feat(asgi): Make integration fully span first compatible

[sentrivana]

Description

In span first, there are no event processors. Therefore, we need to be able to set the data we were setting in event processors differently.

As we migrate our integrations one by one, this will be an exercise in whether it's possible to achieve this without some sort of callback/lifecycle hooks. So far, in ASGI, it seems we can get by by simply using scope.set_attribute() for setting request related data, and updating the segment name/source just before the span ends.

Adding this enables us to actually test the new functionality.

To sum up, this PR:

• makes the ASGI integration fully span-first-compatible: data set on spans currently should appear as attributes in span first
• introduces a test helper that makes it easier to unpack envelope items (useful especially when a test checks both old- and new-style telemetry)
• fully tests the ASGI span streaming implementation

Like in other span first PRs, there is quite a bit of intentional code duplication so that it's easier to remove the legacy implementation in the next major.

Issues

• Closes Event processor replacement for streamed spans #5722
• Closes https://linear.app/getsentry/issue/PY-2152/event-processor-replacement-for-streamed-spans

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[linear-code]

PY-2152 Event processor replacement for streamed spans

[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

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[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

📋 Changelog Preview

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[github-actions]

Codecov Results 📊

✅ 142 passed | Total: 142 | Pass Rate: 100% | Execution Time: 21.70s

All tests are passing successfully.

❌ Patch coverage is 7.41%. Project has 14206 uncovered lines.

Files with missing lines (4)

File	Patch %	Lines
traces.py	35.71%	⚠️ 198 Missing
asgi.py	15.61%	⚠️ 173 Missing
_wsgi_common.py	28.24%	⚠️ 94 Missing
_asgi_common.py	14.08%	⚠️ 61 Missing

---

Generated by Codecov Action

[sentrivana]

This is an attributes based copy of _get_request_data just above

[sentrivana]

This is a copy of _get_transaction_name_and_source above, just adapted for segments

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

Bugbot Autofix prepared fixes for both issues found in the latest run.

• ✅ Fixed: Redundant None check after isinstance guard
  • Removed the redundant span is not None condition inside the isinstance(span, StreamedSpan) block to simplify dead logic.
• ✅ Fixed: Duplicate function only differs by enum type used
  • Refactored _get_segment_name_and_source to delegate to _get_transaction_name_and_source and convert the shared enum result to a string, eliminating duplicated logic.

Or push these changes by commenting:

@cursor push d24d2ecc4c

Preview (d24d2ecc4c)

diff --git a/sentry_sdk/integrations/asgi.py b/sentry_sdk/integrations/asgi.py
--- a/sentry_sdk/integrations/asgi.py
+++ b/sentry_sdk/integrations/asgi.py
@@ -27,7 +27,6 @@
 from sentry_sdk.traces import (
     StreamedSpan,
     SegmentSource,
-    SOURCE_FOR_STYLE as SEGMENT_SOURCE_FOR_STYLE,
 )
 from sentry_sdk.tracing import (
     SOURCE_FOR_STYLE,
@@ -45,7 +44,6 @@
     _get_installed_modules,
     reraise,
     capture_internal_exceptions,
-    qualname_from_function,
 )
 
 from typing import TYPE_CHECKING
@@ -364,8 +362,7 @@
                         finally:
                             if isinstance(span, StreamedSpan):
                                 already_set = (
-                                    span is not None
-                                    and span.name != _DEFAULT_TRANSACTION_NAME
+                                    span.name != _DEFAULT_TRANSACTION_NAME
                                     and span.get_attributes().get("sentry.span.source")
                                     in [
                                         SegmentSource.COMPONENT.value,
@@ -460,36 +457,5 @@
     def _get_segment_name_and_source(
         self: "SentryAsgiMiddleware", segment_style: str, asgi_scope: "Any"
     ) -> "Tuple[str, str]":
-        name = None
-        source = SEGMENT_SOURCE_FOR_STYLE[segment_style].value
-        ty = asgi_scope.get("type")
-
-        if segment_style == "endpoint":
-            endpoint = asgi_scope.get("endpoint")
-            # Webframeworks like Starlette mutate the ASGI env once routing is
-            # done, which is sometime after the request has started. If we have
-            # an endpoint, overwrite our generic transaction name.
-            if endpoint:
-                name = qualname_from_function(endpoint) or ""
-            else:
-                name = _get_url(asgi_scope, "http" if ty == "http" else "ws", host=None)
-                source = SegmentSource.URL.value
-
-        elif segment_style == "url":
-            # FastAPI includes the route object in the scope to let Sentry extract the
-            # path from it for the transaction name
-            route = asgi_scope.get("route")
-            if route:
-                path = getattr(route, "path", None)
-                if path is not None:
-                    name = path
-            else:
-                name = _get_url(asgi_scope, "http" if ty == "http" else "ws", host=None)
-                source = SegmentSource.URL.value
-
-        if name is None:
-            name = _DEFAULT_TRANSACTION_NAME
-            source = SegmentSource.ROUTE.value
-            return name, source
-
-        return name, source
+        name, source = self._get_transaction_name_and_source(segment_style, asgi_scope)
+        return name, str(source)

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