refactor(tvix/castore): break down ingest_path
In one function that does the heavy lifting: `ingest_entries`, and three additional helpers: - `walk_path_for_ingestion` which perform the tree walking in a very naive way and can be replaced by the user - `leveled_entries_to_stream` which transforms a list of a list of entries ordered by their depth in the tree to a stream of entries in the bottom to top order (Merkle-compatible order I will say in the future). - `ingest_path` which calls the previous functions. Change-Id: I724b972d3c5bffc033f03363255eae448f017cef Reviewed-on: https://cl.tvl.fyi/c/depot/+/10573 Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de> Autosubmit: raitobezarius <tvl@lahfa.xyz>
This commit is contained in:
Ryan Lahfa
clbot
parent
1f1a42b4da
commit
7275288f0e
1 changed files with 185 additions and 68 deletions
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@ -7,6 +7,9 @@ use crate::proto::DirectoryNode;
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use crate::proto::FileNode;
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use crate::proto::SymlinkNode;
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use crate::Error as CastoreError;
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use async_stream::stream;
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use futures::pin_mut;
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use futures::Stream;
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use std::os::unix::ffi::OsStrExt;
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use std::{
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collections::HashMap,
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@ -14,10 +17,14 @@ use std::{
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os::unix::prelude::PermissionsExt,
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path::{Path, PathBuf},
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};
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use tokio_stream::StreamExt;
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use tracing::instrument;
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use walkdir::DirEntry;
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use walkdir::WalkDir;
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#[cfg(debug_assertions)]
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use std::collections::HashSet;
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#[derive(Debug, thiserror::Error)]
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pub enum Error {
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#[error("failed to upload directory at {0}: {1}")]
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@ -141,34 +148,24 @@ where
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todo!("handle other types")
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}
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/// Ingests the contents at the given path into the tvix store,
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/// interacting with a [BlobService] and [DirectoryService].
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/// It returns the root node or an error.
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/// Walk the filesystem at a given path and returns a level-keyed list of directory entries.
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///
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/// It does not follow symlinks at the root, they will be ingested as actual
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/// symlinks.
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/// This is how [`ingest_path`] assembles the set of entries to pass on [`ingest_entries`].
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/// This low-level function can be used if additional filtering or processing is required on the
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/// entries.
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///
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/// It's not interacting with a PathInfoService (from tvix-store), or anything
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/// else giving it a "non-content-addressed name".
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/// It's up to the caller to possibly register it somewhere (and potentially
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/// rename it based on some naming scheme)
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#[instrument(skip(blob_service, directory_service), fields(path=?p), err)]
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pub async fn ingest_path<'a, BS, DS, P>(
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blob_service: BS,
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directory_service: DS,
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p: P,
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) -> Result<Node, Error>
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/// Level here is in the context of graph theory, e.g. 2-level nodes
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/// are nodes that are at depth 2.
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///
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/// This function will walk the filesystem using `walkdir` and will consume
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/// `O(#number of entries)` space.
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#[instrument(fields(path), err)]
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pub fn walk_path_for_ingestion<P>(path: P) -> Result<Vec<Vec<DirEntry>>, Error>
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where
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P: AsRef<Path> + Debug,
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BS: AsRef<dyn BlobService> + Clone,
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DS: AsRef<dyn DirectoryService>,
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P: AsRef<Path> + std::fmt::Debug,
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{
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let mut directories: HashMap<PathBuf, Directory> = HashMap::default();
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let mut directory_putter = directory_service.as_ref().put_multiple_start();
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let mut entries_per_depths: Vec<Vec<DirEntry>> = vec![Vec::new()];
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for entry in WalkDir::new(p.as_ref())
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for entry in WalkDir::new(path.as_ref())
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.follow_links(false)
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.follow_root_links(false)
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.contents_first(false)
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@ -178,7 +175,7 @@ where
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// Entry could be a NotFound, if the root path specified does not exist.
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let entry = entry.map_err(|e| {
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Error::UnableToOpen(
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PathBuf::from(p.as_ref()),
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PathBuf::from(path.as_ref()),
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e.into_io_error().expect("walkdir err must be some"),
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)
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})?;
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@ -197,14 +194,135 @@ where
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}
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}
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debug_assert!(!entries_per_depths[0].is_empty(), "No root node available!");
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Ok(entries_per_depths)
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}
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/// Convert a leveled-key vector of filesystem entries into a stream of
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/// [DirEntry] in a way that honors the Merkle invariant, i.e. from bottom to top.
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pub fn leveled_entries_to_stream(
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entries_per_depths: Vec<Vec<DirEntry>>,
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) -> impl Stream<Item = DirEntry> {
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stream! {
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for level in entries_per_depths.into_iter().rev() {
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for entry in level.into_iter() {
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yield entry;
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}
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}
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}
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}
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/// Ingests the contents at a given path into the tvix store, interacting with a [BlobService] and
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/// [DirectoryService]. It returns the root node or an error.
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///
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/// It does not follow symlinks at the root, they will be ingested as actual symlinks.
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#[instrument(skip(blob_service, directory_service), fields(path), err)]
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pub async fn ingest_path<'a, BS, DS, P>(
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blob_service: BS,
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directory_service: DS,
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path: P,
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) -> Result<Node, Error>
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where
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P: AsRef<Path> + std::fmt::Debug,
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BS: AsRef<dyn BlobService> + Clone,
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DS: AsRef<dyn DirectoryService>,
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{
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let entries = walk_path_for_ingestion(path)?;
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let entries_stream = leveled_entries_to_stream(entries);
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pin_mut!(entries_stream);
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ingest_entries(blob_service, directory_service, entries_stream).await
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}
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/// The Merkle invariant checker is an internal structure to perform bookkeeping of all directory
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/// entries we are ingesting and verifying we are ingesting them in the right order.
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///
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/// That is, whenever we process an entry `L`, we would like to verify if we didn't process earlier
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/// an entry `P` such that `P` is an **ancestor** of `L`.
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///
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/// If such a thing happened, it means that we have processed something like:
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///
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///```no_trust
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/// A
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/// / \
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/// B C
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/// / \ \
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/// G F P <--------- processed before this one
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/// / \ |
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/// D E |
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/// \ |
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/// L <-----------------------------+
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/// ```
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///
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/// This is exactly what must never happen.
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///
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/// Note: this checker is local, it can only see what happens on our side, not on the remote side,
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/// i.e. the different remote services.
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#[derive(Default)]
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#[cfg(debug_assertions)]
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struct MerkleInvariantChecker {
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seen: HashSet<PathBuf>,
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}
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#[cfg(debug_assertions)]
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impl MerkleInvariantChecker {
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/// See a directory entry and remember it.
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fn see(&mut self, node: &DirEntry) {
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self.seen.insert(node.path().to_owned());
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}
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/// Returns a potential ancestor already seen for that directory entry.
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fn find_ancestor(&self, node: &DirEntry) -> Option<PathBuf> {
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for anc in node.path().ancestors() {
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if self.seen.contains(anc) {
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return Some(anc.to_owned());
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}
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}
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None
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}
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}
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/// Ingests elements from the given stream of [`DirEntry`] into a the passed [`BlobService`] and
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/// [`DirectoryService`].
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/// It does not follow symlinks at the root, they will be ingested as actual symlinks.
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#[instrument(skip_all, ret, err)]
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pub async fn ingest_entries<'a, BS, DS, S>(
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blob_service: BS,
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directory_service: DS,
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mut entries_async_iterator: S,
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) -> Result<Node, Error>
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where
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BS: AsRef<dyn BlobService> + Clone,
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DS: AsRef<dyn DirectoryService>,
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S: Stream<Item = DirEntry> + std::marker::Unpin,
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{
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let mut directories: HashMap<PathBuf, Directory> = HashMap::default();
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let mut directory_putter = directory_service.as_ref().put_multiple_start();
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#[cfg(debug_assertions)]
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let mut invariant_checker: MerkleInvariantChecker = Default::default();
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// We need to process a directory's children before processing
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// the directory itself in order to have all the data needed
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// to compute the hash.
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for level in entries_per_depths.into_iter().rev() {
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for entry in level.into_iter() {
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// FUTUREWORK: inline `process_entry`
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while let Some(entry) = entries_async_iterator.next().await {
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#[cfg(debug_assertions)]
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{
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// If we find an ancestor before we see this entry, this means that the caller
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// broke the contract, refer to the documentation of the invariant checker to
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// understand the reasoning here.
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if let Some(ancestor) = invariant_checker.find_ancestor(&entry) {
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panic!("Tvix bug: merkle invariant checker discovered that {} was processed before {}!",
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ancestor.display(),
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entry.path().display()
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);
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}
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invariant_checker.see(&entry);
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}
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// FUTUREWORK: handle directory putting here, rather than piping it through process_entry.
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let node = process_entry(
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blob_service.clone(),
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&mut directory_putter,
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@ -249,7 +367,6 @@ where
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}
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}
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}
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}
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// unreachable, we already bailed out before if root doesn't exist.
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unreachable!()
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unreachable!("Tvix bug: no root node emitted during ingestion")
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}
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