flipt-engine-ffi

Flipt Engine FFI

This is the FFI layer for the Flipt client-side SDKs. It is written in Rust and exposes a C API for the SDKs to use.

It leverages the flipt-evaluation library to perform the actual evaluation.

Architecture

See ARCHITECTURE.md.

Prerequisites

• Rust

Build

cargo build -p flipt-engine-ffi --release

There are some language SDKs that might require a C file header which has the definitions of the functions accessible through the FFI layer.

We use cbindgen to generate the C file header automatically at build time. The generated header is located in the include directory.

Logging

The FFI layer uses the log and env_logger crates for logging. The FLIPT_ENGINE_LOG environment variable can be used to set the log level.

export FLIPT_ENGINE_LOG=debug

Test

cargo test -p flipt-engine-ffi