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