fix: resolve asyncio event loop bug when gevent is installed (#11904)

## Description

Reverts a change
([4e31278](4e31278))
that introduced a regression in asyncio event loops when gevent is
installed. This issue cannot be reproduced on macOS; it was detected on
Ubuntu 24.

## Background
- In ddtrace v2.11.0, the ddtrace-py [introduced
support](dc000ae)
for crash tracking, and the crash tracker is started via ddtrace-run or
by importing ddtrace.auto
([here](https://github.com/DataDog/dd-trace-py/blob/main/ddtrace/auto.py)).
- Before the crash tracker is started, it [reads the agent
URL](https://github.com/DataDog/dd-trace-py/blob/v2.11.0/ddtrace/internal/core/crashtracking.py#L31)
using the
[ensure_binary](https://github.com/DataDog/dd-trace-py/blob/a58f139e24d78a66468dbc7f67ec42c2bdfad8ee/ddtrace/internal/datadog/profiling/crashtracker/_crashtracker.pyx#L50)
function.
- The ensure_binary function imports unittest.mock, which imports
[asyncio](https://github.com/DataDog/dd-trace-py/blob/v2.11.0/ddtrace/internal/compat.py#L72)
as a side effect.
- After crash tracking is started, ddtrace unloads all modules that were
imported during the setup of ddtrace features
([here](https://github.com/DataDog/dd-trace-py/blob/main/ddtrace/bootstrap/sitecustomize.py#L120C5-L120C27)).
This includes asyncio.
- At this point, asyncio has been added to and then removed from
sys.modules.
- When asyncio is imported in a user's application event loops fail to
be set. This is seen in the script below (the script was run on Ubuntu
24 with gevent>=24)

### Script
```
import asyncio
import time

loop = asyncio.get_event_loop()
loop_id = id(loop)
new_loop = asyncio.new_event_loop()
new_loop_id = id(new_loop)

print(f"old: {loop_id} new: {new_loop_id}")
asyncio.set_event_loop(new_loop)

check = asyncio.get_event_loop()
check_id = id(check)
print(f"check: {id(check)}")


while check_id != new_loop_id:
    print("MISMATCH")
    print(f"check: {id(check)}")
    time.sleep(1)
    check = asyncio.get_event_loop()
    check_id = id(check)
```

### Output

```
MISMATCH
check: 131621237174144
MISMATCH
check: 131621237174144
MISMATCH
check: 131621237174144
MISMATCH
check: 131621237174144
MISMATCH
check: 131621237174144
MISMATCH
```

## Next steps

Investigate module unloading and asyncio incompatibility

## Checklist
- [x] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
- Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

Author: mabdinur

.github/workflows/test_frameworks.yml

@@ -111,68 +111,6 @@ jobs:
         if: needs.needs-run.outputs.outcome == 'success'
         run: cat debugger-expl.txt
 
-  sanic-testsuite:
-    strategy:
-      matrix:
-        include:
-          # TODO: profiling fails with a timeout error
-          #- suffix: Profiling
-          #  profiling: 1
-          #  iast: 0
-          #  appsec: 0
-          - suffix: IAST
-            profiling: 0
-            iast: 1
-            appsec: 0
-          - suffix: APPSEC
-            profiling: 0
-            iast: 0
-            appsec: 1
-          - suffix: Tracer only
-            profiling: 0
-            iast: 0
-            appsec: 0
-    name: Sanic 24.6 (with ${{ matrix.suffix }})
-    runs-on: ubuntu-20.04
-    needs: needs-run
-    timeout-minutes: 15
-    env:
-      DD_PROFILING_ENABLED: ${{ matrix.profiling }}
-      DD_IAST_ENABLED: ${{ matrix.iast }}
-      DD_APPSEC_ENABLED: ${{ matrix.appsec }}
-      DD_TESTING_RAISE: true
-      CMAKE_BUILD_PARALLEL_LEVEL: 12
-      DD_DEBUGGER_EXPL_OUTPUT_FILE: debugger-expl.txt
-    defaults:
-      run:
-        working-directory: sanic
-    steps:
-      - uses: actions/checkout@v4
-        if: needs.needs-run.outputs.outcome == 'success'
-        with:
-          persist-credentials: false
-          path: ddtrace
-      - uses: actions/checkout@v4
-        if: needs.needs-run.outputs.outcome == 'success'
-        with:
-          persist-credentials: false
-          repository: sanic-org/sanic
-          ref: v24.6.0
-          path: sanic
-      - uses: actions/setup-python@v5
-        if: needs.needs-run.outputs.outcome == 'success'
-        with:
-          python-version: "3.11"
-      - name: Install sanic and dependencies required to run tests
-        if: needs.needs-run.outputs.outcome == 'success'
-        run: pip3 install '.[test]' aioquic
-      - name: Install ddtrace
-        if: needs.needs-run.outputs.outcome == 'success'
-        run: pip3 install ../ddtrace
-      - name: Run tests
-        if: needs.needs-run.outputs.outcome == 'success'
-        run: ddtrace-run pytest -k "not test_reloader and not test_reload_listeners and not test_no_exceptions_when_cancel_pending_request and not test_add_signal and not test_ode_removes and not test_skip_touchup and not test_dispatch_signal_triggers and not test_keep_alive_connection_context and not test_redirect_with_params and not test_keep_alive_client_timeout and not test_logger_vhosts and not test_ssl_in_multiprocess_mode"
-
   django-testsuite:
     strategy:
       matrix:
@@ -963,58 +901,3 @@ jobs:
       - name: Debugger exploration results
         if: needs.needs-run.outputs.outcome == 'success'
         run: cat debugger-expl.txt
-
-  beautifulsoup-testsuite-4_12_3:
-    strategy:
-      matrix:
-        include:
-          # TODO: profiling is disabled due to a bug in the profiler paths
-          # - suffix: Profiling
-          #   profiling: 1
-          #   iast: 0
-          #   appsec: 0
-          - suffix: IAST
-            profiling: 0
-            iast: 1
-            appsec: 0
-          - suffix: APPSEC
-            profiling: 0
-            iast: 0
-            appsec: 1
-          - suffix: Tracer only
-            profiling: 0
-            iast: 0
-            appsec: 0
-    name: Beautifulsoup 4.12.3 (with ${{ matrix.suffix }})
-    runs-on: "ubuntu-latest"
-    needs: needs-run
-    env:
-      DD_TESTING_RAISE: true
-      DD_PROFILING_ENABLED: ${{ matrix.profiling }}
-      DD_IAST_ENABLED: ${{ matrix.iast }}
-      DD_APPSEC_ENABLED: ${{ matrix.appsec }}
-      CMAKE_BUILD_PARALLEL_LEVEL: 12
-      DD_DEBUGGER_EXPL_OUTPUT_FILE: debugger-expl.txt
-    steps:
-      - uses: actions/setup-python@v5
-        if: needs.needs-run.outputs.outcome == 'success'
-        with:
-          python-version: '3.9'
-      - uses: actions/checkout@v4
-        if: needs.needs-run.outputs.outcome == 'success'
-        with:
-          persist-credentials: false
-          path: ddtrace
-      - name: Checkout beautifulsoup
-        if: needs.needs-run.outputs.outcome == 'success'
-        run:  |
-          git clone -b 4.12.3 https://git.launchpad.net/beautifulsoup
-      - name: Install ddtrace
-        if: needs.needs-run.outputs.outcome == 'success'
-        run: pip3 install ./ddtrace
-      - name: Pytest fix
-        if: needs.needs-run.outputs.outcome == 'success'
-        run: pip install pytest==8.2.1
-      - name: Run tests
-        if: needs.needs-run.outputs.outcome == 'success'
-        run: cd beautifulsoup && ddtrace-run pytest

ddtrace/internal/compat.py

@@ -56,32 +56,16 @@
 def ensure_text(s, encoding="utf-8", errors="ignore") -> str:
     if isinstance(s, str):
         return s
-
     if isinstance(s, bytes):
         return s.decode(encoding, errors)
-
-    # Skip the check for Mock objects as they are used in tests
-    from unittest.mock import Mock
-
-    if isinstance(s, Mock):
-        return str(s)
-
     raise TypeError("Expected str or bytes but received %r" % (s.__class__))
 
 
 def ensure_binary(s, encoding="utf-8", errors="ignore") -> bytes:
     if isinstance(s, bytes):
         return s
-
-    # Skip the check for Mock objects as they are used in tests
-    from unittest.mock import Mock
-
-    if isinstance(s, Mock):
-        return bytes(s)
-
     if not isinstance(s, str):
         raise TypeError("Expected str or bytes but received %r" % (s.__class__))
-
     return s.encode(encoding, errors)
 
 

releasenotes/notes/resolves-gevent-asyncio-incompatiblities-246028676b10bea9.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    asyncio: Resolves an issue where asyncio event loops fail to register when ``ddtrace-run``/``import ddtrace.auto`` is used and gevent is installed.

tests/contrib/asyncio/test_lazyimport.py

@@ -16,3 +16,16 @@ def test_lazy_import():
     assert tracer.context_provider.active() is span
     span.finish()
     assert tracer.context_provider.active() is None
+
+
+@pytest.mark.subprocess()
+def test_asyncio_not_imported_by_auto_instrumentation():
+    # Module unloading is not supported for asyncio, a simple workaround
+    # is to ensure asyncio is not imported by ddtrace.auto or ddtrace-run.
+    # If asyncio is imported by ddtrace.auto the asyncio event loop with fail
+    # to register new loops in some platforms (e.g. Ubuntuu).
+    import sys
+
+    import ddtrace.auto  # noqa: F401
+
+    assert "asyncio" not in sys.modules