/usr/lib/python2.7/dist-packages/gnocchi/storage/file.py is in python-gnocchi 3.0.4-3.
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#
# Copyright © 2014 Objectif Libre
# Copyright © 2015 Red Hat
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import contextlib
import datetime
import errno
import os
import shutil
import tempfile
import uuid
from oslo_config import cfg
import six
from gnocchi import storage
from gnocchi.storage import _carbonara
OPTS = [
cfg.StrOpt('file_basepath',
default='/var/lib/gnocchi',
help='Path used to store gnocchi data files.'),
cfg.StrOpt('file_basepath_tmp',
default='${file_basepath}/tmp',
help='Path used to store Gnocchi temporary files.'),
]
class FileStorage(_carbonara.CarbonaraBasedStorage):
WRITE_FULL = True
def __init__(self, conf):
super(FileStorage, self).__init__(conf)
self.basepath = conf.file_basepath
self.basepath_tmp = conf.file_basepath_tmp
try:
os.mkdir(self.basepath)
except OSError as e:
if e.errno != errno.EEXIST:
raise
self.measure_path = os.path.join(self.basepath, self.MEASURE_PREFIX)
try:
os.mkdir(self.measure_path)
except OSError as e:
if e.errno != errno.EEXIST:
raise
try:
os.mkdir(self.basepath_tmp)
except OSError as e:
if e.errno != errno.EEXIST:
raise
def _get_tempfile(self):
return tempfile.NamedTemporaryFile(prefix='gnocchi',
dir=self.basepath_tmp,
delete=False)
def _atomic_file_store(self, dest, data):
tmpfile = self._get_tempfile()
tmpfile.write(data)
tmpfile.close()
os.rename(tmpfile.name, dest)
def _build_metric_dir(self, metric):
return os.path.join(self.basepath, str(metric.id))
def _build_unaggregated_timeserie_path(self, metric, version=3):
return os.path.join(
self._build_metric_dir(metric),
'none' + ("_v%s" % version if version else ""))
def _build_metric_path(self, metric, aggregation):
return os.path.join(self._build_metric_dir(metric),
"agg_" + aggregation)
def _build_metric_path_for_split(self, metric, aggregation,
timestamp_key, granularity, version=3):
path = os.path.join(self._build_metric_path(metric, aggregation),
timestamp_key + "_" + str(granularity))
return path + '_v%s' % version if version else path
def _build_measure_path(self, metric_id, random_id=None):
path = os.path.join(self.measure_path, six.text_type(metric_id))
if random_id:
if random_id is True:
now = datetime.datetime.utcnow().strftime("_%Y%m%d_%H:%M:%S")
random_id = six.text_type(uuid.uuid4()) + now
return os.path.join(path, random_id)
return path
def _create_metric(self, metric):
path = self._build_metric_dir(metric)
try:
os.mkdir(path, 0o750)
except OSError as e:
if e.errno == errno.EEXIST:
raise storage.MetricAlreadyExists(metric)
raise
for agg in metric.archive_policy.aggregation_methods:
try:
os.mkdir(self._build_metric_path(metric, agg), 0o750)
except OSError as e:
if e.errno != errno.EEXIST:
raise
def _store_new_measures(self, metric, data):
tmpfile = self._get_tempfile()
tmpfile.write(data)
tmpfile.close()
path = self._build_measure_path(metric.id, True)
while True:
try:
os.rename(tmpfile.name, path)
break
except OSError as e:
if e.errno != errno.ENOENT:
raise
try:
os.mkdir(self._build_measure_path(metric.id))
except OSError as e:
# NOTE(jd) It's possible that another process created the
# path just before us! In this case, good for us, let's do
# nothing then! (see bug #1475684)
if e.errno != errno.EEXIST:
raise
def _build_report(self, details):
metric_details = {}
for metric in os.listdir(self.measure_path):
metric_details[metric] = (
self._pending_measures_to_process_count(metric))
return (len(metric_details.keys()), sum(metric_details.values()),
metric_details if details else None)
def list_metric_with_measures_to_process(self, size, part, full=False):
if full:
return set(os.listdir(self.measure_path))
return set(
os.listdir(self.measure_path)[size * part:size * (part + 1)])
def _list_measures_container_for_metric_id(self, metric_id):
try:
return os.listdir(self._build_measure_path(metric_id))
except OSError as e:
# Some other process treated this one, then do nothing
if e.errno == errno.ENOENT:
return []
raise
def _delete_measures_files_for_metric_id(self, metric_id, files):
for f in files:
try:
os.unlink(self._build_measure_path(metric_id, f))
except OSError as e:
# Another process deleted it in the meantime, no prob'
if e.errno != errno.ENOENT:
raise
try:
os.rmdir(self._build_measure_path(metric_id))
except OSError as e:
# ENOENT: ok, it has been removed at almost the same time
# by another process
# ENOTEMPTY: ok, someone pushed measure in the meantime,
# we'll delete the measures and directory later
# EEXIST: some systems use this instead of ENOTEMPTY
if e.errno not in (errno.ENOENT, errno.ENOTEMPTY, errno.EEXIST):
raise
def _delete_unprocessed_measures_for_metric_id(self, metric_id):
files = self._list_measures_container_for_metric_id(metric_id)
self._delete_measures_files_for_metric_id(metric_id, files)
def _pending_measures_to_process_count(self, metric_id):
return len(self._list_measures_container_for_metric_id(metric_id))
@contextlib.contextmanager
def _process_measure_for_metric(self, metric):
files = self._list_measures_container_for_metric_id(metric.id)
measures = []
for f in files:
abspath = self._build_measure_path(metric.id, f)
with open(abspath, "rb") as e:
measures.extend(self._unserialize_measures(f, e.read()))
yield measures
self._delete_measures_files_for_metric_id(metric.id, files)
def _store_unaggregated_timeserie(self, metric, data, version=3):
self._atomic_file_store(
self._build_unaggregated_timeserie_path(metric, version),
data)
def _get_unaggregated_timeserie(self, metric, version=3):
path = self._build_unaggregated_timeserie_path(metric, version)
try:
with open(path, 'rb') as f:
return f.read()
except IOError as e:
if e.errno == errno.ENOENT:
raise storage.MetricDoesNotExist(metric)
raise
def _delete_unaggregated_timeserie(self, metric, version=3):
path = self._build_unaggregated_timeserie_path(metric, version)
try:
os.unlink(path)
except IOError as e:
if e.errno == errno.ENOENT:
raise storage.MetricDoesNotExist(metric)
raise
def _list_split_keys_for_metric(self, metric, aggregation, granularity,
version=None):
try:
files = os.listdir(self._build_metric_path(metric, aggregation))
except OSError as e:
if e.errno == errno.ENOENT:
raise storage.MetricDoesNotExist(metric)
raise
keys = set()
for f in files:
meta = f.split("_")
if meta[1] == str(granularity) and self._version_check(f, version):
keys.add(meta[0])
return keys
def _delete_metric_measures(self, metric, timestamp_key, aggregation,
granularity, version=3):
os.unlink(self._build_metric_path_for_split(
metric, aggregation, timestamp_key, granularity, version))
def _store_metric_measures(self, metric, timestamp_key, aggregation,
granularity, data, offset=None, version=3):
self._atomic_file_store(
self._build_metric_path_for_split(metric, aggregation,
timestamp_key, granularity,
version),
data)
def _delete_metric(self, metric):
path = self._build_metric_dir(metric)
try:
shutil.rmtree(path)
except OSError as e:
if e.errno != errno.ENOENT:
# NOTE(jd) Maybe the metric has never been created (no
# measures)
raise
def _get_measures(self, metric, timestamp_key, aggregation, granularity,
version=3):
path = self._build_metric_path_for_split(
metric, aggregation, timestamp_key, granularity, version)
try:
with open(path, 'rb') as aggregation_file:
return aggregation_file.read()
except IOError as e:
if e.errno == errno.ENOENT:
if os.path.exists(self._build_metric_dir(metric)):
raise storage.AggregationDoesNotExist(metric, aggregation)
raise storage.MetricDoesNotExist(metric)
raise
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