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counter.py
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/
counter.py
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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# vim: set et sw=4 ts=4 sts=4 ff=unix fenc=utf8:
# Author: Binux<i@binux.me>
# http://binux.me
# Created on 2012-11-14 17:09:50
from __future__ import unicode_literals, division, absolute_import
import time
import logging
from collections import deque
try:
from UserDict import DictMixin
except ImportError:
from collections import Mapping as DictMixin
import six
from six import iteritems
from six.moves import cPickle
class BaseCounter(object):
def __init__(self):
pass
def event(self, value=1):
"""Fire a event."""
raise NotImplementedError
def value(self, value):
"""Set counter value."""
raise NotImplementedError
@property
def avg(self):
"""Get average value"""
raise NotImplementedError
@property
def sum(self):
"""Get sum of counter"""
raise NotImplementedError
def empty(self):
"""Clear counter"""
raise NotImplementedError
class TotalCounter(BaseCounter):
"""Total counter"""
def __init__(self):
super(TotalCounter, self).__init__()
self.cnt = 0
def event(self, value=1):
self.cnt += value
def value(self, value):
self.cnt = value
@property
def avg(self):
return self.cnt
@property
def sum(self):
return self.cnt
def empty(self):
return self.cnt == 0
class AverageWindowCounter(BaseCounter):
"""
Record last N(window) value
"""
def __init__(self, window_size=300):
super(AverageWindowCounter, self).__init__()
self.window_size = window_size
self.values = deque(maxlen=window_size)
def event(self, value=1):
self.values.append(value)
value = event
@property
def avg(self):
return self.sum / len(self.values)
@property
def sum(self):
return sum(self.values)
def empty(self):
if not self.values:
return True
class TimebaseAverageEventCounter(BaseCounter):
"""
Record last window_size * window_interval seconds event.
records will trim ever window_interval seconds
"""
def __init__(self, window_size=30, window_interval=10):
super(TimebaseAverageEventCounter, self).__init__()
self.max_window_size = window_size
self.window_size = 0
self.window_interval = window_interval
self.values = deque(maxlen=window_size)
self.events = deque(maxlen=window_size)
self.times = deque(maxlen=window_size)
self.cache_value = 0
self.cache_event = 0
self.cache_start = None
self._first_data_time = None
def event(self, value=1):
now = time.time()
if self._first_data_time is None:
self._first_data_time = now
if self.cache_start is None:
self.cache_value = value
self.cache_event = 1
self.cache_start = now
elif now - self.cache_start > self.window_interval:
self.values.append(self.cache_value)
self.events.append(self.cache_event)
self.times.append(self.cache_start)
self.on_append(self.cache_value, self.cache_start)
self.cache_value = value
self.cache_event = 1
self.cache_start = now
else:
self.cache_value += value
self.cache_event += 1
return self
def value(self, value):
self.cache_value = value
def _trim_window(self):
now = time.time()
if self.cache_start and now - self.cache_start > self.window_interval:
self.values.append(self.cache_value)
self.events.append(self.cache_event)
self.times.append(self.cache_start)
self.on_append(self.cache_value, self.cache_start)
self.cache_value = 0
self.cache_start = None
if self.window_size != self.max_window_size and self._first_data_time is not None:
time_passed = now - self._first_data_time
self.window_size = min(self.max_window_size, time_passed / self.window_interval)
window_limit = now - self.window_size * self.window_interval
while self.times and self.times[0] < window_limit:
self.times.popleft()
self.events.popleft()
self.values.popleft()
@property
def avg(self):
events = (sum(self.events) + self.cache_event)
if not events:
return 0
return float(self.sum) / events
@property
def sum(self):
self._trim_window()
return sum(self.values) + self.cache_value
def empty(self):
self._trim_window()
if not self.values and not self.cache_start:
return True
def on_append(self, value, time):
pass
class TimebaseAverageWindowCounter(BaseCounter):
"""
Record last window_size * window_interval seconds values.
records will trim ever window_interval seconds
"""
def __init__(self, window_size=30, window_interval=10):
super(TimebaseAverageWindowCounter, self).__init__()
self.max_window_size = window_size
self.window_size = 0
self.window_interval = window_interval
self.values = deque(maxlen=window_size)
self.times = deque(maxlen=window_size)
self.cache_value = 0
self.cache_start = None
self._first_data_time = None
def event(self, value=1):
now = time.time()
if self._first_data_time is None:
self._first_data_time = now
if self.cache_start is None:
self.cache_value = value
self.cache_start = now
elif now - self.cache_start > self.window_interval:
self.values.append(self.cache_value)
self.times.append(self.cache_start)
self.on_append(self.cache_value, self.cache_start)
self.cache_value = value
self.cache_start = now
else:
self.cache_value += value
return self
def value(self, value):
self.cache_value = value
def _trim_window(self):
now = time.time()
if self.cache_start and now - self.cache_start > self.window_interval:
self.values.append(self.cache_value)
self.times.append(self.cache_start)
self.on_append(self.cache_value, self.cache_start)
self.cache_value = 0
self.cache_start = None
if self.window_size != self.max_window_size and self._first_data_time is not None:
time_passed = now - self._first_data_time
self.window_size = min(self.max_window_size, time_passed / self.window_interval)
window_limit = now - self.window_size * self.window_interval
while self.times and self.times[0] < window_limit:
self.times.popleft()
self.values.popleft()
@property
def avg(self):
sum = float(self.sum)
if not self.window_size:
return 0
return sum / self.window_size / self.window_interval
@property
def sum(self):
self._trim_window()
return sum(self.values) + self.cache_value
def empty(self):
self._trim_window()
if not self.values and not self.cache_start:
return True
def on_append(self, value, time):
pass
class CounterValue(DictMixin):
"""
A dict like value item for CounterManager.
"""
def __init__(self, manager, keys):
self.manager = manager
self._keys = keys
def __getitem__(self, key):
if key == '__value__':
key = self._keys
return self.manager.counters[key]
else:
key = self._keys + (key, )
available_keys = []
for _key in list(self.manager.counters.keys()):
if _key[:len(key)] == key:
available_keys.append(_key)
if len(available_keys) == 0:
raise KeyError
elif len(available_keys) == 1:
if available_keys[0] == key:
return self.manager.counters.get(key)
else:
return CounterValue(self.manager, key)
else:
return CounterValue(self.manager, key)
def __len__(self):
return len(self.keys())
def __iter__(self):
return iter(self.keys())
def __contains__(self, key):
return key in self.keys()
def keys(self):
result = set()
for key in list(self.manager.counters.keys()):
if key[:len(self._keys)] == self._keys:
key = key[len(self._keys):]
result.add(key[0] if key else '__value__')
return result
def to_dict(self, get_value=None):
"""Dump counters as a dict"""
result = {}
for key, value in iteritems(self):
if isinstance(value, BaseCounter):
if get_value is not None:
value = getattr(value, get_value)
result[key] = value
else:
result[key] = value.to_dict(get_value)
return result
class CounterManager(DictMixin):
"""
A dict like counter manager.
When using a tuple as event key, say: ('foo', 'bar'), You can visite counter
with manager['foo']['bar']. Or get all counters which first element is 'foo'
by manager['foo'].
It's useful for a group of counters.
"""
def __init__(self, cls=TimebaseAverageWindowCounter):
"""init manager with Counter cls"""
self.cls = cls
self.counters = {}
def event(self, key, value=1):
"""Fire a event of a counter by counter key"""
if isinstance(key, six.string_types):
key = (key, )
assert isinstance(key, tuple), "event key type error"
if key not in self.counters:
self.counters[key] = self.cls()
self.counters[key].event(value)
return self
def value(self, key, value=1):
"""Set value of a counter by counter key"""
if isinstance(key, six.string_types):
key = (key, )
# assert all(isinstance(k, six.string_types) for k in key)
assert isinstance(key, tuple), "event key type error"
if key not in self.counters:
self.counters[key] = self.cls()
self.counters[key].value(value)
return self
def trim(self):
"""Clear not used counters"""
for key, value in list(iteritems(self.counters)):
if value.empty():
del self.counters[key]
def __getitem__(self, key):
key = (key, )
available_keys = []
for _key in list(self.counters.keys()):
if _key[:len(key)] == key:
available_keys.append(_key)
if len(available_keys) == 0:
raise KeyError
elif len(available_keys) == 1:
if available_keys[0] == key:
return self.counters.get(key)
else:
return CounterValue(self, key)
else:
return CounterValue(self, key)
def __delitem__(self, key):
key = (key, )
available_keys = []
for _key in list(self.counters.keys()):
if _key[:len(key)] == key:
available_keys.append(_key)
for _key in available_keys:
del self.counters[_key]
def __iter__(self):
return iter(self.keys())
def __len__(self):
return len(self.keys())
def keys(self):
result = set()
for key in self.counters.keys():
result.add(key[0] if key else ())
return result
def to_dict(self, get_value=None):
"""Dump counters as a dict"""
self.trim()
result = {}
for key, value in iteritems(self.counters):
if get_value is not None:
value = getattr(value, get_value)
r = result
for _key in key[:-1]:
r = r.setdefault(_key, {})
r[key[-1]] = value
return result
def dump(self, filename):
"""Dump counters to file"""
try:
with open(filename, 'wb') as fp:
cPickle.dump(self.counters, fp)
except Exception as e:
logging.warning("can't dump counter to file %s: %s", filename, e)
return False
return True
def load(self, filename):
"""Load counters to file"""
try:
with open(filename, 'rb') as fp:
self.counters = cPickle.load(fp)
except:
logging.debug("can't load counter from file: %s", filename)
return False
return True