refactor(tvix/castore/import): inline process_entry r/7924

This did very little, and especially the part of relying on the outside
caller to pass in a Directory if the type is a directory required having
per-entry-type specific logic anyways.

It's cleaner to just inline it.

Change-Id: I997a8513ee91c67b0a2443cb5cd9e8700f69211e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11414
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: Connor Brewster <cbrewster@hey.com>

1 files changed, 65 insertions, 118 deletions

diff --git a/tvix/castore/src/import.rs b/tvix/castore/src/import.rs
index 976ee98f3bfe..2e1d4c2af33a 100644
--- a/tvix/castore/src/import.rs
+++ b/tvix/castore/src/import.rs
@@ -1,5 +1,4 @@
 use crate::blobservice::BlobService;
-use crate::directoryservice::DirectoryPutter;
 use crate::directoryservice::DirectoryService;
 use crate::proto::node::Node;
 use crate::proto::Directory;
@@ -234,28 +233,71 @@ where
             invariant_checker.see(&entry);
         }
 
-        // FUTUREWORK: handle directory putting here, rather than piping it through process_entry.
-        let node = process_entry(
-            blob_service.clone(),
-            &mut directory_putter,
-            &entry,
-            // process_entry wants an Option<Directory> in case the entry points to a directory.
-            // make sure to provide it.
-            // If the directory has contents, we already have it in
-            // `directories` because we iterate over depth in reverse order (deepest to
-            // shallowest).
-            if entry.file_type().is_dir() {
-                Some(
-                    directories
-                        .remove(entry.path())
-                        // In that case, it contained no children
-                        .unwrap_or_default(),
-                )
-            } else {
-                None
-            },
-        )
-        .await?;
+        let file_type = entry.file_type();
+
+        let node = if file_type.is_dir() {
+            // if the entry was a directory, use the directory_putter to upload the Directory.
+            let directory = directories
+                .remove(entry.path())
+                // In that case, it contained no children
+                .unwrap_or_default();
+
+            let directory_size = directory.size();
+            let directory_digest = directory.digest();
+
+            directory_putter.put(directory).await?;
+
+            Node::Directory(DirectoryNode {
+                name: entry.file_name().as_bytes().to_owned().into(),
+                digest: directory_digest.into(),
+                size: directory_size,
+            })
+        } else if file_type.is_symlink() {
+            let target: bytes::Bytes = std::fs::read_link(entry.path())
+                .map_err(|e| Error::UnableToStat(entry.path().to_path_buf(), e))?
+                .as_os_str()
+                .as_bytes()
+                .to_owned()
+                .into();
+
+            Node::Symlink(SymlinkNode {
+                name: entry.file_name().as_bytes().to_owned().into(),
+                target,
+            })
+        } else if file_type.is_file() {
+            let metadata = entry
+                .metadata()
+                .map_err(|e| Error::UnableToStat(entry.path().to_path_buf(), e.into()))?;
+
+            let mut file = tokio::fs::File::open(entry.path())
+                .await
+                .map_err(|e| Error::UnableToOpen(entry.path().to_path_buf(), e))?;
+
+            let mut writer = blob_service.as_ref().open_write().await;
+
+            if let Err(e) = tokio::io::copy(&mut file, &mut writer).await {
+                return Err(Error::UnableToRead(entry.path().to_path_buf(), e));
+            };
+
+            let digest = writer
+                .close()
+                .await
+                .map_err(|e| Error::UnableToRead(entry.path().to_path_buf(), e))?;
+
+            Node::File(FileNode {
+                name: entry.file_name().as_bytes().to_vec().into(),
+                digest: digest.into(),
+                size: metadata.len(),
+                // If it's executable by the user, it'll become executable.
+                // This matches nix's dump() function behaviour.
+                executable: metadata.permissions().mode() & 64 != 0,
+            })
+        } else {
+            return Err(Error::UnsupportedFileType(
+                entry.path().to_path_buf(),
+                file_type,
+            ));
+        };
 
         if entry.depth() == 0 {
             // Make sure all the directories are flushed.
@@ -282,98 +324,3 @@ where
     // unreachable, we already bailed out before if root doesn't exist.
     unreachable!("Tvix bug: no root node emitted during ingestion")
 }
-
-/// This processes a given [walkdir::DirEntry] and returns a
-/// proto::node::Node, depending on the type of the entry.
-///
-/// If the entry is a file, its contents are uploaded.
-/// If the entry is a directory, the Directory is uploaded as well.
-/// For this to work, it relies on the caller to provide the directory object
-/// with the previously returned (child) nodes.
-///
-/// It assumes to be called only if all children of it have already been processed. If the entry is
-/// indeed a directory, it'll also upload that directory to the store. For this, the
-/// so-far-assembled Directory object for this path needs to be passed in.
-///
-/// It assumes the caller adds returned nodes to the directories it assembles.
-#[instrument(skip_all, fields(entry.file_type=?&entry.file_type(),entry.path=?entry.path()))]
-async fn process_entry<'a, BS>(
-    blob_service: BS,
-    directory_putter: &'a mut Box<dyn DirectoryPutter>,
-    entry: &'a walkdir::DirEntry,
-    maybe_directory: Option<Directory>,
-) -> Result<Node, Error>
-where
-    BS: AsRef<dyn BlobService> + Clone,
-{
-    let file_type = entry.file_type();
-
-    if file_type.is_dir() {
-        let directory = maybe_directory
-            .expect("tvix bug: must be called with some directory in the case of directory");
-        let directory_digest = directory.digest();
-        let directory_size = directory.size();
-
-        // upload this directory
-        directory_putter
-            .put(directory)
-            .await
-            .map_err(|e| Error::UploadDirectoryError(entry.path().to_path_buf(), e))?;
-
-        return Ok(Node::Directory(DirectoryNode {
-            name: entry.file_name().as_bytes().to_owned().into(),
-            digest: directory_digest.into(),
-            size: directory_size,
-        }));
-    }
-
-    if file_type.is_symlink() {
-        let target: bytes::Bytes = std::fs::read_link(entry.path())
-            .map_err(|e| Error::UnableToStat(entry.path().to_path_buf(), e))?
-            .as_os_str()
-            .as_bytes()
-            .to_owned()
-            .into();
-
-        return Ok(Node::Symlink(SymlinkNode {
-            name: entry.file_name().as_bytes().to_owned().into(),
-            target,
-        }));
-    }
-
-    if file_type.is_file() {
-        let metadata = entry
-            .metadata()
-            .map_err(|e| Error::UnableToStat(entry.path().to_path_buf(), e.into()))?;
-
-        let mut file = tokio::fs::File::open(entry.path())
-            .await
-            .map_err(|e| Error::UnableToOpen(entry.path().to_path_buf(), e))?;
-
-        let mut writer = blob_service.as_ref().open_write().await;
-
-        if let Err(e) = tokio::io::copy(&mut file, &mut writer).await {
-            return Err(Error::UnableToRead(entry.path().to_path_buf(), e));
-        };
-
-        let digest = writer
-            .close()
-            .await
-            .map_err(|e| Error::UnableToRead(entry.path().to_path_buf(), e))?;
-
-        return Ok(Node::File(FileNode {
-            name: entry.file_name().as_bytes().to_vec().into(),
-            digest: digest.into(),
-            size: metadata.len(),
-            // If it's executable by the user, it'll become executable.
-            // This matches nix's dump() function behaviour.
-            executable: metadata.permissions().mode() & 64 != 0,
-        }));
-    }
-
-    // Nix says things like: error: file '/home/raito/dev/code.tvl.fyi/tvix/glue/src/tests/import_fixtures/a_devnode' has an unsupported type
-    Err(Error::UnsupportedFileType(
-        entry.path().to_path_buf(),
-        file_type,
-    ))
-}