The ceilometer.transformer.arithmetic Module

class ceilometer.transformer.arithmetic.ArithmeticTransformer(target=None, **kwargs)

Bases: ceilometer.transformer.TransformerBase

Multi meter arithmetic transformer.

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

flush(context)

handle_sample(context, _sample)

classmethod parse_expr(expr)

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