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# Copyright (C) 2012-2014 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 bisect
import logging
from os.path import exists, join, splitext, basename
import rrdtool
from . import Bin
_DB_FILENAME_RE = re.compile('(.*?)(-[0-9]+){0,1}\\.rrd$')
_INFO_RE = re.compile('([^[]+)\\[([^]]+)\\]\\.(.*)$')
_FETCH_PAGE = 256
_logger = logging.getLogger('rrd')
class Rrd(object):
def __init__(self, root, name, fields, step, rras):
self._root = root
self.name = name
self.step = step
self._fields = fields or {}
# rrdtool knows nothing about `unicode`
self._rras = [i.encode('utf8') for i in rras or []]
self._revisions = []
self._db = None
_logger.debug('[%s] open rrd at %r', self.name, root)
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 None:
continue
name_, revision = match.groups()
if name_ == name:
self._load(filename, int(revision or 0))
@property
def files(self):
for rev in self._revisions:
yield rev.path
@property
def first(self):
return self._revisions[0].first if self._revisions else None
@property
def last(self):
return self._revisions[-1].last if self._revisions else None
def values(self, timestamp=None):
return self._revisions[-1].values(timestamp) if self._revisions else {}
def put(self, values, timestamp=None):
if not timestamp:
timestamp = int(time.time())
timestamp = timestamp / self.step * self.step
_logger.trace('[%s] put %r', self.name, values)
self._get_db(timestamp, values).put(values, 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
for ts, row in db.get(start, db_end, resolution):
if ts > end:
break
yield ts, row
start = db_end + 1
def _get_db(self, timestamp, values):
if self._db is not None:
return self._db
fields = []
for field in sorted(values.keys()):
ds = self._fields.get(field) or {}
ds_type = ds.get('type') or 'GAUGE'
ds_heartbeat = ds.get('heartbeat') or self.step * 2
fields.append('DS:%s:%s:%s:U:U' % (field, ds_type, ds_heartbeat))
_logger.debug('[%s] fields from jut values: %r', self.name, fields)
if not self._revisions:
self._db = self._create_db(0, fields, timestamp)
else:
db = self._revisions[-1]
if db.fields == fields and db.rras == self._rras:
self._db = db
else:
self._db = self._create_db(db.revision + 1, fields, db.last)
return self._db
def _create_db(self, revision, fields, timestamp):
filename = self.name
if revision:
filename += '-%s' % revision
filename += '.rrd'
_logger.debug('[%s] create database filename=%s start=%s step=%s',
self.name, filename, timestamp, self.step)
rrdtool.create(
str(join(self._root, filename)),
'--start', str(timestamp - self.step),
'--step', str(self.step),
*(fields + self._rras))
return self._load(filename, revision)
def _load(self, filename, revision):
_logger.debug('[%s] load database filename=%s revision=%s',
self.name, filename, revision)
db = _Db(join(self._root, filename), revision)
bisect.insort(self._revisions, db)
return db
class _Db(object):
def __init__(self, path, revision=0):
self.path = str(path)
basepath = splitext(path)[0]
self.name = basename(basepath)
self._meta = Bin(basepath + '.meta', {})
self.revision = revision
self.fields = []
self.field_names = []
self.rras = []
info = rrdtool.info(self.path)
self.step = info['step']
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()):
ds = fields[name]
self.fields.append('DS:%s:%s:%s:U:U' %
(name, ds['type'], ds['minimal_heartbeat']))
self.field_names.append(name)
@property
def first(self):
return self._meta['first'] or 0
def values(self, timestamp):
if timestamp and timestamp - self.last <= self.step and \
'pending' in self._meta:
return self._meta['pending']
info = rrdtool.info(self.path)
result = {}
for field in self.field_names:
result[field] = float(info.get('ds[%s].last_ds' % field) or 0)
return result
def put(self, values, timestamp):
if timestamp - self.last < self.step:
self._meta['pending'] = values
self._meta.commit()
return
if 'pending' in self._meta:
pending = self._meta.pop('pending')
if timestamp - self.last >= self.step * 2:
self.put(pending, self.last + self.step)
self._meta.commit()
if not self.first:
self._meta['first'] = timestamp
self._meta.commit()
value = [str(timestamp)]
for name in self.field_names:
value.append(str(values[name]))
rrdtool.update(self.path, str(':'.join(value)))
self.last = timestamp
def get(self, start, end, resolution):
(row_start, start, row_step), __, rows = rrdtool.fetch(
str(self.path),
'AVERAGE',
'--start', str(start),
'--end', str(end),
'--resolution', str(resolution))
for raw_row in rows:
row_start += row_step
row = {}
for i, value in enumerate(raw_row):
row[self.field_names[i]] = value or .0
yield row_start, row
def __cmp__(self, other):
return cmp(self.revision, other.revision)
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