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use crate::chunk::{DataChunk, GenerationChunk, GenerationChunkError};
use crate::chunkid::ChunkId;
use crate::chunkmeta::ChunkMeta;
use crate::index::{Index, IndexError};
use crate::store::{Store, StoreError};
use std::collections::HashSet;
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(transparent)]
GenerationChunkError(#[from] GenerationChunkError),
/// An error from Store.
#[error(transparent)]
SqlError(#[from] StoreError),
}
/// A result from an `Index` operation.
pub type IndexedResult<T> = Result<T, IndexedError>;
impl IndexedStore {
pub fn new(dirname: &Path) -> IndexedResult<Self> {
let store = Store::new(dirname);
let index = Index::new(dirname)?;
Ok(Self { store, index })
}
pub fn save(&mut self, meta: &ChunkMeta, chunk: &DataChunk) -> IndexedResult<ChunkId> {
let id = ChunkId::new();
self.store.save(&id, meta, chunk)?;
self.insert_meta(&id, meta)?;
Ok(id)
}
fn insert_meta(&mut self, id: &ChunkId, meta: &ChunkMeta) -> IndexedResult<()> {
self.index.insert_meta(id.clone(), meta.clone())?;
Ok(())
}
pub fn load(&self, id: &ChunkId) -> IndexedResult<(DataChunk, ChunkMeta)> {
Ok((self.store.load(id)?, self.load_meta(id)?))
}
pub fn load_meta(&self, id: &ChunkId) -> IndexedResult<ChunkMeta> {
Ok(self.index.get_meta(id)?)
}
pub fn find_by_sha256(&self, sha256: &str) -> IndexedResult<Vec<ChunkId>> {
Ok(self.index.find_by_sha256(sha256)?)
}
pub fn find_generations(&self) -> IndexedResult<Vec<ChunkId>> {
Ok(self.index.find_generations()?)
}
pub fn find_file_chunks(&self) -> IndexedResult<Vec<ChunkId>> {
let gen_ids = self.find_generations()?;
let mut sql_chunks: HashSet<ChunkId> = HashSet::new();
for id in gen_ids {
let gen_chunk = self.store.load(&id)?;
let gen = GenerationChunk::from_data_chunk(&gen_chunk)?;
for sqlite_chunk_id in gen.chunk_ids() {
sql_chunks.insert(sqlite_chunk_id.clone());
}
}
let all_chunk_ids = self.index.all_chunks()?;
let file_chunks = all_chunk_ids
.iter()
.filter(|id| !sql_chunks.contains(id))
.map(|id| id.clone())
.collect();
Ok(file_chunks)
}
pub fn remove(&mut self, id: &ChunkId) -> IndexedResult<()> {
self.index.remove_meta(id)?;
self.store.delete(id)?;
Ok(())
}
}
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