ReadableSpan events and links now return a tuple

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [1.6.1-0.25b1](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.6.1-0.25b1) - 2021-10-18
 
+- Fix ReadableSpan property types attempting to create a mapping from a list
+  ([#2215](https://github.com/open-telemetry/opentelemetry-python/pull/2215))
 - Upgrade GRPC/protobuf related dependency and regenerate otlp protobufs
   ([#2201](https://github.com/open-telemetry/opentelemetry-python/pull/2201))
 - Propagation: only warn about oversized baggage headers when headers exist

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

@@ -350,7 +350,7 @@ def __init__(
         parent: Optional[trace_api.SpanContext] = None,
         resource: Resource = Resource.create({}),
         attributes: types.Attributes = None,
-        events: Sequence[Event] = None,
+        events: Sequence[Event] = (),
         links: Sequence[trace_api.Link] = (),
         kind: trace_api.SpanKind = trace_api.SpanKind.INTERNAL,
         instrumentation_info: InstrumentationInfo = None,
@@ -426,11 +426,11 @@ def attributes(self) -> types.Attributes:
 
     @property
     def events(self) -> Sequence[Event]:
-        return MappingProxyType(self._events)
+        return tuple(event for event in self._events)
 
     @property
     def links(self) -> Sequence[trace_api.Link]:
-        return MappingProxyType(self._links)
+        return tuple(link for link in self._links)
 
     @property
     def resource(self) -> Resource:

opentelemetry-sdk/tests/trace/test_trace.py

@@ -569,6 +569,29 @@ def test_surplus_span_attributes(self):
             self.assertEqual(len(root.attributes), max_attrs)
 
 
+class TestReadableSpan(unittest.TestCase):
+    def test_links(self):
+        span = trace.ReadableSpan()
+        self.assertEqual(span.links, ())
+
+        span = trace.ReadableSpan(
+            links=[trace_api.Link(context=trace_api.INVALID_SPAN_CONTEXT)] * 2,
+        )
+        self.assertEqual(len(span.links), 2)
+        for link in span.links:
+            self.assertFalse(link.context.is_valid)
+
+    def test_events(self):
+        span = trace.ReadableSpan()
+        self.assertEqual(span.events, ())
+        events = [
+            trace.Event("foo1", {"bar1": "baz1"}),
+            trace.Event("foo2", {"bar2": "baz2"}),
+        ]
+        span = trace.ReadableSpan(events=events)
+        self.assertEqual(span.events, tuple(events))
+
+
 class TestSpan(unittest.TestCase):
     # pylint: disable=too-many-public-methods