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|
use super::DirectoryService;
use crate::{proto::NamedNode, B3Digest, Error};
use std::os::unix::ffi::OsStrExt;
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))]
pub async fn descend_to<DS>(
directory_service: DS,
root_node: crate::proto::node::Node,
path: &std::path::Path,
) -> Result<Option<crate::proto::node::Node>, Error>
where
DS: AsRef<dyn DirectoryService>,
{
// strip a possible `/` prefix from the path.
let path = {
if path.starts_with("/") {
path.strip_prefix("/").unwrap()
} else {
path
}
};
let mut cur_node = root_node;
let mut it = path.components();
loop {
match it.next() {
None => {
// the (remaining) path is empty, return the node we're current at.
return Ok(Some(cur_node));
}
Some(first_component) => {
match cur_node {
crate::proto::node::Node::File(_) | crate::proto::node::Node::Symlink(_) => {
// There's still some path left, but the current node is no directory.
// This means the path doesn't exist, as we can't reach it.
return Ok(None);
}
crate::proto::node::Node::Directory(directory_node) => {
let digest: B3Digest = directory_node.digest.try_into().map_err(|_e| {
Error::StorageError("invalid digest length".to_string())
})?;
// fetch the linked node from the directory_service
match directory_service.as_ref().get(&digest).await? {
// If we didn't get the directory node that's linked, that's a store inconsistency, bail out!
None => {
warn!("directory {} does not exist", digest);
return Err(Error::StorageError(format!(
"directory {} does not exist",
digest
)));
}
Some(directory) => {
// look for first_component in the [Directory].
// FUTUREWORK: as the nodes() iterator returns in a sorted fashion, we
// could stop as soon as e.name is larger than the search string.
let child_node = directory.nodes().find(|n| {
n.get_name() == first_component.as_os_str().as_bytes()
});
match child_node {
// child node not found means there's no such element inside the directory.
None => {
return Ok(None);
}
// child node found, return to top-of loop to find the next
// node in the path.
Some(child_node) => {
cur_node = child_node;
}
}
}
}
}
}
}
}
}
}
#[cfg(test)]
mod tests {
use std::path::PathBuf;
use crate::{
directoryservice,
fixtures::{DIRECTORY_COMPLICATED, DIRECTORY_WITH_KEEP},
};
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 =
crate::proto::node::Node::Directory(crate::proto::DirectoryNode {
name: "doesntmatter".into(),
digest: DIRECTORY_COMPLICATED.digest().into(),
size: DIRECTORY_COMPLICATED.size(),
});
// construct the node for DIRECTORY_COMPLICATED
let node_directory_with_keep = crate::proto::node::Node::Directory(
DIRECTORY_COMPLICATED.directories.first().unwrap().clone(),
);
// construct the node for the .keep file
let node_file_keep =
crate::proto::node::Node::File(DIRECTORY_WITH_KEEP.files.first().unwrap().clone());
// traversal to an empty subpath should return the root node.
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
&PathBuf::from(""),
)
.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(),
&PathBuf::from("keep"),
)
.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(),
&PathBuf::from("keep/.keep"),
)
.await
.expect("must succeed");
assert_eq!(Some(node_file_keep.clone()), resp);
}
// traversal to `keep/.keep` should return the node for the .keep file
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
&PathBuf::from("/keep/.keep"),
)
.await
.expect("must succeed");
assert_eq!(Some(node_file_keep), resp);
}
// traversal to `void` should return None (doesn't exist)
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
&PathBuf::from("void"),
)
.await
.expect("must succeed");
assert_eq!(None, resp);
}
// traversal to `void` should return None (doesn't exist)
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
&PathBuf::from("//v/oid"),
)
.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(),
&PathBuf::from("keep/.keep/foo"),
)
.await
.expect("must succeed");
assert_eq!(None, resp);
}
// traversal to a subpath of '/' should return the root node.
{
let resp = descend_to(
&directory_service,
node_directory_complicated.clone(),
&PathBuf::from("/"),
)
.await
.expect("must succeed");
assert_eq!(Some(node_directory_complicated), resp);
}
}
}
|
