#![allow(clippy::derive_partial_eq_without_eq, non_snake_case)]
// https://github.com/hyperium/tonic/issues/1056
use bstr::ByteSlice;
use std::{collections::HashSet, iter::Peekable};
use prost::Message;
mod grpc_blobservice_wrapper;
mod grpc_directoryservice_wrapper;
pub use grpc_blobservice_wrapper::GRPCBlobServiceWrapper;
pub use grpc_directoryservice_wrapper::GRPCDirectoryServiceWrapper;
use crate::{B3Digest, B3_LEN};
tonic::include_proto!("tvix.castore.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.castore.v1");
#[cfg(test)]
mod tests;
/// Errors that can occur during the validation of Directory messages.
#[derive(Debug, PartialEq, Eq, thiserror::Error)]
pub enum ValidateDirectoryError {
/// Elements are not in sorted order
#[error("{:?} is not sorted", .0.as_bstr())]
WrongSorting(Vec<u8>),
/// Multiple elements with the same name encountered
#[error("{:?} is a duplicate name", .0.as_bstr())]
DuplicateName(Vec<u8>),
/// Invalid node
#[error("invalid node with name {:?}: {:?}", .0.as_bstr(), .1.to_string())]
InvalidNode(Vec<u8>, ValidateNodeError),
#[error("Total size exceeds u32::MAX")]
SizeOverflow,
}
/// Errors that occur during Node validation
#[derive(Debug, PartialEq, Eq, thiserror::Error)]
pub enum ValidateNodeError {
/// Invalid digest length encountered
#[error("Invalid Digest length: {0}")]
InvalidDigestLen(usize),
/// Invalid name encountered
#[error("Invalid name")]
InvalidName(),
/// Invalid symlink target
#[error("Invalid symlink target: {}", .0.as_bstr())]
InvalidSymlinkTarget(Vec<u8>),
}
/// Checks a Node name for validity as an intermediate node.
/// We disallow slashes, null bytes, '.', '..' and the empty string.
fn validate_node_name(name: &[u8]) -> Result<(), ValidateNodeError> {
if name.is_empty()
|| name == b".."
|| name == b"."
|| name.contains(&0x00)
|| name.contains(&b'/')
{
Err(ValidateNodeError::InvalidName())?;
}
Ok(())
}
/// NamedNode is implemented for [FileNode], [DirectoryNode] and [SymlinkNode]
/// and [node::Node], so we can ask all of them for the name easily.
pub trait NamedNode {
fn get_name(&self) -> &[u8];
}
impl NamedNode for &FileNode {
fn get_name(&self) -> &[u8] {
&self.name
}
}
impl NamedNode for &DirectoryNode {
fn get_name(&self) -> &[u8] {
&self.name
}
}
impl NamedNode for &SymlinkNode {
fn get_name(&self) -> &[u8] {
&self.name
}
}
impl NamedNode for node::Node {
fn get_name(&self) -> &[u8] {
match self {
node::Node::File(node_file) => &node_file.name,
node::Node::Directory(node_directory) => &node_directory.name,
node::Node::Symlink(node_symlink) => &node_symlink.name,
}
}
}
impl node::Node {
/// Returns the node with a new name.
pub fn rename(self, name: bytes::Bytes) -> Self {
match self {
node::Node::Directory(n) => node::Node::Directory(DirectoryNode { name, ..n }),
node::Node::File(n) => node::Node::File(FileNode { name, ..n }),
node::Node::Symlink(n) => node::Node::Symlink(SymlinkNode { name, ..n }),
}
}
/// Ensures the node has a valid name, and checks the type-specific fields too.
pub fn validate(&self) -> Result<(), ValidateNodeError> {
match self {
// for a directory root node, ensure the digest has the appropriate size.
node::Node::Directory(directory_node) => {
if directory_node.digest.len() != B3_LEN {
Err(ValidateNodeError::InvalidDigestLen(
directory_node.digest.len(),
))?;
}
validate_node_name(&directory_node.name)?;
}
// for a file root node, ensure the digest has the appropriate size.
node::Node::File(file_node) => {
if file_node.digest.len() != B3_LEN {
Err(ValidateNodeError::InvalidDigestLen(file_node.digest.len()))?;
}
validate_node_name(&file_node.name)?;
}
// ensure the symlink target is not empty and doesn't contain null bytes.
node::Node::Symlink(symlink_node) => {
if symlink_node.target.is_empty() || symlink_node.target.contains(&b'\0') {
Err(ValidateNodeError::InvalidSymlinkTarget(
symlink_node.target.to_vec(),
))?;
}
validate_node_name(&symlink_node.name)?;
}
}
Ok(())
}
}
/// Accepts a name, and a mutable reference to the previous name.
/// If the passed name is larger than the previous one, the reference is updated.
/// If it's not, an error is returned.
fn update_if_lt_prev<'n>(
prev_name: &mut &'n [u8],
name: &'n [u8],
) -> Result<(), ValidateDirectoryError> {
if *name < **prev_name {
return Err(ValidateDirectoryError::WrongSorting(name.to_vec()));
}
*prev_name = name;
Ok(())
}
/// Inserts the given name into a HashSet if it's not already in there.
/// If it is, an error is returned.
fn insert_once<'n>(
seen_names: &mut HashSet<&'n [u8]>,
name: &'n [u8],
) -> Result<(), ValidateDirectoryError> {
if seen_names.get(name).is_some() {
return Err(ValidateDirectoryError::DuplicateName(name.to_vec()));
}
seen_names.insert(name);
Ok(())
}
fn checked_sum(iter: impl IntoIterator<Item = u32>) -> Option<u32> {
iter.into_iter().try_fold(0u32, |acc, i| acc.checked_add(i))
}
impl Directory {
/// The size of a directory is the number of all regular and symlink elements,
/// the number of directory elements, and their size fields.
pub fn size(&self) -> u32 {
if cfg!(debug_assertions) {
self.size_checked()
.expect("Directory::size exceeds u32::MAX")
} else {
self.size_checked().unwrap_or(u32::MAX)
}
}
fn size_checked(&self) -> Option<u32> {
checked_sum([
self.files.len().try_into().ok()?,
self.symlinks.len().try_into().ok()?,
self.directories.len().try_into().ok()?,
checked_sum(self.directories.iter().map(|e| e.size))?,
])
}
/// Calculates the digest of a Directory, which is the blake3 hash of a
/// Directory protobuf message, serialized in protobuf canonical form.
pub fn digest(&self) -> B3Digest {
let mut hasher = blake3::Hasher::new();
hasher
.update(&self.encode_to_vec())
.finalize()
.as_bytes()
.into()
}
/// validate checks the directory for invalid data, such as:
/// - violations of name restrictions
/// - invalid digest lengths
/// - not properly sorted lists
/// - duplicate names in the three lists
pub fn validate(&self) -> Result<(), ValidateDirectoryError> {
let mut seen_names: HashSet<&[u8]> = HashSet::new();
let mut last_directory_name: &[u8] = b"";
let mut last_file_name: &[u8] = b"";
let mut last_symlink_name: &[u8] = b"";
// check directories
for directory_node in &self.directories {
node::Node::Directory(directory_node.clone())
.validate()
.map_err(|e| {
ValidateDirectoryError::InvalidNode(directory_node.name.to_vec(), e)
})?;
update_if_lt_prev(&mut last_directory_name, &directory_node.name)?;
insert_once(&mut seen_names, &directory_node.name)?;
}
// check files
for file_node in &self.files {
node::Node::File(file_node.clone())
.validate()
.map_err(|e| ValidateDirectoryError::InvalidNode(file_node.name.to_vec(), e))?;
update_if_lt_prev(&mut last_file_name, &file_node.name)?;
insert_once(&mut seen_names, &file_node.name)?;
}
// check symlinks
for symlink_node in &self.symlinks {
node::Node::Symlink(symlink_node.clone())
.validate()
.map_err(|e| ValidateDirectoryError::InvalidNode(symlink_node.name.to_vec(), e))?;
update_if_lt_prev(&mut last_symlink_name, &symlink_node.name)?;
insert_once(&mut seen_names, &symlink_node.name)?;
}
self.size_checked()
.ok_or(ValidateDirectoryError::SizeOverflow)?;
Ok(())
}
/// Allows iterating over all three nodes ([DirectoryNode], [FileNode],
/// [SymlinkNode]) in an ordered fashion, as long as the individual lists
/// are sorted (which can be checked by the [Directory::validate]).
pub fn nodes(&self) -> DirectoryNodesIterator {
return DirectoryNodesIterator {
i_directories: self.directories.iter().peekable(),
i_files: self.files.iter().peekable(),
i_symlinks: self.symlinks.iter().peekable(),
};
}
}
/// Struct to hold the state of an iterator over all nodes of a Directory.
///
/// Internally, this keeps peekable Iterators over all three lists of a
/// Directory message.
pub struct DirectoryNodesIterator<'a> {
// directory: &Directory,
i_directories: Peekable<std::slice::Iter<'a, DirectoryNode>>,
i_files: Peekable<std::slice::Iter<'a, FileNode>>,
i_symlinks: Peekable<std::slice::Iter<'a, SymlinkNode>>,
}
/// looks at two elements implementing NamedNode, and returns true if "left
/// is smaller / comes first".
///
/// Some(_) is preferred over None.
fn left_name_lt_right<A: NamedNode, B: NamedNode>(left: Option<&A>, right: Option<&B>) -> bool {
match left {
// if left is None, right always wins
None => false,
Some(left_inner) => {
// left is Some.
match right {
// left is Some, right is None - left wins.
None => true,
Some(right_inner) => {
// both are Some - compare the name.
return left_inner.get_name() < right_inner.get_name();
}
}
}
}
}
impl Iterator for DirectoryNodesIterator<'_> {
type Item = node::Node;
// next returns the next node in the Directory.
// we peek at all three internal iterators, and pick the one with the
// smallest name, to ensure lexicographical ordering.
// The individual lists are already known to be sorted.
fn next(&mut self) -> Option<Self::Item> {
if left_name_lt_right(self.i_directories.peek(), self.i_files.peek()) {
// i_directories is still in the game, compare with symlinks
if left_name_lt_right(self.i_directories.peek(), self.i_symlinks.peek()) {
self.i_directories
.next()
.cloned()
.map(node::Node::Directory)
} else {
self.i_symlinks.next().cloned().map(node::Node::Symlink)
}
} else {
// i_files is still in the game, compare with symlinks
if left_name_lt_right(self.i_files.peek(), self.i_symlinks.peek()) {
self.i_files.next().cloned().map(node::Node::File)
} else {
self.i_symlinks.next().cloned().map(node::Node::Symlink)
}
}
}
}
