fix(plugin): isolate async callback scope context - #1167
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🧰 Additional context used📓 Path-based instructions (2)Tests should cover the behavior promised by the changed API surface, including error paths and cross-request isolation where relevant.⚙️ CodeRabbit configuration file Files:
Review the Rust runtime for async correctness, scope isolation, middleware ordering, and event lifecycle regressions.⚙️ CodeRabbit configuration file Files:
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WalkthroughThe changes anchor managed events to scope stacks and carry event, trace, and publication context through continuations, native callbacks, and worker invocations. They also update async future and stream destruction and add tests for context propagation, callback isolation, and cancellation cleanup. ChangesScope and event context propagation
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~50 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The reviewed changes introduce no actionable merge-blocking risk. Worker setup failures roll back normally, and the identified poisoned-lock cleanup limitation predates this PR. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Signed-off-by: Alex Fournier <afournier@nvidia.com>
Signed-off-by: Alex Fournier <afournier@nvidia.com>
Signed-off-by: Alex Fournier <afournier@nvidia.com>
Signed-off-by: Alex Fournier <afournier@nvidia.com>
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willkill07
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Doesn't this also apply to the gRPC worker plugin?
…callback-context Signed-off-by: Alex Fournier <afournier@nvidia.com> # Conflicts: # crates/core/src/api/runtime/continuation_context.rs # crates/core/src/api/runtime/scope_stack.rs # crates/core/src/api/shared.rs
Signed-off-by: Alex Fournier <afournier@nvidia.com>
…native-async-callback-context Signed-off-by: Alex Fournier <afournier@nvidia.com> # Conflicts: # crates/core/src/api/runtime.rs # crates/core/src/plugin/dynamic/native.rs # crates/core/src/plugin/dynamic/worker.rs # crates/core/tests/fixtures/worker_plugin/src/main.rs # crates/core/tests/unit/dynamic_worker_tests.rs # crates/plugin/src/async_sdk.rs
afourniernv
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Addressed the gRPC worker path in d4ca848 and merged current main in 69ffbb8. Each worker invocation now gets its own scope-stack, managed-event, publication, and W3C context; PushScope, EmitMark, PopScope, continuations, and cleanup run inside that invocation context. I added deterministic overlap coverage plus real Rust and Python worker integration assertions. Exact-head local results: 1,895 core tests, 38 worker integration tests, 39 native integration tests, and 65 plugin SDK tests passed. Full CI is running. |
…native-async-callback-context Signed-off-by: Alex Fournier <afournier@nvidia.com>
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/core/src/api/runtime/scope_stack.rs:
- Around line 1142-1157: Update `AnchoredActiveEvent` and `thread_active_event`
to verify stack allocation identity rather than relying only on the reusable
pointer value; use a `Weak` reference or equivalent allocation-unique identity.
Clear the thread event and its trace context when `set_thread_scope_stack` or
`sync_thread_scope_stack` binds a different stack, so stale events cannot be
rebased onto an unrelated stack.
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📒 Files selected for processing (14)
crates/core/src/api/runtime.rscrates/core/src/api/runtime/continuation_context.rscrates/core/src/api/runtime/scope_stack.rscrates/core/src/api/shared.rscrates/core/src/plugin/dynamic/native.rscrates/core/src/plugin/dynamic/worker.rscrates/core/tests/fixtures/native_plugin/src/lib.rscrates/core/tests/fixtures/worker_plugin/src/main.rscrates/core/tests/integration/native_plugin_tests.rscrates/core/tests/integration/worker_plugin_tests.rscrates/core/tests/unit/continuation_context_tests.rscrates/core/tests/unit/dynamic_worker_tests.rscrates/core/tests/unit/native_plugin_tests.rscrates/plugin/src/async_sdk.rs
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📓 Path-based instructions (6)
Tests should cover the behavior promised by the changed API surface, including error paths and cross-request isolation where relevant.
⚙️ CodeRabbit configuration file
Files:
crates/core/tests/fixtures/worker_plugin/src/main.rscrates/core/tests/integration/worker_plugin_tests.rscrates/core/tests/unit/continuation_context_tests.rscrates/core/tests/integration/native_plugin_tests.rscrates/core/tests/fixtures/native_plugin/src/lib.rscrates/core/tests/unit/dynamic_worker_tests.rscrates/core/tests/unit/native_plugin_tests.rs
Review the Rust runtime for async correctness, scope isolation, middleware ordering, and event lifecycle regressions.
⚙️ CodeRabbit configuration file
Files:
crates/core/src/api/shared.rscrates/core/tests/fixtures/worker_plugin/src/main.rscrates/core/tests/integration/worker_plugin_tests.rscrates/core/src/api/runtime.rscrates/core/tests/unit/continuation_context_tests.rscrates/core/tests/integration/native_plugin_tests.rscrates/core/src/plugin/dynamic/native.rscrates/core/tests/fixtures/native_plugin/src/lib.rscrates/core/src/api/runtime/continuation_context.rscrates/core/tests/unit/dynamic_worker_tests.rscrates/core/tests/unit/native_plugin_tests.rscrates/core/src/api/runtime/scope_stack.rscrates/core/src/plugin/dynamic/worker.rs
Source excerpt: **Core Rust** Implement the behavior first in `crates/core/src/api/` and related core modules such as `crates/core/src/api/runtime/`, `crates/core/src/codec/`, or `crates/core/src/json.rs`.
📄 CodeRabbit inference engine (.agents/skills/add-binding-feature/SKILL.md)
Files:
crates/core/src/api/shared.rscrates/core/src/api/runtime.rscrates/core/src/api/runtime/continuation_context.rscrates/core/src/api/runtime/scope_stack.rs
Source excerpt: [ ] Core function with doc comment in `crates/core/src/api/`
📄 CodeRabbit inference engine (.agents/skills/add-binding-feature/SKILL.md)
Files:
crates/core/src/api/shared.rscrates/core/src/api/runtime.rscrates/core/src/api/runtime/continuation_context.rscrates/core/src/api/runtime/scope_stack.rs
Source excerpt: Add registration and deregistration APIs in `crates/core/src/api/`.
📄 CodeRabbit inference engine (.agents/skills/add-middleware/SKILL.md)
Files:
crates/core/src/api/shared.rscrates/core/src/api/runtime.rscrates/core/src/api/runtime/continuation_context.rscrates/core/src/api/runtime/scope_stack.rs
Source excerpt: Update the relevant lifecycle owner to call the new chain method at the appropriate pipeline stage.
📄 CodeRabbit inference engine (.agents/skills/add-middleware/SKILL.md)
Files:
crates/core/src/api/shared.rs
🔇 Additional comments (14)
crates/core/src/api/runtime.rs (1)
38-38: LGTM!crates/core/src/api/runtime/continuation_context.rs (1)
12-29: LGTM!Also applies to: 40-40, 54-54, 78-88, 91-120, 141-144
crates/core/src/api/runtime/scope_stack.rs (1)
11-11: LGTM!Also applies to: 650-668, 1063-1063, 1078-1140, 1159-1161, 1171-1174, 1255-1297, 1318-1337
crates/core/src/api/shared.rs (1)
12-14: LGTM!Also applies to: 40-40
crates/core/src/plugin/dynamic/native.rs (1)
30-30: LGTM!Also applies to: 42-42, 2188-2188, 2230-2275, 4093-4118
crates/plugin/src/async_sdk.rs (1)
10-10: LGTM!Also applies to: 691-708, 808-825, 870-879, 894-916, 931-942, 1133-1141
crates/core/tests/fixtures/native_plugin/src/lib.rs (1)
31-49: LGTM!Also applies to: 231-247, 305-334, 425-466
crates/core/tests/integration/native_plugin_tests.rs (1)
10-12: LGTM!Also applies to: 221-229, 488-538, 649-701, 766-825
crates/core/tests/unit/native_plugin_tests.rs (1)
10-10: LGTM!Also applies to: 2444-2533, 5595-5991
crates/core/src/plugin/dynamic/worker.rs (1)
1782-1782: LGTM!Also applies to: 1792-1792, 1813-1813, 1834-1834, 1856-1856, 1871-1871, 1891-1891, 1933-1933, 1985-1985, 2020-2020, 2041-2041, 2086-2086, 2117-2117, 2280-2305, 2563-2563, 2826-2889, 2899-2904, 2932-2974, 3028-3028, 3039-3050, 3476-3476, 3500-3500, 3820-3820
crates/core/tests/fixtures/worker_plugin/src/main.rs (1)
178-186: LGTM!Also applies to: 314-314, 377-432
crates/core/tests/integration/worker_plugin_tests.rs (1)
708-718: LGTM!Also applies to: 763-783, 1725-1738
crates/core/tests/unit/dynamic_worker_tests.rs (1)
1622-1629: LGTM!Also applies to: 1688-1695, 1745-1752, 1801-1808, 1838-1845, 1870-1882, 1892-1892, 1906-1906, 1934-1938, 3257-3257, 3300-3479
crates/core/tests/unit/continuation_context_tests.rs (1)
9-14: LGTM!Also applies to: 89-130
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mnajafian-nv
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mnajafian-nv
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I took a pass at this, lgtm, happy to approve once the CR comment is addressed
Signed-off-by: Alex Fournier <afournier@nvidia.com>
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@mnajafian-nv The CodeRabbit finding is addressed in c22b25a and the review thread is resolved. The fix now uses allocation-safe stack identity, clears stale event and trace context on stack changes, and adds regression coverage for both setters. Core, native-plugin, worker-plugin, and plugin SDK test suites pass locally. |
#### Overview This is one of two independent Relay changes needed for the Switchyard plugin to replay captured routing scopes and marks beneath the managed LLM execution that triggered them. **Timestamped scopes preserve the calls' real timing.** Switchyard captures `libsy.client_call` and `libsy.upstream_attempt` spans while provider work is happening, then publishes the completed hierarchy through Relay. If Relay timestamps those scopes when they are replayed, the provider work has already finished and the recorded durations collapse toward zero. This PR exposes historical scope timestamps consistently across Relay's plugin APIs. It does not change Relay core scope behavior. - [x] I confirm this contribution is my own work, or I have the right to submit it under this project's license. - [x] I searched existing issues and open pull requests, and this does not duplicate existing work. #### Why the existing API is insufficient The ordinary scope methods preserve hierarchy but use the current time. They cannot supply the original captured start and end times. Two Switchyard-only approaches were evaluated: - Emitting scopes live is unsafe when spans overlap because they may close outside Relay's required LIFO order. - Calling the raw `scope_push` and `scope_pop` ABI directly would preserve timing, but would duplicate unsafe pointer handling, JSON conversion, status handling, and scope-handle ownership inside Switchyard. The typed SDK should expose functionality already supported by the ABI. #### Details - Native Rust plugin SDK: add `PluginRuntime::scope_at(...)` and `ScopeGuard::close_at(...)` as typed wrappers over timestamp fields already present in the native ABI. - Rust worker SDK: add `push_scope_at(...)` and `pop_scope_at(...)`. - Python worker SDK: add an optional timezone-aware `timestamp` keyword to `push_scope(...)` and `pop_scope(...)`, matching Relay's existing Python scope convention. - Worker protocol: add optional signed Unix-microsecond fields to the existing `PushScope` and `PopScope` messages. - Host runtime: validate worker timestamps before opening or consuming a scope handle, then publish the supplied times on the real scope events. - Leave all ordinary scope methods unchanged; omitted timestamps retain current-time behavior. This is additive. No existing method, callback, serialized field number, native function table, field layout, or ABI version changes. The worker protocol remains `grpc-v1`; older protobuf hosts ignore the optional fields. A worker that depends on historical timestamp preservation should require Relay 0.10 or newer. #### Relationship and landing order - This PR and [#1167](#1167) are independent and non-breaking; either can land first. - This PR preserves original timing. #1167 preserves correct parentage when native or worker callbacks overlap. - The Switchyard consumer should land after both Relay changes are available. #### Testing - Native plugin SDK unit and historical-scope ownership tests. - Worker protobuf compatibility and presence tests, including explicit epoch and pre-epoch values. - Rust worker SDK request tests and out-of-range rejection before RPC. - Python worker SDK ordinary, epoch, pre-epoch, naive-datetime, and invalid-type tests. - Host runtime round trip proving the final exported start/end events retain the supplied historical timestamps and an invalid pop timestamp does not consume the handle. - Full worker host, worker integration, Python plugin, formatting, and warnings-as-errors checks. #### Where should the reviewer start? Start with the native methods in `crates/plugin/src/lib.rs`, then the worker protocol and host translation in: - `crates/worker-proto/proto/nemo/relay/worker/v1/plugin_worker.proto` - `crates/core/src/plugin/dynamic/worker.rs` - `crates/worker/src/lib.rs` - `python/plugin/src/nemo_relay_plugin/_api.py` #### Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to) - Relates to NVIDIA-NeMo/Switchyard#871. - Companion callback-context draft: #1167 - Switchyard consumer branch: https://github.com/afourniernv/Switchyard/tree/codex/relay-nested-routing-spans ## Summary by CodeRabbit * **New Features** * Scope operations can now use caller-specified start and end times, supporting replay with original timestamps in Rust and Python. * Python scope timestamps must include a timezone; timestamps are transmitted in Unix microseconds. Calls without a timestamp continue using host time. * **Documentation** * Updated runtime and protocol guides with timestamp usage, behavior, and compatibility details. * **Tests** * Added coverage for timestamp transmission, pre-epoch values, invalid inputs, and out-of-range timestamps. Authors: - Alex Fournier (https://github.com/afourniernv) Approvers: - Will Killian (https://github.com/willkill07) - Maryam Najafian (https://github.com/mnajafian-nv) URL: #1166
Signed-off-by: Alex Fournier <afournier@nvidia.com>
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Overview
This is one of two independent Relay changes needed for the Switchyard plugin to replay captured routing scopes and marks beneath the managed LLM execution that triggered them.
Callback-context isolation preserves correct nesting under concurrency. Native async callbacks and gRPC worker invocations can overlap while using Relay runtime operations such as
PushScope,EmitMark, andPopScope. Those operations must see the scope stack, active managed event, publication state, and trace context captured for that invocation. Otherwise one callback can attach work beneath another request or close against the wrong LIFO stack.This PR gives each native callback and worker invocation its own captured Relay context through callback entry, downstream continuation calls, stream polling, and teardown.
Why this belongs in Relay
This is a general plugin-host correctness issue, not Switchyard-specific. A plugin cannot repair invocation identity after Relay has exposed a shared host context.
A Switchyard-only replay lock was tested as the narrowest workaround. It kept each captured tree's push and pop operations together, but did not restore callback-specific managed-event identity. Concurrent trees could still attach beneath the wrong parent.
Details
The teardown handling is part of the same fix: dropping a cancelled future, stream, or invocation outside its captured context can otherwise close scopes against the wrong stack.
This changes internal host context handling only. It adds no public API, changes no callback signature or native function-table layout, changes no worker protocol, and does not bump the native ABI. Existing native and worker plugins remain compatible.
Relationship and landing order
mainand reconciles the trace-context work from #1145 and the execution-codec context from #1133.Testing
Where should the reviewer start?
Start with the invocation-context setup in:
crates/core/src/plugin/dynamic/native.rscrates/core/src/plugin/dynamic/worker.rsThen review context installation and teardown in:
crates/core/src/api/runtime/continuation_context.rscrates/core/src/api/runtime/scope_stack.rscrates/plugin/src/async_sdk.rsThe deterministic overlap coverage is in
crates/core/tests/unit/native_plugin_tests.rsandcrates/core/tests/unit/dynamic_worker_tests.rs.Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)
Summary by CodeRabbit