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|
use super::PathInfoService;
use crate::{
blobservice::BlobService, directoryservice::DirectoryService, nar::calculate_size_and_sha256,
proto, Error,
};
use prost::Message;
use std::path::PathBuf;
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<DS: DirectoryService> {
db: sled::Db,
blob_service: Box<dyn BlobService>,
directory_service: DS,
}
impl<DS: DirectoryService> SledPathInfoService<DS> {
pub fn new(
p: PathBuf,
blob_service: Box<dyn BlobService>,
directory_service: DS,
) -> 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: Box<dyn BlobService>,
directory_service: DS,
) -> Result<Self, sled::Error> {
let config = sled::Config::default().temporary(true);
let db = config.open()?;
Ok(Self {
db,
blob_service,
directory_service,
})
}
}
impl<DS: DirectoryService + Clone> PathInfoService for SledPathInfoService<DS> {
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,
self.directory_service.clone(),
)
.map_err(|e| Error::StorageError(e.to_string()))
}
}
|
