fix: support scoped async functions

[marandaneto]

💡 Motivation and Context

Fixes #568.

posthog.scoped() previously wrapped async functions with a synchronous wrapper. That entered and exited the PostHog context before the returned coroutine was awaited, so context values such as identify_context() were unavailable inside async middleware/routes.

💚 How did you test it?

• .venv/bin/python -m pytest posthog/test/test_contexts.py -q
• .venv/bin/python -m ruff check posthog/contexts.py posthog/test/test_contexts.py

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Ran sampo add to generate a changeset file

[greptile-apps]

Prompt To Fix All With AI

Fix the following 2 code review issues. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 2
posthog/test/test_contexts.py:236-275
**Concurrent-task isolation not tested**

The primary motivation for this fix is that `@posthog.scoped()` is used on async route/middleware handlers that run concurrently in the same event loop. The new tests only verify single-task sequential execution via `asyncio.run()`, so they don't exercise the `contextvars` isolation that matters most in practice. A test using `asyncio.gather()` — where two coroutines set different identities simultaneously — would confirm that each task's `_context_stack` remains independent. Without it, a regression that replaces the `ContextVar` with a plain global would still pass the current tests.

### Issue 2 of 2
posthog/test/test_contexts.py:236-249
**New tests could be parameterised alongside their sync equivalents**

Per the project's preference for parameterised tests, `test_scoped_decorator_async_function` and `test_scoped_decorator_async_exception` largely mirror `test_scoped_decorator_with_context_ids` and `test_scoped_decorator_exception`. Parameterising them with `(sync_func, async_runner)` pairs (e.g. using `subTest` or a helper) would eliminate the duplication and make it trivial to add further variants without copy-pasting.

_{Reviews (1): Last reviewed commit: "fix: support scoped async functions" | Re-trigger Greptile}

[greptile-apps]

_{Reviews (2): Last reviewed commit: "test: cover concurrent scoped async isol..." | Re-trigger Greptile}

[greptile-apps]

_{Reviews (3): Last reviewed commit: "test: parameterize scoped async cases" | Re-trigger Greptile}

[github-actions]

posthog-python Compliance Report

Date: 2026-05-13 14:15:46 UTC
Duration: 4674924ms

⚠️ Some Tests Failed

29/45 tests passed, 16 failed

---

Capture Tests

✅ 29/29 tests passed

View Details

Test	Status	Duration
Format Validation.Event Has Required Fields	✅	517ms
Format Validation.Event Has Uuid	✅	1507ms
Format Validation.Event Has Lib Properties	✅	1507ms
Format Validation.Distinct Id Is String	✅	1507ms
Format Validation.Token Is Present	✅	1507ms
Format Validation.Custom Properties Preserved	✅	1507ms
Format Validation.Event Has Timestamp	✅	1507ms
Retry Behavior.Retries On 503	✅	9518ms
Retry Behavior.Does Not Retry On 400	✅	3507ms
Retry Behavior.Does Not Retry On 401	✅	3507ms
Retry Behavior.Respects Retry After Header	✅	9510ms
Retry Behavior.Implements Backoff	✅	23533ms
Retry Behavior.Retries On 500	✅	7501ms
Retry Behavior.Retries On 502	✅	7517ms
Retry Behavior.Retries On 504	✅	7512ms
Retry Behavior.Max Retries Respected	✅	23521ms
Deduplication.Generates Unique Uuids	✅	1505ms
Deduplication.Preserves Uuid On Retry	✅	7515ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	14519ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	7511ms
Deduplication.No Duplicate Events In Batch	✅	1504ms
Deduplication.Different Events Have Different Uuids	✅	1507ms
Compression.Sends Gzip When Enabled	✅	1507ms
Batch Format.Uses Proper Batch Structure	✅	1507ms
Batch Format.Flush With No Events Sends Nothing	✅	1005ms
Batch Format.Multiple Events Batched Together	✅	1505ms
Error Handling.Does Not Retry On 403	✅	3509ms
Error Handling.Does Not Retry On 413	✅	3508ms
Error Handling.Retries On 408	✅	7510ms

Feature_Flags Tests

⚠️ 0/16 tests passed, 16 failed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	❌	509ms
Request Payload.Flags Request Uses V2 Query Param	❌	300896ms
Request Payload.Flags Request Hits Flags Path Not Decide	❌	300985ms
Request Payload.Flags Request Omits Authorization Header	❌	301015ms
Request Payload.Token In Flags Body Matches Init	❌	301000ms
Request Payload.Groups Round Trip	❌	300991ms
Request Payload.Groups Default To Empty Object	❌	300971ms
Request Payload.Person Properties Distinct Id Auto Populated When Caller Omits It	❌	301038ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	❌	300954ms
Request Payload.Disable Geoip Omitted Defaults To False	❌	300952ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	❌	301039ms
Request Lifecycle.No Flags Request On Init Alone	❌	301031ms
Request Lifecycle.No Flags Request On Normal Capture	❌	301024ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	❌	300922ms
Request Lifecycle.Mock Response Value Is Returned To Caller	❌	301024ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	❌	301055ms

Failures

request_payload.request_with_person_properties_device_id

Field 'token' not found in /flags request body at path 'token'. Available keys: ['distinct_id', 'groups', 'person_properties', 'group_properties', 'geoip_disable', 'device_id', 'flag_keys_to_evaluate', 'sentAt', 'api_key']

request_payload.flags_request_uses_v2_query_param

No error message

request_payload.flags_request_hits_flags_path_not_decide

No error message

request_payload.flags_request_omits_authorization_header

No error message

request_payload.token_in_flags_body_matches_init

No error message

request_payload.groups_round_trip

No error message

request_payload.groups_default_to_empty_object

No error message

request_payload.person_properties_distinct_id_auto_populated_when_caller_omits_it

No error message

request_payload.disable_geoip_false_propagates_as_geoip_disable_false

No error message

request_payload.disable_geoip_omitted_defaults_to_false

No error message

request_payload.flag_keys_to_evaluate_contains_only_requested_key

No error message

request_lifecycle.no_flags_request_on_init_alone

No error message

request_lifecycle.no_flags_request_on_normal_capture

No error message

request_lifecycle.two_flag_calls_produce_two_remote_requests

No error message

request_lifecycle.mock_response_value_is_returned_to_caller

No error message

side_effect_events.get_feature_flag_captures_feature_flag_called_event

No error message