Set status for ended spans

Fixes #292

ext/opentelemetry-ext-pymongo/src/opentelemetry/ext/pymongo/__init__.py

@@ -20,7 +20,13 @@
 from pymongo import monitoring
 
 from opentelemetry.trace import SpanKind
-from opentelemetry.trace.status import Status, StatusCanonicalCode
+from opentelemetry.trace.status import (  # pylint:disable=E0611
+    InternalStatus,
+    OkStatus,
+    Status,
+    StatusCanonicalCode,
+    UnknownStatus,
+)
 
 DATABASE_TYPE = "mongodb"
 COMMAND_ATTRIBUTES = ["filter", "sort", "skip", "limit", "pipeline"]
@@ -72,7 +78,7 @@ def started(self, event: monitoring.CommandStartedEvent):
             self._span_dict[_get_span_dict_key(event)] = span
         except Exception as ex:  # noqa pylint: disable=broad-except
             if span is not None:
-                span.set_status(Status(StatusCanonicalCode.INTERNAL, str(ex)))
+                span.set_status(InternalStatus(str(ex)))
                 span.end()
                 self._remove_span(event)
 
@@ -82,7 +88,7 @@ def succeeded(self, event: monitoring.CommandSucceededEvent):
             span.set_attribute(
                 "db.mongo.duration_micros", event.duration_micros
             )
-            span.set_status(Status(StatusCanonicalCode.OK, event.reply))
+            span.set_status(OkStatus())
             span.end()
             self._remove_span(event)
 
@@ -92,7 +98,7 @@ def failed(self, event: monitoring.CommandFailedEvent):
             span.set_attribute(
                 "db.mongo.duration_micros", event.duration_micros
             )
-            span.set_status(Status(StatusCanonicalCode.UNKNOWN, event.failure))
+            span.set_status(UnknownStatus())
             span.end()
             self._remove_span(event)
 

ext/opentelemetry-ext-pymongo/tests/test_pymongo_integration.py

@@ -82,7 +82,7 @@ def test_succeeded(self):
         self.assertIs(
             span.status.canonical_code, trace_api.status.StatusCanonicalCode.OK
         )
-        self.assertEqual(span.status.description, "reply")
+        self.assertIs(span.status.description, None)
         self.assertIsNotNone(span.end_time)
 
     def test_failed(self):
@@ -100,7 +100,7 @@ def test_failed(self):
             span.status.canonical_code,
             trace_api.status.StatusCanonicalCode.UNKNOWN,
         )
-        self.assertEqual(span.status.description, "failure")
+        self.assertIs(span.status.description, None)
         self.assertIsNotNone(span.end_time)
 
     def test_multiple_commands(self):

opentelemetry-api/src/opentelemetry/trace/__init__.py

@@ -66,7 +66,11 @@
 import typing
 from contextlib import contextmanager
 
-from opentelemetry.trace.status import Status
+from opentelemetry.trace.status import (  # type: ignore # pylint:disable=E0611
+    Status,
+    StatusError,
+    UnknownStatus,
+)
 from opentelemetry.util import loader, types
 
 # TODO: quarantine
@@ -124,10 +128,12 @@ class SpanKind(enum.Enum):
     https://github.com/open-telemetry/opentelemetry-specification/pull/226.
     """
 
-    #: Default value. Indicates that the span is used internally in the application.
+    #: Default value. Indicates that the span is used internally in the
+    # application.
     INTERNAL = 0
 
-    #: Indicates that the span describes an operation that handles a remote request.
+    #: Indicates that the span describes an operation that handles a remote
+    # request.
     SERVER = 1
 
     #: Indicates that the span describes a request to some remote service.
@@ -147,6 +153,10 @@ class SpanKind(enum.Enum):
 class Span:
     """A span represents a single operation within a trace."""
 
+    def __init__(self, auto_update_status: bool = False):
+        # FIXME what is the standard to follow for documentation of attributes?
+        self._auto_update_status = auto_update_status
+
     def start(self, start_time: typing.Optional[int] = None) -> None:
         """Sets the current time as the span's start time.
 
@@ -223,6 +233,9 @@ def set_status(self, status: Status) -> None:
         Span status, which is OK.
         """
 
+    def get_status(self) -> Status:
+        """Gets the Status of the Span."""
+
     def __enter__(self) -> "Span":
         """Invoked when `Span` is used as a context manager.
 
@@ -237,8 +250,20 @@ def __exit__(
         exc_tb: typing.Optional[python_types.TracebackType],
     ) -> None:
         """Ends context manager and calls `end` on the `Span`."""
+
         self.end()
 
+        if (
+            exc_val is not None
+            and self.get_status is None
+            and self._auto_update_status
+        ):
+            if isinstance(exc_val, StatusError):
+                self.set_status(exc_val.status)
+
+            else:
+                self.set_status(UnknownStatus)
+
 
 class TraceOptions(int):
     """A bitmask that represents options specific to the trace.
@@ -353,6 +378,7 @@ class DefaultSpan(Span):
     """
 
     def __init__(self, context: "SpanContext") -> None:
+        super(DefaultSpan, self).__init__()
         self._context = context
 
     def get_context(self) -> "SpanContext":
@@ -501,6 +527,7 @@ def create_span(
         kind: SpanKind = SpanKind.INTERNAL,
         attributes: typing.Optional[types.Attributes] = None,
         links: typing.Sequence[Link] = (),
+        **kwargs: bool,
     ) -> "Span":
         """Creates a span.