refactor(tvix/castore): ingest filesystem entries in parallel r/7987

Rather than carrying around an Future in the IngestionEntry::Regular,
simply carry the plain B3Digest.

Code reading through a non-seekable data stream has no choice but to
read and upload blobs immediately, and code seeking through something
seekable (like a filesystem) probably knows better what concurrency to
pick when ingesting, rather than the consuming side.

(Our only) one of these seekable source implementations is now doing
exactly that. We produce a stream of futures, and then use
[StreamExt::buffered] to process more than one, concurrently.

We still keep the same order, to avoid shuffling things and violating
the stream order.

This also cleans up walk_path_for_ingestion in castore/import, as well
as ingest_dir_entries in glue/tvix_store_io.

Change-Id: I5eb70f3e1e372c74bcbfcf6b6e2653eba36e151d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11491
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI

1 files changed, 9 insertions, 4 deletions

diff --git a/tvix/glue/src/builtins/import.rs b/tvix/glue/src/builtins/import.rs
index df3d217869..6814781df3 100644
--- a/tvix/glue/src/builtins/import.rs
+++ b/tvix/glue/src/builtins/import.rs
@@ -2,6 +2,7 @@
 
 use crate::builtins::errors::ImportError;
 use std::path::Path;
+use tvix_castore::import::ingest_entries;
 use tvix_eval::{
     builtin_macros::builtins,
     generators::{self, GenCo},
@@ -84,15 +85,19 @@ async fn filtered_ingest(
         entries.push(entry);
     }
 
-    let entries_iter = entries.into_iter().rev().map(Ok);
+    let dir_entries = entries.into_iter().rev().map(Ok);
 
     state.tokio_handle.block_on(async {
-        state
-            .ingest_dir_entries(entries_iter, path)
+        let entries = tvix_castore::import::fs::dir_entries_to_ingestion_stream(
+            &state.blob_service,
+            dir_entries,
+            path,
+        );
+        ingest_entries(&state.directory_service, entries)
             .await
             .map_err(|err| ErrorKind::IO {
                 path: Some(path.to_path_buf()),
-                error: err.into(),
+                error: Rc::new(err.into()),
             })
     })
 }