Re: CIM events
by Krzysztof Kwaśniewski
Hello!
I have encountered several problems when trying to implement support for cim events in PyAgent, my gsoc project to which I'd like to still contribute. I'd like to ask you for help. I try to subscribe to a tog-pegasus instance to be informed about occurences of some specific events. In the end, what events exactly I'll be interested in is going to depend on the user and that is why the solution needs to be generic. I know I need to create instances of CIM_IndicationHandlerCIMXML and CIM_IndicationFilter, then an instance of CIM_IndicationSubscription. Apart from that I'll need to have an „listener” that will receive the notifications over http (basically it's going to be a small http server). I have a simple listener implementation, but for now I'd like to make a subscription.
To have more cim classes at hand I've installed all the openlmi-* packages. I've found - for instance - CIM_J2eeNotification, let's make an example on its base (it's the same with all the classes). Currently PyAgent subscribes in a following way:
1. Removes old handler, filter and subscription, if only they exist.
2. Creates a handler. From yawn:
Instance of CIM_IndicationHandlerCIMXML
Host: Null
Namespace: root/PG_InterOp
Type Name Value
string CreationClassName CIM_IndicationHandlerCIMXML
string Name PyAgentIndication
string SystemCreationClassName CIM_ComputerSystem
string SystemName fedora
string Caption Null
string Description Null
string Destination http://192.168.0.102
string ElementName Null
string InstanceID Null
string OtherPersistenceType Null
string OtherProtocol Null
string Owner Null
uint16 PersistenceType 2 (Permanent)
uint16 Protocol 2 (CIM-XML)
3. Creates a filter:
Instance of CIM_IndicationFilter
Host: Null
Namespace: root/PG_InterOp
Delete
Modify View Objects Associated with this Instance
(With Filters)
Type Name Value
string CreationClassName CIM_IndicationFilter
string Name PyAgentIndication
string SystemCreationClassName CIM_ComputerSystem
string SystemName fedora
string Caption Null
string Description Null
string ElementName Null
boolean IndividualSubscriptionSupported True
string InstanceID Null
string Query SELECT * FROM CIM_J2eeNotification
string QueryLanguage WQL
string SourceNamespace root/cimv2
string [ ] SourceNamespaces Null
4. I try to create a subscription in root/PG_InterOp that would refer to the existing handler and filter. When creating a subscription, an error occurs and no subscription instance is created. The returned message reads: „CIM_ERR_NOT_SUPPORTED: No providers are capable of servicing the subscription.” Well, it's more less self-explanatory why it fails. But why does it happen with all the CIM_Indication subclasses I can find in my tog-pegasus? This is the list of them:
CIM_Indication Instance Names Instances
|--- CIM_ClassIndication Instance Names Instances
| |--- CIM_ClassCreation Instance Names Instances
| |--- CIM_ClassDeletion Instance Names Instances
| |--- CIM_ClassModification Instance Names Instances
|--- CIM_InstIndication Instance Names Instances
| |--- CIM_InstCreation Instance Names Instances
| |--- CIM_InstDeletion Instance Names Instances
| |--- CIM_InstMethodCall Instance Names Instances
| |--- CIM_InstModification Instance Names Instances
| |--- CIM_InstRead Instance Names Instances
|--- CIM_ProcessIndication Instance Names Instances
| |--- CIM_AlertIndication Instance Names Instances
| | |--- CIM_AlertInstIndication Instance Names Instances
| | |--- CIM_ThresholdIndication Instance Names Instances
| |--- CIM_J2eeNotification Instance Names Instances
| |--- CIM_SNMPTrapIndication Instance Names Instances
| |--- Linux_MetricIndication Instance Names Instances
Why there are no providers? Where to get them from? Do you have any idea why it works like that?
Cheers
Krzysiek
11 years, 4 months
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