[dogstatsd] use monotonic clock source when available for timers

datadog/dogstatsd/context.py

@@ -3,7 +3,10 @@
 # Copyright 2015-Present Datadog, Inc
 # stdlib
 from functools import wraps
-from time import time
+try:
+    from time import monotonic  # type: ignore[attr-defined]
+except ImportError:
+    from time import time as monotonic
 
 # datadog
 from datadog.dogstatsd.context_async import _get_wrapped_co
@@ -40,7 +43,7 @@ def __call__(self, func):
         # Others
         @wraps(func)
         def wrapped(*args, **kwargs):
-            start = time()
+            start = monotonic()
             try:
                 return func(*args, **kwargs)
             finally:
@@ -50,15 +53,15 @@ def wrapped(*args, **kwargs):
     def __enter__(self):
         if not self.metric:
             raise TypeError("Cannot used timed without a metric!")
-        self._start = time()
+        self._start = monotonic()
         return self
 
     def __exit__(self, type, value, traceback):
         # Report the elapsed time of the context manager.
         self._send(self._start)
 
     def _send(self, start):
-        elapsed = time() - start
+        elapsed = monotonic() - start
         use_ms = self.use_ms if self.use_ms is not None else self.statsd.use_ms
         elapsed = int(round(1000 * elapsed)) if use_ms else elapsed
         self.timing_func(self.metric, elapsed, self.tags, self.sample_rate)

datadog/dogstatsd/context_async.py

@@ -20,7 +20,10 @@
 # https://github.com/python/mypy/issues/6897
 ASYNC_SOURCE = r'''
 from functools import wraps
-from time import time
+try:
+    from time import monotonic
+except ImportError:
+    from time import time as monotonic
 
 
 def _get_wrapped_co(self, func):
@@ -29,7 +32,7 @@ def _get_wrapped_co(self, func):
     """
     @wraps(func)
     async def wrapped_co(*args, **kwargs):
-        start = time()
+        start = monotonic()
         try:
             result = await func(*args, **kwargs)
             return result

datadog/threadstats/base.py

@@ -14,6 +14,10 @@
 from contextlib import contextmanager
 from functools import wraps
 from time import time
+try:
+    from time import monotonic  # type: ignore[attr-defined]
+except ImportError:
+    from time import time as monotonic
 
 # datadog
 from datadog.api.exceptions import ApiNotInitialized
@@ -272,12 +276,12 @@ def get_user(user_id):
                 finally:
                     stats.histogram('user.query.time', time.time() - start)
         """
-        start = time()
+        start = monotonic()
         try:
             yield
         finally:
-            end = time()
-            self.timing(metric_name, end - start, end, tags=tags,
+            end = monotonic()
+            self.timing(metric_name, end - start, time(), tags=tags,
                         sample_rate=sample_rate, host=host)
 
     def timed(self, metric_name, sample_rate=1, tags=None, host=None):