def _build_equation_stat_inputs(eq_stat_names):
input_stats = []
for stat_name in eq_stat_names:
stat_name, fields = _parse_fields(stat_name)
input_stats.append(DerivedStatInput(stat_name, fields))
return input_stats
def _parse_composite_stats(composite_stats_cfg):
# Example of what is expected for each stat_cfg:
# sum(node.ifs.ops.in[:field1:field2])
composite_stats = []
for stat_cfg in composite_stats_cfg.split():
bracket1 = stat_cfg.find("(")
bracket2 = stat_cfg.find(")")
if bracket1 <= 0 or bracket2 == -1 or bracket1 > bracket2:
raise RuntimeError("Failed to parse operation from %s."
"Expected: op(stat) where op is avg, min, max, "
" or sum and stat is the name of a base OneFS "
' statistic name that starts with "node.".' %
stat_cfg)
op_name = stat_cfg[0:bracket1]
if op_name not in COMPOSITE_OPERATIONS:
raise RuntimeError("Invalid operation %s specified for %s." %
(op_name, stat_cfg))
in_stat_name = stat_cfg[bracket1 + 1:bracket2]
if in_stat_name.startswith("node.") is False:
raise RuntimeError("Invalid stat name %s specified for %s."
' Composite stats must start with "node.".' %
(op_name, stat_cfg))
out_stat_name = "cluster.%s.%s" % (in_stat_name.replace(":",
"."), op_name)
in_stat_name, fields = _parse_fields(in_stat_name)
# TODO should validate that this is a valid stat name
composite_stat = ClusterCompositeStatComputer(
DerivedStatInput(in_stat_name, fields),
out_stat_name,
COMPOSITE_OPERATIONS[op_name],
)
composite_stats.append(composite_stat)
return composite_stats
def _parse_pct_change_stats(pct_change_stats_cfg):
# Expected is just a white-space delimitted list of stat names
pct_change_stats = []
for stat_name in pct_change_stats_cfg.split():
out_stat_name = stat_name.replace(":", ".") + ".percentchange"
stat_name, fields = _parse_fields(stat_name)
pct_change_stats.append(
PercentChangeStatComputer(DerivedStatInput(stat_name, fields),
out_stat_name))
return pct_change_stats