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lib.rs
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lib.rs
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//! turborepo-ffi
//!
//! Please read the notes about safety (marked with `SAFETY`) in both this file,
//! and in ffi.go before modifying this file.
mod lockfile;
use std::{mem::ManuallyDrop, path::PathBuf};
pub use lockfile::{npm_subgraph, npm_transitive_closure};
mod proto {
include!(concat!(env!("OUT_DIR"), "/_.rs"));
}
#[repr(C)]
#[derive(Debug)]
pub struct Buffer {
len: u32,
data: *mut u8,
}
#[no_mangle]
pub extern "C" fn free_buffer(buffer: Buffer) {
// SAFETY
// it is important that any memory allocated in rust, is freed in rust
// we do this by converting the raw pointer to a Vec and letting it drop
// this is safe because we know that the memory was allocated by rust
// and that the length is correct
let _ = unsafe { Vec::from_raw_parts(buffer.data, buffer.len as usize, buffer.len as usize) };
}
impl<T: prost::Message> From<T> for Buffer {
fn from(value: T) -> Self {
let mut bytes = ManuallyDrop::new(value.encode_to_vec());
let data = bytes.as_mut_ptr();
let len = bytes.len() as u32;
Buffer { len, data }
}
}
impl Buffer {
#[allow(dead_code)]
fn into_proto<T: prost::Message + Default>(self) -> Result<T, prost::DecodeError> {
// SAFETY
// protobuf has a fairly strict schema so overrunning or underrunning the byte
// array will not cause any major issues, that is to say garbage in
// garbage out
let mut slice = unsafe { std::slice::from_raw_parts(self.data, self.len as usize) };
T::decode(&mut slice)
}
}
#[no_mangle]
pub extern "C" fn get_turbo_data_dir() -> Buffer {
// note: this is _not_ recommended, but it the current behaviour go-side
// ideally we should use the platform specific convention
// (which we get from using ProjectDirs::from)
let dirs =
directories::ProjectDirs::from_path("turborepo".into()).expect("user has a home dir");
let dir = dirs.data_dir().to_string_lossy().to_string();
proto::TurboDataDirResp { dir }.into()
}
#[no_mangle]
pub extern "C" fn changed_files(buffer: Buffer) -> Buffer {
let req: proto::ChangedFilesReq = match buffer.into_proto() {
Ok(req) => req,
Err(err) => {
let resp = proto::ChangedFilesResp {
response: Some(proto::changed_files_resp::Response::Error(err.to_string())),
};
return resp.into();
}
};
let response = match turborepo_scm::git::changed_files(
req.git_root.into(),
req.turbo_root.into(),
req.from_commit.as_deref(),
&req.to_commit,
) {
Ok(files) => {
let files: Vec<_> = files.into_iter().collect();
proto::changed_files_resp::Response::Files(proto::ChangedFilesList { files })
}
Err(err) => proto::changed_files_resp::Response::Error(err.to_string()),
};
let resp = proto::ChangedFilesResp {
response: Some(response),
};
resp.into()
}
#[no_mangle]
pub extern "C" fn previous_content(buffer: Buffer) -> Buffer {
let req: proto::PreviousContentReq = match buffer.into_proto() {
Ok(req) => req,
Err(err) => {
let resp = proto::PreviousContentResp {
response: Some(proto::previous_content_resp::Response::Error(
err.to_string(),
)),
};
return resp.into();
}
};
let response = match turborepo_scm::git::previous_content(
req.git_root.into(),
&req.from_commit,
PathBuf::from(req.file_path),
) {
Ok(content) => proto::previous_content_resp::Response::Content(content),
Err(err) => proto::previous_content_resp::Response::Error(err.to_string()),
};
let resp = proto::PreviousContentResp {
response: Some(response),
};
resp.into()
}