pyramid: Only categorize 400s and 500s exceptions as errors (#1136)

* pyramid: Only categorize 400s and 500s exceptions as errors

* Added changelog entry for the fix

* Added a test for 204

Author: nstawski

Diff for: CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased](https://github.com/open-telemetry/opentelemetry-python/compare/v1.12.0rc1-0.31b0...HEAD)
+- Pyramid: Only categorize 400s and 500s exceptions as errors
+  ([#1037](https://github.com/open-telemetry/opentelemetry-python-contrib/issues/1037))
 
 ### Fixed
 - Fix bug in system metrics by checking their configuration

Diff for: instrumentation/opentelemetry-instrumentation-pyramid/src/opentelemetry/instrumentation/pyramid/callbacks.py

@@ -15,7 +15,7 @@
 from logging import getLogger
 
 from pyramid.events import BeforeTraversal
-from pyramid.httpexceptions import HTTPException
+from pyramid.httpexceptions import HTTPError, HTTPException
 from pyramid.settings import asbool
 from pyramid.tweens import EXCVIEW
 
@@ -198,7 +198,9 @@ def trace_tween(request):
 
                 activation = request.environ.get(_ENVIRON_ACTIVATION_KEY)
 
-                if isinstance(response, HTTPException):
+                # Only considering HTTPClientError and HTTPServerError
+                # to make sure HTTPRedirection is not reported as error
+                if isinstance(response, HTTPError):
                     activation.__exit__(
                         type(response),
                         response,

Diff for: instrumentation/opentelemetry-instrumentation-pyramid/tests/pyramid_base_test.py

@@ -24,6 +24,10 @@ def _hello_endpoint(request):
         helloid = int(request.matchdict["helloid"])
         if helloid == 500:
             raise exc.HTTPInternalServerError()
+        if helloid == 302:
+            raise exc.HTTPFound()
+        if helloid == 204:
+            raise exc.HTTPNoContent()
         if helloid == 900:
             raise NotImplementedError()
         return Response("Hello: " + str(helloid))

Diff for: instrumentation/opentelemetry-instrumentation-pyramid/tests/test_automatic.py

@@ -22,6 +22,7 @@
 from opentelemetry.test.test_base import TestBase
 from opentelemetry.test.wsgitestutil import WsgiTestBase
 from opentelemetry.trace import SpanKind
+from opentelemetry.trace.status import StatusCode
 from opentelemetry.util.http import (
     OTEL_INSTRUMENTATION_HTTP_CAPTURE_HEADERS_SERVER_REQUEST,
     OTEL_INSTRUMENTATION_HTTP_CAPTURE_HEADERS_SERVER_RESPONSE,
@@ -93,6 +94,48 @@ def test_registry_name_is_this_module(self):
             config.registry.__name__, __name__.rsplit(".", maxsplit=1)[0]
         )
 
+    def test_redirect_response_is_not_an_error(self):
+        tween_list = "pyramid.tweens.excview_tween_factory"
+        config = Configurator(settings={"pyramid.tweens": tween_list})
+        self._common_initialization(config)
+        resp = self.client.get("/hello/302")
+        self.assertEqual(302, resp.status_code)
+        span_list = self.memory_exporter.get_finished_spans()
+        self.assertEqual(len(span_list), 1)
+        self.assertEqual(span_list[0].status.status_code, StatusCode.UNSET)
+
+        PyramidInstrumentor().uninstrument()
+
+        self.config = Configurator()
+
+        self._common_initialization(self.config)
+
+        resp = self.client.get("/hello/302")
+        self.assertEqual(302, resp.status_code)
+        span_list = self.memory_exporter.get_finished_spans()
+        self.assertEqual(len(span_list), 1)
+
+    def test_204_empty_response_is_not_an_error(self):
+        tween_list = "pyramid.tweens.excview_tween_factory"
+        config = Configurator(settings={"pyramid.tweens": tween_list})
+        self._common_initialization(config)
+        resp = self.client.get("/hello/204")
+        self.assertEqual(204, resp.status_code)
+        span_list = self.memory_exporter.get_finished_spans()
+        self.assertEqual(len(span_list), 1)
+        self.assertEqual(span_list[0].status.status_code, StatusCode.UNSET)
+
+        PyramidInstrumentor().uninstrument()
+
+        self.config = Configurator()
+
+        self._common_initialization(self.config)
+
+        resp = self.client.get("/hello/204")
+        self.assertEqual(204, resp.status_code)
+        span_list = self.memory_exporter.get_finished_spans()
+        self.assertEqual(len(span_list), 1)
+
 
 class TestWrappedWithOtherFramework(
     InstrumentationTest, TestBase, WsgiTestBase