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|
use crate::{proto, Error};
use nix_compat::store_path::DIGEST_SIZE;
use prost::Message;
use std::path::PathBuf;
use tracing::warn;
use super::PathInfoService;
/// 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,
}
impl SledPathInfoService {
pub fn new(p: PathBuf) -> Result<Self, sled::Error> {
let config = sled::Config::default().use_compression(true).path(p);
let db = config.open()?;
Ok(Self { db })
}
pub fn new_temporary() -> Result<Self, sled::Error> {
let config = sled::Config::default().temporary(true);
let db = config.open()?;
Ok(Self { db })
}
}
impl PathInfoService for SledPathInfoService {
fn get(
&self,
by_what: proto::get_path_info_request::ByWhat,
) -> Result<Option<proto::PathInfo>, Error> {
match by_what {
proto::get_path_info_request::ByWhat::ByOutputHash(digest) => {
if digest.len() != DIGEST_SIZE {
return Err(Error::InvalidRequest("invalid digest length".to_string()));
}
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
}))
}
},
}
}
}
|
