslb);
}
// set properties in the virtual app and the discovery extension
// and create the transaction commodity sold
gslb =
createGslbVirtualApplication(
gslb,
target,
vServerExt,
vServerName, // service name as the local name);
vServerUuid, // uuid for the gslb vapp containing its service name only
vServerType, // service type
NetScalerUtil.GSLB_VSERVER, // class name for the poller
lbvServers // list of lbvservers configured in the gslb on this target
);
}
return gslb;
}
/**
* Validates the Flow target given by attempting to retrieve data
*
* @param target The target to validate
* @return VALIDATED if the target was successfully validated, an error message otherwise
*/
public static String validateFlowTarget(VMTTarget target) {
if (target != null) {
String logPrefix = target.getNameOrAddress() + " : ";
if (!FeaturesManager.vmtMANAGER.isNetworkModeEnabled()) {
logger.warn(logPrefix + "Validation failed");
return UNLICENSED;
}
if ("NETFLOW".equals(target.getVersion())) {
ch.ethz.ssh2.Connection conn = null;
try {
if (logger.isDebugEnabled())
logger.debug(logPrefix + "Validating " + target.getNameOrAddress());
VMTCredentials credentials = target.getCredentials();
if (credentials instanceof UsernamePassword) {
UsernamePassword user = (UsernamePassword) credentials;
String password =
VMTEncryptionUtil.decrypt(
credentials, MediationPackage.eINSTANCE.getUsernamePassword_Password());
conn =
SshUtil.establishConnection(
target.getNameOrAddress(), user.getUsername(), password);
if (conn != null && conn.isAuthenticationComplete()) {
Session ioSess = conn.openSession();
ioSess.execCommand(nFlowDumpCommand);
return VALIDATED;
} else {
logger.warn(logPrefix + "Validation failed");
String reason =
"Cannot establish SSH connection with the flow collector using the credential";
return reason;
}
}
} catch (Exception e) {
logger.warn(logPrefix + "Validation failed");
return e.getClass().getSimpleName();
} finally {
SshUtil.closeConnection(conn, target);
}
} else if ("SFLOW".equals(target.getVersion())) {
String targetAddress = target.getNameOrAddress();
String url = formUrl(targetAddress, SFLOW_REQUEST_IN_JSON);
URL nodesURL;
URLConnection nodesConnection = null;
InputStreamReader in = null;
try {
nodesURL = new java.net.URL(url);
nodesConnection = nodesURL.openConnection();
nodesConnection.connect();
in = new InputStreamReader((InputStream) nodesConnection.getContent());
if (in.ready()) return VALIDATED;
else return "Cannot validate the SFLOW target";
} catch (Exception e) {
return e.getMessage();
} finally {
// Close the connection
if (in != null) {
try {
in.close();
} catch (IOException e) {
handleException(
e,
logger,
"The following exception occured while attempting to close the connection");
}
}
}
}
} else {
logger.warn("Null target : Validation failed");
return "TARGET IS NULL";
}
return VALIDATED; // TODO: probably not the wanted behaviour
}
