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from __future__ import absolute_import, division, unicode_literals
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import functools
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# Use timer that's not susceptible to time of day adjustments.
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try:
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# perf_counter is only present on Py3.3+
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from time import perf_counter as time_now
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except ImportError:
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# fall back to using time
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from time import time as time_now
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def safe_wraps(wrapper, *args, **kwargs):
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"""Safely wraps partial functions."""
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while isinstance(wrapper, functools.partial):
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wrapper = wrapper.func
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return functools.wraps(wrapper, *args, **kwargs)
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class Timer(object):
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"""A context manager/decorator for statsd.timing()."""
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def __init__(self, client, stat, rate=1):
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self.client = client
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self.stat = stat
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self.rate = rate
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self.ms = None
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self._sent = False
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self._start_time = None
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def __call__(self, f):
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"""Thread-safe timing function decorator."""
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@safe_wraps(f)
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def _wrapped(*args, **kwargs):
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start_time = time_now()
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try:
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return f(*args, **kwargs)
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finally:
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elapsed_time_ms = 1000.0 * (time_now() - start_time)
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self.client.timing(self.stat, elapsed_time_ms, self.rate)
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return _wrapped
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def __enter__(self):
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return self.start()
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def __exit__(self, typ, value, tb):
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self.stop()
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def start(self):
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self.ms = None
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self._sent = False
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self._start_time = time_now()
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return self
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def stop(self, send=True):
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if self._start_time is None:
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raise RuntimeError('Timer has not started.')
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dt = time_now() - self._start_time
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self.ms = 1000.0 * dt # Convert to milliseconds.
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if send:
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self.send()
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return self
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def send(self):
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if self.ms is None:
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raise RuntimeError('No data recorded.')
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if self._sent:
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raise RuntimeError('Already sent data.')
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self._sent = True
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self.client.timing(self.stat, self.ms, self.rate)
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