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use crate::{directoryservice::DirectoryService, Error, Node, Path};
use tracing::{instrument, warn};
/// This descends from a (root) node to the given (sub)path, returning the Node
/// at that path, or none, if there's nothing at that path.
#[instrument(skip(directory_service, path), fields(%path))]
pub async fn descend_to<DS>(
directory_service: DS,
root_node: Node,
path: impl AsRef<Path> + std::fmt::Display,
) -> Result<Option<Node>, Error>
where
DS: AsRef<dyn DirectoryService>,
{
let mut parent_node = root_node;
for component in path.as_ref().components_bytes() {
match parent_node {
Node::File { .. } | Node::Symlink { .. } => {
// There's still some path left, but the parent node is no directory.
// This means the path doesn't exist, as we can't reach it.
return Ok(None);
}
Node::Directory { digest, .. } => {
// fetch the linked node from the directory_service.
let directory =
directory_service
.as_ref()
.get(&digest)
.await?
.ok_or_else(|| {
// If we didn't get the directory node that's linked, that's a store inconsistency, bail out!
warn!("directory {} does not exist", digest);
Error::StorageError(format!("directory {} does not exist", digest))
})?;
// look for the component in the [Directory].
if let Some((_child_name, child_node)) = directory
.into_nodes()
.find(|(name, _node)| name.as_ref() == component)
{
// child node found, update prev_node to that and continue.
parent_node = child_node.clone();
} else {
// child node not found means there's no such element inside the directory.
return Ok(None);
};
}
}
}
// We traversed the entire path, so this must be the node.
Ok(Some(parent_node))
}
#[cfg(test)]
mod tests {
use crate::{
directoryservice,
fixtures::{DIRECTORY_COMPLICATED, DIRECTORY_WITH_KEEP, EMPTY_BLOB_DIGEST},
Node, PathBuf,
};
use super::descend_to;
#[tokio::test]
async fn test_descend_to() {
let directory_service = directoryservice::from_addr("memory://").await.unwrap();
let mut handle = directory_service.put_multiple_start();
handle
.put(DIRECTORY_WITH_KEEP.clone())
.await
.expect("must succeed");
handle
.put(DIRECTORY_COMPLICATED.clone())
.await
.expect("must succeed");
handle.close().await.expect("must upload");
// construct the node for DIRECTORY_COMPLICATED
let node_directory_complicated = Node::Directory {
digest: DIRECTORY_COMPLICATED.digest(),
size: DIRECTORY_COMPLICATED.size(),
};
// construct the node for DIRECTORY_COMPLICATED
let node_directory_with_keep = Node::Directory {
digest: DIRECTORY_WITH_KEEP.digest(),
size: DIRECTORY_WITH_KEEP.size(),
};
// construct the node for the .keep file
let node_file_keep = Node::File {
digest: EMPTY_BLOB_DIGEST.clone(),
size: 0,
executable: false,
};
// traversal to an empty subpath should return the root node.
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
"".parse::<PathBuf>().unwrap(),
)
.await
.expect("must succeed");
assert_eq!(Some(node_directory_complicated.clone()), resp);
}
// traversal to `keep` should return the node for DIRECTORY_WITH_KEEP
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
"keep".parse::<PathBuf>().unwrap(),
)
.await
.expect("must succeed");
assert_eq!(Some(node_directory_with_keep), resp);
}
// traversal to `keep/.keep` should return the node for the .keep file
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
"keep/.keep".parse::<PathBuf>().unwrap(),
)
.await
.expect("must succeed");
assert_eq!(Some(node_file_keep.clone()), resp);
}
// traversal to `void` should return None (doesn't exist)
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
"void".parse::<PathBuf>().unwrap(),
)
.await
.expect("must succeed");
assert_eq!(None, resp);
}
// traversal to `v/oid` should return None (doesn't exist)
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
"v/oid".parse::<PathBuf>().unwrap(),
)
.await
.expect("must succeed");
assert_eq!(None, resp);
}
// traversal to `keep/.keep/404` should return None (the path can't be
// reached, as keep/.keep already is a file)
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
"keep/.keep/foo".parse::<PathBuf>().unwrap(),
)
.await
.expect("must succeed");
assert_eq!(None, resp);
}
}
}
|
