feat(sdk): RL training surface — typed Rust core + python client.rl namespace - #557
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Three layers, replacing the earlier pure-python draft after review
feedback (the SDK's architecture is Rust-core + pyo3; a parallel urllib
transport was the wrong shape):
1. CORE (basilica-sdk): rl.rs DTOs mirroring basilica-api's /rl/* route
DTOs field-for-field — the compiler, not a runtime test, now catches
wire drift. serde-flatten catch-alls on the create requests preserve
unknown fields verbatim (forward-compat / the body= escape hatch).
Client methods beside the transport helpers: create/get cluster + job,
submit_rl_manifest.
2. BINDING (basilica-sdk-python): five rl_* pymethods with a JSON-string
boundary — serde-validates against the core's typed DTOs, sends through
the core transport (inheriting the FULL auth chain incl. the CLI-login
token fallback), returns JSON. Deliberate boundary choice: nine nested
pyclass mirrors would be pure boilerplate (the in-tree precedent).
3. PYTHON (basilica/rl.py): thin RlNamespace — ergonomic kwargs builders,
wait_cluster/wait_job poll loops (wait_job RETURNS a Failed document
rather than raising), client-side judge-requires-custom-reward guard.
BasilicaClient gains a lazy .rl property.
Bonus correctness: the core parses the API's real error envelope
({"error":{code,message,...}}), so RL errors surface the server's
actionable message verbatim — the earlier urllib draft guessed the wrong
envelope and would have shown raw JSON blobs.
Tests: 10 contract tests against the COMPILED extension (maturin develop)
with a real in-process HTTP server — exact wire bodies, ref renames,
escape-hatch field survival, poll-to-terminal both outcomes, client-side
serde rejection before any HTTP, error-envelope mapping to ValueError.
Plus 3 core wire-shape tests (92 core tests green total); clippy clean
both crates.
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WalkthroughChangesRL Training API
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The PR adds the RL client surface, but two bounded correctness issues remain: direct RlNamespace imports fail, and raw-body-only cluster or job creation is rejected before submission. The change is mergeable with explicit owner follow-up. Sequence Diagram(s)sequenceDiagram
participant PythonCaller
participant RlNamespace
participant PythonBinding
participant RustBasilicaClient
participant RLAPI
PythonCaller->>RlNamespace: create_job or submit_manifest
RlNamespace->>PythonBinding: send JSON request
PythonBinding->>RustBasilicaClient: validate and invoke RL method
RustBasilicaClient->>RLAPI: authenticated RL request
RLAPI-->>RustBasilicaClient: JSON response
RustBasilicaClient-->>PythonBinding: typed response
PythonBinding-->>RlNamespace: serialized response
RlNamespace-->>PythonCaller: decoded dictionary
Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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🧪 Generate unit tests (beta)
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WalkthroughThis PR adds a three-layer RL training surface to the Basilica SDK — typed Rust DTOs mirroring the API's Changes
Sequence DiagramsequenceDiagram
participant Py as Python (rl.py)
participant Binding as Pyo3 Binding (lib.rs)
participant Core as Rust Core (client.rs)
participant API as Basilica API /rl/*
Py->>Py: Build wire dict from kwargs<br/>(drop None, rename to camelCase)
Py->>Binding: rl_create_cluster(json.dumps(body))
Binding->>Binding: serde_json::from_str::<CreateRlClusterRequest><br/>(validate BEFORE any HTTP)
alt parse fails
Binding-->>Py: PyValueError("invalid RL cluster request")
else parse ok
Binding->>Core: create_rl_cluster(request).await
Core->>Core: Auth chain<br/>(api_key → BASILICA_API_TOKEN → CLI-login fallback)
Core->>API: POST /rl/clusters (typed body)
alt non-2xx
API-->>Core: {"error":{code,message,...}}
Core-->>Binding: ApiError (mapped)
Binding-->>Py: ValueError / PermissionError / etc.<br/>(server message verbatim)
else 2xx
API-->>Core: CreateRlClusterResponse (JSON)
Core-->>Binding: typed response
Binding-->>Py: serde_json::to_string → JSON string
Py->>Py: json.loads → dict returned
end
end
Estimated review effort: 3/5 (multi-layer with serde wire contracts and an explicit JSON-string boundary design decision to scrutinize, but the scope is additive and well-tested). Instant overview - a deep technical review follows as a separate comment. |
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Inline comments:
In `@crates/basilica-sdk-python/python/basilica/__init__.py`:
- Around line 458-459: Update basilica.__init__ so the RlNamespace symbol
included in __all__ is explicitly imported or otherwise bound at module scope,
ensuring both direct imports and wildcard imports succeed; alternatively remove
RlNamespace from __all__ if it is not intended to be public.
In `@crates/basilica-sdk-python/python/basilica/rl.py`:
- Around line 62-69: Update create_cluster and create_job so body-only calls do
not require builder arguments: default base_model, gpu_model, cluster, and
max_steps to None, and validate those values only when body is None. Preserve
raw body forwarding unchanged, and add tests covering body-only invocation for
both methods.
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crates/basilica-sdk-python/python/basilica/__init__.pycrates/basilica-sdk-python/python/basilica/rl.pycrates/basilica-sdk-python/src/lib.rscrates/basilica-sdk-python/tests/test_rl_client.pycrates/basilica-sdk/src/client.rscrates/basilica-sdk/src/lib.rscrates/basilica-sdk/src/rl.rs
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PR #557: feat(sdk): RL training surface — typed Rust core + python client.rl namespaceSummaryThis PR adds an RL training (GRPO post-training) surface to the Basilica SDK in three layers: (1) Architectureflowchart LR
A["basilica/rl.py<br/>kwargs builders, wait_* polls"] -->|"json.dumps(body)"| B["pyo3 binding<br/>rl_* pymethods"]
B -->|"serde_json::from_str<br/>(typed DTO validation, pre-HTTP)"| C["basilica-sdk core client<br/>create/get cluster+job, manifest"]
C -->|"HTTP + full auth chain<br/>(API key / env / CLI-login fallback)"| D["basilica-api /rl/*<br/>(deny_unknown_fields)"]
The layering is coherent with the SDK's established Rust-core + pyo3 shape: DTOs live in the core next to Issues FoundCRITICAL Issues (Must Fix Before Merge)None found. HIGH Severity Issues (Advised to Fix Before Merge)None found. MEDIUM Severity Issues (Optional to Fix Before Merge)
LOW Severity Issues (Minor Improvements)
Security ReviewSwept the diff's actual surface:
Suggestions for Improvements
Positive Observations
Recommendation and Next StepsCOMMENT — the change is well-architected, coherent with the codebase, and unusually well tested, with no blocking defects; address the four MEDIUM items (orphan-kwarg guards, |
…mantics, name validation
Review findings from Talos + CodeRabbit, all verified before fixing:
- `from basilica import RlNamespace` actually works now (it was in
__all__ but only imported inside the .rl property): PEP 562 module
__getattr__ keeps the import lazy. [confirmed broken by test]
- create_job raises on orphan kwargs (reward_source without reward_name,
dataset fields without dataset_name) instead of silently running the
BUILTIN reward/dataset on a paid GPU job; symmetric with the existing
judge guard.
- wait_cluster: raises immediately on Terminating (it can never become
Ready; burning the full 1800s timeout would hide the failure).
Degraded deliberately keeps polling — fleets recover from transient
unhealth; documented in the code.
- Both wait loops tolerate transient poll errors (ConnectionError /
RuntimeError) up to 5 CONSECUTIVE failures, reset on success — a single
LB blip must not abort a 6-hour wait.
- body= no longer needs placeholder kwargs: the other required kwargs are
checked only when building the request.
- get_rl_cluster/get_rl_job validate DNS-1035 client-side in the core
before the name reaches the URL path (clearer error + path hardening).
- Dead `or {}` removed; module docstring rewritten timeless (no PR
archaeology).
Tests: 15/15 contract tests against the compiled extension (5 new:
wait_cluster poll + Terminating, transient-error budget, orphan guards,
client-side name rejection); core 92 green; clippy clean.
epappas
approved these changes
Aug 26, 2026
This was referenced Aug 26, 2026
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Summary
The RL Training API's SDK surface, built the way this SDK is built — Rust core, pyo3 binding, thin Python — replacing an earlier pure-python draft that lived in the wrong repo with the wrong architecture (a parallel urllib transport beside the real one).
Related Issues
No tracking issue in this repo. Supersedes one-covenant/basilica-backend#1436 (closed — same feature, drafted in the wrong home before this SDK was identified as where client surfaces belong).
Type of Change
Changes Made
basilica-sdk/src/rl.rs, new) — typed DTOs mirroring basilica-api's/rl/*route DTOs field-for-field, so the compiler catches wire drift.serde(flatten)catch-alls on the create requests preserve unknown fields verbatim (forward-compat; thebody=escape hatch depends on it). Five client methods beside the existing transport: create/get cluster, create/get job, submit manifest.basilica-sdk-python/src/lib.rs) — fiverl_*pymethods with a JSON-string boundary: serde-validate against the typed DTOs, send via the core transport (inherits the full auth chain including the CLI-login token fallback), return JSON. Chosen over nine nested pyclass mirrors per the in-tree "pure boilerplate" precedent.basilica/rl.py) — thinRlNamespace: ergonomic kwargs builders,wait_cluster/wait_jobpoll loops (wait_jobreturns aFaileddocument rather than raising — the failure detail belongs in the caller's hands), client-side judge-requires-custom-reward guard.BasilicaClientgains a lazy.rlproperty; the__init__diff is otherwise two lines.{"error": {code, message, …}}), so RL errors surface the server's actionable message verbatim; the superseded urllib draft assumed a different envelope and would have degraded every server error to a raw JSON blob.Testing
How Has This Been Tested?
10 contract tests run against the compiled extension (
maturin develop) with a real in-process HTTP server: exact wire bodies + auth header, the nestedrefserde renames, escape-hatch unknown-field survival through the typed round-trip, poll-to-terminal for both Succeeded and Failed, client-side serde rejection before any HTTP touches the network, and error-envelope →ValueErrormapping carrying the server's message. Plus 3 core wire-shape serde tests.cargo test) — 92 green in basilica-sdkpytest crates/basilica-sdk-python/tests/test_rl_client.pyagainst the built wheelTest Configuration
maturin develop(abi3-py310 wheel)Checklist
cargo fmtto format my codecargo clippyand addressed all warnings/rl/*endpoints are merged in basilica-backend main)Additional Context
The JSON-string binding boundary is a deliberate trade: requests are still validated client-side against the typed core DTOs before any network I/O (test-covered), without duplicating nine nested request/response types as pyclasses. Server-side schema additions flow through both the typed path (flatten catch-alls) and the
body=escape hatch, so an SDK release lag never strands a user.