4.6. Exceptions

The following exceptions are pywbem specific exceptions that can be raised at the WBEM client library API.

class pywbem.ConnectionError(message, conn_id=None)[source]

This exception indicates a problem with the connection to the WBEM server. A retry may or may not succeed.

Derived from Error.

Parameters
  • message (string) – Error message (will be put into args[0]).

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. Omitted or None if the error did not happen in context of any connection, or if the connection context was not known.

Variables

args – A tuple (message, ) set from the corresponding init arguments.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class pywbem.AuthError(message, conn_id=None)[source]

This exception indicates an authentication error with the WBEM server, either during TLS/SSL handshake, or during HTTP-level authentication.

Derived from Error.

Parameters
  • message (string) – Error message (will be put into args[0]).

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. Omitted or None if the error did not happen in context of any connection, or if the connection context was not known.

Variables

args – A tuple (message, ) set from the corresponding init arguments.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class pywbem.HTTPError(status, reason, cimerror=None, cimdetails=None, conn_id=None, request_data=None, response_data=None)[source]

This exception indicates that the WBEM server returned an HTTP response with a bad HTTP status code.

Derived from Error.

The args instance variable is a tuple (status, reason, cimerror, cimdetails).

The message instance variable is not set.

Occurrence of this exception nearly always indicates an issue with the WBEM server.

Parameters
  • status (integer) – HTTP status code (e.g. 500).

  • reason (string) – HTTP reason phrase (e.g. “Internal Server Error”).

  • cimerror (string) – Value of the CIMError HTTP header field, if present. None, otherwise.

  • cimdetails (dict) –

    Dictionary with CIMOM-specific header fields with details about the situation reported in the CIMError header field.

    • Key: header field name (e.g. PGErrorDetail)

    • Value: header field value (i.e. text message)

    Passing None will result in an empty dictionary.

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. None if the error did not happen in context of any connection, or if the connection context was not known.

  • request_data (string) – CIM-XML request string. None means the exception does not store a CIM-XML request.

  • response_data (string) – CIM-XML response string. None means the exception does not store a CIM-XML response.

Variables

args – A tuple (status, reason, cimerror, cimdetails) set from the corresponding init arguments.

Attributes:

cimdetails

CIMOM-specific details on the situation reported in the CIMError header field.

cimerror

Value of CIMError HTTP header field in response, if present.

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

reason

HTTP reason phrase.

request_data

CIM-XML request string (settable).

response_data

CIM-XML response string (settable).

status

HTTP status code.

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

property cimdetails

CIMOM-specific details on the situation reported in the CIMError header field.

The value is a dictionary with:

  • Key: header field name (e.g. PGErrorDetail).

  • Value: header field value.

Type

dict

property cimerror

Value of CIMError HTTP header field in response, if present.

None, otherwise.

See DSP0200 for a list of values.

Type

string

property reason

HTTP reason phrase.

Example: “Internal Server Error”

See RFC2616 for a list of HTTP status codes and reason phrases.

Type

string

property status

HTTP status code.

Example: 500

See RFC2616 for a list of HTTP status codes and reason phrases.

Type

integer

class pywbem.TimeoutError(message, conn_id=None)[source]

This exception indicates that the client timed out waiting for the WBEM server.

Derived from Error.

Parameters
  • message (string) – Error message (will be put into args[0]).

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. Omitted or None if the error did not happen in context of any connection, or if the connection context was not known.

Variables

args – A tuple (message, ) set from the corresponding init arguments.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class pywbem.ParseError(message, conn_id=None, request_data=None, response_data=None)[source]

This exception is a base class for exceptions that indicate a parsing error with the CIM-XML operation response the pywbem client received, or with the CIM-XML indication request the pywbem listener received.

Derived from Error.

The CIM-XML response data is part of the str() representation of the exception.

This exception is a base class for more specific exceptions:

  • CIMXMLParseError - Issue at the CIM-XML level (e.g. NAME attribute missing on CLASS element)

  • XMLParseError - Issue at the XML level (e.g. ill-formed XML)

  • HeaderParseError - Issue with HTTP headers (e.g. invalid content-type header)

Occurrence of this exception nearly always indicates an issue with the WBEM server.

Parameters
  • message (string) – Error message (will be put into args[0]).

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. None if the error did not happen in context of any connection, or if the connection context was not known.

  • request_data (string) – CIM-XML request string. None means the exception does not store a CIM-XML request.

  • response_data (string) – CIM-XML response string. None means the exception does not store a CIM-XML response.

Variables

args – A tuple (message, ) set from the corresponding init argument.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

request_data

CIM-XML request string (settable).

response_data

CIM-XML response string (settable).

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class pywbem.CIMXMLParseError(message, conn_id=None, request_data=None, response_data=None)[source]

This exception indicates a specific kind of ParseError that is an issue at the CIM-XML level.

Example: ‘NAME’ attribute missing on ‘CLASS’ element.

Occurrence of this exception nearly always indicates an issue with the WBEM server.

Parameters
  • message (string) – Error message (will be put into args[0]).

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. None if the error did not happen in context of any connection, or if the connection context was not known.

  • request_data (string) – CIM-XML request string. None means the exception does not store a CIM-XML request.

  • response_data (string) – CIM-XML response string. None means the exception does not store a CIM-XML response.

Variables

args – A tuple (message, ) set from the corresponding init argument.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

request_data

CIM-XML request string (settable).

response_data

CIM-XML response string (settable).

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class pywbem.XMLParseError(message, conn_id=None, request_data=None, response_data=None)[source]

This exception indicates a specific kind of ParseError that is an issue at the XML level.

Example: Ill-formed XML.

Occurrence of this exception nearly always indicates an issue with the WBEM server.

Parameters
  • message (string) – Error message (will be put into args[0]).

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. None if the error did not happen in context of any connection, or if the connection context was not known.

  • request_data (string) – CIM-XML request string. None means the exception does not store a CIM-XML request.

  • response_data (string) – CIM-XML response string. None means the exception does not store a CIM-XML response.

Variables

args – A tuple (message, ) set from the corresponding init argument.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

request_data

CIM-XML request string (settable).

response_data

CIM-XML response string (settable).

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class pywbem.HeaderParseError(message, conn_id=None, request_data=None, response_data=None)[source]

This exception indicates a specific kind of ParseError that is an issue with an HTTP header.

Example: Invalid content-type.

Occurrence of this exception nearly always indicates an issue with the WBEM server.

Parameters
  • message (string) – Error message (will be put into args[0]).

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. None if the error did not happen in context of any connection, or if the connection context was not known.

  • request_data (string) – CIM-XML request string. None means the exception does not store a CIM-XML request.

  • response_data (string) – CIM-XML response string. None means the exception does not store a CIM-XML response.

Variables

args – A tuple (message, ) set from the corresponding init argument.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

request_data

CIM-XML request string (settable).

response_data

CIM-XML response string (settable).

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class pywbem.CIMError(status_code, status_description=None, instances=None, conn_id=None, request_data=None)[source]

This exception indicates that the WBEM server returned an error response with a CIM status code.

Derived from Error.

Accessing the CIM status code of a CIMError object:

In Python 2, any Exception object can be accessed by index and slice and will delegate such access to its args instance variable. In Python 3, that ability has been removed.

In pywbem 0.9, the status_code and status_description properties were added.

Therefore, the following approach is not recommended, because it does not work on Python 3:

except CIMError as exc:
    status_code = exc[0]

The following approach works for pywbem 0.7 or newer:

except CIMError as exc:
    status_code = exc.args[0]

The following approach is recommended when using pywbem 0.9 or newer:

except CIMError as exc:
    status_code = exc.status_code
Parameters
  • status_code (integer) – Numeric CIM status code.

  • status_description (string) – CIM status description text returned by the server, representing a human readable message describing the error. None, if the server did not return a description text.

  • instances (list of CIMInstance) – List of CIM instances returned by the WBEM server in the error response, that provide more details on the error. None if there are no such instances.

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. None if the error did not happen in context of any connection, or if the connection context was not known.

  • request_data (string) – CIM-XML request string. None means the exception does not store a CIM-XML request.

Variables

args – A tuple (status_code, status_description, instances) set from the corresponding init arguments.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

instances

CIM instances returned by the WBEM server in the error response, that provide more details on the error.

request_data

CIM-XML request string (settable).

status_code

Numeric CIM status code.

status_code_name

Symbolic name of the CIM status code.

status_description

CIM status description text returned by the server, representing a human readable message describing the error.

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

property instances

CIM instances returned by the WBEM server in the error response, that provide more details on the error.

New in pywbem 0.13.

None if there are no such instances.

Type

List of CIMInstance

property status_code

Numeric CIM status code.

New in pywbem 0.9.

Example: 5

See CIM status codes for constants defining the numeric CIM status code values.

Type

integer

property status_code_name

Symbolic name of the CIM status code.

Example: “CIM_ERR_INVALID_CLASS”

New in pywbem 0.9.

If the CIM status code is invalid, the string “Invalid status code <status_code>” is returned.

Type

string

property status_description

CIM status description text returned by the server, representing a human readable message describing the error.

New in pywbem 0.9.

Example: “The specified class does not exist.”

If the server did not return a description, a short default text for the CIM status code is returned. If the CIM status code is invalid, the string “Invalid status code <status_code>” is returned.

Type

string

class pywbem.ModelError(message, conn_id=None)[source]

This exception indicates an error with the model implemented by the WBEM server, that was detected by the pywbem client.

Derived from Error.

Examples are mismatches in data types of CIM elements (properties, methods, parameters) between classes and instances, CIM elements that appear in instances without being declared in classes, or violations of requirements defined in advertised management profiles.

Parameters
  • message (string) – Error message (will be put into args[0]).

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. Omitted or None if the error did not happen in context of any connection, or if the connection context was not known.

Variables

args – A tuple (message, ) set from the corresponding init argument.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class pywbem.Error(*args, **kwargs)[source]

Abstract base class for pywbem client specific exceptions.

Parameters
  • *args – Any other positional arguments are passed to Exception.

  • conn_id (connection id) – Connection ID of the connection in whose context the error happened. Omitted or None if the error did not happen in context of any connection, or if the connection context was not known. Must be specified as a keyword argument.

Attributes:

conn_id

Connection ID of the connection in whose context the error happened.

conn_str

String that identifies the connection in exception messages.

Methods:

with_traceback

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

property conn_id

Connection ID of the connection in whose context the error happened.

None if the error did not happen in context of any connection, or if the connection context was not known.

Type

connection id

property conn_str

String that identifies the connection in exception messages.

Type

unicode string