'DefaultSpan' object has no attribute 'start' (Azure#11728)

* 'DefaultSpan' object has no attribute 'start'

* Apply suggestions from code review

Author: Rakshith Bhyravabhotla

sdk/core/azure-core-tracing-opentelemetry/azure/core/tracing/ext/opentelemetry_span/__init__.py

@@ -15,12 +15,12 @@
 from ._version import VERSION
 
 try:
-    from typing import TYPE_CHECKING
+    from typing import TYPE_CHECKING, ContextManager
 except ImportError:
     TYPE_CHECKING = False
 
 if TYPE_CHECKING:
-    from typing import Any, Mapping, Dict, Optional, Union, Callable, Sequence
+    from typing import Any, Mapping, MutableMapping, Dict, Optional, Union, Callable, Sequence
 
     from azure.core.pipeline.transport import HttpRequest, HttpResponse
     AttributeValue = Union[
@@ -47,7 +47,7 @@ def _get_headers_from_http_request_headers(headers: "Mapping[str, Any]", key: st
     return [headers.get(key, "")]
 
 
-def _set_headers_from_http_request_headers(headers: "Mapping[str, Any]", key: str, value: str):
+def _set_headers_from_http_request_headers(headers: "MutableMapping[str, Any]", key: str, value: str):
     """Set headers in the given headers dict.
 
     Must comply to opentelemetry.context.propagation.httptextformat.Setter:
@@ -80,12 +80,12 @@ def span_instance(self):
         return self._span_instance
 
     def span(self, name="span"):
-        # type: (Optional[str]) -> OpenCensusSpan
+        # type: (Optional[str]) -> OpenTelemetrySpan
         """
         Create a child span for the current span and append it to the child spans list in the span instance.
         :param name: Name of the child span
         :type name: str
-        :return: The OpenCensusSpan that is wrapping the child span instance
+        :return: The OpenTelemetrySpan that is wrapping the child span instance
         """
         return self.__class__(name=name)
 
@@ -123,7 +123,6 @@ def kind(self, value):
 
     def __enter__(self):
         """Start a span."""
-        self.start()
         self._current_ctxt_manager = self.get_current_tracer().use_span(self._span_instance, end_on_exit=True)
         self._current_ctxt_manager.__enter__()
         return self
@@ -135,9 +134,8 @@ def __exit__(self, exception_type, exception_value, traceback):
             self._current_ctxt_manager = None
 
     def start(self):
-        # type: () -> None
-        """Set the start time for a span."""
-        self.span_instance.start()
+        # Spans are automatically started at their creation with OpenTelemetry
+        pass
 
     def finish(self):
         # type: () -> None
@@ -167,6 +165,7 @@ def add_attribute(self, key, value):
         self.span_instance.set_attribute(key, value)
 
     def get_trace_parent(self):
+        # type: () -> str
         """Return traceparent string as defined in W3C trace context specification.
 
         Example:

sdk/core/azure-core/azure/core/tracing/_abstract_span.py

@@ -131,7 +131,7 @@ def span_instance(self):
 
     @classmethod
     def link(cls, traceparent, attributes=None):
-        # type: (Dict[str, str], Attributes) -> None
+        # type: (str, Attributes) -> None
         """
         Given a traceparent, extracts the context and links the context to the current tracer.