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//! An indexed, on-disk store for chunks on the server.
use crate::chunk::{DataChunk, GenerationChunkError};
use crate::chunkid::ChunkId;
use crate::chunkmeta::ChunkMeta;
use crate::index::{Index, IndexError};
use crate::store::{Store, StoreError};
use std::path::Path;
/// A store for chunks and their metadata.
///
/// This combines Store and Index into one interface to make it easier
/// to handle the server side storage of chunks.
pub struct IndexedStore {
store: Store,
index: Index,
}
/// All the errors that may be returned for `IndexStore`.
#[derive(Debug, thiserror::Error)]
pub enum IndexedError {
/// An error from Index.
#[error(transparent)]
IndexError(#[from] IndexError),
/// Error regarding generation chunks.
#[error(transparent)]
GenerationChunkError(#[from] GenerationChunkError),
/// An error from Store.
#[error(transparent)]
SqlError(#[from] StoreError),
}
impl IndexedStore {
/// Create a new indexed store.
pub fn new(dirname: &Path) -> Result<Self, IndexedError> {
let store = Store::new(dirname);
let index = Index::new(dirname)?;
Ok(Self { store, index })
}
/// Save a chunk in the store.
pub fn save(&mut self, chunk: &DataChunk) -> Result<ChunkId, IndexedError> {
let id = ChunkId::new();
self.store.save(&id, chunk)?;
self.insert_meta(&id, chunk.meta())?;
Ok(id)
}
fn insert_meta(&mut self, id: &ChunkId, meta: &ChunkMeta) -> Result<(), IndexedError> {
self.index.insert_meta(id.clone(), meta.clone())?;
Ok(())
}
/// Get a chunk from the store, given its id.
pub fn load(&self, id: &ChunkId) -> Result<(DataChunk, ChunkMeta), IndexedError> {
Ok((self.store.load(id)?, self.load_meta(id)?))
}
/// Get a chunk's metadata form the store, given its id.
pub fn load_meta(&self, id: &ChunkId) -> Result<ChunkMeta, IndexedError> {
Ok(self.index.get_meta(id)?)
}
/// Find chunks with a client-assigned label.
pub fn find_by_label(&self, label: &str) -> Result<Vec<ChunkId>, IndexedError> {
Ok(self.index.find_by_label(label)?)
}
/// Find all generations.
pub fn find_generations(&self) -> Result<Vec<ChunkId>, IndexedError> {
Ok(self.index.find_generations()?)
}
/// Remove a chunk from the store.
pub fn remove(&mut self, id: &ChunkId) -> Result<(), IndexedError> {
self.index.remove_meta(id)?;
self.store.delete(id)?;
Ok(())
}
}
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