refactor(relay): migrate dynamic plugin to switchyard-runner - #528
refactor(relay): migrate dynamic plugin to switchyard-runner#528bbednarski9 wants to merge 18 commits into
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WalkthroughThis change adds a native NeMo Relay plugin crate. It implements configuration loading, request translation, model-based buffered and streaming routing, routing marks, bundle packaging, tests, and documentation. ChangesNeMo Relay plugin
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to The relay plugin can skip target-policy validation in production and return incorrect errors for context-window failures, while repository formatting checks currently fail; merge should be blocked until these issues are corrected. Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 42 functions across 6 files. (8 skipped: 8 unsupported.) ✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Actionable comments posted: 6
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Inline comments:
In `@crates/switchyard-nemo-relay-plugin/scripts/package_bundle.py`:
- Around line 90-92: Update the packaging argument validation around
archive_bundle to reject any archive path whose parent is the output directory
or one of its descendants, including the exact output/plugin.zip case, before
creating the archive. Add a focused regression test covering an archive path
inside output and verify the packaging command fails without producing a bundle.
In `@crates/switchyard-nemo-relay-plugin/src/config.rs`:
- Around line 10-17: Add focused unit tests for protocol_from_call covering each
supported call name and verifying the expected WireFormat, plus an unsupported
name returning None; keep the tests narrowly scoped to this mapping behavior.
In `@crates/switchyard-nemo-relay-plugin/src/lib.rs`:
- Around line 59-115: Add focused unit tests for register_buffered and
register_stream that verify unmanaged requests are forwarded to next.call and
managed requests use the registered interceptor at the configured priority.
Exercise both interceptor registration paths and assert the expected forwarding
and handler behavior without broad refactoring.
In `@crates/switchyard-nemo-relay-plugin/src/runtime.rs`:
- Around line 218-230: Apply standard Rust formatting to error_mark in
crates/switchyard-nemo-relay-plugin/src/runtime.rs lines 218-230 and the
emit_marks conditional in crates/switchyard-nemo-relay-plugin/src/lib.rs lines
122-128; make no behavioral changes.
- Around line 155-162: Update the final-candidate error handling in the
RunnerError::Algorithm path so LlmClientError::ContextWindowExceeded is
classified and returned using the relay response required by
SwitchyardError::ContextWindowExceeded instead of the generic route-execution
failure. Preserve the existing marks and generic handling for other errors, and
add focused regression coverage for both buffered and streaming requests.
In `@crates/switchyard-nemo-relay-plugin/src/translation.rs`:
- Around line 25-34: Update SwitchyardRuntime::execute to call
validate_target_request for each selected target request before invoking
route.execute, ensuring request_policy runs on production requests and rejects
unsupported Anthropic JSON-schema capabilities. Add a focused regression test
covering the Anthropic policy validation.
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CHANGELOG.mdCargo.tomlREADME.mdcrates/switchyard-nemo-relay-plugin/Cargo.tomlcrates/switchyard-nemo-relay-plugin/README.mdcrates/switchyard-nemo-relay-plugin/config.schema.jsoncrates/switchyard-nemo-relay-plugin/relay-plugin.tomlcrates/switchyard-nemo-relay-plugin/scripts/package_bundle.pycrates/switchyard-nemo-relay-plugin/src/config.rscrates/switchyard-nemo-relay-plugin/src/lib.rscrates/switchyard-nemo-relay-plugin/src/runtime.rscrates/switchyard-nemo-relay-plugin/src/translation.rscrates/switchyard-nemo-relay-plugin/tests/test_package_bundle.pydocs/index.md
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bbednarski9
changed the title
switchyard-runner
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Integration-contract mismatch at current Could this PR align the example with the embedded-Hermes activation path and add a focused contract test that parses the documented |
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Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
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Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
| # SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved. | ||
| # SPDX-License-Identifier: Apache-2.0 | ||
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| """Tests for the native Relay plugin bundle packager.""" |
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Are these tests run in CI? The Python job only runs pytest tests/, so this directory appears to be skipped.
not sure if it's worth including or not given that there is no regression protection here and this needs to be manually trigged.
| let Some(inbound) = protocol_from_call(&name) else { | ||
| return next.call(request).await; | ||
| }; | ||
| let decoded = runtime.decode_request(inbound, &request, true)?; |
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Could we check model before decoding? It looks like we translate and clone the body even when we’re just going to pass the request through.
Maybe I'm wrong?
| emit_events(&plugin_runtime, execution.events); | ||
| execution | ||
| .result | ||
| .map(|stream| Box::pin(stream) as LlmJsonAsyncStream) |
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Do we need to box this again? ReturnedEventStream is already the same type as LlmJsonAsyncStream, so I think this can just return execution.result.
| metadata.wire_format = Some(inbound); | ||
| Ok(Request { | ||
| llm_request, | ||
| raw_request: Some(request.content.clone()), |
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Once we check that Switchyard manages this request, can we pass it by value and move content here? This currently clones the full JSON body, while translation already retains another copy for replay.
| if relay_gateway_placeholder { | ||
| metadata.session_id = None; | ||
| } | ||
| metadata.http_headers = Some(headers); |
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Could you avoid forwarding arbitrary inbound Relay headers to the upstream provider? forward_metadata_headers sends every non-reserved header from the request metadata, so caller-controlled headers such as x-ee-review-probe cross the Relay-to-provider boundary. Please restrict this to an explicit allowlist or headers configured for that provider.
| LlmResponse::Agg(response) => response.into_stream(), | ||
| LlmResponse::Stream(chunks) => chunks, | ||
| }; | ||
| let chunks = Box::pin(chunks.map(move |item| { |
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Could you emit token-usage metrics after the streaming response reports its final usage? The provider returns prompt_tokens, completion_tokens, and total_tokens in the final stream event, but Switchyard currently emits only the request and overhead metrics. This causes switchyard.routing.llm_tokens to omit streaming requests.
| let Some(inbound) = protocol_from_call(&name) else { | ||
| return next.call(request).await; | ||
| }; | ||
| let decoded = runtime.decode_request(inbound, &request, false)?; |
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Could you determine route ownership from the raw model field before decoding the full payload? decode_request(...)? can return a Switchyard translation error for a request whose model is not configured as a Switchyard route, so execution never reaches runtime.manages or next.call. The streaming interceptor has the same ordering.
4 participants
What
Stacks the current NeMo Relay dynamic-plugin implementation from #488 on top of #517's
switchyard-runnerextraction.This baseline copy intentionally preserves #488 behavior. Subsequent commits will replace the plugin's duplicated deployment configuration, target-client construction, and route execution with the runner APIs, then remove only behavior that is demonstrably redundant.
Stack
gk-switchyard-runner)feature/nemo-relay-plugin-owned-http-client)Initial validation
git diff --checkcargo metadata --no-deps --format-version 1cargo fmtis not available in the current local Cargo toolchain; CI will run the repository Rust checks.Related
Relates to #488
Relates to #517
Summary by CodeRabbit
New Features
Bug Fixes
Documentation