The ceilometer.transformer.arithmetic Module¶

class ceilometer.transformer.arithmetic.ArithmeticTransformer(target=None, **kwargs)[source]¶

Bases: ceilometer.transformer.TransformerBase

Multi meter arithmetic transformer.

Transformer that performs arithmetic operations over one or more meters and/or their metadata.

flush()[source]¶

grouping_keys = ['resource_id']¶

handle_sample(_sample)[source]¶

meter_name_re = <_sre.SRE_Pattern object>¶

classmethod parse_expr(expr)[source]¶

Transforms meter names in the expression into valid identifiers.

Parameters:	expr – unescaped expression
Returns:	A tuple of the escaped expression and a dict representing the translation of meter names into Python identifiers