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use axum::http::StatusCode;
use bytes::Bytes;
use nix_compat::{narinfo::NarInfo, nixbase32};
use prost::Message;
use tracing::{instrument, warn, Span};
use tvix_castore::proto::{self as castorepb};
use tvix_store::proto::PathInfo;
use crate::AppState;
/// The size limit for NARInfo uploads nar-bridge receives
const NARINFO_LIMIT: usize = 2 * 1024 * 1024;
#[instrument(skip(path_info_service))]
pub async fn head(
axum::extract::Path(narinfo_str): axum::extract::Path<String>,
axum::extract::State(AppState {
path_info_service, ..
}): axum::extract::State<AppState>,
) -> Result<&'static str, StatusCode> {
let digest = parse_narinfo_str(&narinfo_str)?;
Span::current().record("path_info.digest", &narinfo_str[0..32]);
if path_info_service
.get(digest)
.await
.map_err(|e| {
warn!(err=%e, "failed to get PathInfo");
StatusCode::INTERNAL_SERVER_ERROR
})?
.is_some()
{
Ok("")
} else {
warn!("PathInfo not found");
Err(StatusCode::NOT_FOUND)
}
}
#[instrument(skip(path_info_service))]
pub async fn get(
axum::extract::Path(narinfo_str): axum::extract::Path<String>,
axum::extract::State(AppState {
path_info_service, ..
}): axum::extract::State<AppState>,
) -> Result<String, StatusCode> {
let digest = parse_narinfo_str(&narinfo_str)?;
Span::current().record("path_info.digest", &narinfo_str[0..32]);
// fetch the PathInfo
let path_info = path_info_service
.get(digest)
.await
.map_err(|e| {
warn!(err=%e, "failed to get PathInfo");
StatusCode::INTERNAL_SERVER_ERROR
})?
.ok_or(StatusCode::NOT_FOUND)?;
let store_path = path_info.validate().map_err(|e| {
warn!(err=%e, "invalid PathInfo");
StatusCode::INTERNAL_SERVER_ERROR
})?;
let mut narinfo = path_info.to_narinfo(store_path.as_ref()).ok_or_else(|| {
warn!(path_info=?path_info, "PathInfo contained no NAR data");
StatusCode::INTERNAL_SERVER_ERROR
})?;
// encode the (unnamed) root node in the NAR url itself.
// We strip the name from the proto node before sending it out.
// It's not needed to render the NAR, it'll make the URL shorter, and it
// will make caching these requests easier.
let (_, root_node) = path_info
.node
.as_ref()
.expect("invalid pathinfo")
.to_owned()
.into_name_and_node()
.expect("invalid pathinfo");
let url = format!(
"nar/tvix-castore/{}?narsize={}",
data_encoding::BASE64URL_NOPAD
.encode(&castorepb::Node::from_name_and_node("".into(), root_node).encode_to_vec()),
narinfo.nar_size,
);
narinfo.url = &url;
Ok(narinfo.to_string())
}
#[instrument(skip(path_info_service, root_nodes, request))]
pub async fn put(
axum::extract::Path(narinfo_str): axum::extract::Path<String>,
axum::extract::State(AppState {
path_info_service,
root_nodes,
..
}): axum::extract::State<AppState>,
request: axum::extract::Request,
) -> Result<&'static str, StatusCode> {
let _narinfo_digest = parse_narinfo_str(&narinfo_str)?;
Span::current().record("path_info.digest", &narinfo_str[0..32]);
let narinfo_bytes: Bytes = axum::body::to_bytes(request.into_body(), NARINFO_LIMIT)
.await
.map_err(|e| {
warn!(err=%e, "unable to fetch body");
StatusCode::BAD_REQUEST
})?;
// Parse the narinfo from the body.
let narinfo_str = std::str::from_utf8(narinfo_bytes.as_ref()).map_err(|e| {
warn!(err=%e, "unable decode body as string");
StatusCode::BAD_REQUEST
})?;
let narinfo = NarInfo::parse(narinfo_str).map_err(|e| {
warn!(err=%e, "unable to parse narinfo");
StatusCode::BAD_REQUEST
})?;
// Extract the NARHash from the PathInfo.
Span::current().record("path_info.nar_info", nixbase32::encode(&narinfo.nar_hash));
// populate the pathinfo.
let mut pathinfo = PathInfo::from(&narinfo);
// Lookup root node with peek, as we don't want to update the LRU list.
// We need to be careful to not hold the RwLock across the await point.
let maybe_root_node: Option<tvix_castore::Node> =
root_nodes.read().peek(&narinfo.nar_hash).cloned();
match maybe_root_node {
Some(root_node) => {
// Set the root node from the lookup.
// We need to rename the node to the narinfo storepath basename, as
// that's where it's stored in PathInfo.
pathinfo.node = Some(castorepb::Node::from_name_and_node(
narinfo.store_path.to_string().into(),
root_node,
));
// Persist the PathInfo.
path_info_service.put(pathinfo).await.map_err(|e| {
warn!(err=%e, "failed to persist the PathInfo");
StatusCode::INTERNAL_SERVER_ERROR
})?;
Ok("")
}
None => {
warn!("received narinfo with unknown NARHash");
Err(StatusCode::BAD_REQUEST)
}
}
}
/// Parses a `3mzh8lvgbynm9daj7c82k2sfsfhrsfsy.narinfo` string and returns the
/// nixbase32-decoded digest.
fn parse_narinfo_str(s: &str) -> Result<[u8; 20], StatusCode> {
if !s.is_char_boundary(32) {
warn!("invalid string, no char boundary at 32");
return Err(StatusCode::NOT_FOUND);
}
Ok(match s.split_at(32) {
(hash_str, ".narinfo") => {
// we know this is 32 bytes
let hash_str_fixed: [u8; 32] = hash_str.as_bytes().try_into().unwrap();
nixbase32::decode_fixed(hash_str_fixed).map_err(|e| {
warn!(err=%e, "invalid digest");
StatusCode::NOT_FOUND
})?
}
_ => {
warn!("invalid string");
return Err(StatusCode::NOT_FOUND);
}
})
}
#[cfg(test)]
mod test {
use super::parse_narinfo_str;
use hex_literal::hex;
#[test]
fn success() {
assert_eq!(
hex!("8a12321522fd91efbd60ebb2481af88580f61600"),
parse_narinfo_str("00bgd045z0d4icpbc2yyz4gx48ak44la.narinfo").unwrap()
);
}
#[test]
fn failure() {
assert!(parse_narinfo_str("00bgd045z0d4icpbc2yyz4gx48ak44la").is_err());
assert!(parse_narinfo_str("/00bgd045z0d4icpbc2yyz4gx48ak44la").is_err());
assert!(parse_narinfo_str("000000").is_err());
assert!(parse_narinfo_str("00bgd045z0d4icpbc2yyz4gx48ak44l🦊.narinfo").is_err());
}
}
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