use super::PathInfoService;
use crate::{
blobservice::BlobService, directoryservice::DirectoryService, nar::calculate_size_and_sha256,
proto, Error,
};
use prost::Message;
use std::{path::PathBuf, sync::Arc};
use tracing::warn;
/// SledPathInfoService stores PathInfo in a [sled](https://github.com/spacejam/sled).
///
/// The PathInfo messages are stored as encoded protos, and keyed by their output hash,
/// as that's currently the only request type available.
pub struct SledPathInfoService {
db: sled::Db,
blob_service: Arc<dyn BlobService>,
directory_service: Arc<dyn DirectoryService>,
}
impl SledPathInfoService {
pub fn new(
p: PathBuf,
blob_service: Arc<dyn BlobService>,
directory_service: Arc<dyn DirectoryService>,
) -> Result<Self, sled::Error> {
let config = sled::Config::default().use_compression(true).path(p);
let db = config.open()?;
Ok(Self {
db,
blob_service,
directory_service,
})
}
pub fn new_temporary(
blob_service: Arc<dyn BlobService>,
directory_service: Arc<dyn DirectoryService>,
) -> Result<Self, sled::Error> {
let config = sled::Config::default().temporary(true);
let db = config.open()?;
Ok(Self {
db,
blob_service,
directory_service,
})
}
}
impl PathInfoService for SledPathInfoService {
/// Constructs a [SledPathInfoService] from the passed [url::Url]:
/// - scheme has to be `sled://`
/// - there may not be a host.
/// - a path to the sled needs to be provided (which may not be `/`).
fn from_url(
url: &url::Url,
blob_service: Arc<dyn BlobService>,
directory_service: Arc<dyn DirectoryService>,
) -> Result<Self, Error> {
if url.scheme() != "sled" {
return Err(crate::Error::StorageError("invalid scheme".to_string()));
}
if url.has_host() {
return Err(crate::Error::StorageError(format!(
"invalid host: {}",
url.host().unwrap()
)));
}
// TODO: expose compression and other parameters as URL parameters, drop new and new_temporary?
if url.path().is_empty() {
Self::new_temporary(blob_service, directory_service)
.map_err(|e| Error::StorageError(e.to_string()))
} else if url.path() == "/" {
Err(crate::Error::StorageError(
"cowardly refusing to open / with sled".to_string(),
))
} else {
Self::new(url.path().into(), blob_service, directory_service)
.map_err(|e| Error::StorageError(e.to_string()))
}
}
fn get(&self, digest: [u8; 20]) -> Result<Option<proto::PathInfo>, Error> {
match self.db.get(digest) {
Ok(None) => Ok(None),
Ok(Some(data)) => match proto::PathInfo::decode(&*data) {
Ok(path_info) => Ok(Some(path_info)),
Err(e) => {
warn!("failed to decode stored PathInfo: {}", e);
Err(Error::StorageError(format!(
"failed to decode stored PathInfo: {}",
e
)))
}
},
Err(e) => {
warn!("failed to retrieve PathInfo: {}", e);
Err(Error::StorageError(format!(
"failed to retrieve PathInfo: {}",
e
)))
}
}
}
fn put(&self, path_info: proto::PathInfo) -> Result<proto::PathInfo, Error> {
// Call validate on the received PathInfo message.
match path_info.validate() {
Err(e) => Err(Error::InvalidRequest(format!(
"failed to validate PathInfo: {}",
e
))),
// In case the PathInfo is valid, and we were able to extract a NixPath, store it in the database.
// This overwrites existing PathInfo objects.
Ok(nix_path) => match self.db.insert(nix_path.digest, path_info.encode_to_vec()) {
Ok(_) => Ok(path_info),
Err(e) => {
warn!("failed to insert PathInfo: {}", e);
Err(Error::StorageError(format! {
"failed to insert PathInfo: {}", e
}))
}
},
}
}
fn calculate_nar(&self, root_node: &proto::node::Node) -> Result<(u64, [u8; 32]), Error> {
calculate_size_and_sha256(
root_node,
self.blob_service.clone(),
self.directory_service.clone(),
)
.map_err(|e| Error::StorageError(e.to_string()))
}
fn list(&self) -> Box<dyn Iterator<Item = Result<proto::PathInfo, Error>> + Send> {
Box::new(self.db.iter().values().map(|v| match v {
Ok(data) => {
// we retrieved some bytes
match proto::PathInfo::decode(&*data) {
Ok(path_info) => Ok(path_info),
Err(e) => {
warn!("failed to decode stored PathInfo: {}", e);
Err(Error::StorageError(format!(
"failed to decode stored PathInfo: {}",
e
)))
}
}
}
Err(e) => {
warn!("failed to retrieve PathInfo: {}", e);
Err(Error::StorageError(format!(
"failed to retrieve PathInfo: {}",
e
)))
}
}))
}
}
#[cfg(test)]
mod tests {
use tempfile::TempDir;
use crate::tests::utils::gen_blob_service;
use crate::tests::utils::gen_directory_service;
use super::PathInfoService;
use super::SledPathInfoService;
/// This uses a wrong scheme.
#[test]
fn test_invalid_scheme() {
let url = url::Url::parse("http://foo.example/test").expect("must parse");
assert!(
SledPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_err()
);
}
/// This uses the correct scheme, and doesn't specify a path (temporary sled).
#[test]
fn test_valid_scheme_temporary() {
let url = url::Url::parse("sled://").expect("must parse");
assert!(
SledPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_ok()
);
}
/// This sets the path to a location that doesn't exist, which should fail (as sled doesn't mkdir -p)
#[test]
fn test_nonexistent_path() {
let tmpdir = TempDir::new().unwrap();
let mut url = url::Url::parse("sled://foo.example").expect("must parse");
url.set_path(tmpdir.path().join("foo").join("bar").to_str().unwrap());
assert!(
SledPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_err()
);
}
/// This uses the correct scheme, and specifies / as path (which should fail
// for obvious reasons)
#[test]
fn test_invalid_path_root() {
let url = url::Url::parse("sled:///").expect("must parse");
assert!(
SledPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_err()
);
}
/// This uses the correct scheme, and sets a tempdir as location.
#[test]
fn test_valid_scheme_path() {
let tmpdir = TempDir::new().unwrap();
let mut url = url::Url::parse("sled://").expect("must parse");
url.set_path(tmpdir.path().to_str().unwrap());
assert!(
SledPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_ok()
);
}
/// This sets a host, rather than a path, which should fail.
#[test]
fn test_invalid_host() {
let url = url::Url::parse("sled://foo.example").expect("must parse");
assert!(
SledPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_err()
);
}
/// This sets a host AND a valid path, which should fail
#[test]
fn test_invalid_host_and_path() {
let tmpdir = TempDir::new().unwrap();
let mut url = url::Url::parse("sled://foo.example").expect("must parse");
url.set_path(tmpdir.path().to_str().unwrap());
assert!(
SledPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_err()
);
}
}
