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Faults for NM-WG Services. Dan Gunter, LBNL GGF12, Brussels September 2004. Outline. Why we are talking about this What’s out there Suggestions for what we can do Administrativia. Background. NM-WG has been working on some Web Services for requesting and reporting network monitoring data

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Faults for nm wg services l.jpg

Faults for NM-WG Services

Dan Gunter, LBNL

GGF12, Brussels

September 2004


Outline l.jpg
Outline

  • Why we are talking about this

  • What’s out there

  • Suggestions for what we can do

  • Administrativia

GGF12, Brussels, Belgium


Background l.jpg
Background

  • NM-WG has been working on some Web Services for requesting and reporting network monitoring data

    • “Request” schema

    • “Response” schema

  • This session is the first joint discussion of how to report failures

GGF12, Brussels, Belgium


Faults and web services l.jpg
Faults and Web Services

  • WSDL has a standard way to indicate faults, I.e. schemas for fault elements

  • SOAP (used to invoke the service) can distinguish between a “normal” service return value and a “fault”

  • Therefore the important task is to define a structure for the fault elements

GGF12, Brussels, Belgium


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WS-RF Standards

  • OASIS TC on WS-RF has a document (by Steve Tuecke et. al.) on a general-purpose structure for faults:

    • wsrf-WS-BaseFaults-1.2-draft-02.pdf

  • We should use this!

GGF12, Brussels, Belgium


Ws rf base fault l.jpg
WS-RF Base Fault

<BaseFault>

<Timestamp>xsd:dateTime</Timestamp>

<OriginatorReference>

wsa:EndpointReferenceType

</OriginatorReference> ?

<ErrorCode dialect="anyURI">xsd:string</ErrorCode> ?

<Description>xsd:string</Description> *

<FaultCause>wsbf:BaseFault</FaultCause> *

</BaseFault>

e.g. POSIX

GGF12, Brussels, Belgium


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Extending BaseFault

  • The specification requires that all services extend BaseFault in their WSDL

  • Same idea as extending a base Exception class to add user-defined Exception types

  • E.g.:

    <xsd:complexType name=“MyFaultType">

    <xsd:complexContent>

    <xsd:extension base="wsbf:BaseFaultType"/>

    </xsd:complexContent>

    </xsd:complexType>

GGF12, Brussels, Belgium


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BaseFault is just a framework

  • NM-WG still needs to agree on a list or taxonomy of fault types, along with whatever additional data they contain

  • Next slide(s) contain some suggestions to start discussion

GGF12, Brussels, Belgium


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NM-WG Base Fault

  • Pick a namespace like http://ggf.org/NM-WG/2004/09/faults/

  • Call it, e.g., “NMWGBaseFault”

GGF12, Brussels, Belgium


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Dialects

  • Indicate how to interpret the <ErrorCode> element

  • Meant to encapsulate legacy error codes

  • Two seem of immediate use:

    • When querying a DB; SQL errors

      • URI = http://ggf.org/NM-WG/2004/09/faults/SQL/

      • Use “SQLSTATE” codes? http://www.pitt.edu/AFShome/h/o/hoffman/public/html/oradoc/server.804/a58231/appd.htm

    • When running a network test; program errors

      • URI = http://ggf.org/NM-WG/2004/09/faults/POSIX/

      • URI = http://ggf.org/NM-WG/2004/09/faults/{program}/

GGF12, Brussels, Belgium


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Some DAIS-WG faults

  • MessageNotValid

    • The message is not supported at all or it is not supported at this time

  • ResourceNotAvailable

    • The data resource that is the target of the message is not available. This could be that the data resource has been identified incorrectly or that is has stopped operating.

  • ConcurrentOperationsNotSupported

    • The service is already processing a message and concurrent operations are not supported

GGF12, Brussels, Belgium


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Adminstrative Issues

  • Separate document for faults?

    • Pro: Can be worked on in parallel

    • Con: Needs to be kept in sync with requirements and specs

  • Who will take the time to write this up?

    • Don’t all raise your hands at once!

GGF12, Brussels, Belgium


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