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4a57012560
Adds the litellm-router-core crate, its step-driven PyO3 bridge (RouterCoreHandle / RouterCall) and RustCore, served behind LITELLM_RUST through the ROUTER route rule. The host call-out is the only boundary: every attempt goes through Host::invoke, there is no native executor path, and RustCore never builds, wraps or forwards to PythonCore, so router_python_core.py stays deletable. Attempt preparation lives in litellm/router_attempt.py so it outlives router_python_core.py. RustCore matches PythonCore's behavior, including its known bugs (fixed in follow-up PRs). Routing decisions (strategy picks, routing groups, PTU, pre-routing, pre-call checks, fallback walk, health routing, access groups, weights, cooldowns, allowed fails, usage) live in the crate; work that needs live Python objects (request shaping, endpoints, streaming, model info facts, callbacks, alerting, prompt management) lives in host-side litellm/router_rust_*.py modules driven by Rust steps. The crate owns the registry. It runs the deployment build loop (secret references, ids, organization fan-out, install order) and asks the host for what needs Python, one deployment at a time so errors surface where Python raised them: secrets, validate, provider and added steps. It holds the model list, the index maps and the pattern routers with the Python core's history rules (host_index.rs), and answers the registry lookups (lookup.rs). The Python views of that state (model_list, index(), names(), patterns()) read the handle, and every write to them becomes a changeset. Model info, deployment model info, configured limits and model group info are merged in the crate (model_info.rs, group_info.rs) from catalog rows and facts the host answers on a model_info step asked at query time, so price reloads and register_model stay visible. The usage cache key format is defined once, in the crate. tests/unit/test_router/core characterizes PythonCore's public behavior and runs every test on both cores; the remaining Rust differences (the router's own outcome callbacks) are listed in rust_parity_pending.txt. |
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| .. | ||
| .agents/skills | ||
| crates | ||
| docs/adrs | ||
| .gitignore | ||
| AGENTS.md | ||
| Cargo.lock | ||
| Cargo.toml | ||
| clippy.toml | ||