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#![allow(clippy::derive_partial_eq_without_eq, non_snake_case)]
use data_encoding::BASE64;
// https://github.com/hyperium/tonic/issues/1056
use nix_compat::store_path::{self, StorePath};
use thiserror::Error;
use tvix_castore::{
proto::{self as castorepb, NamedNode},
B3Digest, B3_LEN,
};
mod grpc_pathinfoservice_wrapper;
pub use grpc_pathinfoservice_wrapper::GRPCPathInfoServiceWrapper;
tonic::include_proto!("tvix.store.v1");
#[cfg(feature = "tonic-reflection")]
/// Compiled file descriptors for implementing [gRPC
/// reflection](https://github.com/grpc/grpc/blob/master/doc/server-reflection.md) with e.g.
/// [`tonic_reflection`](https://docs.rs/tonic-reflection).
pub const FILE_DESCRIPTOR_SET: &[u8] = tonic::include_file_descriptor_set!("tvix.store.v1");
#[cfg(test)]
mod tests;
/// Errors that can occur during the validation of PathInfo messages.
#[derive(Debug, Error, PartialEq)]
pub enum ValidatePathInfoError {
/// Invalid length of a reference
#[error("Invalid length of digest at position {}, expected {}, got {}", .0, store_path::DIGEST_SIZE, .1)]
InvalidReferenceDigestLen(usize, usize),
/// No node present
#[error("No node present")]
NoNodePresent(),
/// Invalid node name encountered.
#[error("Failed to parse {0:?} as StorePath: {1}")]
InvalidNodeName(Vec<u8>, store_path::Error),
/// The digest the (root) node refers to has invalid length.
#[error("Invalid Digest length: expected {}, got {}", B3_LEN, .0)]
InvalidNodeDigestLen(usize),
/// The digest in narinfo.nar_sha256 has an invalid len.
#[error("Invalid narinfo.nar_sha256 length: expected {}, got {}", 32, .0)]
InvalidNarSha256DigestLen(usize),
/// The number of references in the narinfo.reference_names field does not match
/// the number of references in the .references field.
#[error("Inconsistent Number of References: {0} (references) vs {1} (narinfo)")]
InconsistentNumberOfReferences(usize, usize),
/// A string in narinfo.reference_names does not parse to a StorePath.
#[error("Invalid reference_name at position {0}: {1}")]
InvalidNarinfoReferenceName(usize, String),
/// The digest in the parsed `.narinfo.reference_names[i]` does not match
/// the one in `.references[i]`.`
#[error("digest in reference_name at position {} does not match digest in PathInfo, expected {}, got {}", .0, BASE64.encode(.1), BASE64.encode(.2))]
InconsistentNarinfoReferenceNameDigest(
usize,
[u8; store_path::DIGEST_SIZE],
[u8; store_path::DIGEST_SIZE],
),
}
/// Parses a root node name.
///
/// On success, this returns the parsed [StorePath].
/// On error, it returns an error generated from the supplied constructor.
fn parse_node_name_root<E>(
name: &[u8],
err: fn(Vec<u8>, store_path::Error) -> E,
) -> Result<StorePath, E> {
match StorePath::from_bytes(name) {
Ok(np) => Ok(np),
Err(e) => Err(err(name.to_vec(), e)),
}
}
impl PathInfo {
/// validate performs some checks on the PathInfo struct,
/// Returning either a [StorePath] of the root node, or a
/// [ValidatePathInfoError].
pub fn validate(&self) -> Result<StorePath, ValidatePathInfoError> {
// ensure the references have the right number of bytes.
for (i, reference) in self.references.iter().enumerate() {
if reference.len() != store_path::DIGEST_SIZE {
return Err(ValidatePathInfoError::InvalidReferenceDigestLen(
i,
reference.len(),
));
}
}
// If there is a narinfo field populated…
if let Some(narinfo) = &self.narinfo {
// ensure the nar_sha256 digest has the correct length.
if narinfo.nar_sha256.len() != 32 {
return Err(ValidatePathInfoError::InvalidNarSha256DigestLen(
narinfo.nar_sha256.len(),
));
}
// ensure the number of references there matches PathInfo.references count.
if narinfo.reference_names.len() != self.references.len() {
return Err(ValidatePathInfoError::InconsistentNumberOfReferences(
self.references.len(),
narinfo.reference_names.len(),
));
}
// parse references in reference_names.
for (i, reference_name_str) in narinfo.reference_names.iter().enumerate() {
// ensure thy parse as (non-absolute) store path
let reference_names_store_path =
StorePath::from_bytes(reference_name_str.as_bytes()).map_err(|_| {
ValidatePathInfoError::InvalidNarinfoReferenceName(
i,
reference_name_str.to_owned(),
)
})?;
// ensure their digest matches the one at self.references[i].
{
// This is safe, because we ensured the proper length earlier already.
let reference_digest = self.references[i].to_vec().try_into().unwrap();
if reference_names_store_path.digest != reference_digest {
return Err(
ValidatePathInfoError::InconsistentNarinfoReferenceNameDigest(
i,
reference_digest,
reference_names_store_path.digest,
),
);
}
}
}
}
// Ensure there is a (root) node present, and it properly parses to a [StorePath].
let root_nix_path = match &self.node {
None => {
return Err(ValidatePathInfoError::NoNodePresent());
}
Some(castorepb::Node { node }) => match node {
None => {
return Err(ValidatePathInfoError::NoNodePresent());
}
Some(node) => {
match node {
// for a directory root node, ensure the digest has the appropriate size.
castorepb::node::Node::Directory(directory_node) => {
if TryInto::<B3Digest>::try_into(directory_node.digest.clone()).is_err()
{
return Err(ValidatePathInfoError::InvalidNodeDigestLen(
directory_node.digest.len(),
));
}
}
// for a file root node, ensure the digest has the appropriate size.
castorepb::node::Node::File(file_node) => {
// ensure the digest has the appropriate size.
if TryInto::<B3Digest>::try_into(file_node.digest.clone()).is_err() {
return Err(ValidatePathInfoError::InvalidNodeDigestLen(
file_node.digest.len(),
));
}
}
// nothing to do specifically for symlinks
castorepb::node::Node::Symlink(_) => {}
}
// parse the name of the node itself and return
parse_node_name_root(node.get_name(), ValidatePathInfoError::InvalidNodeName)?
}
},
};
// return the root nix path
Ok(root_nix_path)
}
}
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