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from __future__ import absolute_import, division, unicode_literals
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import random
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from collections import deque
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from datetime import timedelta
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from .timer import Timer
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class StatsClientBase(object):
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"""A Base class for various statsd clients."""
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def close(self):
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"""Used to close and clean up any underlying resources."""
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raise NotImplementedError()
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def _send(self):
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raise NotImplementedError()
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def pipeline(self):
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raise NotImplementedError()
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def timer(self, stat, rate=1):
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return Timer(self, stat, rate)
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def timing(self, stat, delta, rate=1):
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"""
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Send new timing information.
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`delta` can be either a number of milliseconds or a timedelta.
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"""
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if isinstance(delta, timedelta):
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# Convert timedelta to number of milliseconds.
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delta = delta.total_seconds() * 1000.
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self._send_stat(stat, '%0.6f|ms' % delta, rate)
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def incr(self, stat, count=1, rate=1):
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"""Increment a stat by `count`."""
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self._send_stat(stat, '%s|c' % count, rate)
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def decr(self, stat, count=1, rate=1):
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"""Decrement a stat by `count`."""
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self.incr(stat, -count, rate)
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def gauge(self, stat, value, rate=1, delta=False):
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"""Set a gauge value."""
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if value < 0 and not delta:
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if rate < 1:
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if random.random() > rate:
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return
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with self.pipeline() as pipe:
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pipe._send_stat(stat, '0|g', 1)
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pipe._send_stat(stat, '%s|g' % value, 1)
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else:
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prefix = '+' if delta and value >= 0 else ''
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self._send_stat(stat, '%s%s|g' % (prefix, value), rate)
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def set(self, stat, value, rate=1):
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"""Set a set value."""
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self._send_stat(stat, '%s|s' % value, rate)
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def _send_stat(self, stat, value, rate):
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self._after(self._prepare(stat, value, rate))
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def _prepare(self, stat, value, rate):
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if rate < 1:
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if random.random() > rate:
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return
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value = '%s|@%s' % (value, rate)
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if self._prefix:
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stat = '%s.%s' % (self._prefix, stat)
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return '%s:%s' % (stat, value)
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def _after(self, data):
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if data:
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self._send(data)
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class PipelineBase(StatsClientBase):
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def __init__(self, client):
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self._client = client
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self._prefix = client._prefix
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self._stats = deque()
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def _send(self):
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raise NotImplementedError()
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def _after(self, data):
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if data is not None:
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self._stats.append(data)
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def __enter__(self):
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return self
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def __exit__(self, typ, value, tb):
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self.send()
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def send(self):
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if not self._stats:
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return
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self._send()
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def pipeline(self):
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return self.__class__(self)
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