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Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com> Co-authored-by: Ishaan Jaffer <155045088+ishaan-berri@users.noreply.github.com>
57 lines
2 KiB
Markdown
57 lines
2 KiB
Markdown
# LiteLLM Rust
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This workspace contains the staged Rust implementation for LiteLLM.
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`litellm-core` is the LiteLLM SDK in Rust: one entrypoint per top-level call
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that makes the LLM call and hands back a typed response, the same shape as
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`litellm.messages()` in Python.
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```rust
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let response = litellm_core::messages::messages(MessagesRequest {
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model: "claude-sonnet-4-5",
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body,
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api_key: Some(key),
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..
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})
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.await?;
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```
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Python continues to own configuration, retries, routing policy, logging,
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callbacks, spend tracking, and customer plugins until each Rust path has parity
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coverage and production evidence.
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## Crates
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| Crate | Role |
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|-------|------|
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| litellm-core | The SDK. Per-route entrypoints (`messages::messages()`), types, provider transforms (modules under `providers/`), provider resolution, auth, the provider HTTP call, and the router. |
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| litellm-ai-gateway | The axum server (behind the `server` feature) and WebSocket hosts. Translates HTTP/WS to core entrypoints; no provider handlers. |
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| litellm-python-bridge | PyO3 cdylib exposing Rust to the litellm Python SDK — marshals Python objects and calls core entrypoints. |
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Dependency direction (acyclic): litellm-core ← litellm-ai-gateway ← litellm-python-bridge.
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## Layout
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```text
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crates/
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core/ The SDK: route modules + provider transforms.
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src/messages/ mod.rs (entrypoint), types, transformation, prepare, handler, client
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src/providers/anthropic/messages/transformation.rs
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ai-gateway/ Axum server + WebSocket hosts; calls core entrypoints.
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python-bridge/ PyO3 bridge for Python LiteLLM.
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```
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The folder shape follows the Python provider tree:
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`core/src/providers/<provider>/<route>/transformation.rs`. The bridge exposes one
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function per top-level route, mirroring the core entrypoints.
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## Checks
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Run these before pushing Rust changes. GitHub Actions runs the same checks for
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changes under `litellm-rust/`.
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```bash
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cargo fmt --check
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cargo clippy --workspace --all-targets -- -D warnings
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cargo test --workspace
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```
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