[Rust Frontend] Support --lora-modules for static adapter loading - #54837
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The flag was declared unsupported, so a deployment that ships a fixed adapter set had to open the runtime-update endpoint and load adapters after startup. Parse the same forms as Python's LoRAParserAction (`name=path` or a JSON object) and load each adapter through LoraManager before the listener accepts traffic, failing startup on any error as init_static_loras does. Static paths are operator config, so the runtime allowed-prefix check does not apply. base_model_name is carried on the LoraRequest and reported as `parent` in /v1/models. Closes vllm-project#54836 Assisted-by: Claude Signed-off-by: Will Eaton <weaton@redhat.com>
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Testing this alongside #54833, will report back |
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Test report: H200 on coreweave, image built from #54833 plus this branch.
Frontend log at startup:
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What about also passing LoraModulePath here and in register?
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tried it, and it's much cleaner so done!
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe Rust frontend now accepts repeated ChangesStatic LoRA loading
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to Configured adapters now load during startup, and a partial or interrupted load could leave engine state behind while the frontend fails to start. The change is mergeable with owner awareness and follow-up to define rollback or lifecycle cleanup for failed startup batches. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant CLI
participant Config
participant ServerStartup
participant AppState
participant LoraManager
participant EngineCoreClient
CLI->>Config: Parse and forward --lora-modules
Config->>ServerStartup: Provide configured modules
ServerStartup->>AppState: Load static modules
AppState->>LoraManager: load_static_lora(module)
LoraManager->>EngineCoreClient: Register adapter
EngineCoreClient-->>LoraManager: Return load result
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The changes implement the linked issue objectives [ Full details: Out of Scope Changes checkExplanation The changes are directly related to static LoRA adapter configuration and loading. Supporting refactors, configuration updates, API wiring, example initialization, and tests are within the linked issue scope.
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@rust/src/server/src/config.rs`:
- Line 186: Update the value parsing logic in the relevant config parser to
recognize JSON objects explicitly, while treating non-JSON values containing `=`
as shorthand `name=path` entries even when the path contains commas; split only
on the first `=` and preserve the existing JSON parsing behavior for object
input. Add a regression test covering a shorthand path such as
`alice=/adapters/a,b`.
In `@rust/src/server/src/lib.rs`:
- Line 191: Update the static adapter loading flow around load_static_lora in
build_state to select between each load future and shutdown.cancelled(),
matching the existing cancellation pattern. Ensure shutdown cancellation exits
promptly even when load_static_lora remains unresolved, while preserving the
current context handling and successful adapter registration behavior.
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rust/src/cmd/src/cli.rsrust/src/cmd/src/cli/tests.rsrust/src/cmd/src/cli/unsupported.rsrust/src/server/examples/external_engine_openai_qwen.rsrust/src/server/src/config.rsrust/src/server/src/lib.rsrust/src/server/src/lora.rsrust/src/server/src/routes/tests.rsrust/src/server/src/state.rs
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- rust/src/cmd/src/cli/unsupported.rs
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Signed-off-by: Will Eaton <weaton@redhat.com>
The name=path shorthand mirrored Python's comma check, which sent any path containing a comma to the JSON parser. Detect JSON by the leading brace instead. Static adapter loads ran outside the shutdown select, so a hung add_lora blocked Ctrl-C until the engine answered. Signed-off-by: Will Eaton <weaton@redhat.com>
Signed-off-by: Bugen Zhao <i@bugenzhao.com>
Signed-off-by: Bugen Zhao <i@bugenzhao.com>
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LGTM! Added 2 minor refactor commits
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/ci run |
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✅ @wseaton, CI is now available for this PR.
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✅ Triggered Buildkite CI #86955 for commit |
…ra-build-state Signed-off-by: Bugen Zhao <i@bugenzhao.com>
Signed-off-by: Bugen Zhao <i@bugenzhao.com>
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/ci run |
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✅ Triggered Buildkite CI #87123 for commit |
…llm-project#54837) Co-authored-by: Bugen Zhao <i@bugenzhao.com> Signed-off-by: Will Eaton <weaton@redhat.com> Signed-off-by: Bugen Zhao <i@bugenzhao.com> Signed-off-by: Jyotirmoy Roy <jyotirmoyroy649@gmail.com>
2 participants
Closes #54836
The Rust frontend rejected
--lora-modules, so a replica with a fixed adapter set had to open the runtime-update endpoint and load adapters after startup. This parses the same forms as Python (name=pathor a JSON object, repeatable) and loads each adapter throughLoraManagerbefore the listener opens, failing startup on any error likeinit_static_lorasdoes. Static paths skip the runtime allowed-prefix check.base_model_namecomes back asparentin/v1/models.vllm servewithVLLM_USE_RUST_FRONTEND=1already forwardslora_modulesin--args-json, so it just works.Tests cover both CLI forms, repeated flags, bad input,
--args-json, and static loading against the mock engine (parent card, engine without LoRA, engine rejecting the adapter).Related: #51433, #54830, #54833.
AI assistance disclosure
Developed with AI assistance (Claude Code); reviewed and tested by me.
Summary by CodeRabbit
New Features
name=pathor JSON object format.Bug Fixes