When batching, same object is mutated destroying exception information (#1187)

Author: calleo

contrib/opencensus-ext-azure/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+- Fix export of exception information in traces 
+([#1187](https://github.com/census-instrumentation/opencensus-python/pull/1187))
+
 ## 1.1.8
 
 Released 2023-01-18

contrib/opencensus-ext-azure/opencensus/ext/azure/trace_exporter/__init__.py

@@ -96,7 +96,8 @@ def span_data_to_envelope(self, sd):
             )
         if sd.span_kind == SpanKind.SERVER:
             if ERROR_MESSAGE in sd.attributes:
-                envelope.name = 'Microsoft.ApplicationInsights.Exception'
+                exc_env = Envelope(**envelope)
+                exc_env.name = 'Microsoft.ApplicationInsights.Exception'
                 data = ExceptionData(
                     exceptions=[{
                         'id': 1,
@@ -107,8 +108,8 @@ def span_data_to_envelope(self, sd):
                         'parsedStack': sd.attributes.get(STACKTRACE, None)
                     }],
                 )
-                envelope.data = Data(baseData=data, baseType='ExceptionData')
-                yield envelope
+                exc_env.data = Data(baseData=data, baseType='ExceptionData')
+                yield exc_env
 
             envelope.name = 'Microsoft.ApplicationInsights.Request'
             data = Request(

contrib/opencensus-ext-azure/tests/test_azure_trace_exporter.py

@@ -498,7 +498,7 @@ def test_span_data_to_envelope(self):
             'RequestData')
 
         # SpanKind.SERVER HTTP - with exceptions
-        envelopes = exporter.span_data_to_envelope(SpanData(
+        envelopes = list(exporter.span_data_to_envelope(SpanData(
             name='test',
             context=SpanContext(
                 trace_id='6e0c63257de34c90bf9efcd03927272e',
@@ -529,9 +529,10 @@ def test_span_data_to_envelope(self):
             same_process_as_parent_span=None,
             child_span_count=None,
             span_kind=SpanKind.SERVER,
-        ))
+        )))
+        self.assertEqual(len(envelopes), 2)
 
-        envelope = next(envelopes)
+        envelope = envelopes[0]
         self.assertEqual(
             envelope.iKey,
             '12345678-1234-5678-abcd-12345678abcd')
@@ -551,7 +552,7 @@ def test_span_data_to_envelope(self):
             envelope.data.baseType,
             'ExceptionData')
 
-        envelope = next(envelopes)
+        envelope = envelopes[1]
         self.assertEqual(
             envelope.iKey,
             '12345678-1234-5678-abcd-12345678abcd')