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# SPDX-License-Identifier: AGPL-3.0-or-later
import decimal
import threading
from searx import logger
__all__ = ["Histogram", "HistogramStorage", "CounterStorage"]
logger = logger.getChild('searx.metrics')
class Histogram:
_slots__ = '_lock', '_size', '_sum', '_quartiles', '_count', '_width'
def __init__(self, width=10, size=200):
self._lock = threading.Lock()
self._width = width
self._size = size
self._quartiles = [0] * size
self._count = 0
self._sum = 0
def observe(self, value):
q = int(value / self._width)
if q < 0:
"""Value below zero is ignored"""
q = 0
if q >= self._size:
"""Value above the maximum is replaced by the maximum"""
q = self._size - 1
with self._lock:
self._quartiles[q] += 1
self._count += 1
self._sum += value
@property
def quartiles(self):
return list(self._quartiles)
@property
def count(self):
return self._count
@property
def sum(self):
return self._sum
@property
def average(self):
with self._lock:
if self._count != 0:
return self._sum / self._count
else:
return 0
@property
def quartile_percentage(self):
'''Quartile in percentage'''
with self._lock:
if self._count > 0:
return [int(q * 100 / self._count) for q in self._quartiles]
else:
return self._quartiles
@property
def quartile_percentage_map(self):
result = {}
# use Decimal to avoid rounding errors
x = decimal.Decimal(0)
width = decimal.Decimal(self._width)
width_exponent = -width.as_tuple().exponent
with self._lock:
if self._count > 0:
for y in self._quartiles:
yp = int(y * 100 / self._count)
if yp != 0:
result[round(float(x), width_exponent)] = yp
x += width
return result
def percentage(self, percentage):
# use Decimal to avoid rounding errors
x = decimal.Decimal(0)
width = decimal.Decimal(self._width)
stop_at_value = decimal.Decimal(self._count) / 100 * percentage
sum_value = 0
with self._lock:
if self._count > 0:
for y in self._quartiles:
sum_value += y
if sum_value >= stop_at_value:
return x
x += width
return None
def __repr__(self):
return "Histogram<avg: " + str(self.average) + ", count: " + str(self._count) + ">"
class HistogramStorage:
__slots__ = 'measures'
def __init__(self):
self.clear()
def clear(self):
self.measures = {}
def configure(self, width, size, *args):
measure = Histogram(width, size)
self.measures[args] = measure
return measure
def get(self, *args):
return self.measures.get(args, None)
def dump(self):
logger.debug("Histograms:")
ks = sorted(self.measures.keys(), key='/'.join)
for k in ks:
logger.debug("- %-60s %s", '|'.join(k), self.measures[k])
class CounterStorage:
__slots__ = 'counters', 'lock'
def __init__(self):
self.lock = threading.Lock()
self.clear()
def clear(self):
with self.lock:
self.counters = {}
def configure(self, *args):
with self.lock:
self.counters[args] = 0
def get(self, *args):
return self.counters[args]
def add(self, value, *args):
with self.lock:
self.counters[args] += value
def dump(self):
with self.lock:
ks = sorted(self.counters.keys(), key='/'.join)
logger.debug("Counters:")
for k in ks:
logger.debug("- %-60s %s", '|'.join(k), self.counters[k])
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