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# Copyright (C) 2012 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Convenient access to RRD databases."""
import re
import os
import time
import json
import bisect
import logging
from os.path import exists, join, splitext
_DB_FILENAME_RE = re.compile('(.*?)(-[0-9]+){0,1}\\.rrd$')
_INFO_RE = re.compile('([^[]+)\\[([^]]+)\\]\\.(.*)$')
_FETCH_PAGE = 256
_logger = logging.getLogger('rrd')
_rrdtool = None
class Rrd(object):
def __init__(self, root, step, rras=None):
global _rrdtool
import rrdtool
_rrdtool = rrdtool
self._root = root
self._step = step
# rrdtool knows nothing about `unicode`
self._rras = [i.encode('utf8') for i in rras or []]
self._dbsets = {}
if not exists(self._root):
os.makedirs(self._root)
for filename in os.listdir(self._root):
match = _DB_FILENAME_RE.match(filename)
if match is not None:
name, revision = match.groups()
self.get(name).load(filename, int(revision or 0))
def __iter__(self):
for i in self._dbsets.values():
yield i
def __getitem__(self, name):
return self.get(name)
def __contains__(self, name):
return name in self._dbsets
@property
def root(self):
return self._root
@property
def step(self):
return self._step
def get(self, name):
db = self._dbsets.get(name)
if db is None:
db = _DbSet(self._root, name, self._step, self._rras)
self._dbsets[name] = db
return db
class _DbSet(object):
def __init__(self, root, name, step, rras):
self._root = root
self.name = name
self._step = step
self._rras = rras
self._revisions = []
self._fields = None
self._field_names = None
self.__db = None
@property
def fields(self):
return self._field_names
@fields.setter
def fields(self, fields):
self._field_names = fields.keys()
self._field_names.sort()
self._fields = [str(fields[i]) for i in self._field_names]
_logger.debug('Set %r fields for %r', self._fields, self.name)
@property
def first(self):
if self._revisions:
return self._revisions[0].first
@property
def last(self):
if self._revisions:
return self._revisions[-1].last
def load(self, filename, revision):
_logger.debug('Load %s database from %s with revision %s',
filename, self._root, revision)
db = _Db(join(self._root, filename), revision)
bisect.insort(self._revisions, db)
return db
def put(self, values, timestamp=None):
if not self.fields:
_logger.debug('Parse fields from the first put')
self.fields = dict([
(i, 'DS:%s:GAUGE:%s:U:U' % (i, self._step * 2))
for i in values])
if not timestamp:
timestamp = int(time.time())
timestamp = timestamp / self._step * self._step
db = self._get_db(timestamp)
if db is None:
return
if timestamp <= db.last:
_logger.warning('Database %s updated at %s, %s in the past',
db.path, db.last, timestamp)
return
value = [str(timestamp)]
for name in self._field_names:
value.append(str(values[name]))
_logger.debug('Put %r to %s', value, db.path)
db.put(':'.join(value), timestamp)
def get(self, start=None, end=None, resolution=None):
if not self._revisions:
return
if not resolution:
resolution = self._step
if start is None:
start = self._revisions[0].first
if end is None:
end = self._revisions[-1].last
revisions = []
for db in reversed(self._revisions):
revisions.append(db)
if db.last <= start:
break
start = start - start % self._step - self._step
last = min(end, start + _FETCH_PAGE * resolution)
last -= last % self._step + self._step
for db in reversed(revisions):
db_end = min(last, db.last - self._step)
if start > db_end:
break
(row_start, start, row_step), __, rows = _rrdtool.fetch(
str(db.path),
'AVERAGE',
'--start', str(start),
'--end', str(db_end),
'--resolution', str(resolution))
for raw_row in rows:
row_start += row_step
if row_start > end:
break
row = {}
for i, value in enumerate(raw_row):
row[db.field_names[i]] = value or .0
yield row_start, row
start = db_end + 1
def _get_db(self, timestamp):
if self.__db is None and self._fields:
if self._revisions:
db = self._revisions[-1]
if db.last >= timestamp:
_logger.warning(
'Database %s updated at %s, %s in the past',
db.path, db.last, timestamp)
return None
if db.step != self._step or db.rras != self._rras or \
db.field_names != self._field_names:
db = self._create_db(db.revision + 1, db.last)
else:
db = self._create_db(0, timestamp)
self.__db = db
return self.__db
def _create_db(self, revision, timestamp):
filename = self.name
if revision:
filename += '-%s' % revision
filename += '.rrd'
_logger.debug('Create %s database in %s start=%s step=%s',
filename, self._root, timestamp, self._step)
_rrdtool.create(
str(join(self._root, filename)),
'--start', str(timestamp - self._step),
'--step', str(self._step),
*(self._fields + self._rras))
return self.load(filename, revision)
class _Db(object):
def __init__(self, path, revision=0):
self.path = str(path)
self._meta_path = splitext(path)[0] + '.meta'
self.revision = revision
self.fields = []
self.field_names = []
self.rras = []
info = _rrdtool.info(self.path)
self.step = info['step']
self.first = 0
self.last = info['last_update']
fields = {}
rras = {}
for key, value in info.items():
match = _INFO_RE.match(key)
if match is None:
continue
prefix, key, prop = match.groups()
if prefix == 'ds':
fields.setdefault(key, {})
fields[key][prop] = value
if prefix == 'rra':
rras.setdefault(key, {})
rras[key][prop] = value
for index in sorted([int(i) for i in rras.keys()]):
rra = rras[str(index)]
self.rras.append(
'RRA:%(cf)s:%(xff)s:%(pdp_per_row)s:%(rows)s' % rra)
for name in sorted(fields.keys()):
props = fields[name]
props['name'] = name
self.fields.append(props)
self.field_names.append(name)
if exists(self._meta_path):
with file(self._meta_path) as f:
self.first = json.load(f).get('first')
def put(self, value, timestamp):
if not self.first:
with file(self._meta_path, 'w') as f:
json.dump({'first': timestamp}, f)
self.first = timestamp
_rrdtool.update(self.path, str(value))
self.last = _rrdtool.info(self.path)['last_update']
def __cmp__(self, other):
return cmp(self.revision, other.revision)
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