Let the OTel implementation create event timestamps

Let the OTel implementation create event timestamps instead of
generating a timestamp in the shim, i.e. outside of OpenTelemetry.

ext/opentelemetry-ext-opentracing-shim/src/opentelemetry/ext/opentracingshim/__init__.py

@@ -18,7 +18,6 @@
 import opentracing
 
 from opentelemetry.ext.opentracingshim import util
-from opentelemetry.trace import Event
 
 logger = logging.getLogger(__name__)
 
@@ -77,11 +76,10 @@ def log_kv(self, key_values, timestamp=None):
         if timestamp is not None:
             event_timestamp = util.time_seconds_to_ns(timestamp)
         else:
-            event_timestamp = util.time_ns()
+            event_timestamp = None
 
         event_name = util.event_name_from_kv(key_values)
-        event = Event(event_name, event_timestamp, key_values)
-        self._otel_span.add_lazy_event(event)
+        self._otel_span.add_event(event_name, event_timestamp, key_values)
 
         # Return self for call chaining.
         return self

ext/opentelemetry-ext-opentracing-shim/src/opentelemetry/ext/opentracingshim/util.py

@@ -12,17 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import time
-
-try:
-    time_ns = time.time_ns
-# Python versions < 3.7
-except AttributeError:
-
-    def time_ns():
-        return int(time.time() * 1e9)
-
-
 # A default event name to be used for logging events when a better event name
 # can't be derived from the event's key-value pairs.
 DEFAULT_EVENT_NAME = "log"

ext/opentelemetry-ext-opentracing-shim/tests/test_util.py

@@ -16,6 +16,7 @@
 import unittest
 
 from opentelemetry.ext.opentracingshim import util
+from opentelemetry.util import time_ns
 
 
 class TestUtil(unittest.TestCase):
@@ -44,7 +45,7 @@ def test_time_seconds_to_ns(self):
         self.assertEqual(result, int(time_seconds * 1e9))
 
     def test_time_seconds_from_ns(self):
-        time_nanoseconds = util.time_ns()
+        time_nanoseconds = time_ns()
         result = util.time_seconds_from_ns(time_nanoseconds)
 
         self.assertEqual(result, time_nanoseconds / 1e9)