def fetch(self, startTime, endTime):
try:
data = whisper.fetch(self.fs_path, startTime, endTime)
except IOError:
log.exception("Failed fetch of whisper file '%s'" % self.fs_path)
return None
if not data:
return None
time_info, values = data
(start, end, step) = time_info
meta_info = whisper.info(self.fs_path)
aggregation_method = meta_info['aggregationMethod']
lowest_step = min(
[i['secondsPerPoint'] for i in meta_info['archives']])
# Merge in data from carbon's cache
cached_datapoints = []
try:
cached_datapoints = CarbonLink().query(self.real_metric_path)
except:
log.exception("Failed CarbonLink query '%s'" %
self.real_metric_path)
cached_datapoints = []
if isinstance(cached_datapoints, dict):
cached_datapoints = cached_datapoints.items()
values = merge_with_cache(cached_datapoints, start, step, values,
aggregation_method)
return time_info, values
def merge_with_carbonlink(metric, start, step, values, aggregation_method=None, raw_step=None):
"""Get points from carbonlink and merge them with existing values."""
cached_datapoints = []
try:
cached_datapoints = CarbonLink().query(metric)
except BaseException:
log.exception("Failed CarbonLink query '%s'" % metric)
cached_datapoints = []
if isinstance(cached_datapoints, dict):
cached_datapoints = list(cached_datapoints.items())
return merge_with_cache(
cached_datapoints, start, step, values,
func=aggregation_method, raw_step=raw_step)
def fetch(self, startTime, endTime):
data = self.ceres_node.read(startTime, endTime)
time_info = (data.startTime, data.endTime, data.timeStep)
values = list(data.values)
# Merge in data from carbon's cache
try:
cached_datapoints = CarbonLink().query(self.real_metric_path)
except:
log.exception("Failed CarbonLink query '%s'" %
self.real_metric_path)
cached_datapoints = []
values = merge_with_cache(cached_datapoints, data.startTime,
data.timeStep, values)
return time_info, values
def CarbonLink():
"""Return a carbonlink instance."""
# Late import to avoid pulling out too many dependencies with
# readers.py which is usually imported by plugins.
from graphite.carbonlink import CarbonLink
return CarbonLink()
