Fix RequestsInstrumentor for custom transport adapters (#562)

* Fix RequestsInstrumentor for custom transport adapters
remove dead/leftover code from an early metrics implementation which
tried to access the raw.version attribute on the response object.
The 'version' attribute might not be present in every case, especially
when custom transport adapters are used.

CHANGELOG.md

@@ -38,6 +38,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#558](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/558))
 - Change `opentelemetry-instrumentation-httpx` to replace `client` classes with instrumented versions.
   ([#577](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/577))
+- `opentelemetry-instrumentation-requests` Fix potential `AttributeError` when `requests`
+  is used with a custom transport adapter.
+  ([#562](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/562))
 
 ### Added
 - `opentelemetry-instrumentation-httpx` Add `httpx` instrumentation

instrumentation/opentelemetry-instrumentation-requests/src/opentelemetry/instrumentation/requests/__init__.py

@@ -131,10 +131,6 @@ def _instrumented_requests_call(
 
         url = remove_url_credentials(url)
 
-        labels = {}
-        labels[SpanAttributes.HTTP_METHOD] = method
-        labels[SpanAttributes.HTTP_URL] = url
-
         with tracer.start_as_current_span(
             span_name, kind=SpanKind.CLIENT
         ) as span:
@@ -165,15 +161,6 @@ def _instrumented_requests_call(
                     span.set_status(
                         Status(http_status_to_status_code(result.status_code))
                     )
-                labels[SpanAttributes.HTTP_STATUS_CODE] = str(
-                    result.status_code
-                )
-                if result.raw and result.raw.version:
-                    labels[SpanAttributes.HTTP_FLAVOR] = (
-                        str(result.raw.version)[:1]
-                        + "."
-                        + str(result.raw.version)[:-1]
-                    )
             if span_callback is not None:
                 span_callback(span, result)
 

instrumentation/opentelemetry-instrumentation-requests/tests/test_requests_integration.py

@@ -17,6 +17,8 @@
 
 import httpretty
 import requests
+from requests.adapters import BaseAdapter
+from requests.models import Response
 
 import opentelemetry.instrumentation.requests
 from opentelemetry import context, trace
@@ -30,6 +32,23 @@
 from opentelemetry.trace import StatusCode
 
 
+class TransportMock:
+    def read(self, *args, **kwargs):
+        pass
+
+
+class MyAdapter(BaseAdapter):
+    def __init__(self, response):
+        super().__init__()
+        self._response = response
+
+    def send(self, *args, **kwargs):  # pylint:disable=signature-differs
+        return self._response
+
+    def close(self):
+        pass
+
+
 class InvalidResponseObjectException(Exception):
     def __init__(self):
         super().__init__()
@@ -38,6 +57,7 @@ def __init__(self):
 
 class RequestsIntegrationTestBase(abc.ABC):
     # pylint: disable=no-member
+    # pylint: disable=too-many-public-methods
 
     URL = "http://httpbin.org/status/200"
 
@@ -335,6 +355,26 @@ def test_requests_timeout_exception(self, *_, **__):
         span = self.assert_span()
         self.assertEqual(span.status.status_code, StatusCode.ERROR)
 
+    def test_adapter_with_custom_response(self):
+        response = Response()
+        response.status_code = 210
+        response.reason = "hello adapter"
+        response.raw = TransportMock()
+
+        session = requests.Session()
+        session.mount(self.URL, MyAdapter(response))
+
+        self.perform_request(self.URL, session)
+        span = self.assert_span()
+        self.assertEqual(
+            span.attributes,
+            {
+                "http.method": "GET",
+                "http.url": self.URL,
+                "http.status_code": 210,
+            },
+        )
+
 
 class TestRequestsIntegration(RequestsIntegrationTestBase, TestBase):
     @staticmethod