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from collections import deque
from aiomeasures.events import Event
class Collector(deque):
"""Caped list of metrics
"""
def flush(self, rate=None, formatter=None):
while True:
try:
metric = self.popleft()
if isinstance(metric, Event):
yield formatter(metric)
continue
if metric.value is None:
continue
if rate and metric.rate and rate < metric.rate:
continue
if formatter:
try:
yield formatter(metric)
except ValueError:
continue
else:
yield metric
except IndexError:
return
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