llmtrim-uniffi
UniFFI bindings over llmtrim-core: one Rust
definition, idiomatic in-process bindings for Python, Ruby, Swift and Kotlin. The
compression runs natively in the caller's process (no server, no async).
API
A deliberately flat surface over the engine:
fn compress(
input: String, // a provider-shaped request body (JSON)
provider: Option<Provider>, // OpenAi | Anthropic | Google, or None to auto-detect
preset: Option<String>, // "aggressive" | "agent" | "code" | "rag" | "safe" | …
// None = config from the environment / config file
) -> Result<CompressOutput, LlmtrimError>
CompressOutput carries the compressed request_json, the resolved provider/model,
the tokenizer label/exactness, and the before/after/frozen input-token counts. Embedders
that need the full rehydration plan or per-stage reports should depend on llmtrim-core
directly in Rust.
In-process vs. the proxy
llmtrim has two integration routes:
- The proxy (
HTTPS_PROXY=127.0.0.1:8788 llmtrim) intercepts your existing traffic and compresses it in flight. Nothing in your code changes, but the client has to route through the proxy and trust its CA. - These bindings compress in your process. You call
compress()on the request body, then send the result with your own HTTP client. No proxy, no CA, no env-var setup.
Use the in-process path when the proxy can't run:
- Sandboxed / serverless functions where you can't set a process-wide
HTTPS_PROXYor run a side process. - Certificate-pinned clients that reject a MITM CA, so the proxy's interception fails.
- Anywhere you'd rather not add a network hop or an extra moving part.
It replaces a per-framework adapter: instead of wiring a hook into each SDK, you compress
the body once and POST it yourself. Runnable end-to-end examples (compress, then send with
your own client) are in examples/.
Python
# Build a self-contained wheel (cdylib + generated glue):
crates/llmtrim-uniffi/scripts/build-wheel.sh --release
pip install target/wheels/llmtrim-*.whl
import llmtrim, json
req = json.dumps({"model": "gpt-4o",
"messages": [{"role": "user", "content": "…"}]})
out = llmtrim.compress(req, llmtrim.Provider.OPEN_AI, "aggressive")
print(out.input_tokens_before, "->", out.input_tokens_after)
# send out.request_json to the provider
Why
build-wheel.shand not plainmaturin build: maturin'sbindings = "uniffi"auto-packaging is sensitive to the maturin↔uniffi version pair. With maturin 1.14 + uniffi 0.31 it builds the native library into the wheel but omits the generated Python glue (empty package__init__.py). The script runs maturin, then injects the freshly generated bindings and repacks the wheel with valid RECORD hashes. Remove it once the auto path packages cleanly.
Ruby / Swift / Kotlin
All targets generate from the same built library, no extra Rust. The generated glue is a build artifact (its checksums are pinned to the library ABI), so it is regenerated per release rather than committed:
crates/llmtrim-uniffi/scripts/generate-bindings.sh out/ # python, ruby, swift, kotlin
Generation needs an unstripped library. Library-mode
uniffi-bindgenreads metadata symbols from the cdylib, but the workspace release profile setsstrip = true. The script therefore generates from the (unstripped) debug build; the native library you ship can be a strippedcargo build --release -p llmtrim-unifficdylib; the glue loads it by name.
Ruby (verified). This is the raw generated binding (module LlmtrimFfi), for a
source build with libllmtrim_ffi.so on the load path. The published gem aliases it to
Llmtrim (require "llmtrim" then Llmtrim.compress(...)); see
packaging/ruby.
require_relative "llmtrim_ffi"
require "json"
out = LlmtrimFfi.compress(
JSON.generate({model: "gpt-4o", messages: [{role: "user", content: "…"}]}),
LlmtrimFfi::Provider::OPEN_AI, "aggressive")
puts "#{out.input_tokens_before} -> #{out.input_tokens_after}"
Swift emits llmtrim_ffi.swift + an FFI header and modulemap; Kotlin emits
uniffi/.../llmtrim_ffi.kt (which loads the cdylib via JNA). CI compiles and runs a smoke
for both: Swift on macOS (swiftc against the modulemap), Kotlin on a JVM (kotlinc +
JNA), so a binding break is caught in all four languages (see tests/swift, tests/kotlin
and the bindings* jobs in .github/workflows/ci.yml).
Publishable packages
Each ships the compiled engine bundled, so consumers need no Rust toolchain:
| Target | Build | Package | Verified |
|---|---|---|---|
| Python (PyPI) | scripts/build-wheel.sh |
wheel | locally |
| Ruby (gem) | scripts/build-gem.sh |
packaging/ruby/ |
locally |
| Kotlin/JVM (Maven) | scripts/build-maven.sh |
packaging/kotlin/ |
locally |
| Swift (SwiftPM) | scripts/build-xcframework.sh |
packaging/swift/ |
macOS CI only |
Each packaging/<lang>/README.md has the usage + publish details.
1 maintainer
Metadata
1 maintainer
Release files for llmtrim 0.13.6
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| llmtrim-0.13.6-py3-none-win_amd64.whl | Python 3 | none | Windows x86-64 | Details |
| llmtrim-0.13.6-py3-none-manylinux_2_34_x86_64.whl | Python 3 | none | Linux glibc 2.34+ x86-64 | Details |
| llmtrim-0.13.6-py3-none-manylinux_2_34_aarch64.whl | Python 3 | none | Linux glibc 2.34+ ARM64 | Details |
| llmtrim-0.13.6-py3-none-macosx_11_0_arm64.whl | Python 3 | none | macOS 11.0+ ARM64 | Details |
| llmtrim-0.13.6-py3-none-macosx_10_12_x86_64.whl | Python 3 | none | macOS 10.12+ x86-64 | Details |
Total release size: 41.0 MB
Release files / llmtrim-0.13.6-py3-none-win_amd64.whl
| Download URL | llmtrim-0.13.6-py3-none-win_amd64.whl |
|---|---|
| Size | 8.0 MB |
| Tags | Python 3 Windows x86-64 |
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